Source Code Cross Referenced for ListResourceBundle.java in  » Apache-Harmony-Java-SE » java-package » java » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */
017:
018:        package java.util;
019:
020:        /**
021:         * ListResourceBundle is the abstract superclass of classes which provide
022:         * resources by implementing the <code>getContents()</code> method to return
023:         * the list of resources.
024:         * 
025:         * @see ResourceBundle
026:         * @since 1.1
027:         */
028:        public abstract class ListResourceBundle extends ResourceBundle {
029:            HashMap<String, Object> table;
030:
031:            /**
032:             * Constructs a new instance of this class.
033:             */
034:            public ListResourceBundle() {
035:                super ();
036:            }
037:
038:            /**
039:             * Answers an Object array which contains the resources of this
040:             * ListResourceBundle. Each element in the array is an array of two
041:             * elements, the first is the resource key and the second is the resource.
042:             * 
043:             * @return a Object array containing the resources
044:             */
045:            protected abstract Object[][] getContents();
046:
047:            /**
048:             * Answers the names of the resources contained in this ListResourceBundle.
049:             * 
050:             * @return an Enumeration of the resource names
051:             */
052:            @Override
053:            public Enumeration<String> getKeys() {
054:                initializeTable();
055:                if (parent != null) {
056:                    return new Enumeration<String>() {
057:                        Iterator<String> local = table.keySet().iterator();
058:
059:                        Enumeration<String> pEnum = parent.getKeys();
060:
061:                        String nextElement;
062:
063:                        private boolean findNext() {
064:                            if (nextElement != null) {
065:                                return true;
066:                            }
067:                            while (pEnum.hasMoreElements()) {
068:                                String next = pEnum.nextElement();
069:                                if (!table.containsKey(next)) {
070:                                    nextElement = next;
071:                                    return true;
072:                                }
073:                            }
074:                            return false;
075:                        }
076:
077:                        public boolean hasMoreElements() {
078:                            if (local.hasNext()) {
079:                                return true;
080:                            }
081:                            return findNext();
082:                        }
083:
084:                        public String nextElement() {
085:                            if (local.hasNext()) {
086:                                return local.next();
087:                            }
088:                            if (findNext()) {
089:                                String result = nextElement;
090:                                nextElement = null;
091:                                return result;
092:                            }
093:                            // Cause an exception
094:                            return pEnum.nextElement();
095:                        }
096:                    };
097:                } else {
098:                    return new Enumeration<String>() {
099:                        Iterator<String> it = table.keySet().iterator();
100:
101:                        public boolean hasMoreElements() {
102:                            return it.hasNext();
103:                        }
104:
105:                        public String nextElement() {
106:                            return it.next();
107:                        }
108:                    };
109:                }
110:            }
111:
112:            /**
113:             * Answers the named resource from this ResourceBundle, or null if the
114:             * resource is not found.
115:             * 
116:             * @param key
117:             *            the name of the resource
118:             * @return the resource object
119:             */
120:            @Override
121:            public final Object handleGetObject(String key) {
122:                initializeTable();
123:                if (key == null) {
124:                    throw new NullPointerException();
125:                }
126:                return table.get(key);
127:            }
128:
129:            private synchronized void initializeTable() {
130:                if (table == null) {
131:                    Object[][] contents = getContents();
132:                    table = new HashMap<String, Object>(
133:                            contents.length / 3 * 4 + 3);
134:                    for (Object[] content : contents) {
135:                        if (content[0] == null || content[1] == null) {
136:                            throw new NullPointerException();
137:                        }
138:                        table.put((String) content[0], content[1]);
139:                    }
140:                }
141:            }
142:        }
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