Source Code Cross Referenced for Collections12.java in  » Template-Engine » freemarker-2.3.10 » freemarker » template » utility » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » freemarker 2.3.10 » freemarker.template.utility 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003 The Visigoth Software Society. All rights
003:         * reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions
007:         * are met:
008:         *
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         *
012:         * 2. Redistributions in binary form must reproduce the above copyright
013:         *    notice, this list of conditions and the following disclaimer in
014:         *    the documentation and/or other materials provided with the
015:         *    distribution.
016:         *
017:         * 3. The end-user documentation included with the redistribution, if
018:         *    any, must include the following acknowledgement:
019:         *       "This product includes software developed by the
020:         *        Visigoth Software Society (http://www.visigoths.org/)."
021:         *    Alternately, this acknowledgement may appear in the software itself,
022:         *    if and wherever such third-party acknowledgements normally appear.
023:         *
024:         * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
025:         *    project contributors may be used to endorse or promote products derived
026:         *    from this software without prior written permission. For written
027:         *    permission, please contact visigoths@visigoths.org.
028:         *
029:         * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030:         *    nor may "FreeMarker" or "Visigoth" appear in their names
031:         *    without prior written permission of the Visigoth Software Society.
032:         *
033:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036:         * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044:         * SUCH DAMAGE.
045:         * ====================================================================
046:         *
047:         * This software consists of voluntary contributions made by many
048:         * individuals on behalf of the Visigoth Software Society. For more
049:         * information on the Visigoth Software Society, please see
050:         * http://www.visigoths.org/
051:         */
052:
053:        package freemarker.template.utility;
054:
055:        import java.io.Serializable;
056:        import java.util.AbstractList;
057:        import java.util.AbstractMap;
058:        import java.util.Collection;
059:        import java.util.Collections;
060:        import java.util.List;
061:        import java.util.Map;
062:        import java.util.Set;
063:
064:        /**
065:         * Implementation of missing JDK 1.3 collection features for JDK 1.2
066:         * @author Attila Szegedi
067:         * @version $Id: Collections12.java,v 1.2 2004/11/27 14:49:57 ddekany Exp $
068:         */
069:        public class Collections12 {
070:            public static final Map EMPTY_MAP = new EmptyMap();
071:
072:            private Collections12() {
073:            }
074:
075:            private static final class EmptyMap extends AbstractMap implements 
076:                    Serializable {
077:                public int size() {
078:                    return 0;
079:                }
080:
081:                public boolean isEmpty() {
082:                    return true;
083:                }
084:
085:                public boolean containsKey(Object key) {
086:                    return false;
087:                }
088:
089:                public boolean containsValue(Object value) {
090:                    return false;
091:                }
092:
093:                public Object get(Object key) {
094:                    return null;
095:                }
096:
097:                public Set keySet() {
098:                    return Collections.EMPTY_SET;
099:                }
100:
101:                public Collection values() {
102:                    return Collections.EMPTY_SET;
103:                }
104:
105:                public Set entrySet() {
106:                    return Collections.EMPTY_SET;
107:                }
108:
109:                public boolean equals(Object o) {
110:                    return (o instanceof  Map) && ((Map) o).size() == 0;
111:                }
112:
113:                public int hashCode() {
114:                    return 0;
115:                }
116:            }
117:
118:            public static Map singletonMap(Object key, Object value) {
119:                return new SingletonMap(key, value);
120:            }
121:
122:            private static class SingletonMap extends AbstractMap implements 
123:                    Serializable {
124:                private final Object k, v;
125:
126:                SingletonMap(Object key, Object value) {
127:                    k = key;
128:                    v = value;
129:                }
130:
131:                public int size() {
132:                    return 1;
133:                }
134:
135:                public boolean isEmpty() {
136:                    return false;
137:                }
138:
139:                public boolean containsKey(Object key) {
140:                    return eq(key, k);
141:                }
142:
143:                public boolean containsValue(Object value) {
144:                    return eq(value, v);
145:                }
146:
147:                public Object get(Object key) {
148:                    return (eq(key, k) ? v : null);
149:                }
150:
151:                private transient Set keySet = null;
152:                private transient Set entrySet = null;
153:                private transient Collection values = null;
154:
155:                public Set keySet() {
156:                    if (keySet == null)
157:                        keySet = Collections.singleton(k);
158:                    return keySet;
159:                }
160:
161:                public Set entrySet() {
162:                    if (entrySet == null)
163:                        entrySet = Collections.singleton(new ImmutableEntry(k,
164:                                v));
165:                    return entrySet;
166:                }
167:
168:                public Collection values() {
169:                    if (values == null)
170:                        values = Collections.singleton(v);
171:                    return values;
172:                }
173:
174:                private static class ImmutableEntry implements  Map.Entry {
175:                    final Object k;
176:                    final Object v;
177:
178:                    ImmutableEntry(Object key, Object value) {
179:                        k = key;
180:                        v = value;
181:                    }
182:
183:                    public Object getKey() {
184:                        return k;
185:                    }
186:
187:                    public Object getValue() {
188:                        return v;
189:                    }
190:
191:                    public Object setValue(Object value) {
192:                        throw new UnsupportedOperationException();
193:                    }
194:
195:                    public boolean equals(Object o) {
196:                        if (!(o instanceof  Map.Entry))
197:                            return false;
198:                        Map.Entry e = (Map.Entry) o;
199:                        return eq(e.getKey(), k) && eq(e.getValue(), v);
200:                    }
201:
202:                    public int hashCode() {
203:                        return ((k == null ? 0 : k.hashCode()) ^ (v == null ? 0
204:                                : v.hashCode()));
205:                    }
206:
207:                    public String toString() {
208:                        return k + "=" + v;
209:                    }
210:                }
211:            }
212:
213:            public static List singletonList(Object o) {
214:                return new SingletonList(o);
215:            }
216:
217:            private static class SingletonList extends AbstractList implements 
218:                    Serializable {
219:                private final Object element;
220:
221:                SingletonList(Object obj) {
222:                    element = obj;
223:                }
224:
225:                public int size() {
226:                    return 1;
227:                }
228:
229:                public boolean contains(Object obj) {
230:                    return eq(obj, element);
231:                }
232:
233:                public Object get(int index) {
234:                    if (index != 0)
235:                        throw new IndexOutOfBoundsException("Index: " + index
236:                                + ", Size: 1");
237:                    return element;
238:                }
239:            }
240:
241:            private static boolean eq(Object o1, Object o2) {
242:                return (o1 == null ? o2 == null : o1.equals(o2));
243:            }
244:        }
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