TemperatureMeasurementParser.java

/*
 * Copyright (c) 2015, Nordic Semiconductor
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 */
package no.nordicsemi.android.nrftoolbox.parser;

import android.bluetooth.BluetoothGattCharacteristic;

import java.util.Locale;

public class TemperatureMeasurementParser {
	private static final byte TEMPERATURE_UNIT_FLAG = 0x01; // 1 bit
	private static final byte TIMESTAMP_FLAG = 0x02; // 1 bits
	private static final byte TEMPERATURE_TYPE_FLAG = 0x04; // 1 bit

	public static String parse(final BluetoothGattCharacteristic characteristic) {
		int offset = 0;
		final int flags = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, offset++);

		/*
		 * false 	Temperature is in Celsius degrees 
		 * true 	Temperature is in Fahrenheit degrees 
		 */
		final boolean fahrenheit = (flags & TEMPERATURE_UNIT_FLAG) > 0;

		/*
		 * false 	No Timestamp in the packet
		 * true 	There is a timestamp information
		 */
		final boolean timestampIncluded = (flags & TIMESTAMP_FLAG) > 0;

		/*
		 * false 	Temperature type is not included
		 * true 	Temperature type included in the packet
		 */
		final boolean temperatureTypeIncluded = (flags & TEMPERATURE_TYPE_FLAG) > 0;

		final float tempValue = characteristic.getFloatValue(BluetoothGattCharacteristic.FORMAT_FLOAT, offset);
		offset += 4;

		String dateTime = null;
		if (timestampIncluded) {
			dateTime = DateTimeParser.parse(characteristic, offset);
			offset += 7;
		}

		String type = null;
		if (temperatureTypeIncluded) {
			type = TemperatureTypeParser.parse(characteristic, offset);
			// offset++;
		}

		final StringBuilder builder = new StringBuilder();
		builder.append(String.format(Locale.US, "%.02f", tempValue));

		if (fahrenheit)
			builder.append("°F");
		else
			builder.append("°C");

		if (timestampIncluded)
			builder.append("\nTime: ").append(dateTime);
		if (temperatureTypeIncluded)
			builder.append("\nType: ").append(type);
		return builder.toString();
	}
}