/protocols/smpp/src/main/java/org/mobicents/protocols/smpp/gsm/ConcatenatedSms.java

 1/*
 2 * JBoss, Home of Professional Open Source
 3 * Copyright 2011, Red Hat, Inc. and individual contributors
 4 * by the @authors tag. See the copyright.txt in the distribution for a
 5 * full listing of individual contributors.
 6 *
 7 * This is free software; you can redistribute it and/or modify it
 8 * under the terms of the GNU Lesser General Public License as
 9 * 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
23package org.mobicents.protocols.smpp.gsm;
24
25import java.nio.ByteBuffer;
26import java.security.SecureRandom;
27import java.util.HashMap;
28import java.util.List;
29import java.util.Map;
30import java.util.Random;
31
32public class ConcatenatedSms extends RecurringHeaderElement {
33
34    private static final Random RANDOM = new SecureRandom();
35    
36    private int referenceNumber = 1;
37    private boolean use16bitRef;
38    /**
39     * Store the location in each buffer where we need to go back
40     * end update the correct number of segments being sent.
41     */
42    private Map<ByteBuffer, Integer> totalMsgs =
43        new HashMap<ByteBuffer, Integer>();
44
45    public ConcatenatedSms(boolean use16bitRef) {
46        super(true);
47        this.use16bitRef = use16bitRef;
48        reset();
49    }
50
51    public boolean doWrite(int segmentNum, ByteBuffer buffer) {
52        if (use16bitRef) {
53            buffer.put((byte) 8);
54            buffer.put((byte) 4);
55            buffer.putShort((short) referenceNumber);
56        } else {
57            buffer.put((byte) 0);
58            buffer.put((byte) 3);
59            buffer.put((byte) referenceNumber);
60        }
61        totalMsgs.put(buffer, buffer.position());
62        buffer.put((byte) 1);
63        buffer.put((byte) segmentNum);
64        return true;
65    }
66
67    public int getLength() {
68        if (use16bitRef) {
69            return 4;
70        } else {
71            return 3;
72        }
73    }
74
75    @Override
76    public void reset() {
77        super.reset();
78        int max = use16bitRef ? 65535 : 255;
79        referenceNumber = RANDOM.nextInt(max);
80    }
81    
82    @Override
83    public void postProcess(List<ByteBuffer> segments) {
84        int numSegments = segments.size();
85        if (numSegments != totalMsgs.size()) {
86            throw new IllegalStateException("Cannot update all segments");
87        }
88        for (Map.Entry<ByteBuffer, Integer> entry : totalMsgs.entrySet()) {
89            entry.getKey().put(entry.getValue(), (byte) numSegments);
90        }
91    }
92}