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Java > Open Source Codes > org > apache > derby > impl > store > raw > data > BufferedByteHolderInputStream


1 /*
2
3    Derby - Class org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    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
22 package org.apache.derby.impl.store.raw.data;
23
24 import java.io.InputStream JavaDoc;
25 import java.io.IOException JavaDoc;
26
27 public abstract class BufferedByteHolderInputStream
28 extends ByteHolderInputStream
29 {
30     public BufferedByteHolderInputStream(ByteHolder bh) {
31         super(bh);
32     }
33
34     public abstract void fillByteHolder() throws IOException JavaDoc;
35
36     public int read() throws IOException JavaDoc
37     {
38         fillByteHolder();
39         return super.read();
40     }
41
42     public int read(byte b[], int off, int len)
43          throws IOException JavaDoc
44     {
45         fillByteHolder();
46         return super.read(b,off,len);
47     }
48
49     public long skip(long count) throws IOException JavaDoc
50     {
51         int bytesSkipped = 0;
52         while (bytesSkipped < count) {
53             fillByteHolder();
54             bytesSkipped += super.skip(count - bytesSkipped);
55         }
56         return bytesSkipped;
57     }
58
59     public int available() throws IOException JavaDoc
60     {
61         fillByteHolder();
62         return super.available();
63     }
64 }
65
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