Source Code Cross Referenced for BeanContext.java in  » Ajax » Laszlo-4.0.10 » org » openlaszlo » iv » flash » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » org.openlaszlo.iv.flash.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: BeanContext.java,v 1.5 2002/06/06 15:02:07 valis Exp $
003:         *
004:         * ===========================================================================
005:         *
006:         * The JGenerator Software License, Version 1.0
007:         *
008:         * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions are met:
012:         *
013:         * 1. Redistributions of source code must retain the above copyright
014:         *    notice, this list of conditions and the following disclaimer.
015:         *
016:         * 2. Redistributions in binary form must reproduce the above copyright
017:         *    notice, this list of conditions and the following disclaimer in
018:         *    the documentation and/or other materials provided with the
019:         *    distribution.
020:         *
021:         * 3. The end-user documentation included with the redistribution, if
022:         *    any, must include the following acknowlegement:
023:         *    "This product includes software developed by Dmitry Skavish
024:         *     (skavish@usa.net, http://www.flashgap.com/)."
025:         *    Alternately, this acknowlegement may appear in the software itself,
026:         *    if and wherever such third-party acknowlegements normally appear.
027:         *
028:         * 4. The name "The JGenerator" must not be used to endorse or promote
029:         *    products derived from this software without prior written permission.
030:         *    For written permission, please contact skavish@usa.net.
031:         *
032:         * 5. Products derived from this software may not be called "The JGenerator"
033:         *    nor may "The JGenerator" appear in their names without prior written
034:         *    permission of Dmitry Skavish.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         *
049:         */
050:
051:        package org.openlaszlo.iv.flash.context;
052:
053:        import org.apache.commons.jexl.Expression;
054:        import org.apache.commons.jexl.ExpressionFactory;
055:        import org.apache.commons.jexl.context.HashMapContext;
056:
057:        import java.util.ArrayList;
058:        import java.util.Collection;
059:        import java.util.List;
060:        import java.util.ListIterator;
061:        import java.util.Map;
062:        import java.util.Set;
063:
064:        /**
065:         * A Context that provides access to a graph of objects (beans and collections)
066:         * using Jexl (JSTL expression language + extenstions) syntax.
067:         *
068:         * Unlike the other contexts in JGen, this is not easily creatable from a
069:         * datasource, and is intended to be used where JGen is embedded in another
070:         * framework.
071:         *
072:         * @author <a href="james@jamestaylor.org">James Taylor</a>
073:         */
074:        public class BeanContext extends GraphContext implements  Map {
075:            /** Key used to store root object when building a context for a list item */
076:            public static final String ROOT_ITEM_KEY = "root";
077:
078:            /** The JexlContext */
079:            private HashMapContext jexlContext = new HashMapContext();
080:
081:            /**
082:             * Creates empty context.
083:             */
084:            public BeanContext() {
085:            }
086:
087:            /**
088:             * Creates context from specified hashtable.
089:             *
090:             * @param context parent context
091:             * @param values Map of initial values to populate context with
092:             */
093:            public BeanContext(Context context, Map values) {
094:                setParent(context);
095:
096:                if (values != null) {
097:                    this .jexlContext.setVars(values);
098:                }
099:            }
100:
101:            /**
102:             * Tries to resolve given string in this context as XPath expression,
103:             * using JPath. If the XPath expression selects an object, the result
104:             * of evaluating its 'toString' method is returned, otherwise the path
105:             * is passed along to the parent context (if defined).
106:             *
107:             * @param path XPath/JPath expression
108:             *
109:             * @return String representation of result of xpath execution or result
110:             *         from the parent or null
111:             */
112:
113:            public String getValue(String path) {
114:                // Evaluate path against our context
115:
116:                Object o = evaluatePath(path);
117:
118:                // If o is null, that indicates that the path expression did not
119:                // select an object in the context. This is perfectly acceptable,
120:                // and we pass the path to the parent context.
121:
122:                if (o == null) {
123:                    return getValueFromParent(path);
124:                }
125:
126:                // If o was not null, we return it's string representation, which is
127:                // hopefully something meaningfull. But even if it is not the default
128:                // implementation of Object.toString() should give a value which will
129:                // allow the user to see that something is wrong with the path or
130:                // context.
