1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.codec;
19
20 import java.io.InputStream;
21 import java.io.OutputStream;
22
23 import org.apache.hadoop.hbase.CellScanner;
24 import org.apache.hadoop.hbase.io.CellOutputStream;
25 import org.apache.hadoop.hbase.io.encoding.DataBlockEncoder;
26
27 /**
28 * Encoder/Decoder for Cell.
29 *
30 * <p>Like {@link DataBlockEncoder} only Cell-based rather than KeyValue version 1 based
31 * and without presuming an hfile context. Intent is an Interface that will work for hfile and
32 * rpc.
33 */
34 public interface Codec {
35 // TODO: interfacing with {@link DataBlockEncoder}
36 /**
37 * Call flush when done. Some encoders may not put anything on the stream until flush is called.
38 * On flush, let go of any resources used by the encoder.
39 */
40 interface Encoder extends CellOutputStream {}
41
42 /**
43 * Implementations should implicitly clean up any resources allocated when the
44 * Decoder/CellScanner runs off the end of the cell block. Do this rather than require the user
45 * call close explicitly.
46 */
47 interface Decoder extends CellScanner {};
48
49 Decoder getDecoder(InputStream is);
50 Encoder getEncoder(OutputStream os);
51 }