org.drools.core.conflict.PhreakConflictResolver Maven / Gradle / Ivy
/*
* Copyright 2010 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;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
public class PhreakConflictResolver
implements
ConflictResolver, Externalizable {
private static final long serialVersionUID = 510l;
public static final PhreakConflictResolver INSTANCE = new PhreakConflictResolver();
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
}
public void writeExternal(ObjectOutput out) throws IOException {
}
public static ConflictResolver getInstance() {
return PhreakConflictResolver.INSTANCE;
}
public final int compare(final Activation existing,
final Activation adding) {
return doCompare( existing, adding );
}
public final static int doCompare(final Activation existing,
final Activation adding) {
if (existing == adding) {
return 0;
}
final int s1 = existing.getSalience();
final int s2 = adding.getSalience();
return s1 != s2 ?
( s1 > s2 ? 1 : -1 ) : // highest salience goes first (cannot do s1-s2 due to overflow)
adding.getRule().getLoadOrder() - existing.getRule().getLoadOrder(); // lowest order goes first
}
}