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1   /*
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.filter;
22  
23  /**
24   * A binary comparator which lexicographically compares against the specified
25   * byte array using {@link org.apache.hadoop.hbase.util.Bytes#compareTo(byte[], byte[])}.
26   */
27  public class NullComparator extends WritableByteArrayComparable {
28  
29    /** Nullary constructor for Writable, do not use */
30    public NullComparator() {
31      value = new byte[0];
32    }
33  
34    @Override
35    public int compareTo(byte[] value) {
36      return value != null ? 1 : 0;
37    }
38  
39    @Override
40    public int compareTo(byte[] value, int offset, int length) {
41      return compareTo(value);
42    }
43  }