/*
    * 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.utils;
  
  import org.apache.hadoop.io.FloatWritable;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.io.Writable;
  import org.junit.Assert;
  import org.junit.Test;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Test case for WritableUtils.
   */
  public class TestWritableUtils {
  
    /**
     * Tests readList and writeList functions in writable utils.
     * @throws IOException
     */
    @Test
    public void testListSerialization() throws IOException {
      List<Writable> list = new ArrayList<>();
      list.add(new LongWritable(1));
      list.add(new LongWritable(2));
      list.add(null);
      list.add(new FloatWritable(3));
      list.add(new FloatWritable(4));
      list.add(new LongWritable(5));
      list.add(new LongWritable(6));
  
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      DataOutputStream dos = new DataOutputStream(bos);
      WritableUtils.writeList(list, dos);
      dos.close();
  
      byte[] data = bos.toByteArray();
  
      DataInputStream input =
          new DataInputStream(new ByteArrayInputStream(data));
  
      List<Writable> result = (List<Writable>) WritableUtils.readList(input);
  
      Assert.assertEquals(list, result);
  
    }
  
    @Test
    public void testIntArray() throws IOException {
      int[] array = new int[] {1, 2, 3, 4, 5};
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      DataOutputStream dos = new DataOutputStream(bos);
      WritableUtils.writeIntArray(array, dos);
      dos.close();
  
      byte[] data = bos.toByteArray();
  
      DataInputStream input =
          new DataInputStream(new ByteArrayInputStream(data));
  
      int[] result = WritableUtils.readIntArray(input);
  
      Assert.assertArrayEquals(array, result);
    }
  
    @Test
    public void testLongArray() throws IOException {
      long[] array = new long[] {1, 2, 3, 4, 5};
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      DataOutputStream dos = new DataOutputStream(bos);
      WritableUtils.writeLongArray(dos, array);
      dos.close();
  
      byte[] data = bos.toByteArray();
  
      DataInputStream input =
          new DataInputStream(new ByteArrayInputStream(data));
 
     long[] result = WritableUtils.readLongArray(input);
 
     Assert.assertArrayEquals(array, result);
   }
 
 
 
 }