TestCellComparator.java example

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 * 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,
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 * See the License for the specific language governing permissions and
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package org.apache.hadoop.hbase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.nio.ByteBuffer;

import org.apache.hadoop.hbase.KeyValue.Type;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category({MiscTests.class, SmallTests.class})
public class TestCellComparator {

  private CellComparator comparator = CellComparator.COMPARATOR;
  byte[] row1 = Bytes.toBytes("row1");
  byte[] row2 = Bytes.toBytes("row2");
  byte[] row_1_0 = Bytes.toBytes("row10");

  byte[] fam1 = Bytes.toBytes("fam1");
  byte[] fam2 = Bytes.toBytes("fam2");
  byte[] fam_1_2 = Bytes.toBytes("fam12");

  byte[] qual1 = Bytes.toBytes("qual1");
  byte[] qual2 = Bytes.toBytes("qual2");

  byte[] val = Bytes.toBytes("val");

  @Test
  public void testCompareCells() {
    KeyValue kv1 = new KeyValue(row1, fam1, qual1, val);
    KeyValue kv2 = new KeyValue(row2, fam1, qual1, val);
    assertTrue((comparator.compare(kv1, kv2)) < 0);

    kv1 = new KeyValue(row1, fam2, qual1, val);
    kv2 = new KeyValue(row1, fam1, qual1, val);
    assertTrue((CellComparator.compareFamilies(kv1, kv2) > 0));

    kv1 = new KeyValue(row1, fam1, qual1, 1l, val);
    kv2 = new KeyValue(row1, fam1, qual1, 2l, val);
    assertTrue((comparator.compare(kv1, kv2) > 0));

    kv1 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    kv2 = new KeyValue(row1, fam1, qual1, 1l, Type.Maximum);
    assertTrue((comparator.compare(kv1, kv2) > 0));

    kv1 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    kv2 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    assertTrue((CellUtil.equals(kv1, kv2)));
  }

  @Test
  public void testCompareCellWithKey() throws Exception {
    KeyValue kv1 = new KeyValue(row1, fam1, qual1, val);
    KeyValue kv2 = new KeyValue(row2, fam1, qual1, val);
    assertTrue((comparator.compare(kv1, kv2.getKey(), 0, kv2.getKey().length)) < 0);

    kv1 = new KeyValue(row1, fam2, qual1, val);
    kv2 = new KeyValue(row1, fam1, qual1, val);
    assertTrue((comparator.compare(kv1, kv2.getKey(), 0, kv2.getKey().length)) > 0);

    kv1 = new KeyValue(row1, fam1, qual1, 1l, val);
    kv2 = new KeyValue(row1, fam1, qual1, 2l, val);
    assertTrue((comparator.compare(kv1, kv2.getKey(), 0, kv2.getKey().length)) > 0);

    kv1 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    kv2 = new KeyValue(row1, fam1, qual1, 1l, Type.Maximum);
    assertTrue((comparator.compare(kv1, kv2.getKey(), 0, kv2.getKey().length)) > 0);

    kv1 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    kv2 = new KeyValue(row1, fam1, qual1, 1l, Type.Put);
    assertTrue((comparator.compare(kv1, kv2.getKey(), 0, kv2.getKey().length)) == 0);
  }

  @Test
  public void testCompareByteBufferedCell() {
    byte[] r1 = Bytes.toBytes("row1");
    byte[] r2 = Bytes.toBytes("row2");
    byte[] f1 = Bytes.toBytes("cf1");
    byte[] q1 = Bytes.toBytes("qual1");
    byte[] q2 = Bytes.toBytes("qual2");
    byte[] v = Bytes.toBytes("val1");
    KeyValue kv = new KeyValue(r1, f1, q1, v);
    ByteBuffer buffer = ByteBuffer.wrap(kv.getBuffer());
    Cell bbCell1 = new ByteBufferKeyValue(buffer, 0, buffer.remaining());
    kv = new KeyValue(r2, f1, q1, v);
    buffer = ByteBuffer.wrap(kv.getBuffer());
    Cell bbCell2 = new ByteBufferKeyValue(buffer, 0, buffer.remaining());
    assertEquals(0, CellComparator.compareColumns(bbCell1, bbCell2));
    assertEquals(0, CellComparator.compareColumns(bbCell1, kv));
    kv = new KeyValue(r2, f1, q2, v);
    buffer = ByteBuffer.wrap(kv.getBuffer());
    Cell bbCell3 = new ByteBufferKeyValue(buffer, 0, buffer.remaining());
    assertEquals(0, CellComparator.compareFamilies(bbCell2, bbCell3));
    assertTrue(CellComparator.compareQualifiers(bbCell2, bbCell3) < 0);
    assertTrue(CellComparator.compareColumns(bbCell2, bbCell3) < 0);

    assertEquals(0, CellComparator.COMPARATOR.compareRows(bbCell2, bbCell3));
    assertTrue(CellComparator.COMPARATOR.compareRows(bbCell1, bbCell2) < 0);
  }
}