org.drools.core.time.TemporalDependencyMatrix 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.time;
import java.util.List;
import java.util.stream.IntStream;
import org.drools.core.rule.Pattern;
import static org.drools.core.rule.TypeDeclaration.NEVER_EXPIRES;
/**
* A class to abstract the management of temporal
* dependency management information
*/
public class TemporalDependencyMatrix {
private Interval[][] matrix;
private List events;
public TemporalDependencyMatrix(Interval[][] matrix,
List events) {
super();
this.matrix = matrix;
this.events = events;
}
public Interval[][] getMatrix() {
return matrix;
}
public void setMatrix(Interval[][] matrix) {
this.matrix = matrix;
}
public List getEvents() {
return events;
}
public void setEvents(List events) {
this.events = events;
}
public long getExpirationOffset(Pattern pattern) {
int index = events.indexOf( pattern );
Interval[] intervals = matrix[index];
long expiration = IntStream.range( 0, intervals.length )
.filter( i -> i != index ) // skip values on the diagonal
.mapToLong( i -> intervals[i].getUpperBound() )
.max().orElse( NEVER_EXPIRES );
return expiration >= 0 && expiration != Long.MAX_VALUE ? expiration+1 : NEVER_EXPIRES;
}
}