hbase-server/src/test/java/org/apache/hadoop/hbase/filter/TestSingleColumnValueExcludeFilter.java

/**
 * 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.hadoop.hbase.filter;

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

import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellComparatorImpl;
import org.apache.hadoop.hbase.CompareOperator;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.testclassification.FilterTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

/**
 * Tests for {@link SingleColumnValueExcludeFilter}. Because this filter
 * extends {@link SingleColumnValueFilter}, only the added functionality is
 * tested. That is, method filterCell(Cell).
 *
 */
@Category({FilterTests.class, SmallTests.class})
public class TestSingleColumnValueExcludeFilter {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestSingleColumnValueExcludeFilter.class);

  private static final byte[] ROW = Bytes.toBytes("test");
  private static final byte[] COLUMN_FAMILY = Bytes.toBytes("test");
  private static final byte[] COLUMN_QUALIFIER = Bytes.toBytes("foo");
  private static final byte[] COLUMN_QUALIFIER_2 = Bytes.toBytes("foo_2");
  private static final byte[] VAL_1 = Bytes.toBytes("a");
  private static final byte[] VAL_2 = Bytes.toBytes("ab");

  /**
   * Test the overridden functionality of filterCell(Cell)
   * @throws Exception
   */
  @Test
  public void testFilterCell() throws Exception {
    Filter filter = new SingleColumnValueExcludeFilter(COLUMN_FAMILY, COLUMN_QUALIFIER,
    CompareOperator.EQUAL, VAL_1);

    // A 'match' situation
    List<Cell> kvs = new ArrayList<>();
    KeyValue c = new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER_2, VAL_1);

    kvs.add (new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER_2, VAL_1));
    kvs.add (new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER, VAL_1));
    kvs.add (new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER_2, VAL_1));

    filter.filterRowCells(kvs);

    assertEquals("resultSize", 2, kvs.size());
    assertTrue("leftKV1", CellComparatorImpl.COMPARATOR.compare(kvs.get(0), c) == 0);
    assertTrue("leftKV2", CellComparatorImpl.COMPARATOR.compare(kvs.get(1), c) == 0);
    assertFalse("allRemainingWhenMatch", filter.filterAllRemaining());

    // A 'mismatch' situation
    filter.reset();
    // INCLUDE expected because test column has not yet passed
    c = new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER_2, VAL_1);
    assertTrue("otherColumn", filter.filterCell(c) == Filter.ReturnCode.INCLUDE);
    // Test column will pass (wont match), expect NEXT_ROW
    c = new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER, VAL_2);
    assertTrue("testedMismatch", filter.filterCell(c) == Filter.ReturnCode.NEXT_ROW);
    // After a mismatch (at least with LatestVersionOnly), subsequent columns are EXCLUDE
    c = new KeyValue(ROW, COLUMN_FAMILY, COLUMN_QUALIFIER_2, VAL_1);
    assertTrue("otherColumn", filter.filterCell(c) == Filter.ReturnCode.NEXT_ROW);
  }


}