/**
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.common;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.drools.FactHandle;
import org.drools.core.util.AbstractHashTable.ObjectComparator;
public class EqualityAssertMapComparator
implements
ObjectComparator {
/**
*
*/
private static final long serialVersionUID = 510l;
public EqualityAssertMapComparator() {
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
}
public void writeExternal(ObjectOutput out) throws IOException {
}
public int hashCodeOf(final Object obj) {
if ( obj instanceof FactHandle ) {
return rehash( ((InternalFactHandle) obj).getObjectHashCode() );
}
return rehash( obj.hashCode() );
}
public int rehash(int h) {
h += ~(h << 9);
h ^= (h >>> 14);
h += (h << 4);
h ^= (h >>> 10);
return h;
}
/**
* Special comparator that allows FactHandles to be keys, but always checks
* equals with the identity of the objects involved
*/
public boolean equal(final Object o1,
Object o2) {
if ( o1 instanceof FactHandle ) {
return o1 == o2;
}
final InternalFactHandle handle = ((InternalFactHandle) o2);
o2 = handle.getObject();
return o1 == o2 || o1.equals( o2 );
}
public int compare(final Object o1,
final Object o2) {
return ((Comparable) o1).compareTo( o2 );
}
public String toString() {
return "equality";
}
}