1 files changed, 59 insertions, 0 deletions
diff --git a/framework/src/onos/utils/misc/src/main/java/org/onlab/graph/Graph.java b/framework/src/onos/utils/misc/src/main/java/org/onlab/graph/Graph.java
new file mode 100644
index 00000000..bc7853ec
--- /dev/null
+++ b/framework/src/onos/utils/misc/src/main/java/org/onlab/graph/Graph.java
@@ -0,0 +1,59 @@
+/*
+ * 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.onlab.graph;
+
+
+import java.util.Set;
+
+/**
+ * Abstraction of a directed graph structure.
+ *
+ * @param <V> vertex type
+ * @param <E> edge type
+ */
+public interface Graph<V extends Vertex, E extends Edge> {
+
+    /**
+     * Returns the set of vertexes comprising the graph.
+     *
+     * @return set of vertexes
+     */
+    Set<V> getVertexes();
+
+    /**
+     * Returns the set of edges comprising the graph.
+     *
+     * @return set of edges
+     */
+    Set<E> getEdges();
+
+    /**
+     * Returns all edges leading out from the specified source vertex.
+     *
+     * @param src source vertex
+     * @return set of egress edges; empty if no such edges
+     */
+    Set<E> getEdgesFrom(V src);
+
+    /**
+     * Returns all edges leading towards the specified destination vertex.
+     *
+     * @param dst destination vertex
+     * @return set of ingress vertexes; empty if no such edges
+     */
+    Set<E> getEdgesTo(V dst);
+
+}