| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.net; |
| |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.util.Log; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.io.ByteArrayOutputStream; |
| import java.net.URLEncoder; |
| import java.util.AbstractList; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.RandomAccess; |
| |
| /** |
| * Immutable URI reference. A URI reference includes a URI and a fragment, the |
| * component of the URI following a '#'. Builds and parses URI references |
| * which conform to |
| * <a href="http://www.faqs.org/rfcs/rfc2396.html">RFC 2396</a>. |
| * |
| * <p>In the interest of performance, this class performs little to no |
| * validation. Behavior is undefined for invalid input. This class is very |
| * forgiving--in the face of invalid input, it will return garbage |
| * rather than throw an exception unless otherwise specified. |
| */ |
| public abstract class Uri implements Parcelable, Comparable<Uri> { |
| |
| /* |
| |
| This class aims to do as little up front work as possible. To accomplish |
| that, we vary the implementation dependending on what the user passes in. |
| For example, we have one implementation if the user passes in a |
| URI string (StringUri) and another if the user passes in the |
| individual components (OpaqueUri). |
| |
| *Concurrency notes*: Like any truly immutable object, this class is safe |
| for concurrent use. This class uses a caching pattern in some places where |
| it doesn't use volatile or synchronized. This is safe to do with ints |
| because getting or setting an int is atomic. It's safe to do with a String |
| because the internal fields are final and the memory model guarantees other |
| threads won't see a partially initialized instance. We are not guaranteed |
| that some threads will immediately see changes from other threads on |
| certain platforms, but we don't mind if those threads reconstruct the |
| cached result. As a result, we get thread safe caching with no concurrency |
| overhead, which means the most common case, access from a single thread, |
| is as fast as possible. |
| |
| From the Java Language spec.: |
| |
| "17.5 Final Field Semantics |
| |
| ... when the object is seen by another thread, that thread will always |
| see the correctly constructed version of that object's final fields. |
| It will also see versions of any object or array referenced by |
| those final fields that are at least as up-to-date as the final fields |
| are." |
| |
| In that same vein, all non-transient fields within Uri |
| implementations should be final and immutable so as to ensure true |
| immutability for clients even when they don't use proper concurrency |
| control. |
| |
| For reference, from RFC 2396: |
| |
| "4.3. Parsing a URI Reference |
| |
| A URI reference is typically parsed according to the four main |
| components and fragment identifier in order to determine what |
| components are present and whether the reference is relative or |
| absolute. The individual components are then parsed for their |
| subparts and, if not opaque, to verify their validity. |
| |
| Although the BNF defines what is allowed in each component, it is |
| ambiguous in terms of differentiating between an authority component |
| and a path component that begins with two slash characters. The |
| greedy algorithm is used for disambiguation: the left-most matching |
| rule soaks up as much of the URI reference string as it is capable of |
| matching. In other words, the authority component wins." |
| |
| The "four main components" of a hierarchical URI consist of |
| <scheme>://<authority><path>?<query> |
| |
| */ |
| |
| /** Log tag. */ |
| private static final String LOG = Uri.class.getSimpleName(); |
| |
| /** |
| * NOTE: EMPTY accesses this field during its own initialization, so this |
| * field *must* be initialized first, or else EMPTY will see a null value! |
| * |
| * Placeholder for strings which haven't been cached. This enables us |
| * to cache null. We intentionally create a new String instance so we can |
| * compare its identity and there is no chance we will confuse it with |
| * user data. |
| */ |
| @SuppressWarnings("RedundantStringConstructorCall") |
| private static final String NOT_CACHED = new String("NOT CACHED"); |
| |
| /** |
| * The empty URI, equivalent to "". |
| */ |
| public static final Uri EMPTY = new HierarchicalUri(null, Part.NULL, |
| PathPart.EMPTY, Part.NULL, Part.NULL); |
| |
| /** |
| * Prevents external subclassing. |
| */ |
| private Uri() {} |
| |
| /** |
| * Returns true if this URI is hierarchical like "http://google.com". |
| * Absolute URIs are hierarchical if the scheme-specific part starts with |
| * a '/'. Relative URIs are always hierarchical. |
| */ |
| public abstract boolean isHierarchical(); |
| |
| /** |
| * Returns true if this URI is opaque like "mailto:nobody@google.com". The |
| * scheme-specific part of an opaque URI cannot start with a '/'. |
| */ |
| public boolean isOpaque() { |
| return !isHierarchical(); |
| } |
| |
| /** |
| * Returns true if this URI is relative, i.e. if it doesn't contain an |
| * explicit scheme. |
| * |
| * @return true if this URI is relative, false if it's absolute |
| */ |
| public abstract boolean isRelative(); |
| |
| /** |
| * Returns true if this URI is absolute, i.e. if it contains an |
| * explicit scheme. |
| * |
| * @return true if this URI is absolute, false if it's relative |
| */ |
| public boolean isAbsolute() { |
| return !isRelative(); |
| } |
| |
| /** |
| * Gets the scheme of this URI. Example: "http" |
| * |
| * @return the scheme or null if this is a relative URI |
| */ |
| public abstract String getScheme(); |
| |
| /** |
| * Gets the scheme-specific part of this URI, i.e. everything between the |
| * scheme separator ':' and the fragment separator '#'. If this is a |
| * relative URI, this method returns the entire URI. Decodes escaped octets. |
| * |
| * <p>Example: "//www.google.com/search?q=android" |
| * |
| * @return the decoded scheme-specific-part |
| */ |
| public abstract String getSchemeSpecificPart(); |
| |
| /** |
| * Gets the scheme-specific part of this URI, i.e. everything between the |
| * scheme separator ':' and the fragment separator '#'. If this is a |
| * relative URI, this method returns the entire URI. Leaves escaped octets |
| * intact. |
| * |
| * <p>Example: "//www.google.com/search?q=android" |
| * |
| * @return the decoded scheme-specific-part |
| */ |
| public abstract String getEncodedSchemeSpecificPart(); |
| |
| /** |
| * Gets the decoded authority part of this URI. For |
| * server addresses, the authority is structured as follows: |
| * {@code [ userinfo '@' ] host [ ':' port ]} |
| * |
| * <p>Examples: "google.com", "bob@google.com:80" |
| * |
| * @return the authority for this URI or null if not present |
| */ |
| public abstract String getAuthority(); |
| |
| /** |
| * Gets the encoded authority part of this URI. For |
| * server addresses, the authority is structured as follows: |
| * {@code [ userinfo '@' ] host [ ':' port ]} |
| * |
| * <p>Examples: "google.com", "bob@google.com:80" |
| * |
| * @return the authority for this URI or null if not present |
| */ |
| public abstract String getEncodedAuthority(); |
| |
| /** |
| * Gets the decoded user information from the authority. |
| * For example, if the authority is "nobody@google.com", this method will |
| * return "nobody". |
| * |
| * @return the user info for this URI or null if not present |
