enterprise/j2ee.sun.ddui/src/org/netbeans/modules/j2ee/sun/ddloaders/multiview/MappingComboBoxHelper.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.netbeans.modules.j2ee.sun.ddloaders.multiview;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComboBox;
import org.netbeans.modules.j2ee.sun.share.configbean.customizers.common.TextMapping;
import org.netbeans.modules.xml.multiview.Refreshable;
import org.netbeans.modules.xml.multiview.XmlMultiViewDataSynchronizer;

/**
 * Handles combobox refreshing via TextMapping and other Mapping data models used
 * by sun dd multiview editor backend.
 * 
 * @author Peter Williams
 */
public abstract class MappingComboBoxHelper implements ActionListener, Refreshable {
    
    private XmlMultiViewDataSynchronizer synchronizer;
    private JComboBox comboBox;

    /**
     * Constructor initializes object by combo box and data object which will be handled
     *
     * @param synchronizer
     * @param comboBox   handled JComboBox.
     */
    public MappingComboBoxHelper(XmlMultiViewDataSynchronizer synchronizer, JComboBox comboBox) {
        this.synchronizer = synchronizer;
        this.comboBox = comboBox;
        comboBox.addActionListener(this);
        setValue(getItemValue());
    }

    /**
     * Invoked when an action occurs on a combo box.
     */
    public final void actionPerformed(ActionEvent e) {
        final TextMapping value = (TextMapping) comboBox.getSelectedItem();
        if (value == null || !value.equals(getItemValue())) {
            setItemValue(value);
            synchronizer.requestUpdateData();
        }
    }

    /**
     * Selects the item value in combo box.
     *
     * @param itemValue value of item to be selected in combo box
     */
    public void setValue(TextMapping itemValue) {
        comboBox.setSelectedItem(itemValue);
    }

    /**
     * Combo box getter
     *
     * @return handled combo box
     */
    public JComboBox getComboBox() {
        return comboBox;
    }

    /**
     * Retrieves the text value selected in the combo box.
     *
     * @return selected item of the combo box
     */
    public TextMapping getValue() {
        return (TextMapping) comboBox.getSelectedItem();
    }

    /**
     * Called by the helper in order to retrieve the value of the item.
     *
     * @return value of the handled item.
     */
    public abstract TextMapping getItemValue();

    /**
     * Called by the helper in order to set the value of the item
     *
     * @param value new value of the hanlded item
     */
    public abstract void setItemValue(TextMapping value);

    public void refresh() {
        setValue(getItemValue());
    }
}