1 package org.apache.commons.graph.model;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.HashMap;
23 import java.util.HashSet;
24 import java.util.Map;
25 import java.util.Set;
26
27 import org.apache.commons.graph.DirectedGraph;
28 import org.apache.commons.graph.Edge;
29 import org.apache.commons.graph.Vertex;
30
31 /**
32 * A memory-based implementation of a mutable directed Graph.
33 *
34 * @param <V> the Graph vertices type
35 * @param <E> the Graph edges type
36 */
37 public class DirectedMutableGraph<V extends Vertex, E extends Edge<V>>
38 extends BaseMutableGraph<V, E>
39 implements DirectedGraph<V, E>
40 {
41
42 private final Map<V, Set<E>> inbound = new HashMap<V, Set<E>>();
43
44 /**
45 * {@inheritDoc}
46 */
47 public Set<E> getInbound( V v )
48 {
49 return inbound.get( v );
50 }
51
52 /**
53 * {@inheritDoc}
54 */
55 public Set<E> getOutbound( V v )
56 {
57 return getAdjacencyList().get( v );
58 }
59
60 /**
61 * {@inheritDoc}
62 */
63 @Override
64 protected void decorateAddVertex( V v )
65 {
66 inbound.put( v, new HashSet<E>() );
67 }
68
69 /**
70 * {@inheritDoc}
71 */
72 @Override
73 protected void decorateRemoveVertex( V v )
74 {
75 inbound.remove( v );
76 }
77
78 /**
79 * {@inheritDoc}
80 */
81 @Override
82 protected void decorateAddEdge( E e )
83 {
84 inbound.get( e.getTail() ).add( e );
85 }
86
87 /**
88 * {@inheritDoc}
89 */
90 @Override
91 protected void decorateRemoveEdge( E e )
92 {
93 inbound.get( e.getTail() ).remove( e );
94 }
95
96 }