01: /*
02: * JBoss, Home of Professional Open Source
03: * Copyright 2005, JBoss Inc., and individual contributors as indicated
04: * by the @authors tag. See the copyright.txt in the distribution for a
05: * full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jbpm.bytes;
23:
24: import java.util.ArrayList;
25: import java.util.Iterator;
26: import java.util.List;
27:
28: import org.jbpm.JbpmConfiguration;
29:
30: /**
31: * is used by {@link org.jbpm.bytes.ByteArray} to chop a
32: * byte arrays into a list of chunks and glue them back together.
33: */
34: public abstract class ByteBlockChopper {
35:
36: public static List chopItUp(byte[] byteArray) {
37: int blockSize = JbpmConfiguration.Configs
38: .getInt("jbpm.byte.block.size");
39: List bytes = null;
40: if ((byteArray != null) && (byteArray.length > 0)) {
41: bytes = new ArrayList();
42: int index = 0;
43: while ((byteArray.length - index) > blockSize) {
44: byte[] byteBlock = new byte[blockSize];
45: System.arraycopy(byteArray, index, byteBlock, 0,
46: blockSize);
47: bytes.add(byteBlock);
48: index += blockSize;
49: }
50: byte[] byteBlock = new byte[byteArray.length - index];
51: System.arraycopy(byteArray, index, byteBlock, 0,
52: byteArray.length - index);
53: bytes.add(byteBlock);
54: }
55: return bytes;
56: }
57:
58: public static byte[] glueChopsBackTogether(List bytes) {
59: byte[] value = null;
60:
61: if (bytes != null) {
62: Iterator iter = bytes.iterator();
63: while (iter.hasNext()) {
64: byte[] byteBlock = (byte[]) iter.next();
65: if (value == null) {
66: value = byteBlock;
67: } else {
68: byte[] oldValue = value;
69: value = new byte[value.length + byteBlock.length];
70: System.arraycopy(oldValue, 0, value, 0,
71: oldValue.length);
72: System.arraycopy(byteBlock, 0, value,
73: oldValue.length, byteBlock.length);
74: }
75: }
76: }
77:
78: return value;
79: }
80: }
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