/*
    * 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.aggregators.matrix.dense;
  
  import org.apache.giraph.aggregators.matrix.dense.LongDenseVector;
  import static org.junit.Assert.assertEquals;
  
  import org.apache.giraph.utils.WritableUtils;
  import org.junit.Test;
  
  public class TestLongDenseMatrix {
  
    @Test
    public void testVectorSingleton() {
      LongDenseVector vec1 = new LongDenseVector(10);
      vec1.set(0, 1);
      vec1.set(6, 14);
  
      LongDenseVector vec2 = new LongDenseVector();
      vec2.setSingleton(6, 10);
      vec1.add(vec2);
      assertEquals(24, vec1.get(6));
  
      vec2.setSingleton(15, 15);
      vec1.add(vec2);
      assertEquals(15, vec1.get(15));
    }
  
    @Test
    public void testVectorAdd() {
      // The default value should be 0
      LongDenseVector vec1 = new LongDenseVector(10);
      assertEquals(0, vec1.get(0));
  
      // Basic get/set
      vec1.set(0, 1);
      vec1.set(6, 14);
      assertEquals(1, vec1.get(0));
      assertEquals(0, vec1.get(4));
      assertEquals(14, vec1.get(6));
      assertEquals(0, vec1.get(15));
  
      // Add another vector
      LongDenseVector vec2 = new LongDenseVector(20);
      vec2.set(0, 5);
      vec2.set(5, 17);
  
      vec1.add(vec2);
      assertEquals(6, vec1.get(0));
      assertEquals(17, vec1.get(5));
      assertEquals(14, vec1.get(6));
      assertEquals(0, vec1.get(15));
    }
  
    @Test
    public void testVectorSerialize() throws Exception {
      int size = 100;
  
      // Serialize from
      LongDenseVector from = new LongDenseVector(size);
      from.set(0, 100);
      from.set(10, 50);
      from.set(12, 10);
      byte[] data = WritableUtils.writeToByteArray(from, from);
  
      // De-serialize to
      LongDenseVector to1 = new LongDenseVector();
      LongDenseVector to2 = new LongDenseVector();
      WritableUtils.readFieldsFromByteArray(data, to1, to2);
  
      // The vectors should be equal
      for (int i = 0; i < size; ++i) {
        assertEquals(from.get(i), to1.get(i));
        assertEquals(from.get(i), to2.get(i));
      }
    }
  
    @Test
    public void testVectorSerializeSingleton() throws Exception {
      LongDenseVector from = new LongDenseVector();
      from.setSingleton(3, 10);
  
      byte[] data = WritableUtils.writeToByteArray(from, from);
 
     LongDenseVector to1 = new LongDenseVector();
     LongDenseVector to2 = new LongDenseVector();
     WritableUtils.readFieldsFromByteArray(data, to1, to2);
 
     assertEquals(from.getSingletonIndex(), to1.getSingletonIndex());
     assertEquals(from.getSingletonIndex(), to2.getSingletonIndex());
     assertEquals(from.getSingletonValue(), to2.getSingletonValue());
     assertEquals(from.getSingletonValue(), to2.getSingletonValue());
   }
 }