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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.IOException;
21  import java.io.OutputStream;
22  
23  import org.apache.hadoop.hbase.KeyValue;
24  
25  public abstract class BaseEncoder implements Encoder {
26    protected final OutputStream out;
27    // This encoder is 'done' once flush has been called.
28    protected boolean flushed = false;
29  
30    public BaseEncoder(final OutputStream out) {
31      this.out = out;
32    }
33  
34    @Override
35    public abstract void write(KeyValue cell) throws IOException;
36  
37    protected void checkFlushed() throws CodecException {
38      if (this.flushed) throw new CodecException("Flushed; done");
39    }
40  
41    @Override
42    public void flush() throws IOException {
43      if (this.flushed) return;
44      this.flushed = true;
45      this.out.flush();
46    }
47  }