sdrtrunk/src/module/decode/p25/message/ldu/lc/ChannelIdentifierUpdate.java

/*******************************************************************************
 * sdrtrunk
 * Copyright (C) 2014-2017 Dennis Sheirer
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 ******************************************************************************/
package module.decode.p25.message.ldu.lc;

import module.decode.p25.message.IBandIdentifier;
import module.decode.p25.message.ldu.LDU1Message;
import module.decode.p25.reference.LinkControlOpcode;

public class ChannelIdentifierUpdate extends LDU1Message implements IBandIdentifier
{
    public static final int[] IDENTIFIER = {364, 365, 366, 367};
    public static final int[] BANDWIDTH = {372, 373, 374, 375, 376, 377, 382, 383, 384};
    public static final int[] TRANSMIT_OFFSET = {385, 386, 387, 536, 537, 538, 539,
        540, 541};
    public static final int[] CHANNEL_SPACING = {546, 547, 548, 549, 550, 551, 556,
        557, 558, 559};
    public static final int[] BASE_FREQUENCY = {560, 561, 566, 567, 568, 569, 570,
        571, 720, 721, 722, 723, 724, 725, 730, 731, 732, 733, 734, 735, 740, 741, 742, 743, 744,
        745, 750, 751, 752, 753, 754, 755};

    public ChannelIdentifierUpdate(LDU1Message message)
    {
        super(message);
    }

    @Override
    public String getEventType()
    {
        return LinkControlOpcode.CHANNEL_IDENTIFIER_UPDATE.getDescription();
    }

    @Override
    public String getMessage()
    {
        StringBuilder sb = new StringBuilder();

        sb.append(getMessageStub());

        sb.append(" IDEN:" + getIdentifier());

        sb.append(" BASE:" + getBaseFrequency());

        sb.append(" BW:" + getBandwidth());

        sb.append(" SPACING:" + getChannelSpacing());

        sb.append(" OFFSET:" + getTransmitOffset());

        return sb.toString();
    }

    @Override
    public int getIdentifier()
    {
        return mMessage.getInt(IDENTIFIER);
    }

    /**
     * Channel bandwidth in hertz
     */
    @Override
    public int getBandwidth()
    {
        return mMessage.getInt(BANDWIDTH) * 125;
    }

    @Override
    public long getChannelSpacing()
    {
        return mMessage.getLong(CHANNEL_SPACING) * 125l;
    }

    @Override
    public long getBaseFrequency()
    {
        return mMessage.getLong(BASE_FREQUENCY) * 5l;
    }

    @Override
    public long getTransmitOffset()
    {
        return -1 * mMessage.getLong(TRANSMIT_OFFSET) * 250000l;
    }

    @Override
    public long getDownlinkFrequency(int channelNumber)
    {
        return getBaseFrequency() + (channelNumber * getChannelSpacing());
    }

    @Override
    public long getUplinkFrequency(int channelNumber)
    {
        return getDownlinkFrequency(channelNumber) + getTransmitOffset();
    }

    @Override
    public boolean isTDMA()
    {
        return false;
    }
}