/*
    * 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.giraph.edge;
  
  import com.google.common.collect.Iterables;
  import com.google.common.collect.Lists;
  import org.apache.hadoop.io.DoubleWritable;
  import org.apache.hadoop.io.LongWritable;
  import org.junit.Before;
  import org.junit.Test;
  
  import java.util.Collection;
  import java.util.List;
  
  import static org.apache.giraph.graph.TestVertexAndEdges.instantiateOutEdges;
  import static org.junit.Assert.assertEquals;
  
  /**
   * Tests {@link MultiRandomAccessOutEdges} implementations.
   */
  public class TestMultiRandomAccessEdges {
    /** {@link MultiRandomAccessOutEdges} classes to be tested. */
    private Collection<Class<? extends MultiRandomAccessOutEdges>>
        edgesClasses = Lists.newArrayList();
  
    @Before
    public void setUp() {
      edgesClasses.add(HashMultimapEdges.class);
    }
  
    /**
     * Ensures that all {@link MultiRandomAccessOutEdges} implementations
     * correctly return edge values.
     */
    @Test
    public void testParallelEdges() {
      for (Class<? extends MultiRandomAccessOutEdges> edgesClass :
          edgesClasses) {
        testParallelEdgesClass(edgesClass);
      }
    }
  
    private void testParallelEdgesClass(
        Class<? extends MultiRandomAccessOutEdges> edgesClass) {
      MultiRandomAccessOutEdges<LongWritable, DoubleWritable> edges =
          (MultiRandomAccessOutEdges<LongWritable, DoubleWritable>)
              instantiateOutEdges(edgesClass);
  
      // Initial edges list contains parallel edges.
      List<Edge<LongWritable, DoubleWritable>> initialEdges = Lists.newArrayList(
          EdgeFactory.create(new LongWritable(1), new DoubleWritable(1)),
          EdgeFactory.create(new LongWritable(2), new DoubleWritable(2)),
          EdgeFactory.create(new LongWritable(3), new DoubleWritable(3)),
          EdgeFactory.create(new LongWritable(2), new DoubleWritable(20)));
  
      edges.initialize(initialEdges);
  
      assertEquals(2,
          Iterables.size(edges.getAllEdgeValues(new LongWritable(2))));
      assertEquals(1,
          Iterables.size(edges.getAllEdgeValues(new LongWritable(1))));
      assertEquals(0,
          Iterables.size(edges.getAllEdgeValues(new LongWritable(42))));
    }
  }