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

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


001:        /*
002:         $Id: ValueHolder.java 4032 2006-08-30 07:18:49Z mguillem $
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.model;
047:
048:        import java.beans.PropertyChangeListener;
049:        import java.beans.PropertyChangeSupport;
050:
051:        /**
052:         * A simple ValueModle implementation which is a holder of an object value. 
053:         * Used to share local variables with closures
054:         * 
055:         * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
056:         * @version $Revision: 4032 $
057:         */
058:        public class ValueHolder implements  ValueModel {
059:            private Object value;
060:            private Class type;
061:            private PropertyChangeSupport propertyChangeSupport;
062:            private boolean editable = true;
063:
064:            public ValueHolder() {
065:                this (Object.class);
066:            }
067:
068:            public ValueHolder(Class type) {
069:                this .type = type;
070:            }
071:
072:            public ValueHolder(Object value) {
073:                this .value = value;
074:                this .type = (value != null) ? value.getClass() : Object.class;
075:            }
076:
077:            /** 
078:             * Add a PropertyChangeListener to the listener list.
079:             * @param listener The listener to add.
080:             */
081:            public void addPropertyChangeListener(
082:                    PropertyChangeListener listener) {
083:                if (propertyChangeSupport == null) {
084:                    propertyChangeSupport = new PropertyChangeSupport(this );
085:                }
086:                propertyChangeSupport.addPropertyChangeListener(listener);
087:            }
088:
089:            /** 
090:             * Removes a PropertyChangeListener from the listener list.
091:             * @param listener The listener to remove.
092:             */
093:            public void removePropertyChangeListener(
094:                    PropertyChangeListener listener) {
095:                if (propertyChangeSupport != null) {
096:                    propertyChangeSupport
097:                            .removePropertyChangeListener(listener);
098:                }
099:            }
100:
101:            public Object getValue() {
102:                return value;
103:            }
104:
105:            public void setValue(Object value) {
106:                Object oldValue = this .value;
107:                this .value = value;
108:                if (propertyChangeSupport != null) {
109:                    propertyChangeSupport.firePropertyChange("value", oldValue,
110:                            value);
111:                }
112:            }
113:
114:            public Class getType() {
115:                return type;
116:            }
117:
118:            public boolean isEditable() {
119:                return editable;
120:            }
121:
122:            public void setEditable(boolean editable) {
123:                this.editable = editable;
124:            }
125:
126:        }
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