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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.StringUtil;
import com.rapiddweller.common.bean.ObservableBean;
import com.rapiddweller.common.converter.ToStringConverter;

import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

/**
 * {@link JTextField} implementation that serves as delegate of a property of a JavaBean object.
 * Created at 17.07.2008 14:38:14
 *
 * @author Volker Bergmann
 * @since 0.5.13
 */
public class PropertyTextField extends JTextField {

  /**
   * uid for serialization
   */
  private static final long serialVersionUID = -6986676080916477887L;

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

  private final Object bean;
  private final String propertyName;

  private final ToStringConverter toStringConverter;
  /**
   * The Locked.
   */
  boolean locked;

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

  /**
   * Instantiates a new Property text field.
   *
   * @param bean         the bean
   * @param propertyName the property name
   * @param length       the length
   */
  public PropertyTextField(Object bean, String propertyName, int length) {
    super(length);
    this.bean = bean;
    this.propertyName = propertyName;
    this.toStringConverter = new ToStringConverter();
    this.locked = true;
    Listener listener = new Listener();
    if (bean instanceof ObservableBean) {
      ((ObservableBean) bean).addPropertyChangeListener(propertyName, listener);
    }
    this.getDocument().addDocumentListener(listener);
    this.locked = false;
    refresh();
  }

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

  /**
   * reads the current property value and writes it to the text field.
   */
  void refresh() {
    if (!locked) {
      locked = true;
      Object propertyValue = BeanUtil.getPropertyValue(bean, propertyName);
      String text = toStringConverter.convert(propertyValue);
      text = StringUtil.escape(text);
      if (!getText().equals(text)) {
        setText(text);
      }
      locked = false;
    }
  }

  /**
   * writes the current text field content to the property.
   */
  void update() {
    if (!locked) {
      locked = true;
      Document document = getDocument();
      String text;
      try {
        text = document.getText(0, document.getLength());
      } catch (BadLocationException e) {
        throw new RuntimeException(e);
      }
      text = StringUtil.unescape(text);
      if (!text.equals(BeanUtil.getPropertyValue(bean, propertyName))) {
        BeanUtil.setPropertyValue(bean, propertyName, text);
      }
      locked = false;
    }
  }

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

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

    @Override
    public void changedUpdate(DocumentEvent evt) {
      update();
    }

    @Override
    public void insertUpdate(DocumentEvent evt) {
      update();
    }

    @Override
    public void removeUpdate(DocumentEvent evt) {
      update();
    }

  }
}