J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.net.httpserver; |
| 27 | |
| 28 | import java.util.*; |
| 29 | import java.io.*; |
| 30 | |
| 31 | /** |
| 32 | * HTTP request and response headers are represented by this class which implements |
| 33 | * the interface {@link java.util.Map}< |
| 34 | * {@link java.lang.String},{@link java.util.List}<{@link java.lang.String}>>. |
| 35 | * The keys are case-insensitive Strings representing the header names and |
| 36 | * the value associated with each key is a {@link List}<{@link String}> with one |
| 37 | * element for each occurence of the header name in the request or response. |
| 38 | * <p> |
| 39 | * For example, if a response header instance contains one key "HeaderName" with two values "value1 and value2" |
| 40 | * then this object is output as two header lines: |
| 41 | * <blockquote><pre> |
| 42 | * HeaderName: value1 |
| 43 | * HeaderName: value2 |
| 44 | * </blockquote></pre> |
| 45 | * <p> |
| 46 | * All the normal {@link java.util.Map} methods are provided, but the following |
| 47 | * additional convenience methods are most likely to be used: |
| 48 | * <ul> |
| 49 | * <li>{@link #getFirst(String)} returns a single valued header or the first value of |
| 50 | * a multi-valued header.</li> |
| 51 | * <li>{@link #add(String,String)} adds the given header value to the list for the given key</li> |
| 52 | * <li>{@link #set(String,String)} sets the given header field to the single value given |
| 53 | * overwriting any existing values in the value list. |
| 54 | * </ul><p> |
| 55 | * All methods in this class accept <code>null</code> values for keys and values. However, null |
| 56 | * keys will never will be present in HTTP request headers, and will not be output/sent in response headers. |
| 57 | * Null values can be represented as either a null entry for the key (i.e. the list is null) or |
| 58 | * where the key has a list, but one (or more) of the list's values is null. Null values are output |
| 59 | * as a header line containing the key but no associated value. |
| 60 | * @since 1.6 |
| 61 | */ |
| 62 | public class Headers implements Map<String,List<String>> { |
| 63 | |
| 64 | HashMap<String,List<String>> map; |
| 65 | |
| 66 | public Headers () {map = new HashMap<String,List<String>>(32);} |
| 67 | |
| 68 | /* Normalize the key by converting to following form. |
| 69 | * First char upper case, rest lower case. |
| 70 | * key is presumed to be ASCII |
| 71 | */ |
| 72 | private String normalize (String key) { |
| 73 | if (key == null) { |
| 74 | return null; |
| 75 | } |
| 76 | int len = key.length(); |
| 77 | if (len == 0) { |
| 78 | return key; |
| 79 | } |
| 80 | char[] b = new char [len]; |
| 81 | String s = null; |
| 82 | b = key.toCharArray(); |
| 83 | if (b[0] >= 'a' && b[0] <= 'z') { |
| 84 | b[0] = (char)(b[0] - ('a' - 'A')); |
| 85 | } |
| 86 | for (int i=1; i<len; i++) { |
| 87 | if (b[i] >= 'A' && b[i] <= 'Z') { |
| 88 | b[i] = (char) (b[i] + ('a' - 'A')); |
| 89 | } |
| 90 | } |
| 91 | s = new String (b); |
| 92 | return s; |
| 93 | } |
| 94 | |
| 95 | public int size() {return map.size();} |
| 96 | |
| 97 | public boolean isEmpty() {return map.isEmpty();} |
| 98 | |
| 99 | public boolean containsKey(Object key) { |
| 100 | if (key == null) { |
| 101 | return false; |
| 102 | } |
| 103 | if (!(key instanceof String)) { |
| 104 | return false; |
| 105 | } |
| 106 | return map.containsKey (normalize((String)key)); |
| 107 | } |
| 108 | |
| 109 | public boolean containsValue(Object value) { |
| 110 | return map.containsValue(value); |
| 111 | } |
| 112 | |
| 113 | public List<String> get(Object key) { |
| 114 | return map.get(normalize((String)key)); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * returns the first value from the List of String values |
| 119 | * for the given key (if at least one exists). |
| 120 | * @param key the key to search for |
| 121 | * @return the first string value associated with the key |
| 122 | */ |
| 123 | public String getFirst (String key) { |
| 124 | List<String> l = map.get(normalize((String)key)); |
| 125 | if (l == null) { |
| 126 | return null; |
| 127 | } |
| 128 | return l.get(0); |
| 129 | } |
| 130 | |
| 131 | public List<String> put(String key, List<String> value) { |
| 132 | return map.put (normalize(key), value); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * adds the given value to the list of headers |
| 137 | * for the given key. If the mapping does not |
| 138 | * already exist, then it is created |
| 139 | * @param key the header name |
| 140 | * @param value the header value to add to the header |
| 141 | */ |
| 142 | public void add (String key, String value) { |
| 143 | String k = normalize(key); |
| 144 | List<String> l = map.get(k); |
| 145 | if (l == null) { |
| 146 | l = new LinkedList<String>(); |
| 147 | map.put(k,l); |
| 148 | } |
| 149 | l.add (value); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * sets the given value as the sole header value |
| 154 | * for the given key. If the mapping does not |
| 155 | * already exist, then it is created |
| 156 | * @param key the header name |
| 157 | * @param value the header value to set. |
| 158 | */ |
| 159 | public void set (String key, String value) { |
| 160 | LinkedList<String> l = new LinkedList<String>(); |
| 161 | l.add (value); |
| 162 | put (key, l); |
| 163 | } |
| 164 | |
| 165 | |
| 166 | public List<String> remove(Object key) { |
| 167 | return map.remove(normalize((String)key)); |
| 168 | } |
| 169 | |
| 170 | public void putAll(Map<? extends String,? extends List<String>> t) { |
| 171 | map.putAll (t); |
| 172 | } |
| 173 | |
| 174 | public void clear() {map.clear();} |
| 175 | |
| 176 | public Set<String> keySet() {return map.keySet();} |
| 177 | |
| 178 | public Collection<List<String>> values() {return map.values();} |
| 179 | |
| 180 | public Set<Map.Entry<String, List<String>>> entrySet() { |
| 181 | return map.entrySet(); |
| 182 | } |
| 183 | |
| 184 | public boolean equals(Object o) {return map.equals(o);} |
| 185 | |
| 186 | public int hashCode() {return map.hashCode();} |
| 187 | } |