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/*
* Copyright 2014 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 com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableList;
import org.onosproject.net.provider.ProviderId;
import java.util.List;
import java.util.Objects;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Default implementation of a network path.
*/
public class DefaultPath extends DefaultLink implements Path {
private final List<Link> links;
private final double cost;
/**
* Creates a path from the specified source and destination using the
* supplied list of links.
*
* @param providerId provider identity
* @param links contiguous links that comprise the path
* @param cost unit-less path cost
* @param annotations optional key/value annotations
*/
public DefaultPath(ProviderId providerId, List<Link> links, double cost,
Annotations... annotations) {
super(providerId, source(links), destination(links), Type.INDIRECT, annotations);
this.links = ImmutableList.copyOf(links);
this.cost = cost;
}
@Override
public List<Link> links() {
return links;
}
@Override
public double cost() {
return cost;
}
// Returns the source of the first link.
private static ConnectPoint source(List<Link> links) {
checkNotNull(links, "List of path links cannot be null");
checkArgument(!links.isEmpty(), "List of path links cannot be empty");
return links.get(0).src();
}
// Returns the destination of the last link.
private static ConnectPoint destination(List<Link> links) {
checkNotNull(links, "List of path links cannot be null");
checkArgument(!links.isEmpty(), "List of path links cannot be empty");
return links.get(links.size() - 1).dst();
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("src", src())
.add("dst", dst())
.add("type", type())
.add("state", state())
.add("durable", isDurable())
.add("links", links)
.add("cost", cost)
.toString();
}
@Override
public int hashCode() {
return links.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof DefaultPath) {
final DefaultPath other = (DefaultPath) obj;
return Objects.equals(this.links, other.links);
}
return false;
}
}
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