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   * 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 com.aliyun.odps.mapred.bridge;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.LinkedList;
  import java.util.Queue;
  
  import org.junit.Test;
  
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.io.LongWritable;
  import com.aliyun.odps.io.Text;
  import com.aliyun.odps.mapred.bridge.type.ColumnBasedRecordComparator;
  import com.aliyun.odps.mapred.utils.SchemaUtils;
  
  public class GroupingRecordIteratorTest {
  
    @Test
    public void testGrouping() {
      Queue<Object[]> queue = new LinkedList<Object[]>();
      queue.add(new Object[]{new Text("foo"), new LongWritable(1L)});
      queue.add(new Object[]{new Text("foo"), new LongWritable(2L)});
      queue.add(new Object[]{new Text("bar"), new LongWritable(3L)});
      queue.add(new Object[]{new Text("bar"), new LongWritable(4L)});
      Record key = new WritableRecord(SchemaUtils.fromString("k:string"));
      Record value = new WritableRecord(SchemaUtils.fromString("v:bigint"));
      Comparator<Object[]> comparator = new ColumnBasedRecordComparator(new int[]{0},
                                                                        key.getColumns());
      GroupingRecordIterator itr = new GroupingRecordIterator(queue, (WritableRecord) key,
                                                              (WritableRecord) value, comparator);
      key.set(Arrays.copyOf(queue.peek(), 1));
      Long v = 1L;
      while (itr.hasNext()) {
        Long val = (Long) itr.next().get(0);
        assertEquals(v, val);
        v++;
      }
      itr.reset();
      while (itr.hasNext()) {
        Long val = (Long) itr.next().get(0);
        assertEquals(v, val);
        v++;
      }
    }
  
    @Test
    public void testHasNext() {
      Queue<Object[]> queue = new LinkedList<Object[]>();
      queue.add(new Object[]{new Text("foo"), new LongWritable(1L)});
      queue.add(new Object[]{new Text("foo"), new LongWritable(2L)});
      queue.add(new Object[]{new Text("bar"), new LongWritable(3L)});
      queue.add(new Object[]{new Text("bar"), new LongWritable(4L)});
      Record key = new WritableRecord(SchemaUtils.fromString("k:string"));
      Record value = new WritableRecord(SchemaUtils.fromString("v:bigint"));
      Comparator<Object[]> comparator = new ColumnBasedRecordComparator(new int[]{0},
                                                                        key.getColumns());
      GroupingRecordIterator itr = new GroupingRecordIterator(queue, (WritableRecord) key,
                                                              (WritableRecord) value, comparator);
      key.set(Arrays.copyOf(queue.peek(), 1));
      Long v = 1L;
      while (itr.hasNext()) {
        itr.hasNext();
        Long val = (Long) itr.next().get(0);
        assertEquals(v, val);
        v++;
      }
      itr.reset();
      while (itr.hasNext()) {
        itr.hasNext();
        Long val = (Long) itr.next().get(0);
        assertEquals(v, val);
        v++;
      }
      assertEquals(5, v.longValue());
    }
  
    @Test
    public void testSameGroup() {
      Queue<Object[]> queue = new LinkedList<Object[]>();
      queue.add(new Object[]{new Text("foo"), new LongWritable(1L)});
      queue.add(new Object[]{new Text("foo"), new LongWritable(2L)});
      queue.add(new Object[]{new Text("foo"), new LongWritable(3L)});
      queue.add(new Object[]{new Text("foo"), new LongWritable(4L)});
      Record key = new WritableRecord(SchemaUtils.fromString("k:string"));
      Record value = new WritableRecord(SchemaUtils.fromString("v:bigint"));
      Comparator<Object[]> comparator = new ColumnBasedRecordComparator(new int[]{0},
                                                                        key.getColumns());
      GroupingRecordIterator itr = new GroupingRecordIterator(queue, (WritableRecord) key,
                                                              (WritableRecord) value, comparator);
      key.set(Arrays.copyOf(queue.peek(), 1));
      Long v = 1L;
      while (itr.hasNext()) {
        itr.hasNext();
        Long val = (Long) itr.next().get(0);
        assertEquals(v, val);
        v++;
      }
      assertEquals(5, v.longValue());
      itr.reset();
      assertFalse(itr.hasNext());
    }
  }
  