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Cayenne Object Persistence Framework
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/* ====================================================================
*
* The ObjectStyle Group Software License, version 1.1
* ObjectStyle Group - http://objectstyle.org/
* 
* Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
* of the software. All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
* 
* 3. The end-user documentation included with the redistribution, if any,
*    must include the following acknowlegement:
*    "This product includes software developed by independent contributors
*    and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
*    Alternately, this acknowlegement may appear in the software itself,
*    if and wherever such third-party acknowlegements normally appear.
* 
* 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
*    or promote products derived from this software without prior written
*    permission. For written permission, email
*    "andrus at objectstyle dot org".
* 
* 5. Products derived from this software may not be called "ObjectStyle"
*    or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
*    names without prior written permission.
* 
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
* 
* This software consists of voluntary contributions made by many
* individuals and hosted on ObjectStyle Group web site.  For more
* information on the ObjectStyle Group, please see
* .
*/
package org.objectstyle.cayenne.dataview;

import javax.swing.ComboBoxModel;

import org.objectstyle.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());
    }
}