Source Code Cross Referenced for ParameterMap.java in  » Sevlet-Container » tomcat-catalina » org » apache » catalina » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 1999,2004 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:
017:        package org.apache.catalina.util;
018:
019:        import java.util.HashMap;
020:        import java.util.Map;
021:
022:        /**
023:         * Extended implementation of <strong>HashMap</strong> that includes a
024:         * <code>locked</code> property.  This class can be used to safely expose
025:         * Catalina internal parameter map objects to user classes without having
026:         * to clone them in order to avoid modifications.  When first created, a
027:         * <code>ParmaeterMap</code> instance is not locked.
028:         *
029:         * @author Craig R. McClanahan
030:         * @version $Revision: 1.2 $ $Date: 2004/02/27 14:58:50 $
031:         */
032:
033:        public final class ParameterMap extends HashMap {
034:
035:            // ----------------------------------------------------------- Constructors
036:
037:            /**
038:             * Construct a new, empty map with the default initial capacity and
039:             * load factor.
040:             */
041:            public ParameterMap() {
042:
043:                super ();
044:
045:            }
046:
047:            /**
048:             * Construct a new, empty map with the specified initial capacity and
049:             * default load factor.
050:             *
051:             * @param initialCapacity The initial capacity of this map
052:             */
053:            public ParameterMap(int initialCapacity) {
054:
055:                super (initialCapacity);
056:
057:            }
058:
059:            /**
060:             * Construct a new, empty map with the specified initial capacity and
061:             * load factor.
062:             *
063:             * @param initialCapacity The initial capacity of this map
064:             * @param loadFactor The load factor of this map
065:             */
066:            public ParameterMap(int initialCapacity, float loadFactor) {
067:
068:                super (initialCapacity, loadFactor);
069:
070:            }
071:
072:            /**
073:             * Construct a new map with the same mappings as the given map.
074:             *
075:             * @param map Map whose contents are dupliated in the new map
076:             */
077:            public ParameterMap(Map map) {
078:
079:                super (map);
080:
081:            }
082:
083:            // ------------------------------------------------------------- Properties
084:
085:            /**
086:             * The current lock state of this parameter map.
087:             */
088:            private boolean locked = false;
089:
090:            /**
091:             * Return the locked state of this parameter map.
092:             */
093:            public boolean isLocked() {
094:
095:                return (this .locked);
096:
097:            }
098:
099:            /**
100:             * Set the locked state of this parameter map.
101:             *
102:             * @param locked The new locked state
103:             */
104:            public void setLocked(boolean locked) {
105:
106:                this .locked = locked;
107:
108:            }
109:
110:            /**
111:             * The string manager for this package.
112:             */
113:            private static final StringManager sm = StringManager
114:                    .getManager("org.apache.catalina.util");
115:
116:            // --------------------------------------------------------- Public Methods
117:
118:            /**
119:             * Remove all mappings from this map.
120:             *
121:             * @exception IllegalStateException if this map is currently locked
122:             */
123:            public void clear() {
124:
125:                if (locked)
126:                    throw new IllegalStateException(sm
127:                            .getString("parameterMap.locked"));
128:                super .clear();
129:
130:            }
131:
132:            /**
133:             * Associate the specified value with the specified key in this map.  If
134:             * the map previously contained a mapping for this key, the old value is
135:             * replaced.
136:             *
137:             * @param key Key with which the specified value is to be associated
138:             * @param value Value to be associated with the specified key
139:             *
140:             * @return The previous value associated with the specified key, or
141:             *  <code>null</code> if there was no mapping for key
142:             *
143:             * @exception IllegalStateException if this map is currently locked
144:             */
145:            public Object put(Object key, Object value) {
146:
147:                if (locked)
148:                    throw new IllegalStateException(sm
149:                            .getString("parameterMap.locked"));
150:                return (super .put(key, value));
151:
152:            }
153:
154:            /**
155:             * Copy all of the mappings from the specified map to this one.  These
156:             * mappings replace any mappings that this map had for any of the keys
157:             * currently in the specified Map.
158:             *
159:             * @param map Mappings to be stored into this map
160:             *
161:             * @exception IllegalStateException if this map is currently locked
162:             */
163:            public void putAll(Map map) {
164:
165:                if (locked)
166:                    throw new IllegalStateException(sm
167:                            .getString("parameterMap.locked"));
168:                super .putAll(map);
169:
170:            }
171:
172:            /**
173:             * Remove the mapping for this key from the map if present.
174:             *
175:             * @param key Key whose mapping is to be removed from the map
176:             *
177:             * @return The previous value associated with the specified key, or
178:             *  <code>null</code> if there was no mapping for that key
179:             *
180:             * @exception IllegalStateException if this map is currently locked
181:             */
182:            public Object remove(Object key) {
183:
184:                if (locked)
185:                    throw new IllegalStateException(sm
186:                            .getString("parameterMap.locked"));
187:                return (super.remove(key));
188:
189:            }
190:
191:        }
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