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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2007-2009 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 org.codehaus.groovy.binding;
import groovy.lang.MissingMethodException;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
/**
* @author Danno Ferrin
* @version $Revision: 16264 $
* @since Groovy 1.1
*/
public class PropertyBinding implements SourceBinding, TargetBinding, TriggerBinding {
Object bean;
String propertyName;
boolean nonChangeCheck;
public PropertyBinding(Object bean, String propertyName) {
this.bean = bean;
this.propertyName = propertyName;
}
public void updateTargetValue(Object newValue) {
if (nonChangeCheck) {
if (DefaultTypeTransformation.compareEqual(getSourceValue(), newValue)) {
// not a change, don't fire it
return;
}
}
InvokerHelper.setProperty(bean, propertyName, newValue);
}
public boolean isNonChangeCheck() {
return nonChangeCheck;
}
public void setNonChangeCheck(boolean nonChangeCheck) {
this.nonChangeCheck = nonChangeCheck;
}
public Object getSourceValue() {
return InvokerHelper.getPropertySafe(bean, propertyName);
}
public FullBinding createBinding(SourceBinding source, TargetBinding target) {
return new PropertyFullBinding(source, target);
}
class PropertyFullBinding extends AbstractFullBinding implements PropertyChangeListener {
Object boundBean;
Object boundProperty;
boolean bound;
boolean boundToProperty;
PropertyFullBinding(SourceBinding source, TargetBinding target) {
setSourceBinding(source);
setTargetBinding(target);
}
public void propertyChange(PropertyChangeEvent event) {
if (boundToProperty || event.getPropertyName().equals(boundProperty)) {
update();
}
}
public void bind() {
if (!bound) {
bound = true;
boundBean = bean;
boundProperty = propertyName;
try {
InvokerHelper.invokeMethodSafe(boundBean, "addPropertyChangeListener", new Object[] {boundProperty, this});
boundToProperty = true;
} catch (MissingMethodException mme) {
try {
boundToProperty = false;
InvokerHelper.invokeMethodSafe(boundBean, "addPropertyChangeListener", new Object[] {this});
} catch (MissingMethodException mme2) {
throw new RuntimeException("Properties in beans of type " + bean.getClass().getName() + " are not observable in any capacity (no PropertyChangeListener support).");
}
}
}
}
public void unbind() {
if (bound) {
if (boundToProperty) {
try {
InvokerHelper.invokeMethodSafe(boundBean, "removePropertyChangeListener", new Object[] {boundProperty, this});
} catch (MissingMethodException mme) {
// ignore, too bad so sad they don't follow conventions, we'll just leave the listener attached
}
} else {
try {
InvokerHelper.invokeMethodSafe(boundBean, "removePropertyChangeListener", new Object[] {this});
} catch (MissingMethodException mme2) {
// ignore, too bad so sad they don't follow conventions, we'll just leave the listener attached
}
}
boundBean = null;
boundProperty = null;
bound = false;
}
}
public void rebind() {
if (bound) {
unbind();
bind();
}
}
}
public Object getBean() {
return bean;
}
public void setBean(Object bean) {
this.bean = bean;
}
public String getPropertyName() {
return propertyName;
}
public void setPropertyName(String propertyName) {
this.propertyName = propertyName;
}
}