The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.content; |
| 18 | |
| 19 | import android.os.Parcel; |
| 20 | import android.os.Parcelable; |
Joe Onorato | 6b61d41 | 2009-05-12 14:42:58 -0400 | [diff] [blame] | 21 | import java.lang.Comparable; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 22 | |
| 23 | /** |
| 24 | * Identifier for a specific application component |
| 25 | * ({@link android.app.Activity}, {@link android.app.Service}, |
| 26 | * {@link android.content.BroadcastReceiver}, or |
| 27 | * {@link android.content.ContentProvider}) that is available. Two |
| 28 | * pieces of information, encapsulated here, are required to identify |
| 29 | * a component: the package (a String) it exists in, and the class (a String) |
| 30 | * name inside of that package. |
| 31 | * |
| 32 | */ |
Joe Onorato | edc649a | 2010-02-08 12:40:45 -0800 | [diff] [blame] | 33 | public final class ComponentName implements Parcelable, Cloneable, Comparable<ComponentName> { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 34 | private final String mPackage; |
| 35 | private final String mClass; |
| 36 | |
| 37 | /** |
| 38 | * Create a new component identifier. |
| 39 | * |
| 40 | * @param pkg The name of the package that the component exists in. Can |
| 41 | * not be null. |
| 42 | * @param cls The name of the class inside of <var>pkg</var> that |
| 43 | * implements the component. Can not be null. |
| 44 | */ |
| 45 | public ComponentName(String pkg, String cls) { |
| 46 | if (pkg == null) throw new NullPointerException("package name is null"); |
| 47 | if (cls == null) throw new NullPointerException("class name is null"); |
| 48 | mPackage = pkg; |
| 49 | mClass = cls; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Create a new component identifier from a Context and class name. |
| 54 | * |
| 55 | * @param pkg A Context for the package implementing the component, |
| 56 | * from which the actual package name will be retrieved. |
| 57 | * @param cls The name of the class inside of <var>pkg</var> that |
| 58 | * implements the component. |
| 59 | */ |
| 60 | public ComponentName(Context pkg, String cls) { |
| 61 | if (cls == null) throw new NullPointerException("class name is null"); |
| 62 | mPackage = pkg.getPackageName(); |
| 63 | mClass = cls; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Create a new component identifier from a Context and Class object. |
| 68 | * |
| 69 | * @param pkg A Context for the package implementing the component, from |
| 70 | * which the actual package name will be retrieved. |
| 71 | * @param cls The Class object of the desired component, from which the |
| 72 | * actual class name will be retrieved. |
| 73 | */ |
| 74 | public ComponentName(Context pkg, Class<?> cls) { |
| 75 | mPackage = pkg.getPackageName(); |
| 76 | mClass = cls.getName(); |
| 77 | } |
| 78 | |
Joe Onorato | edc649a | 2010-02-08 12:40:45 -0800 | [diff] [blame] | 79 | public ComponentName clone() { |
| 80 | return new ComponentName(mPackage, mClass); |
| 81 | } |
| 82 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 83 | /** |
| 84 | * Return the package name of this component. |
| 85 | */ |
| 86 | public String getPackageName() { |
| 87 | return mPackage; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Return the class name of this component. |
| 92 | */ |
| 93 | public String getClassName() { |
| 94 | return mClass; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Return the class name, either fully qualified or in a shortened form |
| 99 | * (with a leading '.') if it is a suffix of the package. |
| 100 | */ |
| 101 | public String getShortClassName() { |
| 102 | if (mClass.startsWith(mPackage)) { |
| 103 | int PN = mPackage.length(); |
| 104 | int CN = mClass.length(); |
| 105 | if (CN > PN && mClass.charAt(PN) == '.') { |
| 106 | return mClass.substring(PN, CN); |
| 107 | } |
| 108 | } |
| 109 | return mClass; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Return a String that unambiguously describes both the package and |
| 114 | * class names contained in the ComponentName. You can later recover |
| 115 | * the ComponentName from this string through |
| 116 | * {@link #unflattenFromString(String)}. |
| 117 | * |
| 118 | * @return Returns a new String holding the package and class names. This |
| 119 | * is represented as the package name, concatenated with a '/' and then the |
| 120 | * class name. |
| 121 | * |
| 122 | * @see #unflattenFromString(String) |
| 123 | */ |
| 124 | public String flattenToString() { |
| 125 | return mPackage + "/" + mClass; |
| 126 | } |
| 127 | |
| 128 | /** |
Dianne Hackborn | 21f1bd1 | 2010-02-19 17:02:21 -0800 | [diff] [blame] | 129 | * The same as {@link #flattenToString()}, but abbreviates the class |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 130 | * name if it is a suffix of the package. The result can still be used |
| 131 | * with {@link #unflattenFromString(String)}. |
| 132 | * |
| 133 | * @return Returns a new String holding the package and class names. This |
| 134 | * is represented as the package name, concatenated with a '/' and then the |
| 135 | * class name. |
| 136 | * |
| 137 | * @see #unflattenFromString(String) |
| 138 | */ |
| 139 | public String flattenToShortString() { |
| 140 | return mPackage + "/" + getShortClassName(); |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Recover a ComponentName from a String that was previously created with |
| 145 | * {@link #flattenToString()}. It splits the string at the first '/', |
