Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/2564#discussion_r81780392
--- Diff:
flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/Projection.java
---
@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.apache.flink.graph;
+
+import org.apache.flink.api.java.tuple.Tuple4;
+
+/**
+ * Result of projection of a connection between two vertices in a
bipartite graph.
+ *
+ * @param <VK> the key type of vertices of an opposite set
+ * @param <VV> the value type of vertices of an opposite set
+ * @param <EV> the edge value type
+ */
+public class Projection<VK, VV, EV> extends Tuple4<VK, VV, EV, EV> {
+ public Projection() {}
+
+ public Projection(Vertex<VK, VV> vertex, EV edgeValue1, EV edgeValue2) {
+ this.f0 = vertex.getId();
+ this.f1 = vertex.getValue();
+ this.f2 = edgeValue1;
+ this.f3 = edgeValue2;
+ }
+
+ public VK getVertexId() {
+ return this.f0;
+ }
+
+ public VV getVertexValue() {
+ return this.f1;
+ }
+
+ public EV getEdgeValue1() {
--- End diff --
Can we now call this the "source" value (and `Value2` the "target" value??
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