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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.CollectionUtil;
import com.rapiddweller.common.bean.ObservableBean;
import com.rapiddweller.common.ui.I18NSupport;
import com.rapiddweller.common.ui.swing.FileList;

import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.util.List;

/**
 * {@link FileList} implementation that serves as delegate of a property of a JavaBean object.
 * Created at 30.11.2008 15:06:20
 *
 * @author Volker Bergmann
 * @since 0.5.13
 */
public class PropertyFileList extends FileList {

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

  private static final long serialVersionUID = -1259803129031396860L;

  private final Object bean;
  private final String propertyName;

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

  // constructor -----------------------------------------------------------------------------------------------------

  /**
   * Instantiates a new Property file list.
   *
   * @param bean         the bean
   * @param propertyName the property name
   * @param i18n         the 18 n
   */
  public PropertyFileList(Object bean, String propertyName, I18NSupport i18n) {
    super(i18n);
    this.bean = bean;
    this.propertyName = propertyName;
    this.locked = true;
    refresh();
    Listener listener = new Listener();
    model.addListDataListener(listener);
    if (bean instanceof ObservableBean) {
      ((ObservableBean) bean).addPropertyChangeListener(propertyName, listener);
    }
    this.locked = false;
  }

  // event handlers --------------------------------------------------------------------------------------------------

  /**
   * reads the current property value and writes it to the file list.
   */
  void refresh() {
    if (!locked) {
      locked = true;
      Object propertyValue = BeanUtil.getPropertyValue(bean, propertyName);
      File[] files = (File[]) propertyValue;
      if (!CollectionUtil.ofEqualContent(getFiles(), files)) {
        setFiles(files);
      }
      locked = false;
    }
  }

  /**
   * writes the current file field content to the property.
   */
  void update() {
    if (!locked) {
      locked = true;
      File[] modelFiles = (File[]) BeanUtil.getPropertyValue(bean, propertyName);
      List viewFiles = getFiles();
      if (!CollectionUtil.ofEqualContent(viewFiles, modelFiles)) {
        File[] files = CollectionUtil.toArray(viewFiles, File.class);
        BeanUtil.setPropertyValue(bean, propertyName, files);
      }
      locked = false;
    }
  }

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

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

    @Override
    public void contentsChanged(ListDataEvent evt) {
      update();
    }

    @Override
    public void intervalAdded(ListDataEvent evt) {
      update();
    }

    @Override
    public void intervalRemoved(ListDataEvent evt) {
      update();
    }

  }
}