Source Code Cross Referenced for Expando.java in  » Scripting » groovy-1.0 » groovy » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » groovy.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         $Id: Expando.java 4578 2006-12-22 11:59:52Z blackdrag $
003:
004:         Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005:
006:         Redistribution and use of this software and associated documentation
007:         ("Software"), with or without modification, are permitted provided
008:         that the following conditions are met:
009:
010:         1. Redistributions of source code must retain copyright
011:            statements and notices.  Redistributions must also contain a
012:            copy of this document.
013:
014:         2. Redistributions in binary form must reproduce the
015:            above copyright notice, this list of conditions and the
016:            following disclaimer in the documentation and/or other
017:            materials provided with the distribution.
018:
019:         3. The name "groovy" must not be used to endorse or promote
020:            products derived from this Software without prior written
021:            permission of The Codehaus.  For written permission,
022:            please contact info@codehaus.org.
023:
024:         4. Products derived from this Software may not be called "groovy"
025:            nor may "groovy" appear in their names without prior written
026:            permission of The Codehaus. "groovy" is a registered
027:            trademark of The Codehaus.
028:
029:         5. Due credit should be given to The Codehaus -
030:            http://groovy.codehaus.org/
031:
032:         THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033:         ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034:         NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035:         FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036:         THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042:         ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043:         OF THE POSSIBILITY OF SUCH DAMAGE.
044:
045:         */
046:        package groovy.util;
047:
048:        import groovy.lang.Closure;
049:        import groovy.lang.GroovyObjectSupport;
050:        import groovy.lang.GroovyRuntimeException;
051:        import groovy.lang.MetaExpandoProperty;
052:        import groovy.lang.MissingPropertyException;
053:
054:        import java.util.HashMap;
055:        import java.util.Map;
056:        import java.util.Map.Entry;
057:        import java.util.List;
058:        import java.util.ArrayList;
059:        import java.util.Iterator;
060:
061:        /**
062:         * Represents a dynamically expandable bean.
063:         * 
064:         * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
065:         * @author Hein Meling
066:         * @author Pilho Kim
067:         * @version $Revision: 4578 $
068:         */
069:        public class Expando extends GroovyObjectSupport {
070:
071:            private Map expandoProperties;
072:
073:            public Expando() {
074:            }
075:
076:            public Expando(Map expandoProperties) {
077:                this .expandoProperties = expandoProperties;
078:            }
079:
080:            /**
081:             * @return the dynamically expanded properties
082:             */
083:            public Map getProperties() {
084:                if (expandoProperties == null) {
085:                    expandoProperties = createMap();
086:                }
087:                return expandoProperties;
088:            }
089:
090:            public List getMetaPropertyValues() {
091:                // run through all our current properties and create MetaProperty objects
092:                List ret = new ArrayList();
093:                Iterator itr = getProperties().entrySet().iterator();
094:                while (itr.hasNext()) {
095:                    Entry entry = (Entry) itr.next();
096:                    ret.add(new MetaExpandoProperty(entry));
097:                }
098:
099:                return ret;
100:            }
101:
102:            public Object getProperty(String property) {
103:                // always use the expando properties first
104:                Object result = getProperties().get(property);
105:                if (result != null)
106:                    return result;
107:                try {
108:                    return super .getProperty(property);
109:                } catch (MissingPropertyException e) {
110:                }
111:                return null;
112:            }
113:
114:            public void setProperty(String property, Object newValue) {
115:                // always use the expando properties
116:                getProperties().put(property, newValue);
117:            }
118:
119:            public Object invokeMethod(String name, Object args) {
120:                try {
121:                    return super .invokeMethod(name, args);
122:                } catch (GroovyRuntimeException e) {
123:                    // br should get a "native" property match first. getProperty includes such fall-back logic
124:                    Object value = this .getProperty(name);
125:                    if (value instanceof  Closure) {
126:                        Closure closure = (Closure) value;
127:                        closure.setDelegate(this );
128:                        return closure.call((Object[]) args);
129:                    } else {
130:                        throw e;
131:                    }
132:                }
133:
134:            }
135:
136:            /**
137:             * This allows toString to be overridden by a closure <i>field</i> method attached
138:             * to the expando object.
139:             * 
140:             * @see java.lang.Object#toString()
141:             */
142:            public String toString() {
143:                Object method = getProperties().get("toString");
144:                if (method != null && method instanceof  Closure) {
145:                    // invoke overridden toString closure method
146:                    Closure closure = (Closure) method;
147:                    closure.setDelegate(this );
148:                    return closure.call().toString();
149:                } else {
150:                    return expandoProperties.toString();
151:                }
152:            }
153:
154:            /**
155:             * This allows equals to be overridden by a closure <i>field</i> method attached
156:             * to the expando object.
157:             *
158:             * @see java.lang.Object#equals(java.lang.Object)
159:             */
160:            public boolean equals(Object obj) {
161:                Object method = getProperties().get("equals");
162:                if (method != null && method instanceof  Closure) {
163:                    // invoke overridden equals closure method
164:                    Closure closure = (Closure) method;
165:                    closure.setDelegate(this );
166:                    Boolean ret = (Boolean) closure.call(obj);
167:                    return ret.booleanValue();
168:                } else {
169:                    return super .equals(obj);
170:                }
171:            }
172:
173:            /**
174:             * This allows hashCode to be overridden by a closure <i>field</i> method attached
175:             * to the expando object.
176:             *
177:             * @see java.lang.Object#hashCode()
178:             */
179:            public int hashCode() {
180:                Object method = getProperties().get("hashCode");
181:                if (method != null && method instanceof  Closure) {
182:                    // invoke overridden hashCode closure method
183:                    Closure closure = (Closure) method;
184:                    closure.setDelegate(this );
185:                    Integer ret = (Integer) closure.call();
186:                    return ret.intValue();
187:                } else {
188:                    return super .hashCode();
189:                }
190:            }
191:
192:            /**
193:             * Factory method to create a new Map used to store the expando properties map
194:             * @return a newly created Map implementation
195:             */
196:            protected Map createMap() {
197:                return new HashMap();
198:            }
199:
200:        }
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