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   1 /**
   2  * Copyright (c) 2010-2021 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.lifx.internal.util;
  14
  15 import java.math.BigDecimal;
  16 import java.math.RoundingMode;
  17 import java.util.UUID;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.openhab.binding.lifx.internal.fields.HSBK;
  21 import org.openhab.binding.lifx.internal.protocol.Product.TemperatureRange;
  22 import org.openhab.core.library.types.DecimalType;
  23 import org.openhab.core.library.types.IncreaseDecreaseType;
  24 import org.openhab.core.library.types.PercentType;
  25
  26 /**
  27  * Utility class for sharing message utility methods between objects.
  28  *
  29  * @author Wouter Born - Extracted methods from LifxLightHandler
  30  */
  31 @NonNullByDefault
  32 public final class LifxMessageUtil {
  33
  34     private static final BigDecimal INCREASE_DECREASE_STEP = new BigDecimal(10);
  35
  36     private static final BigDecimal ZERO = PercentType.ZERO.toBigDecimal();
  37     private static final BigDecimal HUNDRED = PercentType.HUNDRED.toBigDecimal();
  38
  39     private LifxMessageUtil() {
  40         // hidden utility class constructor
  41     }
  42
  43     public static PercentType increaseDecreasePercentType(IncreaseDecreaseType increaseDecreaseType, PercentType old) {
  44         BigDecimal delta = ZERO;
  45         if (increaseDecreaseType == IncreaseDecreaseType.INCREASE) {
  46             delta = INCREASE_DECREASE_STEP;
  47         } else if (increaseDecreaseType == IncreaseDecreaseType.DECREASE) {
  48             delta = INCREASE_DECREASE_STEP.negate();
  49         }
  50
  51         if (!ZERO.equals(delta)) {
  52             BigDecimal newValue = old.toBigDecimal().add(delta);
  53             newValue = newValue.setScale(0, RoundingMode.HALF_UP);
  54             newValue = newValue.min(HUNDRED);
  55             newValue = newValue.max(ZERO);
  56             return new PercentType(newValue);
  57         } else {
  58             return old;
  59         }
  60     }
  61
  62     private static PercentType intToPercentType(int i) {
  63         return new PercentType(Math.round((i / 65535.0f) * 100));
  64     }
  65
  66     private static int percentTypeToInt(PercentType percentType) {
  67         return (int) (percentType.floatValue() / 100 * 65535.0f);
  68     }
  69
  70     public static DecimalType hueToDecimalType(int hue) {
  71         return new DecimalType(hue * 360 / 65535.0f);
  72     }
  73
  74     public static int decimalTypeToHue(DecimalType hue) {
  75         return (int) (hue.floatValue() / 360 * 65535.0f);
  76     }
  77
  78     public static PercentType saturationToPercentType(int saturation) {
  79         return intToPercentType(saturation);
  80     }
  81
  82     public static int percentTypeToSaturation(PercentType saturation) {
  83         return percentTypeToInt(saturation);
  84     }
  85
  86     public static PercentType brightnessToPercentType(int brightness) {
  87         return intToPercentType(brightness);
  88     }
  89
  90     public static int percentTypeToBrightness(PercentType brightness) {
  91         return percentTypeToInt(brightness);
  92     }
  93
  94     public static PercentType kelvinToPercentType(int kelvin, TemperatureRange temperatureRange) {
  95         if (temperatureRange.getRange() == 0) {
  96             return PercentType.HUNDRED;
  97         }
  98         BigDecimal value = BigDecimal
  99                 .valueOf((kelvin - temperatureRange.getMaximum()) / (temperatureRange.getRange() / -100));
 100         value = value.min(HUNDRED);
 101         value = value.max(ZERO);
 102         return new PercentType(value);
 103     }
 104
 105     public static int percentTypeToKelvin(PercentType temperature, TemperatureRange temperatureRange) {
 106         return Math.round(
 107                 temperatureRange.getMaximum() - (temperature.floatValue() * (temperatureRange.getRange() / 100)));
 108     }
 109
 110     public static PercentType infraredToPercentType(int infrared) {
 111         return intToPercentType(infrared);
 112     }
 113
 114     public static int percentTypeToInfrared(PercentType infrared) {
 115         return percentTypeToInt(infrared);
 116     }
 117
 118     public static boolean sameColors(HSBK... colors) {
 119         if (colors.length <= 1) {
 120             return true;
 121         }
 122
 123         for (int i = 1; i < colors.length; i++) {
 124             if (!colors[0].equals(colors[i])) {
 125                 return false;
 126             }
 127         }
 128         return true;
 129     }
 130
 131     public static long randomSourceId() {
 132         return UUID.randomUUID().getLeastSignificantBits() & (-1L >>> 32);
 133     }
 134 }