| */ |
| public abstract String getUserInfo(); |
| |
| /** |
| * Gets the encoded user information from the authority. |
| * For example, if the authority is "nobody@google.com", this method will |
| * return "nobody". |
| * |
| * @return the user info for this URI or null if not present |
| */ |
| public abstract String getEncodedUserInfo(); |
| |
| /** |
| * Gets the encoded host from the authority for this URI. For example, |
| * if the authority is "bob@google.com", this method will return |
| * "google.com". |
| * |
| * @return the host for this URI or null if not present |
| */ |
| public abstract String getHost(); |
| |
| /** |
| * Gets the port from the authority for this URI. For example, |
| * if the authority is "google.com:80", this method will return 80. |
| * |
| * @return the port for this URI or -1 if invalid or not present |
| */ |
| public abstract int getPort(); |
| |
| /** |
| * Gets the decoded path. |
| * |
| * @return the decoded path, or null if this is not a hierarchical URI |
| * (like "mailto:nobody@google.com") or the URI is invalid |
| */ |
| public abstract String getPath(); |
| |
| /** |
| * Gets the encoded path. |
| * |
| * @return the encoded path, or null if this is not a hierarchical URI |
| * (like "mailto:nobody@google.com") or the URI is invalid |
| */ |
| public abstract String getEncodedPath(); |
| |
| /** |
| * Gets the decoded query component from this URI. The query comes after |
| * the query separator ('?') and before the fragment separator ('#'). This |
| * method would return "q=android" for |
| * "http://www.google.com/search?q=android". |
| * |
| * @return the decoded query or null if there isn't one |
| */ |
| public abstract String getQuery(); |
| |
| /** |
| * Gets the encoded query component from this URI. The query comes after |
| * the query separator ('?') and before the fragment separator ('#'). This |
| * method would return "q=android" for |
| * "http://www.google.com/search?q=android". |
| * |
| * @return the encoded query or null if there isn't one |
| */ |
| public abstract String getEncodedQuery(); |
| |
| /** |
| * Gets the decoded fragment part of this URI, everything after the '#'. |
| * |
| * @return the decoded fragment or null if there isn't one |
| */ |
| public abstract String getFragment(); |
| |
| /** |
| * Gets the encoded fragment part of this URI, everything after the '#'. |
| * |
| * @return the encoded fragment or null if there isn't one |
| */ |
| public abstract String getEncodedFragment(); |
| |
| /** |
| * Gets the decoded path segments. |
| * |
| * @return decoded path segments, each without a leading or trailing '/' |
| */ |
| public abstract List<String> getPathSegments(); |
| |
| /** |
| * Gets the decoded last segment in the path. |
| * |
| * @return the decoded last segment or null if the path is empty |
| */ |
| public abstract String getLastPathSegment(); |
| |
| /** |
| * Compares this Uri to another object for equality. Returns true if the |
| * encoded string representations of this Uri and the given Uri are |
| * equal. Case counts. Paths are not normalized. If one Uri specifies a |
| * default port explicitly and the other leaves it implicit, they will not |
| * be considered equal. |
| */ |
| public boolean equals(Object o) { |
| if (!(o instanceof Uri)) { |
| return false; |
| } |
| |
| Uri other = (Uri) o; |
| |
| return toString().equals(other.toString()); |
| } |
| |
| /** |
| * Hashes the encoded string represention of this Uri consistently with |
| * {@link #equals(Object)}. |
| */ |
| public int hashCode() { |
| return toString().hashCode(); |
| } |
| |
| /** |
| * Compares the string representation of this Uri with that of |
| * another. |
| */ |
| public int compareTo(Uri other) { |
| return toString().compareTo(other.toString()); |
| } |
| |
| /** |
| * Returns the encoded string representation of this URI. |
| * Example: "http://google.com/" |
| */ |
| public abstract String toString(); |
| |
| /** |
| * Constructs a new builder, copying the attributes from this Uri. |
| */ |
| public abstract Builder buildUpon(); |
| |
| /** Index of a component which was not found. */ |
| private final static int NOT_FOUND = -1; |
| |
| /** Placeholder value for an index which hasn't been calculated yet. */ |
| private final static int NOT_CALCULATED = -2; |
| |
| /** |
| * Error message presented when a user tries to treat an opaque URI as |
| * hierarchical. |
| */ |
| private static final String NOT_HIERARCHICAL |
| = "This isn't a hierarchical URI."; |
| |
| /** Default encoding. */ |
| private static final String DEFAULT_ENCODING = "UTF-8"; |
| |
| /** |
| * Creates a Uri which parses the given encoded URI string. |
| * |
| * @param uriString an RFC 2396-compliant, encoded URI |
| * @throws NullPointerException if uriString is null |
| * @return Uri for this given uri string |
| */ |
| public static Uri parse(String uriString) { |
| return new StringUri(uriString); |
| } |
| |
| /** |
| * Creates a Uri from a file. The URI has the form |
| * "file://<absolute path>". Encodes path characters with the exception of |
| * '/'. |
| * |
| * <p>Example: "file:///tmp/android.txt" |
| * |
| * @throws NullPointerException if file is null |
| * @return a Uri for the given file |
| */ |
| public static Uri fromFile(File file) { |
| if (file == null) { |
| throw new NullPointerException("file"); |
| } |
| |
| PathPart path = PathPart.fromDecoded(file.getAbsolutePath()); |
| return new HierarchicalUri( |
| "file", Part.EMPTY, path, Part.NULL, Part.NULL); |
| } |
| |
| /** |
| * An implementation which wraps a String URI. This URI can be opaque or |
| * hierarchical, but we extend AbstractHierarchicalUri in case we need |
| * the hierarchical functionality. |
| */ |
| private static class StringUri extends AbstractHierarchicalUri { |
| |
| /** Used in parcelling. */ |
| static final int TYPE_ID = 1; |
| |
| /** URI string representation. */ |
| private final String uriString; |
| |
| private StringUri(String uriString) { |
| if (uriString == null) { |
| throw new NullPointerException("uriString"); |
| } |
| |
| this.uriString = uriString; |
| } |
| |
| static Uri readFrom(Parcel parcel) { |
| return new StringUri(parcel.readString()); |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel parcel, int flags) { |
| parcel.writeInt(TYPE_ID); |
| parcel.writeString(uriString); |
| } |
| |
| /** Cached scheme separator index. */ |
| private volatile int cachedSsi = NOT_CALCULATED; |
| |
| /** Finds the first ':'. Returns -1 if none found. */ |
| private int findSchemeSeparator() { |
| return cachedSsi == NOT_CALCULATED |
| ? cachedSsi = uriString.indexOf(':') |
| : cachedSsi; |
| } |
| |
| /** Cached fragment separator index. */ |
| private volatile int cachedFsi = NOT_CALCULATED; |
| |
| /** Finds the first '#'. Returns -1 if none found. */ |
| private int findFragmentSeparator() { |
| return cachedFsi == NOT_CALCULATED |
| ? cachedFsi = uriString.indexOf('#', findSchemeSeparator()) |
| : cachedFsi; |
| } |
| |
| public boolean isHierarchical() { |
| int ssi = findSchemeSeparator(); |
| |
| if (ssi == NOT_FOUND) { |
| // All relative URIs are hierarchical. |
| return true; |
| } |
| |
| if (uriString.length() == ssi + 1) { |
| // No ssp. |
| return false; |
| } |
| |
| // If the ssp starts with a '/', this is hierarchical. |
| return uriString.charAt(ssi + 1) == '/'; |
| } |
| |
| public boolean isRelative() { |
| // Note: We return true if the index is 0 |
| return findSchemeSeparator() == NOT_FOUND; |
