01: /*
02:
03: Derby - Class org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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;
25: import java.io.IOException;
26:
27: public abstract class BufferedByteHolderInputStream extends
28: ByteHolderInputStream {
29: public BufferedByteHolderInputStream(ByteHolder bh) {
30: super (bh);
31: }
32:
33: public abstract void fillByteHolder() throws IOException;
34:
35: public int read() throws IOException {
36: fillByteHolder();
37: return super .read();
38: }
39:
40: public int read(byte b[], int off, int len) throws IOException {
41: fillByteHolder();
42: return super .read(b, off, len);
43: }
44:
45: public long skip(long count) throws IOException {
46: int bytesSkipped = 0;
47: while (bytesSkipped < count) {
48: fillByteHolder();
49: bytesSkipped += super .skip(count - bytesSkipped);
50: }
51: return bytesSkipped;
52: }
53:
54: public int available() throws IOException {
55: fillByteHolder();
56: return super.available();
57: }
58: }
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