[FLINK-5913] [gelly] Example drivers

Replace existing and create new algorithm Driver implementations for
each of the library methods.

This closes apache#3635

flink-libraries/flink-gelly-examples/src/main/java/org/apache/flink/graph/Usage.java

@@ -28,15 +28,13 @@ public class Usage {
 
 	private static final Class[] DRIVERS = new Class[]{
 		org.apache.flink.graph.drivers.ClusteringCoefficient.class,
-		org.apache.flink.graph.drivers.Graph500.class,
 		org.apache.flink.graph.drivers.GraphMetrics.class,
 		org.apache.flink.graph.drivers.HITS.class,
 		org.apache.flink.graph.drivers.JaccardIndex.class,
 		org.apache.flink.graph.drivers.TriangleListing.class,
 	};
 
 	private static final Class[] EXAMPLES = new Class[]{
-		org.apache.flink.graph.examples.ConnectedComponents.class,
 		org.apache.flink.graph.examples.EuclideanGraphWeighing.class,
 		org.apache.flink.graph.examples.GSASingleSourceShortestPaths.class,
 		org.apache.flink.graph.examples.IncrementalSSSP.class,

flink-libraries/flink-gelly-examples/src/main/java/org/apache/flink/graph/drivers/AdamicAdar.java

@@ -0,0 +1,71 @@
+/*
+ * 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.drivers;
+
+import org.apache.commons.lang3.text.StrBuilder;
+import org.apache.commons.lang3.text.WordUtils;
+import org.apache.flink.graph.Graph;
+import org.apache.flink.graph.drivers.output.CSV;
+import org.apache.flink.graph.drivers.output.Print;
+import org.apache.flink.graph.drivers.parameter.LongParameter;
+import org.apache.flink.graph.library.similarity.AdamicAdar.Result;
+import org.apache.flink.types.CopyableValue;
+
+import static org.apache.flink.api.common.ExecutionConfig.PARALLELISM_DEFAULT;
+
+/**
+ * Driver for {@link org.apache.flink.graph.library.similarity.AdamicAdar}.
+ */
+public class AdamicAdar<K extends CopyableValue<K>, VV, EV>
+extends SimpleDriver<Result<K>>
+implements Driver<K, VV, EV>, CSV, Print {
+
+	private LongParameter littleParallelism = new LongParameter(this, "little_parallelism")
+		.setDefaultValue(PARALLELISM_DEFAULT);
+
+	@Override
+	public String getName() {
+		return this.getClass().getSimpleName();
+	}
+
+	@Override
+	public String getShortDescription() {
+		return "similarity score weighted by centerpoint degree";
+	}
+
+	@Override
+	public String getLongDescription() {
+		return WordUtils.wrap(new StrBuilder()
+			.appendln("Adamic-Adar measures the similarity between vertex neighborhoods and is " +
+				"computed as the sum of the inverse logarithm of centerpoint degree over shared " +
+				"neighbors.")
+			.appendNewLine()
+			.append("The algorithm result contains two vertex IDs and the similarity score.")
+			.toString(), 80);
+	}
+
+	@Override
+	public void plan(Graph<K, VV, EV> graph) throws Exception {
+		int lp = littleParallelism.getValue().intValue();
+
+		result = graph
+			.run(new org.apache.flink.graph.library.similarity.AdamicAdar<K, VV, EV>()
+				.setLittleParallelism(lp));
+	}
+}