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Groovy: A powerful, dynamic language for the JVM
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 James Strachan
*/
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;
}
}