/*
 * Copyright (c) 2002-2006 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o 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. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS 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 COPYRIGHT OWNER OR 
 * 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. 
 */

package com.jgoodies.binding.tests.event;

import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/**
 * A ListDataListener that stores the received ListDataEvents.
 * 
 * @author  Karsten Lentzsch
 * @version $Revision: 1.4 $
 */
public final class ListSelectionReport implements ListSelectionListener {
    
    /**
     * Holds a list of all received ListDataEvents.
     */
    private List allEvents = new LinkedList();
    
    
    // Implementing the ListSelectionListener Interface ***************************
    
    /** 
     * Called whenever the value of the selection changes.
     * 
     * @param evt the event that characterizes the change.
     */
    public void valueChanged(ListSelectionEvent evt) {
        allEvents.add(0, evt);
    }

    
    // Public Report API *****************************************************
    
    public ListSelectionEvent lastEvent() {
        return allEvents.isEmpty()
            ? null
            : (ListSelectionEvent) allEvents.get(0);
    }
    
    public List eventList() {
        return allEvents;
    }

    public int eventCount() {
        return allEvents.size();
    }
    
    public boolean hasEvents() {
        return !allEvents.isEmpty();
    }
    
    
    // ************************************************************************
    
    /**
     * Compares this report's event list with the event list
     * of the given object and ignores the source of the contained
     * ListDataEvents that may differ.
     * 
     * @param o   the object to compare with
     * @return true if equal, false if not
     * 
     * @see java.util.AbstractList#equals(Object)
     */
    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (!(o instanceof ListSelectionReport))
            return false;

        ListIterator e1 = eventList().listIterator();
        ListIterator e2 = ((ListSelectionReport) o).eventList().listIterator();
        while (e1.hasNext() && e2.hasNext()) {
            ListSelectionEvent evt1 = (ListSelectionEvent) e1.next();
            ListSelectionEvent evt2 = (ListSelectionEvent) e2.next();
            if (!equalListDataEvents(evt1, evt2))
                return false;
        }
        return !(e1.hasNext() || e2.hasNext());
    }
    
    /**
     * Poor but valid implementation. Won't be used.
     * 
     * @return this report's hash code
     */
    public int hashCode() {
        return eventList().size();
    }
    
    
    /**
     * Checks and answers whether the two given ListSelectionEvents have 
     * the same first and last index. The source and adjusting state may differ.
     */
    private boolean equalListDataEvents(ListSelectionEvent evt1, ListSelectionEvent evt2) {
        return evt1.getFirstIndex() == evt2.getFirstIndex()
             && evt1.getLastIndex() == evt2.getLastIndex();
    }

    
}
