Java tutorial
/* * TeleStax, Open Source Cloud Communications Copyright 2012. * and individual contributors * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.mobicents.protocols.ss7.m3ua.impl.message; import io.netty.buffer.ByteBuf; import java.nio.ByteBuffer; import javolution.text.TextBuilder; import javolution.util.FastMap; import org.mobicents.protocols.ss7.m3ua.impl.parameter.ParameterFactoryImpl; import org.mobicents.protocols.ss7.m3ua.message.M3UAMessage; import org.mobicents.protocols.ss7.m3ua.parameter.Parameter; /** * @author amit bhayani * @author kulikov * @author sergey vetyutnev */ public abstract class M3UAMessageImpl implements M3UAMessage { // header part private int messageClass; private int messageType; private String message; protected FastMap<Short, Parameter> parameters = new FastMap<Short, Parameter>(); private ParameterFactoryImpl factory = new ParameterFactoryImpl(); int initialPosition = 0; public M3UAMessageImpl(String message) { this.message = message; } protected M3UAMessageImpl(int messageClass, int messageType, String message) { this(message); this.messageClass = messageClass; this.messageType = messageType; } protected abstract void encodeParams(ByteBuffer buffer); public void encode(ByteBuf byteBuf) { byteBuf.writeByte(1); byteBuf.writeByte(0); byteBuf.writeByte(messageClass); byteBuf.writeByte(messageType); ByteBuffer buffer = ByteBuffer.allocate(4096); encodeParams(buffer); int length = buffer.position(); byte[] data = new byte[length]; buffer.flip(); buffer.get(data); byteBuf.writeInt(length + 8); byteBuf.writeBytes(data); } protected void decode(ByteBuf data) { while (data.readableBytes() >= 4) { short tag = (short) ((data.readUnsignedByte() << 8) | (data.readUnsignedByte())); short len = (short) ((data.readUnsignedByte() << 8) | (data.readUnsignedByte())); if (data.readableBytes() < len - 4) { return; } byte[] value = new byte[len - 4]; data.readBytes(value); parameters.put(tag, factory.createParameter(tag, value)); // The Parameter Length does not include any padding octets. We have // to consider padding here int padding = 4 - (len % 4); if (padding < 4) { if (data.readableBytes() < padding) return; else data.skipBytes(padding); } } } public int getMessageClass() { return messageClass; } public int getMessageType() { return messageType; } @Override public String toString() { TextBuilder tb = new TextBuilder(); tb.append(this.message).append(" Params("); for (FastMap.Entry<Short, Parameter> e = parameters.head(), end = parameters .tail(); (e = e.getNext()) != end;) { Parameter value = e.getValue(); tb.append(value.toString()); tb.append(", "); } tb.append(")"); return tb.toString(); } }