01 package gate.creole.annic.apache.lucene.store;
02
03 /**
04 * Copyright 2004 The Apache Software Foundation
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
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
19 /**
20 * A memory-resident {@link InputStream} implementation.
21 *
22 * @version $Id: RAMInputStream.java 529 2004-10-05 11:55:26Z niraj $
23 */
24
25 class RAMInputStream extends InputStream implements Cloneable {
26 private RAMFile file;
27 private int pointer = 0;
28
29 public RAMInputStream(RAMFile f) {
30 file = f;
31 length = file.length;
32 }
33
34 public void readInternal(byte[] dest, int destOffset, int len) {
35 int remainder = len;
36 int start = pointer;
37 while (remainder != 0) {
38 int bufferNumber = start/BUFFER_SIZE;
39 int bufferOffset = start%BUFFER_SIZE;
40 int bytesInBuffer = BUFFER_SIZE - bufferOffset;
41 int bytesToCopy = bytesInBuffer >= remainder ? remainder : bytesInBuffer;
42 byte[] buffer = (byte[])file.buffers.elementAt(bufferNumber);
43 System.arraycopy(buffer, bufferOffset, dest, destOffset, bytesToCopy);
44 destOffset += bytesToCopy;
45 start += bytesToCopy;
46 remainder -= bytesToCopy;
47 }
48 pointer += len;
49 }
50
51 public void close() {
52 }
53
54 public void seekInternal(long pos) {
55 pointer = (int)pos;
56 }
57 }
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