| } |
| |
| private volatile String scheme = NOT_CACHED; |
| |
| public String getScheme() { |
| @SuppressWarnings("StringEquality") |
| boolean cached = (scheme != NOT_CACHED); |
| return cached ? scheme : (scheme = parseScheme()); |
| } |
| |
| private String parseScheme() { |
| int ssi = findSchemeSeparator(); |
| return ssi == NOT_FOUND ? null : uriString.substring(0, ssi); |
| } |
| |
| private Part ssp; |
| |
| private Part getSsp() { |
| return ssp == null ? ssp = Part.fromEncoded(parseSsp()) : ssp; |
| } |
| |
| public String getEncodedSchemeSpecificPart() { |
| return getSsp().getEncoded(); |
| } |
| |
| public String getSchemeSpecificPart() { |
| return getSsp().getDecoded(); |
| } |
| |
| private String parseSsp() { |
| int ssi = findSchemeSeparator(); |
| int fsi = findFragmentSeparator(); |
| |
| // Return everything between ssi and fsi. |
| return fsi == NOT_FOUND |
| ? uriString.substring(ssi + 1) |
| : uriString.substring(ssi + 1, fsi); |
| } |
| |
| private Part authority; |
| |
| private Part getAuthorityPart() { |
| if (authority == null) { |
| String encodedAuthority |
| = parseAuthority(this.uriString, findSchemeSeparator()); |
| return authority = Part.fromEncoded(encodedAuthority); |
| } |
| |
| return authority; |
| } |
| |
| public String getEncodedAuthority() { |
| return getAuthorityPart().getEncoded(); |
| } |
| |
| public String getAuthority() { |
| return getAuthorityPart().getDecoded(); |
| } |
| |
| private PathPart path; |
| |
| private PathPart getPathPart() { |
| return path == null |
| ? path = PathPart.fromEncoded(parsePath()) |
| : path; |
| } |
| |
| public String getPath() { |
| return getPathPart().getDecoded(); |
| } |
| |
| public String getEncodedPath() { |
| return getPathPart().getEncoded(); |
| } |
| |
| public List<String> getPathSegments() { |
| return getPathPart().getPathSegments(); |
| } |
| |
| private String parsePath() { |
| String uriString = this.uriString; |
| int ssi = findSchemeSeparator(); |
| |
| // If the URI is absolute. |
| if (ssi > -1) { |
| // Is there anything after the ':'? |
| boolean schemeOnly = ssi + 1 == uriString.length(); |
| if (schemeOnly) { |
| // Opaque URI. |
| return null; |
| } |
| |
| // A '/' after the ':' means this is hierarchical. |
| if (uriString.charAt(ssi + 1) != '/') { |
| // Opaque URI. |
| return null; |
| } |
| } else { |
| // All relative URIs are hierarchical. |
| } |
| |
| return parsePath(uriString, ssi); |
| } |
| |
| private Part query; |
| |
| private Part getQueryPart() { |
| return query == null |
| ? query = Part.fromEncoded(parseQuery()) : query; |
| } |
| |
| public String getEncodedQuery() { |
| return getQueryPart().getEncoded(); |
| } |
| |
| private String parseQuery() { |
| // It doesn't make sense to cache this index. We only ever |
| // calculate it once. |
| int qsi = uriString.indexOf('?', findSchemeSeparator()); |
| if (qsi == NOT_FOUND) { |
| return null; |
| } |
| |
| int fsi = findFragmentSeparator(); |
| |
| if (fsi == NOT_FOUND) { |
| return uriString.substring(qsi + 1); |
| } |
| |
| if (fsi < qsi) { |
| // Invalid. |
| return null; |
| } |
| |
| return uriString.substring(qsi + 1, fsi); |
| } |
| |
| public String getQuery() { |
| return getQueryPart().getDecoded(); |
| } |
| |
| private Part fragment; |
| |
| private Part getFragmentPart() { |
| return fragment == null |
| ? fragment = Part.fromEncoded(parseFragment()) : fragment; |
| } |
| |
| public String getEncodedFragment() { |
| return getFragmentPart().getEncoded(); |
| } |
| |
| private String parseFragment() { |
| int fsi = findFragmentSeparator(); |
| return fsi == NOT_FOUND ? null : uriString.substring(fsi + 1); |
| } |
| |
| public String getFragment() { |
| return getFragmentPart().getDecoded(); |
| } |
| |
| public String toString() { |
| return uriString; |
| } |
| |
| /** |
| * Parses an authority out of the given URI string. |
| * |
| * @param uriString URI string |
| * @param ssi scheme separator index, -1 for a relative URI |
| * |
| * @return the authority or null if none is found |
| */ |
| static String parseAuthority(String uriString, int ssi) { |
| int length = uriString.length(); |
| |
| // If "//" follows the scheme separator, we have an authority. |
| if (length > ssi + 2 |
| && uriString.charAt(ssi + 1) == '/' |
| && uriString.charAt(ssi + 2) == '/') { |
| // We have an authority. |
| |
| // Look for the start of the path, query, or fragment, or the |
| // end of the string. |
| int end = ssi + 3; |
| LOOP: while (end < length) { |
| switch (uriString.charAt(end)) { |
| case '/': // Start of path |
| case '?': // Start of query |
| case '#': // Start of fragment |
| break LOOP; |
| } |
| end++; |
| } |
| |
| return uriString.substring(ssi + 3, end); |
| } else { |
| return null; |
| } |
| |
| } |
| |
| /** |
| * Parses a path out of this given URI string. |
| * |
| * @param uriString URI string |
| * @param ssi scheme separator index, -1 for a relative URI |
| * |
| * @return the path |
| */ |
| static String parsePath(String uriString, int ssi) { |
| int length = uriString.length(); |
| |
| // Find start of path. |
| int pathStart; |
| if (length > ssi + 2 |
| && uriString.charAt(ssi + 1) == '/' |
| && uriString.charAt(ssi + 2) == '/') { |
| // Skip over authority to path. |
| pathStart = ssi + 3; |
| LOOP: while (pathStart < length) { |
| switch (uriString.charAt(pathStart)) { |
| case '?': // Start of query |
| case '#': // Start of fragment |
| return ""; // Empty path. |
| case '/': // Start of path! |
| break LOOP; |
| } |
| pathStart++; |
| } |
| } else { |
| // Path starts immediately after scheme separator. |
| pathStart = ssi + 1; |
| } |
| |
| // Find end of path. |
| int pathEnd = pathStart; |
| LOOP: while (pathEnd < length) { |
| switch (uriString.charAt(pathEnd)) { |
| case '?': // Start of query |
| case '#': // Start of fragment |
| break LOOP; |
| } |
| pathEnd++; |
| } |
| |
| return uriString.substring(pathStart, pathEnd); |
| } |
| |
| public Builder buildUpon() { |
| if (isHierarchical()) { |
| return new Builder() |
| .scheme(getScheme()) |
| .authority(getAuthorityPart()) |
| .path(getPathPart()) |
| .query(getQueryPart()) |
| .fragment(getFragmentPart()); |
| } else { |
| return new Builder() |
| .scheme(getScheme()) |
| .opaquePart(getSsp()) |
| .fragment(getFragmentPart()); |
| } |
| } |
| } |
| |
| /** |
| * Creates an opaque Uri from the given components. Encodes the ssp |
| * which means this method cannot be used to create hierarchical URIs. |
| * |
| * @param scheme of the URI |
| * @param ssp scheme-specific-part, everything between the |
| * scheme separator (':') and the fragment separator ('#'), which will |
| * get encoded |
| * @param fragment fragment, everything after the '#', null if undefined, |
| * will get encoded |
| * |
| * @throws NullPointerException if scheme or ssp is null |
| * @return Uri composed of the given scheme, ssp, and fragment |
| * |
| * @see Builder if you don't want the ssp and fragment to be encoded |
| */ |
| public static Uri fromParts(String scheme, String ssp, |
| String fragment) { |
| if (scheme == null) { |
| throw new NullPointerException("scheme"); |
| } |
| if (ssp == null) { |
| throw new NullPointerException("ssp"); |
| } |
| |
| return new OpaqueUri(scheme, Part.fromDecoded(ssp), |
| Part.fromDecoded(fragment)); |
| } |
| |
| /** |
| * Opaque URI. |
| */ |
| private static class OpaqueUri extends Uri { |
| |
| /** Used in parcelling. */ |
| static final int TYPE_ID = 2; |
| |
| private final String scheme; |
