/*
 * 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);
    }
}