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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.automation.pwm.internal.handler.state;
  14
  15 import java.util.concurrent.ScheduledExecutorService;
  16 import java.util.function.Consumer;
  17
  18 import org.eclipse.jdt.annotation.NonNullByDefault;
  19
  20 /**
  21  * The context of all states.
  22  *
  23  * @author Fabian Wolter - Initial Contribution
  24  */
  25 @NonNullByDefault
  26 public class StateMachine {
  27     private ScheduledExecutorService scheduler;
  28     private Consumer<Boolean> controlOutput;
  29     private State state;
  30     private long periodMs;
  31     private double dutycycle;
  32
  33     public StateMachine(ScheduledExecutorService scheduler, Consumer<Boolean> controlOutput, long periodMs) {
  34         this.scheduler = scheduler;
  35         this.controlOutput = controlOutput;
  36         this.periodMs = periodMs;
  37         this.state = new AlwaysOffState(this);
  38     }
  39
  40     public ScheduledExecutorService getScheduler() {
  41         return scheduler;
  42     }
  43
  44     public void setDutycycle(double newDutycycle) {
  45         if (dutycycle != newDutycycle) {
  46             this.dutycycle = newDutycycle;
  47             state.dutyCycleChanged();
  48         }
  49
  50         state.dutyCycleUpdated();
  51     }
  52
  53     public double getDutycycle() {
  54         return dutycycle;
  55     }
  56
  57     public long getPeriodMs() {
  58         return periodMs;
  59     }
  60
  61     public State getState() {
  62         return state;
  63     }
  64
  65     public void setState(State current) {
  66         this.state = current;
  67     }
  68
  69     public void controlOutput(boolean on) {
  70         controlOutput.accept(on);
  71     }
  72
  73     public void reset() {
  74         state.nextState(OnState::new);
  75     }
  76
  77     public void stop() {
  78         state.nextState(AlwaysOffState::new);
  79     }
  80 }