| private final Part ssp; |
| private final Part fragment; |
| |
| private OpaqueUri(String scheme, Part ssp, Part fragment) { |
| this.scheme = scheme; |
| this.ssp = ssp; |
| this.fragment = fragment == null ? Part.NULL : fragment; |
| } |
| |
| static Uri readFrom(Parcel parcel) { |
| return new OpaqueUri( |
| parcel.readString(), |
| Part.readFrom(parcel), |
| Part.readFrom(parcel) |
| ); |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel parcel, int flags) { |
| parcel.writeInt(TYPE_ID); |
| parcel.writeString(scheme); |
| ssp.writeTo(parcel); |
| fragment.writeTo(parcel); |
| } |
| |
| public boolean isHierarchical() { |
| return false; |
| } |
| |
| public boolean isRelative() { |
| return scheme == null; |
| } |
| |
| public String getScheme() { |
| return this.scheme; |
| } |
| |
| public String getEncodedSchemeSpecificPart() { |
| return ssp.getEncoded(); |
| } |
| |
| public String getSchemeSpecificPart() { |
| return ssp.getDecoded(); |
| } |
| |
| public String getAuthority() { |
| return null; |
| } |
| |
| public String getEncodedAuthority() { |
| return null; |
| } |
| |
| public String getPath() { |
| return null; |
| } |
| |
| public String getEncodedPath() { |
| return null; |
| } |
| |
| public String getQuery() { |
| return null; |
| } |
| |
| public String getEncodedQuery() { |
| return null; |
| } |
| |
| public String getFragment() { |
| return fragment.getDecoded(); |
| } |
| |
| public String getEncodedFragment() { |
| return fragment.getEncoded(); |
| } |
| |
| public List<String> getPathSegments() { |
| return Collections.emptyList(); |
| } |
| |
| public String getLastPathSegment() { |
| return null; |
| } |
| |
| public String getUserInfo() { |
| return null; |
| } |
| |
| public String getEncodedUserInfo() { |
| return null; |
| } |
| |
| public String getHost() { |
| return null; |
| } |
| |
| public int getPort() { |
| return -1; |
| } |
| |
| private volatile String cachedString = NOT_CACHED; |
| |
| public String toString() { |
| @SuppressWarnings("StringEquality") |
| boolean cached = cachedString != NOT_CACHED; |
| if (cached) { |
| return cachedString; |
| } |
| |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append(scheme).append(':'); |
| sb.append(getEncodedSchemeSpecificPart()); |
| |
| if (!fragment.isEmpty()) { |
| sb.append('#').append(fragment.getEncoded()); |
| } |
| |
| return cachedString = sb.toString(); |
| } |
| |
| public Builder buildUpon() { |
| return new Builder() |
| .scheme(this.scheme) |
| .opaquePart(this.ssp) |
| .fragment(this.fragment); |
| } |
| } |
| |
| /** |
| * Wrapper for path segment array. |
| */ |
| static class PathSegments extends AbstractList<String> |
| implements RandomAccess { |
| |
| static final PathSegments EMPTY = new PathSegments(null, 0); |
| |
| final String[] segments; |
| final int size; |
| |
| PathSegments(String[] segments, int size) { |
| this.segments = segments; |
| this.size = size; |
| } |
| |
| public String get(int index) { |
| if (index >= size) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| return segments[index]; |
| } |
| |
| public int size() { |
| return this.size; |
| } |
| } |
| |
| /** |
| * Builds PathSegments. |
| */ |
| static class PathSegmentsBuilder { |
| |
| String[] segments; |
| int size = 0; |
| |
| void add(String segment) { |
| if (segments == null) { |
| segments = new String[4]; |
| } else if (size + 1 == segments.length) { |
| String[] expanded = new String[segments.length * 2]; |
| System.arraycopy(segments, 0, expanded, 0, segments.length); |
| segments = expanded; |
| } |
| |
| segments[size++] = segment; |
| } |
| |
| PathSegments build() { |
| if (segments == null) { |
| return PathSegments.EMPTY; |
| } |
| |
| try { |
| return new PathSegments(segments, size); |
| } finally { |
| // Makes sure this doesn't get reused. |
| segments = null; |
| } |
| } |
| } |
| |
| /** |
| * Support for hierarchical URIs. |
| */ |
| private abstract static class AbstractHierarchicalUri extends Uri { |
| |
| public String getLastPathSegment() { |
| // TODO: If we haven't parsed all of the segments already, just |
| // grab the last one directly so we only allocate one string. |
| |
| List<String> segments = getPathSegments(); |
| int size = segments.size(); |
| if (size == 0) { |
| return null; |
| } |
| return segments.get(size - 1); |
| } |
| |
| private Part userInfo; |
| |
| private Part getUserInfoPart() { |
| return userInfo == null |
| ? userInfo = Part.fromEncoded(parseUserInfo()) : userInfo; |
| } |
| |
| public final String getEncodedUserInfo() { |
| return getUserInfoPart().getEncoded(); |
| } |
| |
| private String parseUserInfo() { |
| String authority = getEncodedAuthority(); |
| if (authority == null) { |
| return null; |
| } |
| |
| int end = authority.indexOf('@'); |
| return end == NOT_FOUND ? null : authority.substring(0, end); |
| } |
| |
| public String getUserInfo() { |
| return getUserInfoPart().getDecoded(); |
| } |
| |
| private volatile String host = NOT_CACHED; |
| |
| public String getHost() { |
| @SuppressWarnings("StringEquality") |
| boolean cached = (host != NOT_CACHED); |
| return cached ? host |
| : (host = parseHost()); |
| } |
| |
| private String parseHost() { |
| String authority = getAuthority(); |
| if (authority == null) { |
| return null; |
| } |
| |
| // Parse out user info and then port. |
| int userInfoSeparator = authority.indexOf('@'); |
| int portSeparator = authority.indexOf(':', userInfoSeparator); |
| |
| return portSeparator == NOT_FOUND |
| ? authority.substring(userInfoSeparator + 1) |
| : authority.substring(userInfoSeparator + 1, portSeparator); |
| } |
| |
| private volatile int port = NOT_CALCULATED; |
| |
| public int getPort() { |
| return port == NOT_CALCULATED |
| ? port = parsePort() |
| : port; |
| } |
| |
| private int parsePort() { |
| String authority = getAuthority(); |
| if (authority == null) { |
| return -1; |
| } |
| |
| // Make sure we look for the port separtor *after* the user info |
| // separator. We have URLs with a ':' in the user info. |
| int userInfoSeparator = authority.indexOf('@'); |
| int portSeparator = authority.indexOf(':', userInfoSeparator); |
| |
| if (portSeparator == NOT_FOUND) { |
| return -1; |
| } |
| |
| String portString = authority.substring(portSeparator + 1); |
| try { |
| return Integer.parseInt(portString); |
| } catch (NumberFormatException e) { |
| Log.w(LOG, "Error parsing port string.", e); |
| return -1; |
| } |
| } |
| } |
| |
| /** |
| * Hierarchical Uri. |
| */ |
| private static class HierarchicalUri extends AbstractHierarchicalUri { |
| |
| /** Used in parcelling. */ |
| static final int TYPE_ID = 3; |
| |
| private final String scheme; // can be null |
| private final Part authority; |
| private final PathPart path; |
| private final Part query; |
| private final Part fragment; |
| |
| private HierarchicalUri(String scheme, Part authority, PathPart path, |
| Part query, Part fragment) { |
| this.scheme = scheme; |
| this.authority = Part.nonNull(authority); |
| this.path = path == null ? PathPart.NULL : path; |
| this.query = Part.nonNull(query); |
| this.fragment = Part.nonNull(fragment); |
| } |
| |
| static Uri readFrom(Parcel parcel) { |
| return new HierarchicalUri( |
| parcel.readString(), |
| Part.readFrom(parcel), |
| PathPart.readFrom(parcel), |
| Part.readFrom(parcel), |
| Part.readFrom(parcel) |
| ); |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel parcel, int flags) { |
| parcel.writeInt(TYPE_ID); |
| parcel.writeString(scheme); |
