tom | e348941 | 2014-08-29 02:30:38 -0700 | [diff] [blame^] | 1 | package org.onlab.graph; |
| 2 | |
| 3 | import java.util.Objects; |
| 4 | |
| 5 | import static com.google.common.base.Preconditions.checkNotNull; |
| 6 | |
| 7 | /** |
| 8 | * Abstract graph edge implementation. |
| 9 | */ |
| 10 | public abstract class AbstractEdge<V extends Vertex> implements Edge<V> { |
| 11 | |
| 12 | private final V src; |
| 13 | private final V dst; |
| 14 | |
| 15 | /** |
| 16 | * Creates a new edge between the specified source and destination vertexes. |
| 17 | * |
| 18 | * @param src source vertex |
| 19 | * @param dst destination vertex |
| 20 | */ |
| 21 | public AbstractEdge(V src, V dst) { |
| 22 | this.src = checkNotNull(src, "Source vertex cannot be null"); |
| 23 | this.dst = checkNotNull(dst, "Destination vertex cannot be null"); |
| 24 | } |
| 25 | |
| 26 | @Override |
| 27 | public V src() { |
| 28 | return src; |
| 29 | } |
| 30 | |
| 31 | @Override |
| 32 | public V dst() { |
| 33 | return dst; |
| 34 | } |
| 35 | |
| 36 | @Override |
| 37 | public int hashCode() { |
| 38 | return Objects.hash(src, dst); |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public boolean equals(Object obj) { |
| 43 | if (obj instanceof AbstractEdge) { |
| 44 | final AbstractEdge other = (AbstractEdge) obj; |
| 45 | return Objects.equals(this.src, other.src) && Objects.equals(this.dst, other.dst); |
| 46 | } |
| 47 | return false; |
| 48 | } |
| 49 | |
| 50 | @Override |
| 51 | public String toString() { |
| 52 | return com.google.common.base.Objects.toStringHelper(this) |
| 53 | .add("src", src) |
| 54 | .add("dst", dst) |
| 55 | .toString(); |
| 56 | } |
| 57 | } |