be.error.rpi.ebus.Support.java Source code

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Here is the source code for be.error.rpi.ebus.Support.java

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/*-
 * #%L
 * Home Automation
 * %%
 * Copyright (C) 2016 - 2017 Koen Serneels
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package be.error.rpi.ebus;

import static java.lang.String.format;
import static java.math.BigDecimal.ROUND_FLOOR;
import static java.math.RoundingMode.HALF_UP;
import static org.apache.commons.codec.binary.Hex.encodeHex;
import static org.apache.commons.lang3.StringUtils.substring;

import java.math.BigDecimal;

public class Support {

    public static String addTemperatureToCommand(String command, BigDecimal temperature, int offset) {
        String converted = encodeDATA2c(temperature.add(new BigDecimal(offset)));
        return format(command, substring(converted, 2, 4), substring(converted, 0, 2));
    }

    public static BigDecimal decodeDATA2c(byte[] data) {
        return new BigDecimal(decodeInt(data)).divide(new BigDecimal(16)).setScale(2, HALF_UP);
    }

    private static short decodeInt(byte[] data) {
        return (short) (data[0] << 8 | data[1] & 0xFF);
    }

    public static String encodeDATA2c(BigDecimal data) {
        return new String(encodeHex(
                encodeInt((short) (data.multiply(new BigDecimal(16)).setScale(0, ROUND_FLOOR).floatValue()))));
    }

    private static byte[] encodeInt(short data) {
        return new byte[] { (byte) (data >> 8), (byte) data };
    }
}