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Cayenne Object Persistence Framework

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/*****************************************************************
 *   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.
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package org.apache.cayenne.dataview;

import javax.swing.ComboBoxModel;

import org.apache.cayenne.DataObject;

/**
 * A ComboBoxModel to display DataObjects.
 * 
 * @since 1.1
 * @author Andriy Shapochka
 */
public class DOComboBoxModel extends DOListModel implements ComboBoxModel {

    protected DataObject selectedObject;

    public DOComboBoxModel() {
    }

    public void setSelectedDataObject(DataObject dataObject) {
        if ((selectedObject != null && !selectedObject.equals(dataObject))
                || selectedObject == null
                && dataObject != null) {
            selectedObject = dataObject;
            fireContentsChanged(this, -1, -1);
        }
    }

    public DataObject getSelectedDataObject() {
        return selectedObject;
    }

    public void setSelectedItem(Object selectedValue) {
        if (viewField == null) {
            if (selectedValue instanceof DataObject)
                setSelectedDataObject((DataObject) selectedValue);
            else
                setSelectedDataObject(null);
        }
        else {
            LookupCache cache = viewField.getOwner().getOwner().getLookupCache();
            setSelectedDataObject(cache.getDataObject(viewField, selectedValue));
        }
    }

    public Object getSelectedItem() {
        if (viewField == null)
            return getSelectedDataObject();
        return viewField.getValue(getSelectedDataObject());
    }
}