| 146 | * taking the part before as the package name and the part after as the |
| 147 | * class name. As a special convenience (to use, for example, when |
| 148 | * parsing component names on the command line), if the '/' is immediately |
| 149 | * followed by a '.' then the final class name will be the concatenation |
| 150 | * of the package name with the string following the '/'. Thus |
| 151 | * "com.foo/.Blah" becomes package="com.foo" class="com.foo.Blah". |
| 152 | * |
| 153 | * @param str The String that was returned by flattenToString(). |
| 154 | * @return Returns a new ComponentName containing the package and class |
| 155 | * names that were encoded in <var>str</var> |
| 156 | * |
| 157 | * @see #flattenToString() |
| 158 | */ |
| 159 | public static ComponentName unflattenFromString(String str) { |
| 160 | int sep = str.indexOf('/'); |
| 161 | if (sep < 0 || (sep+1) >= str.length()) { |
| 162 | return null; |
| 163 | } |
| 164 | String pkg = str.substring(0, sep); |
| 165 | String cls = str.substring(sep+1); |
| 166 | if (cls.length() > 0 && cls.charAt(0) == '.') { |
| 167 | cls = pkg + cls; |
| 168 | } |
| 169 | return new ComponentName(pkg, cls); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Return string representation of this class without the class's name |
| 174 | * as a prefix. |
| 175 | */ |
| 176 | public String toShortString() { |
| 177 | return "{" + mPackage + "/" + mClass + "}"; |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | public String toString() { |
| 182 | return "ComponentInfo{" + mPackage + "/" + mClass + "}"; |
| 183 | } |
| 184 | |
| 185 | @Override |
| 186 | public boolean equals(Object obj) { |
| 187 | try { |
| 188 | if (obj != null) { |
| 189 | ComponentName other = (ComponentName)obj; |
| 190 | // Note: no null checks, because mPackage and mClass can |
| 191 | // never be null. |
| 192 | return mPackage.equals(other.mPackage) |
| 193 | && mClass.equals(other.mClass); |
| 194 | } |
| 195 | } catch (ClassCastException e) { |
| 196 | } |
| 197 | return false; |
| 198 | } |
| 199 | |
| 200 | @Override |
| 201 | public int hashCode() { |
| 202 | return mPackage.hashCode() + mClass.hashCode(); |
| 203 | } |
Joe Onorato | 6b61d41 | 2009-05-12 14:42:58 -0400 | [diff] [blame] | 204 | |
| 205 | public int compareTo(ComponentName that) { |
| 206 | int v; |
| 207 | v = this.mPackage.compareTo(that.mPackage); |
| 208 | if (v != 0) { |
| 209 | return v; |
| 210 | } |
| 211 | return this.mClass.compareTo(that.mClass); |
| 212 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 213 | |
| 214 | public int describeContents() { |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | public void writeToParcel(Parcel out, int flags) { |
| 219 | out.writeString(mPackage); |
| 220 | out.writeString(mClass); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Write a ComponentName to a Parcel, handling null pointers. Must be |
| 225 | * read with {@link #readFromParcel(Parcel)}. |
| 226 | * |
| 227 | * @param c The ComponentName to be written. |
| 228 | * @param out The Parcel in which the ComponentName will be placed. |
| 229 | * |
| 230 | * @see #readFromParcel(Parcel) |
| 231 | */ |
| 232 | public static void writeToParcel(ComponentName c, Parcel out) { |
| 233 | if (c != null) { |
| 234 | c.writeToParcel(out, 0); |
| 235 | } else { |
| 236 | out.writeString(null); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Read a ComponentName from a Parcel that was previously written |
| 242 | * with {@link #writeToParcel(ComponentName, Parcel)}, returning either |
| 243 | * a null or new object as appropriate. |
| 244 | * |
| 245 | * @param in The Parcel from which to read the ComponentName |
| 246 | * @return Returns a new ComponentName matching the previously written |
| 247 | * object, or null if a null had been written. |
| 248 | * |
| 249 | * @see #writeToParcel(ComponentName, Parcel) |
| 250 | */ |
| 251 | public static ComponentName readFromParcel(Parcel in) { |
| 252 | String pkg = in.readString(); |
| 253 | return pkg != null ? new ComponentName(pkg, in) : null; |
| 254 | } |
| 255 | |
| 256 | public static final Parcelable.Creator<ComponentName> CREATOR |
| 257 | = new Parcelable.Creator<ComponentName>() { |
| 258 | public ComponentName createFromParcel(Parcel in) { |
| 259 | return new ComponentName(in); |
| 260 | } |
| 261 | |
| 262 | public ComponentName[] newArray(int size) { |
| 263 | return new ComponentName[size]; |
| 264 | } |
| 265 | }; |
| 266 | |
| 267 | /** |
| 268 | * Instantiate a new ComponentName from the data in a Parcel that was |
| 269 | * previously written with {@link #writeToParcel(Parcel, int)}. Note that you |
| 270 | * must not use this with data written by |
| 271 | * {@link #writeToParcel(ComponentName, Parcel)} since it is not possible |
| 272 | * to handle a null ComponentObject here. |
| 273 | * |
| 274 | * @param in The Parcel containing the previously written ComponentName, |
| 275 | * positioned at the location in the buffer where it was written. |
| 276 | */ |
| 277 | public ComponentName(Parcel in) { |
| 278 | mPackage = in.readString(); |
| 279 | if (mPackage == null) throw new NullPointerException( |
| 280 | "package name is null"); |
| 281 | mClass = in.readString(); |
| 282 | if (mClass == null) throw new NullPointerException( |
| 283 | "class name is null"); |
| 284 | } |
| 285 | |
| 286 | private ComponentName(String pkg, Parcel in) { |
| 287 | mPackage = pkg; |
| 288 | mClass = in.readString(); |
| 289 | } |
| 290 | } |