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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onosproject.net;
import org.onosproject.net.provider.ProviderId;
import java.util.List;
import java.util.Objects;
import static com.google.common.collect.ImmutableSet.of;
/**
* Default implementation of a network disjoint path pair.
*/
public class DefaultDisjointPath extends DefaultPath implements DisjointPath {
private final DefaultPath path1;
private final DefaultPath path2;
boolean usingPath1 = true;
/**
* Creates a disjoint path pair from two default paths.
*
* @param providerId provider identity
* @param path1 primary path
* @param path2 backup path
*/
public DefaultDisjointPath(ProviderId providerId, DefaultPath path1, DefaultPath path2) {
super(providerId, path1.links(), path1.cost() + path2.cost());
this.path1 = path1;
this.path2 = path2;
}
@Override
public List<Link> links() {
if (usingPath1) {
return path1.links();
} else {
return path2.links();
}
}
@Override
public double cost() {
if (usingPath1) {
return path1.cost();
}
return path2.cost();
}
@Override
public Path primary() {
return path1;
}
@Override
public Path backup() {
return path2;
}
@Override
public int hashCode() {
return Objects.hash(of(path1, path2), src(), dst());
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof DefaultDisjointPath) {
final DefaultDisjointPath other = (DefaultDisjointPath) obj;
return Objects.equals(this.path1, other.path1) && Objects.equals(this.path2, other.path2);
}
return false;
}
@Override
public boolean useBackup() {
if (path2 == null || path2.links() == null) {
return false;
}
usingPath1 = !usingPath1;
return true;
}
}
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