/*
    * 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.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;
  import static org.junit.Assert.assertNull;
  
  /**
   * Tests {@link StrictRandomAccessOutEdges} implementations.
   */
  public class TestStrictRandomAccessEdges {
      /** {@link StrictRandomAccessOutEdges} classes to be tested. */
      private Collection<Class<? extends StrictRandomAccessOutEdges>>
          edgesClasses = Lists.newArrayList();
  
      @Before
      public void setUp() {
        edgesClasses.add(HashMapEdges.class);
        edgesClasses.add(LongDoubleHashMapEdges.class);
      }
  
      /**
       * Ensures that all {@link StrictRandomAccessOutEdges} implementations
       * correctly return edge values.
       */
      @Test
      public void testParallelEdges() {
        for (Class<? extends StrictRandomAccessOutEdges> edgesClass :
            edgesClasses) {
          testParallelEdgesClass(edgesClass);
        }
      }
  
      private void testParallelEdgesClass(
          Class<? extends StrictRandomAccessOutEdges> edgesClass) {
        StrictRandomAccessOutEdges<LongWritable, DoubleWritable> edges =
            (StrictRandomAccessOutEdges<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(3.0, edges.getEdgeValue(new LongWritable(3)).get(), 0.0);
        assertNull(edges.getEdgeValue(new LongWritable(55)));
  
        edges.setEdgeValue(new LongWritable(2), new DoubleWritable(33.0));
        assertEquals(33.0, edges.getEdgeValue(new LongWritable(2)).get(), 0);
      }
  }