| authority.writeTo(parcel); |
| path.writeTo(parcel); |
| query.writeTo(parcel); |
| fragment.writeTo(parcel); |
| } |
| |
| public boolean isHierarchical() { |
| return true; |
| } |
| |
| public boolean isRelative() { |
| return scheme == null; |
| } |
| |
| public String getScheme() { |
| return scheme; |
| } |
| |
| private Part ssp; |
| |
| private Part getSsp() { |
| return ssp == null |
| ? ssp = Part.fromEncoded(makeSchemeSpecificPart()) : ssp; |
| } |
| |
| public String getEncodedSchemeSpecificPart() { |
| return getSsp().getEncoded(); |
| } |
| |
| public String getSchemeSpecificPart() { |
| return getSsp().getDecoded(); |
| } |
| |
| /** |
| * Creates the encoded scheme-specific part from its sub parts. |
| */ |
| private String makeSchemeSpecificPart() { |
| StringBuilder builder = new StringBuilder(); |
| appendSspTo(builder); |
| return builder.toString(); |
| } |
| |
| private void appendSspTo(StringBuilder builder) { |
| String encodedAuthority = authority.getEncoded(); |
| if (encodedAuthority != null) { |
| // Even if the authority is "", we still want to append "//". |
| builder.append("//").append(encodedAuthority); |
| } |
| |
| String encodedPath = path.getEncoded(); |
| if (encodedPath != null) { |
| builder.append(encodedPath); |
| } |
| |
| if (!query.isEmpty()) { |
| builder.append('?').append(query.getEncoded()); |
| } |
| } |
| |
| public String getAuthority() { |
| return this.authority.getDecoded(); |
| } |
| |
| public String getEncodedAuthority() { |
| return this.authority.getEncoded(); |
| } |
| |
| public String getEncodedPath() { |
| return this.path.getEncoded(); |
| } |
| |
| public String getPath() { |
| return this.path.getDecoded(); |
| } |
| |
| public String getQuery() { |
| return this.query.getDecoded(); |
| } |
| |
| public String getEncodedQuery() { |
| return this.query.getEncoded(); |
| } |
| |
| public String getFragment() { |
| return this.fragment.getDecoded(); |
| } |
| |
| public String getEncodedFragment() { |
| return this.fragment.getEncoded(); |
| } |
| |
| public List<String> getPathSegments() { |
| return this.path.getPathSegments(); |
| } |
| |
| private volatile String uriString = NOT_CACHED; |
| |
| @Override |
| public String toString() { |
| @SuppressWarnings("StringEquality") |
| boolean cached = (uriString != NOT_CACHED); |
| return cached ? uriString |
| : (uriString = makeUriString()); |
| } |
| |
| private String makeUriString() { |
| StringBuilder builder = new StringBuilder(); |
| |
| if (scheme != null) { |
| builder.append(scheme).append(':'); |
| } |
| |
| appendSspTo(builder); |
| |
| if (!fragment.isEmpty()) { |
| builder.append('#').append(fragment.getEncoded()); |
| } |
| |
| return builder.toString(); |
| } |
| |
| public Builder buildUpon() { |
| return new Builder() |
| .scheme(scheme) |
| .authority(authority) |
| .path(path) |
| .query(query) |
| .fragment(fragment); |
| } |
| } |
| |
| /** |
| * Helper class for building or manipulating URI references. Not safe for |
| * concurrent use. |
| * |
| * <p>An absolute hierarchical URI reference follows the pattern: |
| * {@code <scheme>://<authority><absolute path>?<query>#<fragment>} |
| * |
| * <p>Relative URI references (which are always hierarchical) follow one |
| * of two patterns: {@code <relative or absolute path>?<query>#<fragment>} |
| * or {@code //<authority><absolute path>?<query>#<fragment>} |
| * |
| * <p>An opaque URI follows this pattern: |
| * {@code <scheme>:<opaque part>#<fragment>} |
| */ |
| public static final class Builder { |
| |
| private String scheme; |
| private Part opaquePart; |
| private Part authority; |
| private PathPart path; |
| private Part query; |
| private Part fragment; |
| |
| /** |
| * Constructs a new Builder. |
| */ |
| public Builder() {} |
| |
| /** |
| * Sets the scheme. |
| * |
| * @param scheme name or {@code null} if this is a relative Uri |
| */ |
| public Builder scheme(String scheme) { |
| this.scheme = scheme; |
| return this; |
| } |
| |
| Builder opaquePart(Part opaquePart) { |
| this.opaquePart = opaquePart; |
| return this; |
| } |
| |
| /** |
| * Encodes and sets the given opaque scheme-specific-part. |
| * |
| * @param opaquePart decoded opaque part |
| */ |
| public Builder opaquePart(String opaquePart) { |
| return opaquePart(Part.fromDecoded(opaquePart)); |
| } |
| |
| /** |
| * Sets the previously encoded opaque scheme-specific-part. |
| * |
| * @param opaquePart encoded opaque part |
| */ |
| public Builder encodedOpaquePart(String opaquePart) { |
| return opaquePart(Part.fromEncoded(opaquePart)); |
| } |
| |
| Builder authority(Part authority) { |
| // This URI will be hierarchical. |
| this.opaquePart = null; |
| |
| this.authority = authority; |
| return this; |
| } |
| |
| /** |
| * Encodes and sets the authority. |
| */ |
| public Builder authority(String authority) { |
| return authority(Part.fromDecoded(authority)); |
| } |
| |
| /** |
| * Sets the previously encoded authority. |
| */ |
| public Builder encodedAuthority(String authority) { |
| return authority(Part.fromEncoded(authority)); |
| } |
| |
| Builder path(PathPart path) { |
| // This URI will be hierarchical. |
| this.opaquePart = null; |
| |
| this.path = path; |
| return this; |
| } |
| |
| /** |
| * Sets the path. Leaves '/' characters intact but encodes others as |
| * necessary. |
| * |
| * <p>If the path is not null and doesn't start with a '/', and if |
| * you specify a scheme and/or authority, the builder will prepend the |
| * given path with a '/'. |
| */ |
| public Builder path(String path) { |
| return path(PathPart.fromDecoded(path)); |
| } |
| |
| /** |
| * Sets the previously encoded path. |
| * |
| * <p>If the path is not null and doesn't start with a '/', and if |
| * you specify a scheme and/or authority, the builder will prepend the |
| * given path with a '/'. |
| */ |
| public Builder encodedPath(String path) { |
| return path(PathPart.fromEncoded(path)); |
| } |
| |
| /** |
| * Encodes the given segment and appends it to the path. |
| */ |
| public Builder appendPath(String newSegment) { |
| return path(PathPart.appendDecodedSegment(path, newSegment)); |
| } |
| |
| /** |
| * Appends the given segment to the path. |
| */ |
| public Builder appendEncodedPath(String newSegment) { |
| return path(PathPart.appendEncodedSegment(path, newSegment)); |
| } |
| |
| Builder query(Part query) { |
| // This URI will be hierarchical. |
| this.opaquePart = null; |
| |
| this.query = query; |
| return this; |
| } |
| |
| /** |
| * Encodes and sets the query. |
| */ |
| public Builder query(String query) { |
| return query(Part.fromDecoded(query)); |
| } |
| |
| /** |
| * Sets the previously encoded query. |
| */ |
| public Builder encodedQuery(String query) { |
| return query(Part.fromEncoded(query)); |
| } |
| |
| Builder fragment(Part fragment) { |
| this.fragment = fragment; |
| return this; |
| } |
| |
| /** |
| * Encodes and sets the fragment. |
| */ |
| public Builder fragment(String fragment) { |
| return fragment(Part.fromDecoded(fragment)); |
| } |
| |
| /** |
| * Sets the previously encoded fragment. |
| */ |
| public Builder encodedFragment(String fragment) { |
| return fragment(Part.fromEncoded(fragment)); |
| } |
| |
| /** |
| * Encodes the key and value and then appends the parameter to the |
| * query string. |
| * |
| * @param key which will be encoded |
| * @param value which will be encoded |
| */ |
| public Builder appendQueryParameter(String key, String value) { |
