/*
 * 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;

import junit.framework.TestCase;

import com.jgoodies.binding.tests.event.PropertyChangeReport;
import com.jgoodies.binding.value.ValueHolder;
import com.jgoodies.binding.value.ValueModel;

/**
 * Tests old and new values when the bean, value or subject changes in 
 * BeanAdapter, PropertyAdapter, PresentationModel and BufferedValueModel.
 * 
 * @author  Karsten Lentzsch
 * @version $Revision: 1.5 $
 */
public final class ValueHolderTest extends TestCase {
    

    // Public Tests ***********************************************************
    
    public void testEquityTestingHolderSendsProperEvents() {
        ValueHolder holder = new ValueHolder();
        
        Object obj1  = new Integer(1);
        Object obj2a = new Integer(2);
        Object obj2b = new Integer(2);
        testValueChangeSendsProperEvent(holder, null, obj1,   true);
        testValueChangeSendsProperEvent(holder, obj1, null,   true);
        testValueChangeSendsProperEvent(holder, obj1, obj1,   false);
        testValueChangeSendsProperEvent(holder, obj1, obj2a,  true);
        testValueChangeSendsProperEvent(holder, obj2a, obj2b, false); // equals
        testValueChangeSendsProperEvent(holder, null, null,   false);
    }

    
    public void testIdentityTestingHolderSendsProperEvents() {
        ValueHolder holder = new ValueHolder(null, true);
        
        Object obj1  = new Integer(1);
        Object obj2a = new Integer(2);
        Object obj2b = new Integer(2);
        testValueChangeSendsProperEvent(holder, null, obj1,   true);
        testValueChangeSendsProperEvent(holder, obj1, null,   true);
        testValueChangeSendsProperEvent(holder, obj1, obj1,   false);
        testValueChangeSendsProperEvent(holder, obj1, obj2a,  true);
        testValueChangeSendsProperEvent(holder, obj2a, obj2b, true); // !=
        testValueChangeSendsProperEvent(holder, null, null,   false);
    }
    

    // Test Implementations ***************************************************
    
    private void testValueChangeSendsProperEvent(
            ValueModel valueModel, Object oldValue, Object newValue, boolean eventExpected) {
        valueModel.setValue(oldValue);
        PropertyChangeReport changeReport = new PropertyChangeReport();
        valueModel.addValueChangeListener(changeReport);
        int expectedEventCount = eventExpected ? 1 : 0;
        
        valueModel.setValue(newValue);
        assertEquals(
                "Expected event count after ( " 
              + oldValue + " -> " + newValue + ").", 
                expectedEventCount, 
                changeReport.eventCount());
        if (eventExpected) {
            assertEquals("Event's old value.", oldValue, changeReport.lastEvent().getOldValue());
            assertEquals("Event's new value.", newValue, changeReport.lastEvent().getNewValue());
        }
    }
    
    
}
