org.drools.core.conflict.SequentialConflictResolver Maven / Gradle / Ivy
/*
* Copyright 2005 Red Hat, Inc. and/or its affiliates.
*
* 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.core.conflict;
import org.drools.core.spi.Activation;
import org.drools.core.spi.ConflictResolver;
/**
* ConflictResolver that uses the loadOrder of rules to resolve
* conflict.
*
* @see #getInstance
* @see org.kie.rule.Rule#getLoadOrder
*
*
* @version $Id: LoadOrderConflictResolver.java,v 1.1 2004/06/25 01:55:16
* mproctor Exp $
*/
public class SequentialConflictResolver extends AbstractConflictResolver {
// ----------------------------------------------------------------------
// Class members
// ----------------------------------------------------------------------
private static final long serialVersionUID = 510l;
/** Singleton instance. */
private static final SequentialConflictResolver INSTANCE = new SequentialConflictResolver();
// ----------------------------------------------------------------------
// Class methods
// ----------------------------------------------------------------------
/**
* Retrieve the singleton instance.
*
* @return The singleton instance.
*/
public static ConflictResolver getInstance() {
return SequentialConflictResolver.INSTANCE;
}
// ----------------------------------------------------------------------
// Constructors
// ----------------------------------------------------------------------
/**
* Construct.
*/
public SequentialConflictResolver() {
// intentionally left blank
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
public final int compare(final Activation existing,
final Activation adding) {
final int s1 = existing.getSalience();
final int s2 = adding.getSalience();
if ( s1 > s2 ) {
return 1;
} else if ( s1 < s2 ) {
return -1;
}
return (int) (existing.getRule().getLoadOrder() - adding.getRule().getLoadOrder());
}
}