| // This URI will be hierarchical. |
| this.opaquePart = null; |
| |
| String encodedParameter = encode(key, null) + "=" |
| + encode(value, null); |
| |
| if (query == null) { |
| query = Part.fromEncoded(encodedParameter); |
| return this; |
| } |
| |
| String oldQuery = query.getEncoded(); |
| if (oldQuery == null || oldQuery.length() == 0) { |
| query = Part.fromEncoded(encodedParameter); |
| } else { |
| query = Part.fromEncoded(oldQuery + "&" + encodedParameter); |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Constructs a Uri with the current attributes. |
| * |
| * @throws UnsupportedOperationException if the URI is opaque and the |
| * scheme is null |
| */ |
| public Uri build() { |
| if (opaquePart != null) { |
| if (this.scheme == null) { |
| throw new UnsupportedOperationException( |
| "An opaque URI must have a scheme."); |
| } |
| |
| return new OpaqueUri(scheme, opaquePart, fragment); |
| } else { |
| // Hierarchical URIs should not return null for getPath(). |
| PathPart path = this.path; |
| if (path == null || path == PathPart.NULL) { |
| path = PathPart.EMPTY; |
| } else { |
| // If we have a scheme and/or authority, the path must |
| // be absolute. Prepend it with a '/' if necessary. |
| if (hasSchemeOrAuthority()) { |
| path = PathPart.makeAbsolute(path); |
| } |
| } |
| |
| return new HierarchicalUri( |
| scheme, authority, path, query, fragment); |
| } |
| } |
| |
| private boolean hasSchemeOrAuthority() { |
| return scheme != null |
| || (authority != null && authority != Part.NULL); |
| |
| } |
| |
| @Override |
| public String toString() { |
| return build().toString(); |
| } |
| } |
| |
| /** |
| * Searches the query string for parameter values with the given key. |
| * |
| * @param key which will be encoded |
| * |
| * @throws UnsupportedOperationException if this isn't a hierarchical URI |
| * @throws NullPointerException if key is null |
| * |
| * @return a list of decoded values |
| */ |
| public List<String> getQueryParameters(String key) { |
| if (isOpaque()) { |
| throw new UnsupportedOperationException(NOT_HIERARCHICAL); |
| } |
| |
| String query = getEncodedQuery(); |
| if (query == null) { |
| return Collections.emptyList(); |
| } |
| |
| String encodedKey; |
| try { |
| encodedKey = URLEncoder.encode(key, DEFAULT_ENCODING); |
| } catch (UnsupportedEncodingException e) { |
| throw new AssertionError(e); |
| } |
| |
| // Prepend query with "&" making the first parameter the same as the |
| // rest. |
| query = "&" + query; |
| |
| // Parameter prefix. |
| String prefix = "&" + encodedKey + "="; |
| |
| ArrayList<String> values = new ArrayList<String>(); |
| |
| int start = 0; |
| int length = query.length(); |
| while (start < length) { |
| start = query.indexOf(prefix, start); |
| |
| if (start == -1) { |
| // No more values. |
| break; |
| } |
| |
| // Move start to start of value. |
| start += prefix.length(); |
| |
| // Find end of value. |
| int end = query.indexOf('&', start); |
| if (end == -1) { |
| end = query.length(); |
| } |
| |
| String value = query.substring(start, end); |
| values.add(decode(value)); |
| |
| start = end; |
| } |
| |
| return Collections.unmodifiableList(values); |
| } |
| |
| /** |
| * Searches the query string for the first value with the given key. |
| * |
| * @param key which will be encoded |
| * @throws UnsupportedOperationException if this isn't a hierarchical URI |
| * @throws NullPointerException if key is null |
| * |
| * @return the decoded value or null if no parameter is found |
| */ |
| public String getQueryParameter(String key) { |
| if (isOpaque()) { |
| throw new UnsupportedOperationException(NOT_HIERARCHICAL); |
| } |
| |
| String query = getEncodedQuery(); |
| |
| if (query == null) { |
| return null; |
| } |
| |
| String encodedKey; |
| try { |
| encodedKey = URLEncoder.encode(key, DEFAULT_ENCODING); |
| } catch (UnsupportedEncodingException e) { |
| throw new AssertionError(e); |
| } |
| |
| String prefix = encodedKey + "="; |
| |
| if (query.length() < prefix.length()) { |
| return null; |
| } |
| |
| int start; |
| if (query.startsWith(prefix)) { |
| // It's the first parameter. |
| start = prefix.length(); |
| } else { |
| // It must be later in the query string. |
| prefix = "&" + prefix; |
| start = query.indexOf(prefix); |
| |
| if (start == -1) { |
| // Not found. |
| return null; |
| } |
| |
| start += prefix.length(); |
| } |
| |
| // Find end of value. |
| int end = query.indexOf('&', start); |
| if (end == -1) { |
| end = query.length(); |
| } |
| |
| String value = query.substring(start, end); |
| return decode(value); |
| } |
| |
| /** Identifies a null parcelled Uri. */ |
| private static final int NULL_TYPE_ID = 0; |
| |
| /** |
| * Reads Uris from Parcels. |
| */ |
| public static final Parcelable.Creator<Uri> CREATOR |
| = new Parcelable.Creator<Uri>() { |
| public Uri createFromParcel(Parcel in) { |
| int type = in.readInt(); |
| switch (type) { |
| case NULL_TYPE_ID: return null; |
| case StringUri.TYPE_ID: return StringUri.readFrom(in); |
| case OpaqueUri.TYPE_ID: return OpaqueUri.readFrom(in); |
| case HierarchicalUri.TYPE_ID: |
| return HierarchicalUri.readFrom(in); |
| } |
| |
| throw new AssertionError("Unknown URI type: " + type); |
| } |
| |
| public Uri[] newArray(int size) { |
| return new Uri[size]; |
| } |
| }; |
| |
| /** |
| * Writes a Uri to a Parcel. |
| * |
| * @param out parcel to write to |
| * @param uri to write, can be null |
| */ |
| public static void writeToParcel(Parcel out, Uri uri) { |
| if (uri == null) { |
| out.writeInt(NULL_TYPE_ID); |
| } else { |
| uri.writeToParcel(out, 0); |
| } |
| } |
| |
| private static final char[] HEX_DIGITS = "0123456789ABCDEF".toCharArray(); |
| |
| /** |
| * Encodes characters in the given string as '%'-escaped octets |
| * using the UTF-8 scheme. Leaves letters ("A-Z", "a-z"), numbers |
| * ("0-9"), and unreserved characters ("_-!.~'()*") intact. Encodes |
| * all other characters. |
| * |
| * @param s string to encode |
| * @return an encoded version of s suitable for use as a URI component, |
| * or null if s is null |
| */ |
| public static String encode(String s) { |
| return encode(s, null); |
| } |
| |
| /** |
| * Encodes characters in the given string as '%'-escaped octets |
| * using the UTF-8 scheme. Leaves letters ("A-Z", "a-z"), numbers |
| * ("0-9"), and unreserved characters ("_-!.~'()*") intact. Encodes |
| * all other characters with the exception of those specified in the |
| * allow argument. |
| * |
| * @param s string to encode |
| * @param allow set of additional characters to allow in the encoded form, |
| * null if no characters should be skipped |
| * @return an encoded version of s suitable for use as a URI component, |
| * or null if s is null |
| */ |
| public static String encode(String s, String allow) { |
| if (s == null) { |
| return null; |
| } |
| |
| // Lazily-initialized buffers. |
| StringBuilder encoded = null; |
| |
| int oldLength = s.length(); |
| |
| // This loop alternates between copying over allowed characters and |
| // encoding in chunks. This results in fewer method calls and |
| // allocations than encoding one character at a time. |
| int current = 0; |
| while (current < oldLength) { |
| // Start in "copying" mode where we copy over allowed chars. |
| |
| // Find the next character which needs to be encoded. |
| int nextToEncode = current; |
| while (nextToEncode < oldLength |
| && isAllowed(s.charAt(nextToEncode), allow)) { |
| nextToEncode++; |
| } |
| |
