/*******************************************************************************
* Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.utility.diff;
import java.util.Map;
import org.eclipse.persistence.tools.workbench.utility.string.StringTools;
/**
* This differentiator compares two map entries.
* The two entries are "identical" if their keys and values are
* both "identical". This applies to both #keyDiff(Object, Object)
* and #diff(Object, Object).
*/
public class MapEntryDifferentiator implements Differentiator {
private Differentiator keyDifferentiator;
private Differentiator valueDifferentiator;
/**
* default to "equality" differentiators for both the key and the value
*/
public MapEntryDifferentiator() {
this(EqualityDifferentiator.instance(), EqualityDifferentiator.instance());
}
public MapEntryDifferentiator(Differentiator keyDifferentiator, Differentiator valueDifferentiator) {
super();
this.keyDifferentiator = keyDifferentiator;
this.valueDifferentiator = valueDifferentiator;
}
/**
* @see Differentiator#diff(Object, Object)
*/
public Diff diff(Object object1, Object object2) {
return this.diff(object1, object2, DifferentiatorAdapter.NORMAL);
}
/**
* @see Differentiator#keyDiff(Object, Object)
*/
public Diff keyDiff(Object object1, Object object2) {
return this.diff(object1, object2, DifferentiatorAdapter.KEY);
}
private Diff diff(Object object1, Object object2, DifferentiatorAdapter adapter) {
if ((object1 == null) || (object2 == null)) {
// both arguments should be map entries
throw new NullPointerException();
}
Map.Entry entry1 = (Map.Entry) object1;
Map.Entry entry2 = (Map.Entry) object2;
Diff keyDiff = adapter.diff(this.keyDifferentiator, entry1.getKey(), entry2.getKey());
Diff valueDiff = adapter.diff(this.valueDifferentiator, entry1.getValue(), entry2.getValue());
return new MapEntryDiff(entry1, entry2, keyDiff, valueDiff, this);
}
/**
* map entries should only belong to a single map
* @see Differentiator#comparesValueObjects()
*/
public boolean comparesValueObjects() {
return false;
}
public Differentiator getKeyDifferentiator() {
return this.keyDifferentiator;
}
public void setKeyDifferentiator(Differentiator keyDifferentiator) {
this.keyDifferentiator = keyDifferentiator;
}
public Differentiator getValueDifferentiator() {
return this.valueDifferentiator;
}
public void setValueDifferentiator(Differentiator valueDifferentiator) {
this.valueDifferentiator = valueDifferentiator;
}
/**
* @see Object#toString()
*/
public String toString() {
return StringTools.buildToStringFor(this, this.valueDifferentiator);
}
}