ParsingUtils.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.em.internal;

import org.openhab.binding.em.internal.EMBindingConfig.EMType;

/**
 * Simple util class to parse data from the received Strings
 *
 * @author Till Klocke
 * @since 1.4.0
 *
 */
public class ParsingUtils {

    /**
     * Get the address in the received data.
     * 
     * @param data
     *            the received String
     * @return the device address as String
     */
    public static String parseAddress(String data) {
        return data.substring(3, 5);
    }

    /**
     * Get the counter information from the received data
     * 
     * @param data
     * @return integer representation of the packet count
     */
    public static int parseCounter(String data) {
        return Integer.parseInt(data.substring(5, 7), 16);
    }

    /**
     * Get the cumulated value
     * 
     * @param data
     * @return the cumulated value as integers
     */
    public static int parseCumulatedValue(String data) {
        return getIntFromChars(data.charAt(9), data.charAt(10), data.charAt(7), data.charAt(8));
    }

    /**
     * Get the current value
     * 
     * @param data
     * @return the current value as integer
     */
    public static int parseCurrentValue(String data) {
        return getIntFromChars(data.charAt(13), data.charAt(14), data.charAt(11), data.charAt(12));
    }

    /**
     * Get the peak value
     * 
     * @param data
     * @return the peak value as int
     */
    public static int parsePeakValue(String data) {
        return getIntFromChars(data.charAt(17), data.charAt(18), data.charAt(15), data.charAt(16));
    }

    private static int getIntFromChars(char... chars) {
        StringBuffer buffer = new StringBuffer(chars.length);
        for (int i = 0; i < chars.length; i++) {
            buffer.append(chars[i]);
        }
        return Integer.parseInt(buffer.toString(), 16);
    }

    /**
     * Get the type of the EM device
     * 
     * @param data
     * @return an enum of type EMType representing the device type
     */
    public static EMType parseType(String data) {
        String typeString = data.substring(1, 3);
        return EMType.getFromTypeValue(typeString);
    }

}