Source Code Cross Referenced for JstlPropertyHolder.java in  » ERP-CRM-Financial » Kuali-Financial-System » org » kuali » core » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ERP CRM Financial » Kuali Financial System » org.kuali.core.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2005-2006 The Kuali Foundation.
003:         * 
004:         * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
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.kuali.core.util;
017:
018:        import java.util.Collection;
019:        import java.util.Map;
020:        import java.util.Properties;
021:        import java.util.Set;
022:
023:        import org.kuali.core.util.properties.PropertyTree;
024:
025:        /**
026:         * This class implements the Map interface for a Properties instance. Exports all properties from the given Properties instance as
027:         * constants, usable from jstl. Implements the Map interface (by delegating everything to the PropertyTree, which really implements
028:         * the Map methods directly) so that jstl can translate ${Constants.a} into a call to ConfigConstants.get( "a" ).
029:         * <p>
030:         * The contents of this Map cannot be changed once it has been initialized. Any calls to any of the Map methods made before the
031:         * propertyTree has been initialized (i.e. before setProperties has been called) will throw an IllegalStateException.
032:         * <p>
033:         * Jstl converts ${Constants.a.b.c} into get("a").get("b").get("c"), so the properties are stored in a PropertyTree, which converts
034:         * the initial set( "a.b.c", "value" ) into construction of the necessary tree structure to support get("a").get("b").get("c").
035:         * <p>
036:         * Implicitly relies on the assumption that the JSP will be calling toString() on the result of the final <code>get</code>, since
037:         * <code>get</code> can only return one type, and that type must be the complex one so that further dereferencing will be
038:         * possible.
039:         * 
040:         * 
041:         */
042:
043:        public abstract class JstlPropertyHolder implements  Map {
044:            private PropertyTree propertyTree;
045:
046:            /**
047:             * Default constructor
048:             */
049:            public JstlPropertyHolder() {
050:                propertyTree = null;
051:            }
052:
053:            /**
054:             * Creates a propertyTree to store the given properties
055:             * 
056:             * @param properties
057:             */
058:            protected void setProperties(Properties properties) {
059:                propertyTree = new PropertyTree(properties);
060:            }
061:
062:            /**
063:             * Copies in the given propertyTree rather than building its own. Reasonably dangerous, since that tree might presumably be
064:             * modified, violating the readonlyness of this datastructure.
065:             * 
066:             * @param properties
067:             */
068:            protected void setPropertyTree(PropertyTree tree) {
069:                propertyTree = tree;
070:            }
071:
072:            // delegated methods
073:            /**
074:             * @see org.kuali.core.util.properties.PropertyTree#get(java.lang.Object)
075:             */
076:            public Object get(Object key) {
077:                if (propertyTree == null) {
078:                    throw new IllegalStateException(
079:                            "propertyTree has not been initialized");
080:                }
081:                return this .propertyTree.get(key);
082:            }
083:
084:            /**
085:             * @see org.kuali.core.util.properties.PropertyTree#size()
086:             */
087:            public int size() {
088:                if (propertyTree == null) {
089:                    throw new IllegalStateException(
090:                            "propertyTree has not been initialized");
091:                }
092:                return this .propertyTree.size();
093:            }
094:
095:            /**
096:             * @see org.kuali.core.util.properties.PropertyTree#clear()
097:             */
098:            public void clear() {
099:                if (propertyTree == null) {
100:                    throw new IllegalStateException(
101:                            "propertyTree has not been initialized");
102:                }
103:                this .propertyTree.clear();
104:            }
105:
106:            /**
107:             * @see org.kuali.core.util.properties.PropertyTree#isEmpty()
108:             */
109:            public boolean isEmpty() {
110:                if (propertyTree == null) {
111:                    throw new IllegalStateException(
112:                            "propertyTree has not been initialized");
113:                }
114:                return this .propertyTree.isEmpty();
115:            }
116:
117:            /**
118:             * @see org.kuali.core.util.properties.PropertyTree#containsKey(java.lang.Object)
119:             */
120:            public boolean containsKey(Object key) {
121:                if (propertyTree == null) {
122:                    throw new IllegalStateException(
123:                            "propertyTree has not been initialized");
124:                }
125:                return this .propertyTree.containsKey(key);
126:            }
127:
128:            /**
129:             * @see org.kuali.core.util.properties.PropertyTree#containsValue(java.lang.Object)
130:             */
131:            public boolean containsValue(Object value) {
132:                if (propertyTree == null) {
133:                    throw new IllegalStateException(
134:                            "propertyTree has not been initialized");
135:                }
136:                return this .propertyTree.containsValue(value);
137:            }
138:
139:            /**
140:             * @see org.kuali.core.util.properties.PropertyTree#values()
141:             */
142:            public Collection values() {
143:                if (propertyTree == null) {
144:                    throw new IllegalStateException(
145:                            "propertyTree has not been initialized");
146:                }
147:                return this .propertyTree.values();
148:            }
149:
150:            /**
151:             * @see org.kuali.core.util.properties.PropertyTree#putAll(java.util.Map)
152:             */
153:            public void putAll(Map m) {
154:                if (propertyTree == null) {
155:                    throw new IllegalStateException(
156:                            "propertyTree has not been initialized");
157:                }
158:                this .propertyTree.putAll(m);
159:            }
160:
161:            /**
162:             * @see org.kuali.core.util.properties.PropertyTree#entrySet()
163:             */
164:            public Set entrySet() {
165:                if (propertyTree == null) {
166:                    throw new IllegalStateException(
167:                            "propertyTree has not been initialized");
168:                }
169:                return this .propertyTree.entrySet();
170:            }
171:
172:            /**
173:             * @see org.kuali.core.util.properties.PropertyTree#keySet()
174:             */
175:            public Set keySet() {
176:                if (propertyTree == null) {
177:                    throw new IllegalStateException(
178:                            "propertyTree has not been initialized");
179:                }
180:                return this .propertyTree.keySet();
181:            }
182:
183:            /**
184:             * @see org.kuali.core.util.properties.PropertyTree#remove(java.lang.Object)
185:             */
186:            public Object remove(Object key) {
187:                if (propertyTree == null) {
188:                    throw new IllegalStateException(
189:                            "propertyTree has not been initialized");
190:                }
191:                return this .propertyTree.remove(key);
192:            }
193:
194:            /**
195:             * @see org.kuali.core.util.properties.PropertyTree#put(java.lang.Object, java.lang.Object)
196:             */
197:            public Object put(Object key, Object value) {
198:                if (propertyTree == null) {
199:                    throw new IllegalStateException(
200:                            "propertyTree has not been initialized");
201:                }
202:                return this.propertyTree.put(key, value);
203:            }
204:        }
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