| // If there's nothing more to encode... |
| if (nextToEncode == oldLength) { |
| if (current == 0) { |
| // We didn't need to encode anything! |
| return s; |
| } else { |
| // Presumably, we've already done some encoding. |
| encoded.append(s, current, oldLength); |
| return encoded.toString(); |
| } |
| } |
| |
| if (encoded == null) { |
| encoded = new StringBuilder(); |
| } |
| |
| if (nextToEncode > current) { |
| // Append allowed characters leading up to this point. |
| encoded.append(s, current, nextToEncode); |
| } else { |
| // assert nextToEncode == current |
| } |
| |
| // Switch to "encoding" mode. |
| |
| // Find the next allowed character. |
| current = nextToEncode; |
| int nextAllowed = current + 1; |
| while (nextAllowed < oldLength |
| && !isAllowed(s.charAt(nextAllowed), allow)) { |
| nextAllowed++; |
| } |
| |
| // Convert the substring to bytes and encode the bytes as |
| // '%'-escaped octets. |
| String toEncode = s.substring(current, nextAllowed); |
| try { |
| byte[] bytes = toEncode.getBytes(DEFAULT_ENCODING); |
| int bytesLength = bytes.length; |
| for (int i = 0; i < bytesLength; i++) { |
| encoded.append('%'); |
| encoded.append(HEX_DIGITS[(bytes[i] & 0xf0) >> 4]); |
| encoded.append(HEX_DIGITS[bytes[i] & 0xf]); |
| } |
| } catch (UnsupportedEncodingException e) { |
| throw new AssertionError(e); |
| } |
| |
| current = nextAllowed; |
| } |
| |
| // Encoded could still be null at this point if s is empty. |
| return encoded == null ? s : encoded.toString(); |
| } |
| |
| /** |
| * Returns true if the given character is allowed. |
| * |
| * @param c character to check |
| * @param allow characters to allow |
| * @return true if the character is allowed or false if it should be |
| * encoded |
| */ |
| private static boolean isAllowed(char c, String allow) { |
| return (c >= 'A' && c <= 'Z') |
| || (c >= 'a' && c <= 'z') |
| || (c >= '0' && c <= '9') |
| || "_-!.~'()*".indexOf(c) != NOT_FOUND |
| || (allow != null && allow.indexOf(c) != NOT_FOUND); |
| } |
| |
| /** Unicode replacement character: \\uFFFD. */ |
| private static final byte[] REPLACEMENT = { (byte) 0xFF, (byte) 0xFD }; |
| |
| /** |
| * Decodes '%'-escaped octets in the given string using the UTF-8 scheme. |
| * Replaces invalid octets with the unicode replacement character |
| * ("\\uFFFD"). |
| * |
| * @param s encoded string to decode |
| * @return the given string with escaped octets decoded, or null if |
| * s is null |
| */ |
| public static String decode(String s) { |
| /* |
| Compared to java.net.URLEncoderDecoder.decode(), this method decodes a |
| chunk at a time instead of one character at a time, and it doesn't |
| throw exceptions. It also only allocates memory when necessary--if |
| there's nothing to decode, this method won't do much. |
| */ |
| |
| if (s == null) { |
| return null; |
| } |
| |
| // Lazily-initialized buffers. |
| StringBuilder decoded = null; |
| ByteArrayOutputStream out = null; |
| |
| int oldLength = s.length(); |
| |
| // This loop alternates between copying over normal characters and |
| // escaping in chunks. This results in fewer method calls and |
| // allocations than decoding one character at a time. |
| int current = 0; |
| while (current < oldLength) { |
| // Start in "copying" mode where we copy over normal characters. |
| |
| // Find the next escape sequence. |
| int nextEscape = s.indexOf('%', current); |
| |
| if (nextEscape == NOT_FOUND) { |
| if (decoded == null) { |
| // We didn't actually decode anything. |
| return s; |
| } else { |
| // Append the remainder and return the decoded string. |
| decoded.append(s, current, oldLength); |
| return decoded.toString(); |
| } |
| } |
| |
| // Prepare buffers. |
| if (decoded == null) { |
| // Looks like we're going to need the buffers... |
| // We know the new string will be shorter. Using the old length |
| // may overshoot a bit, but it will save us from resizing the |
| // buffer. |
| decoded = new StringBuilder(oldLength); |
| out = new ByteArrayOutputStream(4); |
| } else { |
| // Clear decoding buffer. |
| out.reset(); |
| } |
| |
| // Append characters leading up to the escape. |
| if (nextEscape > current) { |
| decoded.append(s, current, nextEscape); |
| |
| current = nextEscape; |
| } else { |
| // assert current == nextEscape |
| } |
| |
| // Switch to "decoding" mode where we decode a string of escape |
| // sequences. |
| |
| // Decode and append escape sequences. Escape sequences look like |
| // "%ab" where % is literal and a and b are hex digits. |
| try { |
| do { |
| if (current + 2 >= oldLength) { |
| // Truncated escape sequence. |
| out.write(REPLACEMENT); |
| } else { |
| int a = Character.digit(s.charAt(current + 1), 16); |
| int b = Character.digit(s.charAt(current + 2), 16); |
| |
| if (a == -1 || b == -1) { |
| // Non hex digits. |
| out.write(REPLACEMENT); |
| } else { |
| // Combine the hex digits into one byte and write. |
| out.write((a << 4) + b); |
| } |
| } |
| |
| // Move passed the escape sequence. |
| current += 3; |
| } while (current < oldLength && s.charAt(current) == '%'); |
| |
| // Decode UTF-8 bytes into a string and append it. |
| decoded.append(out.toString(DEFAULT_ENCODING)); |
| } catch (UnsupportedEncodingException e) { |
| throw new AssertionError(e); |
| } catch (IOException e) { |
| throw new AssertionError(e); |
| } |
| } |
| |
| // If we don't have a buffer, we didn't have to decode anything. |
| return decoded == null ? s : decoded.toString(); |
| } |
| |
| /** |
| * Support for part implementations. |
| */ |
| static abstract class AbstractPart { |
| |
| /** |
| * Enum which indicates which representation of a given part we have. |
| */ |
| static class Representation { |
| static final int BOTH = 0; |
| static final int ENCODED = 1; |
| static final int DECODED = 2; |
| } |
| |
| volatile String encoded; |
| volatile String decoded; |
| |
| AbstractPart(String encoded, String decoded) { |
| this.encoded = encoded; |
| this.decoded = decoded; |
| } |
| |
| abstract String getEncoded(); |
| |
| final String getDecoded() { |
| @SuppressWarnings("StringEquality") |
| boolean hasDecoded = decoded != NOT_CACHED; |
| return hasDecoded ? decoded : (decoded = decode(encoded)); |
| } |
| |
| final void writeTo(Parcel parcel) { |
| @SuppressWarnings("StringEquality") |
| boolean hasEncoded = encoded != NOT_CACHED; |
| |
| @SuppressWarnings("StringEquality") |
| boolean hasDecoded = decoded != NOT_CACHED; |
| |
| if (hasEncoded && hasDecoded) { |
| parcel.writeInt(Representation.BOTH); |
| parcel.writeString(encoded); |
| parcel.writeString(decoded); |
| } else if (hasEncoded) { |
| parcel.writeInt(Representation.ENCODED); |
| parcel.writeString(encoded); |
| } else if (hasDecoded) { |
| parcel.writeInt(Representation.DECODED); |
| parcel.writeString(decoded); |
| } else { |
| throw new AssertionError(); |
| } |
| } |
| } |
| |
| /** |
| * Immutable wrapper of encoded and decoded versions of a URI part. Lazily |
| * creates the encoded or decoded version from the other. |
| */ |
| static class Part extends AbstractPart { |
| |
| /** A part with null values. */ |
| static final Part NULL = new EmptyPart(null); |
| |
| /** A part with empty strings for values. */ |
| static final Part EMPTY = new EmptyPart(""); |
| |
| private Part(String encoded, String decoded) { |
| super(encoded, decoded); |
| } |
| |
| boolean isEmpty() { |
| return false; |
| } |
| |
| String getEncoded() { |
| @SuppressWarnings("StringEquality") |
| boolean hasEncoded = encoded != NOT_CACHED; |
