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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* 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.databene.commons.ui.swing.delegate;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import org.databene.commons.BeanUtil;
import org.databene.commons.NullSafeComparator;
import org.databene.commons.bean.ObservableBean;
import org.databene.commons.ui.FileOperation;
import org.databene.commons.ui.FileTypeSupport;
import org.databene.commons.ui.swing.FileField;
/**
* {@link FileField} implementation that serves as delegate of a property of a JavaBean object.
*
* Created at 30.11.2008 00:22:14
* @since 0.5.13
* @author Volker Bergmann
*/
public class PropertyFileField extends FileField {
// attributes ------------------------------------------------------------------------------------------------------
private static final long serialVersionUID = -3970525222511845399L;
private Object bean;
private String propertyName;
boolean locked;
// constructors ----------------------------------------------------------------------------------------------------
public PropertyFileField(Object bean, String propertyName, int length, FileTypeSupport typeSupport, FileOperation operation) {
super(length, null, typeSupport, operation);
init(bean, propertyName);
}
private void init(Object bean, String propertyName) {
this.bean = bean;
this.propertyName = propertyName;
this.locked = true;
refresh();
Listener listener = new Listener();
if (bean instanceof ObservableBean)
((ObservableBean) bean).addPropertyChangeListener(propertyName, listener);
this.addActionListener(listener);
this.locked = false;
File value = (File) BeanUtil.getPropertyValue(bean, propertyName);
if (value != null)
setFile(value);
}
// event handlers --------------------------------------------------------------------------------------------------
/**
* reads the current property value and writes it to the file field.
*/
void refresh() {
if (!locked) {
locked = true;
Object propertyValue = BeanUtil.getPropertyValue(bean, propertyName);
File file = (File) propertyValue;
if (!NullSafeComparator.equals(getFile(), file))
setFile(file);
locked = false;
}
}
/**
* writes the current file field content to the property.
*/
void update() {
if (!locked) {
locked = true;
File file = getFile();
if (!NullSafeComparator.equals(file, BeanUtil.getPropertyValue(bean, propertyName)))
BeanUtil.setPropertyValue(bean, propertyName, file);
locked = false;
}
}
class Listener implements PropertyChangeListener, ActionListener {
@Override
public void propertyChange(PropertyChangeEvent evt) {
refresh();
}
@Override
public void actionPerformed(ActionEvent evt) {
update();
}
}
}