/*
* ====================================================================
*
* The ObjectStyle Group Software License, Version 1.0
*
* Copyright (c) 2006 The ObjectStyle Group 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 the ObjectStyle Group (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, please contact andrus@objectstyle.org.
*
* 5. Products derived from this software may not be called "ObjectStyle" nor
* may "ObjectStyle" appear in their names without prior written permission of
* the ObjectStyle Group.
*
* 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
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals on
* behalf of the ObjectStyle Group. For more information on the ObjectStyle
* Group, please see <http://objectstyle.org/>.
*
*/
package org.objectstyle.wolips.eomodeler.core.kvc;
import java.util.Comparator;
public class KVCComparator<T> implements Comparator<T> {
private KeyPath _keyPath;
public KVCComparator(Class<T> clazz, String keyPath) {
_keyPath = new ResolvedKeyPath(clazz, keyPath);
}
public KVCComparator(String keyPath) {
_keyPath = new KeyPath(keyPath);
}
public int compare(Object o1, Object o2) {
try {
Object value1 = _keyPath.getValue(o1);
Object value2 = _keyPath.getValue(o2);
int results;
if (value1 == null) {
if (value2 == null) {
results = 0;
} else if (value2 instanceof Comparable) {
results = 1;
} else {
throw new IllegalArgumentException(_keyPath + " did not return a comparable value from " + o2);
}
} else if (value2 == null) {
results = -1;
} else if (value1 instanceof Comparable) {
results = ((Comparable) value1).compareTo(value2);
} else {
throw new IllegalArgumentException(_keyPath + " did not return a comparable value from " + o1);
}
return results;
} catch (Throwable t) {
throw new RuntimeException("Failed to retrieve value of " + _keyPath + " on " + o1 + " or " + o2 + ".", t);
}
}
}