| return hasEncoded ? encoded : (encoded = encode(decoded)); |
| } |
| |
| static Part readFrom(Parcel parcel) { |
| int representation = parcel.readInt(); |
| switch (representation) { |
| case Representation.BOTH: |
| return from(parcel.readString(), parcel.readString()); |
| case Representation.ENCODED: |
| return fromEncoded(parcel.readString()); |
| case Representation.DECODED: |
| return fromDecoded(parcel.readString()); |
| default: |
| throw new AssertionError(); |
| } |
| } |
| |
| /** |
| * Returns given part or {@link #NULL} if the given part is null. |
| */ |
| static Part nonNull(Part part) { |
| return part == null ? NULL : part; |
| } |
| |
| /** |
| * Creates a part from the encoded string. |
| * |
| * @param encoded part string |
| */ |
| static Part fromEncoded(String encoded) { |
| return from(encoded, NOT_CACHED); |
| } |
| |
| /** |
| * Creates a part from the decoded string. |
| * |
| * @param decoded part string |
| */ |
| static Part fromDecoded(String decoded) { |
| return from(NOT_CACHED, decoded); |
| } |
| |
| /** |
| * Creates a part from the encoded and decoded strings. |
| * |
| * @param encoded part string |
| * @param decoded part string |
| */ |
| static Part from(String encoded, String decoded) { |
| // We have to check both encoded and decoded in case one is |
| // NOT_CACHED. |
| |
| if (encoded == null) { |
| return NULL; |
| } |
| if (encoded.length() == 0) { |
| return EMPTY; |
| } |
| |
| if (decoded == null) { |
| return NULL; |
| } |
| if (decoded .length() == 0) { |
| return EMPTY; |
| } |
| |
| return new Part(encoded, decoded); |
| } |
| |
| private static class EmptyPart extends Part { |
| public EmptyPart(String value) { |
| super(value, value); |
| } |
| |
| @Override |
| boolean isEmpty() { |
| return true; |
| } |
| } |
| } |
| |
| /** |
| * Immutable wrapper of encoded and decoded versions of a path part. Lazily |
| * creates the encoded or decoded version from the other. |
| */ |
| static class PathPart extends AbstractPart { |
| |
| /** A part with null values. */ |
| static final PathPart NULL = new PathPart(null, null); |
| |
| /** A part with empty strings for values. */ |
| static final PathPart EMPTY = new PathPart("", ""); |
| |
| private PathPart(String encoded, String decoded) { |
| super(encoded, decoded); |
| } |
| |
| String getEncoded() { |
| @SuppressWarnings("StringEquality") |
| boolean hasEncoded = encoded != NOT_CACHED; |
| |
| // Don't encode '/'. |
| return hasEncoded ? encoded : (encoded = encode(decoded, "/")); |
| } |
| |
| /** |
| * Cached path segments. This doesn't need to be volatile--we don't |
| * care if other threads see the result. |
| */ |
| private PathSegments pathSegments; |
| |
| /** |
| * Gets the individual path segments. Parses them if necessary. |
| * |
| * @return parsed path segments or null if this isn't a hierarchical |
| * URI |
| */ |
| PathSegments getPathSegments() { |
| if (pathSegments != null) { |
| return pathSegments; |
| } |
| |
| String path = getEncoded(); |
| if (path == null) { |
| return pathSegments = PathSegments.EMPTY; |
| } |
| |
| PathSegmentsBuilder segmentBuilder = new PathSegmentsBuilder(); |
| |
| int previous = 0; |
| int current; |
| while ((current = path.indexOf('/', previous)) > -1) { |
| // This check keeps us from adding a segment if the path starts |
| // '/' and an empty segment for "//". |
| if (previous < current) { |
| String decodedSegment |
| = decode(path.substring(previous, current)); |
| segmentBuilder.add(decodedSegment); |
| } |
| previous = current + 1; |
| } |
| |
| // Add in the final path segment. |
| if (previous < path.length()) { |
| segmentBuilder.add(decode(path.substring(previous))); |
| } |
| |
| return pathSegments = segmentBuilder.build(); |
| } |
| |
| static PathPart appendEncodedSegment(PathPart oldPart, |
| String newSegment) { |
| // If there is no old path, should we make the new path relative |
| // or absolute? I pick absolute. |
| |
| if (oldPart == null) { |
| // No old path. |
| return fromEncoded("/" + newSegment); |
| } |
| |
| String oldPath = oldPart.getEncoded(); |
| |
| if (oldPath == null) { |
| oldPath = ""; |
| } |
| |
| int oldPathLength = oldPath.length(); |
| String newPath; |
| if (oldPathLength == 0) { |
| // No old path. |
| newPath = "/" + newSegment; |
| } else if (oldPath.charAt(oldPathLength - 1) == '/') { |
| newPath = oldPath + newSegment; |
| } else { |
| newPath = oldPath + "/" + newSegment; |
| } |
| |
| return fromEncoded(newPath); |
| } |
| |
| static PathPart appendDecodedSegment(PathPart oldPart, String decoded) { |
| String encoded = encode(decoded); |
| |
| // TODO: Should we reuse old PathSegments? Probably not. |
| return appendEncodedSegment(oldPart, encoded); |
| } |
| |
| static PathPart readFrom(Parcel parcel) { |
| int representation = parcel.readInt(); |
| switch (representation) { |
| case Representation.BOTH: |
| return from(parcel.readString(), parcel.readString()); |
| case Representation.ENCODED: |
| return fromEncoded(parcel.readString()); |
| case Representation.DECODED: |
| return fromDecoded(parcel.readString()); |
| default: |
| throw new AssertionError(); |
| } |
| } |
| |
| /** |
| * Creates a path from the encoded string. |
| * |
| * @param encoded part string |
| */ |
| static PathPart fromEncoded(String encoded) { |
| return from(encoded, NOT_CACHED); |
| } |
| |
| /** |
| * Creates a path from the decoded string. |
| * |
| * @param decoded part string |
| */ |
| static PathPart fromDecoded(String decoded) { |
| return from(NOT_CACHED, decoded); |
| } |
| |
| /** |
| * Creates a path from the encoded and decoded strings. |
| * |
| * @param encoded part string |
| * @param decoded part string |
| */ |
| static PathPart from(String encoded, String decoded) { |
| if (encoded == null) { |
| return NULL; |
| } |
| |
| if (encoded.length() == 0) { |
| return EMPTY; |
| } |
| |
| return new PathPart(encoded, decoded); |
| } |
| |
| /** |
| * Prepends path values with "/" if they're present, not empty, and |
| * they don't already start with "/". |
| */ |
| static PathPart makeAbsolute(PathPart oldPart) { |
| @SuppressWarnings("StringEquality") |
| boolean encodedCached = oldPart.encoded != NOT_CACHED; |
| |
| // We don't care which version we use, and we don't want to force |
| // unneccessary encoding/decoding. |
| String oldPath = encodedCached ? oldPart.encoded : oldPart.decoded; |
| |
| if (oldPath == null || oldPath.length() == 0 |
| || oldPath.startsWith("/")) { |
| return oldPart; |
| } |
| |
| // Prepend encoded string if present. |
| String newEncoded = encodedCached |
| ? "/" + oldPart.encoded : NOT_CACHED; |
| |
| // Prepend decoded string if present. |
| @SuppressWarnings("StringEquality") |
| boolean decodedCached = oldPart.decoded != NOT_CACHED; |
| String newDecoded = decodedCached |
| ? "/" + oldPart.decoded |
| : NOT_CACHED; |
| |
| return new PathPart(newEncoded, newDecoded); |
| } |
| } |
| |
| /** |
| * Creates a new Uri by appending an already-encoded path segment to a |
| * base Uri. |
| * |
| * @param baseUri Uri to append path segment to |
| * @param pathSegment encoded path segment to append |
| * @return a new Uri based on baseUri with the given segment appended to |
| * the path |
| * @throws NullPointerException if baseUri is null |
| */ |
| public static Uri withAppendedPath(Uri baseUri, String pathSegment) { |
| Builder builder = baseUri.buildUpon(); |
| builder = builder.appendEncodedPath(pathSegment); |
| return builder.build(); |
| } |
| } |