| /* |
| $Id$ |
| |
| Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. |
| |
| Redistribution and use of this software and associated documentation |
| ("Software"), with or without modification, are permitted provided |
| that the following conditions are met: |
| |
| 1. Redistributions of source code must retain copyright |
| statements and notices. Redistributions must also contain a |
| copy of this document. |
| |
| 2. Redistributions in binary form must reproduce the |
| above copyright notice, this list of conditions and the |
| following disclaimer in the documentation and/or other |
| materials provided with the distribution. |
| |
| 3. The name "groovy" must not be used to endorse or promote |
| products derived from this Software without prior written |
| permission of The Codehaus. For written permission, |
| please contact info@codehaus.org. |
| |
| 4. Products derived from this Software may not be called "groovy" |
| nor may "groovy" appear in their names without prior written |
| permission of The Codehaus. "groovy" is a registered |
| trademark of The Codehaus. |
| |
| 5. Due credit should be given to The Codehaus - |
| http://groovy.codehaus.org/ |
| |
| THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS |
| ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT |
| NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| */ |
| package groovy.model; |
| |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyChangeSupport; |
| |
| /** |
| * A simple ValueModle implementation which is a holder of an object value. |
| * Used to share local variables with closures |
| * |
| * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> |
| * @version $Revision$ |
| */ |
| public class ValueHolder implements ValueModel { |
| private Object value; |
| private Class type; |
| private PropertyChangeSupport propertyChangeSupport; |
| private boolean editable = true; |
| |
| public ValueHolder() { |
| this(Object.class); |
| } |
| |
| public ValueHolder(Class type) { |
| this.type = type; |
| } |
| |
| public ValueHolder(Object value) { |
| this.value = value; |
| this.type = (value != null) ? value.getClass() : Object.class; |
| } |
| |
| /** |
| * Add a PropertyChangeListener to the listener list. |
| * @param listener The listener to add. |
| */ |
| public void addPropertyChangeListener(PropertyChangeListener listener) { |
| if ( propertyChangeSupport == null ) { |
| propertyChangeSupport = new PropertyChangeSupport(this); |
| } |
| propertyChangeSupport.addPropertyChangeListener(listener); |
| } |
| |
| /** |
| * Removes a PropertyChangeListener from the listener list. |
| * @param listener The listener to remove. |
| */ |
| public void removePropertyChangeListener(PropertyChangeListener listener) { |
| if ( propertyChangeSupport != null ) { |
| propertyChangeSupport.removePropertyChangeListener(listener); |
| } |
| } |
| |
| |
| public Object getValue() { |
| return value; |
| } |
| |
| public void setValue(Object value) { |
| Object oldValue = this.value; |
| this.value = value; |
| if ( propertyChangeSupport != null ) { |
| propertyChangeSupport.firePropertyChange("value", oldValue, value); |
| } |
| } |
| |
| public Class getType() { |
| return type; |
| } |
| |
| public boolean isEditable() { |
| return editable; |
| } |
| |
| public void setEditable(boolean editable) { |
| this.editable = editable; |
| } |
| |
| } |