131:
132:                else {
133:                    return o.toString();
134:                }
135:            }
136:
137:            /**
138:             * Tries to resolve given string in this context as Jexl expression.
139:             * If the path expression evaluates to a non-empty list, a list of contexts
140:             * corresponding to each value in that list will be returned. Otherwise
141:             * the path is passed to the parent context. If there is no parent
142:             * context, null is returned.
143:             *
144:             * The wrapping contexts will have the single element 'root' which is the
145:             * object selected as a list item.
146:             *
147:             * @param path Jexl expression
148:             *
149:             * @return List of objects (wrapped in BeanContext) selected by path or
150:             *         result from the parent or null
151:             */
152:            public List getValueList(String path) {
153:                // Evaluate path against our context
154:
155:                Object o = evaluatePath(path);
156:
157:                // If o is null, that indicates that the path expression did not
158:                // select an object in the context. This is perfectly acceptable,
159:                // and we pass the path to the parent context.
160:
161:                if (o == null) {
162:                    return getValueListFromParent(path);
163:                }
164:
165:                // If o is a list, we build a list of contexts for each object it
166:                // contains. If o is a single object we'll just build a context list
167:                // with one item.
168:
169:                ArrayList contextList = new ArrayList();
170:
171:                if (o instanceof  List) {
172:                    ListIterator iter = ((List) o).listIterator();
173:
174:                    while (iter.hasNext()) {
175:                        addToContextList(iter.next(), contextList);
176:                    }
177:                } else {
178:                    addToContextList(o, contextList);
179:                }
180:
181:                return contextList;
182:            }
183:
184:            /**
185:             * Build a BeanContext around and object and add it to the provided list.
186:             *
187:             * @param o Object to add
188:             * @param contextList List to add context to
189:             */
190:            private void addToContextList(Object o, List contextList) {
191:                BeanContext newContext = new BeanContext(this , null);
192:
193:                newContext.put(ROOT_ITEM_KEY, o);
194:
195:                contextList.add(newContext);
196:            }
197:
198:            /**
199:             * Evaluate a path as a Jexl expression on the contained context.
200:             *
201:             * @param path Expression to evaluate
202:             * @return Object if found or null
203:             */
204:            private Object evaluatePath(String path) {
205:                try {
206:                    // Parse the path into a Jexl Expression
207:
208:                    Expression expr = ExpressionFactory.createExpression(path);
209:
210:                    // Execute the expression against our context
211:
212:                    Object o = expr.evaluate(jexlContext);
213:
214:                    return o;
215:                } catch (Exception e) {
216:                    // Expression could not be parsed or evaluated as Jexl, so return
217:                    // null which will cause the path to be passed up to that parent
218:
219:                    return null;
220:                }
221:            }
222:
223:            // ------------------------------ interface Map, delegate to HashMapContext
224:
225:            public int size() {
226:                return jexlContext.size();
227:            }
228:
229:            public boolean isEmpty() {
230:                return jexlContext.isEmpty();
231:            }
232:
233:            public boolean containsKey(Object key) {
234:                return jexlContext.containsKey(key);
235:            }
236:
237:            public boolean containsValue(Object value) {
238:                return jexlContext.containsValue(value);
239:            }
240:
241:            public Object get(Object key) {
242:                return jexlContext.get(key);
243:            }
244:
245:            public Object put(Object key, Object value) {
246:                return jexlContext.put(key, value);
247:            }
248:
249:            public Object remove(Object key) {
250:                return jexlContext.remove(key);
251:            }
252:
253:            public void putAll(Map t) {
254:                jexlContext.putAll(t);
255:            }
256:
257:            public void clear() {
258:                jexlContext.clear();
259:            }
260:
261:            public Set keySet() {
262:                return jexlContext.keySet();
263:            }
264:
265:            public Collection values() {
266:                return jexlContext.values();
267:            }
268:
269:            public Set entrySet() {
270:                return jexlContext.entrySet();
271:            }
272:
273:            public boolean equals(Object o) {
274:                return jexlContext.equals(o);
275:            }
276:
277:            public int hashCode() {
278:                return jexlContext.hashCode();
279:            }
280:
281:        }
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