AbstractLightwaveRfJsonMessage.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.lightwaverf.internal.command;

import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.openhab.binding.lightwaverf.internal.exception.LightwaveRfMessageException;
import org.openhab.binding.lightwaverf.internal.message.LightwaveRfJsonMessageId;
import org.openhab.binding.lightwaverf.internal.message.LightwaveRfMessageId;

/**
 * An abstract class to allow easier processing of JSON like messsages
 * received from the Lightwave Wifi Link
 *
 * @author Neil Renaud
 * @since 1.8.0
 *
 */
public abstract class AbstractLightwaveRfJsonMessage implements LightwaveRFCommand {

    private static final Pattern MESSAGE_ID_REG_EXP = Pattern.compile(".*\"trans\":([^,}]*).*");

    private final LightwaveRfMessageId messageId;

    public AbstractLightwaveRfJsonMessage(String message) throws LightwaveRfMessageException {
        messageId = getMessageIdFromString(MESSAGE_ID_REG_EXP, message);
    }

    @Override
    public final LightwaveRfMessageId getMessageId() {
        return messageId;
    }

    private LightwaveRfJsonMessageId getMessageIdFromString(Pattern regExp, String message)
            throws LightwaveRfMessageException {
        return new LightwaveRfJsonMessageId(getIntFromText(regExp, message));

    }

    protected String getStringFromText(Pattern regExp, String message) throws LightwaveRfMessageException {
        try {
            Matcher matcher = regExp.matcher(message);
            matcher.matches();
            return matcher.group(1);
        } catch (IllegalStateException e) {
            throw new LightwaveRfMessageException(
                    "Error parsing message for regExp[" + regExp + "] message[" + message + "]", e);
        }
    }

    protected Date getDateFromText(Pattern regExp, String message) throws LightwaveRfMessageException {
        long timeInSeconds = getLongFromText(regExp, message);
        long timeInMillis = timeInSeconds * 1000;
        return new Date(timeInMillis);
    }

    protected int getIntFromText(Pattern regExp, String message) throws LightwaveRfMessageException {
        return Integer.valueOf(getStringFromText(regExp, message));
    }

    protected double getDoubleFromText(Pattern regExp, String message) throws LightwaveRfMessageException {
        return Double.valueOf(getStringFromText(regExp, message));
    }

    protected long getLongFromText(Pattern regExp, String message) throws LightwaveRfMessageException {
        return Long.valueOf(getStringFromText(regExp, message));
    }

    protected long getLightwaveDateFromJavaDate(Date javaDate) {
        return javaDate.getTime() / 1000;
    }
}