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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 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 com.rapiddweller.common.ui.swing.delegate;

import com.rapiddweller.common.BeanUtil;
import com.rapiddweller.common.NullSafeComparator;
import com.rapiddweller.common.bean.ObservableBean;
import com.rapiddweller.common.ui.FileOperation;
import com.rapiddweller.common.ui.FileTypeSupport;
import com.rapiddweller.common.ui.swing.FileField;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;

/**
 * {@link FileField} implementation that serves as delegate of a property of a JavaBean object.
 * Created at 30.11.2008 00:22:14
 *
 * @author Volker Bergmann
 * @since 0.5.13
 */
public class PropertyFileField extends FileField {

  // attributes ------------------------------------------------------------------------------------------------------

  private static final long serialVersionUID = -3970525222511845399L;

  private Object bean;
  private String propertyName;

  /**
   * The Locked.
   */
  boolean locked;

  // constructors ----------------------------------------------------------------------------------------------------

  /**
   * Instantiates a new Property file field.
   *
   * @param bean         the bean
   * @param propertyName the property name
   * @param length       the length
   * @param typeSupport  the type support
   * @param operation    the operation
   */
  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;
    }
  }

  /**
   * The type Listener.
   */
  class Listener implements PropertyChangeListener, ActionListener {

    @Override
    public void propertyChange(PropertyChangeEvent evt) {
      refresh();
    }

    @Override
    public void actionPerformed(ActionEvent evt) {
      update();
    }

  }
}