blob: fb0b281c6cf647a29680c878750be4eac56e62bb [file] [log] [blame]
package org.onlab.onos.net;
import com.google.common.collect.ImmutableList;
import org.onlab.onos.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 int hashCode() {
return Objects.hash(links);
}
@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;
}
}