TimeInfoMsg.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.maxcul.internal.messages;

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Message class to handle time information
 *
 * @author Paul Hampson (cyclingengineer)
 * @since 1.6.0
 */
public class TimeInfoMsg extends BaseMsg {

    final static private int TIME_INFO_PAYLOAD_LEN = 5; /* in bytes */
    final static private int TIME_INFO_REQUEST_PAYLOAD_LEN = 0;

    private static final Logger logger = LoggerFactory.getLogger(TimeInfoMsg.class);

    private Calendar messageTimeInfo;
    private TimeZone tz = TimeZone.getTimeZone("Europe/London");

    public TimeInfoMsg(String rawMsg) {
        super(rawMsg);

        if (this.payload.length == TIME_INFO_PAYLOAD_LEN) {
            logger.debug("Year  => " + (this.payload[0] + 2000));
            logger.debug("Month => " + (((this.payload[3] & 0xC0) >> 4) | ((this.payload[4] & 0xC0) >> 6)));
            logger.debug("DoM   => " + this.payload[1]);
            logger.debug("Hour  => " + (this.payload[2] & 0x3F));
            logger.debug("Min   => " + (this.payload[3] & 0x3F));
            logger.debug("Sec   => " + (this.payload[4] & 0x3F));

            messageTimeInfo = new GregorianCalendar(this.payload[0] + 2000, // year
                    (((this.payload[3] & 0xC0) >> 4) | ((this.payload[4] & 0xC0) >> 6)) - 1, // month
                    this.payload[1], // day of month
                    (this.payload[2] & 0x3F), // hour of day
                    (this.payload[3] & 0x3F), // minute
                    (this.payload[4] & 0x3F)); // seconds
        } else if (this.payload.length == TIME_INFO_REQUEST_PAYLOAD_LEN) {
            /*
             * set time to the beginning of history - this will trigger time
             * update
             */
            messageTimeInfo = new GregorianCalendar(0, 0, 1);
            logger.debug("Received Time request - setting time to 1/1/0");
        } else {
            logger.error("TimeInfoMsg raw packet was of incorrect length to parse! Expect " + TIME_INFO_PAYLOAD_LEN
                    + " got " + payload.length);
        }
    }

    public TimeInfoMsg(byte msgCount, byte msgFlag, byte groupId, String srcAddr, String dstAddr, String TimeZoneStr) {
        super(msgCount, msgFlag, MaxCulMsgType.TIME_INFO, groupId, srcAddr, dstAddr);

        tz = TimeZone.getTimeZone(TimeZoneStr);
        updateTime();
    }

    public void updateTime() {
        byte[] payload = new byte[TIME_INFO_PAYLOAD_LEN];
        byte tmp;
        Calendar now = new GregorianCalendar(tz);

        payload[0] = (byte) (now.get(Calendar.YEAR) - 2000);
        payload[1] = (byte) now.get(Calendar.DAY_OF_MONTH);
        payload[2] = (byte) now.get(Calendar.HOUR_OF_DAY); // TODO ?? can set
                                                           // DST flag in
                                                           // bit[6] to advance
                                                           // time by 1hour,
                                                           // but java handles
                                                           // this
        /* build byte 3. [0:5] contain minute, [6:7] contain bits [2:3] of month */
        tmp = (byte) (now.get(Calendar.MONTH) + 1);
        tmp &= 0x0c;
        tmp <<= 4;
        tmp |= (byte) (now.get(Calendar.MINUTE) & 0x3f);
        payload[3] = tmp;

        /*
         * build byte 3. [0:5] contain seconds, [6:7] contain bits [0:1] of
         * month
         */
        tmp = (byte) (now.get(Calendar.MONTH) + 1);
        tmp &= 0x03;
        tmp <<= 6;
        tmp |= (byte) (now.get(Calendar.SECOND) & 0x3f);
        payload[4] = tmp;

        super.appendPayload(payload);
        super.printDebugPayload();
    }

    @Override
    protected void printFormattedPayload() {
        super.printDebugPayload();
        logger.debug("\tDecoded Time: " + this.messageTimeInfo.get(Calendar.YEAR) + "-"
                + this.messageTimeInfo.get(Calendar.MONTH + 1) + "-" + this.messageTimeInfo.get(Calendar.DAY_OF_MONTH)
                + " " + this.messageTimeInfo.get(Calendar.HOUR_OF_DAY) + ":" + this.messageTimeInfo.get(Calendar.MINUTE)
                + ":" + this.messageTimeInfo.get(Calendar.SECOND));
    }

    public Calendar getTimeInfo() {
        return messageTimeInfo;
    }
}