| 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 |
| */ |
| public DefaultPath(ProviderId providerId, List<Link> links, double cost) { |
| super(providerId, source(links), destination(links), Type.INDIRECT); |
| 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; |
| } |
| } |