Source Code Cross Referenced for PredicatedSortedMap.java in  » Library » Apache-common-Collections » org » apache » commons » collections » map » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections.map 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 2003-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:        package org.apache.commons.collections.map;
017:
018:        import java.util.Comparator;
019:        import java.util.SortedMap;
020:
021:        import org.apache.commons.collections.Predicate;
022:
023:        /**
024:         * Decorates another <code>SortedMap </code> to validate that additions
025:         * match a specified predicate.
026:         * <p>
027:         * This map exists to provide validation for the decorated map.
028:         * It is normally created to decorate an empty map.
029:         * If an object cannot be added to the map, an IllegalArgumentException is thrown.
030:         * <p>
031:         * One usage would be to ensure that no null keys are added to the map.
032:         * <pre>SortedMap map = PredicatedSortedSet.decorate(new TreeMap(), NotNullPredicate.INSTANCE, null);</pre>
033:         * <p>
034:         * <strong>Note that PredicatedSortedMap is not synchronized and is not thread-safe.</strong>
035:         * If you wish to use this map from multiple threads concurrently, you must use
036:         * appropriate synchronization. The simplest approach is to wrap this map
037:         * using {@link java.util.Collections#synchronizedSortedMap}. This class may throw 
038:         * exceptions when accessed by concurrent threads without synchronization.
039:         * <p>
040:         * This class is Serializable from Commons Collections 3.1.
041:         *
042:         * @since Commons Collections 3.0
043:         * @version $Revision: 348007 $ $Date: 2005-11-21 22:52:57 +0000 (Mon, 21 Nov 2005) $
044:         * 
045:         * @author Stephen Colebourne
046:         * @author Paul Jack
047:         */
048:        public class PredicatedSortedMap extends PredicatedMap implements 
049:                SortedMap {
050:
051:            /** Serialization version */
052:            private static final long serialVersionUID = 3359846175935304332L;
053:
054:            /**
055:             * Factory method to create a predicated (validating) sorted map.
056:             * <p>
057:             * If there are any elements already in the list being decorated, they
058:             * are validated.
059:             * 
060:             * @param map  the map to decorate, must not be null
061:             * @param keyPredicate  the predicate to validate the keys, null means no check
062:             * @param valuePredicate  the predicate to validate to values, null means no check
063:             * @throws IllegalArgumentException if the map is null
064:             */
065:            public static SortedMap decorate(SortedMap map,
066:                    Predicate keyPredicate, Predicate valuePredicate) {
067:                return new PredicatedSortedMap(map, keyPredicate,
068:                        valuePredicate);
069:            }
070:
071:            //-----------------------------------------------------------------------
072:            /**
073:             * Constructor that wraps (not copies).
074:             * 
075:             * @param map  the map to decorate, must not be null
076:             * @param keyPredicate  the predicate to validate the keys, null means no check
077:             * @param valuePredicate  the predicate to validate to values, null means no check
078:             * @throws IllegalArgumentException if the map is null
079:             */
080:            protected PredicatedSortedMap(SortedMap map,
081:                    Predicate keyPredicate, Predicate valuePredicate) {
082:                super (map, keyPredicate, valuePredicate);
083:            }
084:
085:            //-----------------------------------------------------------------------
086:            /**
087:             * Gets the map being decorated.
088:             * 
089:             * @return the decorated map
090:             */
091:            protected SortedMap getSortedMap() {
092:                return (SortedMap) map;
093:            }
094:
095:            //-----------------------------------------------------------------------
096:            public Object firstKey() {
097:                return getSortedMap().firstKey();
098:            }
099:
100:            public Object lastKey() {
101:                return getSortedMap().lastKey();
102:            }
103:
104:            public Comparator comparator() {
105:                return getSortedMap().comparator();
106:            }
107:
108:            public SortedMap subMap(Object fromKey, Object toKey) {
109:                SortedMap map = getSortedMap().subMap(fromKey, toKey);
110:                return new PredicatedSortedMap(map, keyPredicate,
111:                        valuePredicate);
112:            }
113:
114:            public SortedMap headMap(Object toKey) {
115:                SortedMap map = getSortedMap().headMap(toKey);
116:                return new PredicatedSortedMap(map, keyPredicate,
117:                        valuePredicate);
118:            }
119:
120:            public SortedMap tailMap(Object fromKey) {
121:                SortedMap map = getSortedMap().tailMap(fromKey);
122:                return new PredicatedSortedMap(map, keyPredicate,
123:                        valuePredicate);
124:            }
125:
126:        }
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