| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package groovy.model; |
| |
| import java.beans.PropertyChangeListener; |
| import java.beans.PropertyChangeSupport; |
| |
| /** |
| * A simple ValueModel 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 final 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; |
| } |
| |
| } |