ParseUtils.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.s300th.internal;

/**
 * Small utility class to help parsing the binary messages
 *
 * @author Till Klocke
 * @since 1.4.0
 *
 */
public class ParseUtils {

    public static double parseTemperature(String data) {

        double temp = valueFromChars(data.charAt(6), data.charAt(3), data.charAt(4));
        int firstbyte = Integer.parseInt(String.valueOf(data.charAt(1)), 16);
        if ((firstbyte & 8) == 0) {
            return temp;
        } else {
            return -temp;
        }
    }

    private static double valueFromChars(char... chars) {
        StringBuffer buffer = new StringBuffer(chars.length + 1);
        for (int i = 0; i < chars.length; i++) {
            if (i == chars.length - 1) {
                buffer.append('.');
            }
            buffer.append(chars[i]);
        }
        return Double.parseDouble(buffer.toString());
    }

    public static double parseKS300Wind(String data) {
        return valueFromChars(data.charAt(9), data.charAt(10), data.charAt(7));
    }

    /**
     * each count value is a rain amount of 295ml
     * http://www.elv.de/controller.aspx?cid=824&detail=10&detail2=3232
     * 
     * @param data
     * @return
     */
    public static int parseKS300RainCounter(String data) {

        StringBuffer buffer = new StringBuffer(3);
        buffer.append(data.charAt(14));
        buffer.append(data.charAt(11));
        buffer.append(data.charAt(12));

        return Integer.parseInt(buffer.toString(), 16);
    }

    public static boolean isKS300Raining(String data) {
        int firstbyte = Integer.parseInt(data.substring(1, 2), 16);
        return ((firstbyte & 2) > 0);
    }

    public static double parseKS300Humidity(String data) {
        return valueFromChars(data.charAt(8), data.charAt(5), '0');
    }

    public static double parseS300THHumidity(String data) {
        return valueFromChars(data.charAt(7), data.charAt(8), data.charAt(5));
    }

    public static String parseS300THAddress(String data) {
        int firstbyte = Integer.parseInt(String.valueOf(data.charAt(1)), 16);
        int addressValue = (firstbyte & 7) + 1;
        String address = Integer.toHexString(addressValue);
        return address;
    }

}