001package com.pi4j.io.gpio.impl;
002
003/*
004 * #%L
005 * **********************************************************************
006 * ORGANIZATION  :  Pi4J
007 * PROJECT       :  Pi4J :: Java Library (Core)
008 * FILENAME      :  GpioEventMonitorImpl.java
009 *
010 * This file is part of the Pi4J project. More information about
011 * this project can be found here:  https://www.pi4j.com/
012 * **********************************************************************
013 * %%
014 * Copyright (C) 2012 - 2019 Pi4J
015 * %%
016 * This program is free software: you can redistribute it and/or modify
017 * it under the terms of the GNU Lesser General Public License as
018 * published by the Free Software Foundation, either version 3 of the
019 * License, or (at your option) any later version.
020 *
021 * This program is distributed in the hope that it will be useful,
022 * but WITHOUT ANY WARRANTY; without even the implied warranty of
023 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
024 * GNU General Lesser Public License for more details.
025 *
026 * You should have received a copy of the GNU General Lesser Public
027 * License along with this program.  If not, see
028 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
029 * #L%
030 */
031
032import com.pi4j.io.gpio.GpioPinInput;
033import com.pi4j.io.gpio.PinState;
034import com.pi4j.io.gpio.event.GpioPinListener;
035import com.pi4j.io.gpio.event.GpioPinAnalogValueChangeEvent;
036import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
037import com.pi4j.io.gpio.event.GpioPinListenerAnalog;
038import com.pi4j.io.gpio.event.GpioPinListenerDigital;
039import com.pi4j.io.gpio.event.PinAnalogValueChangeEvent;
040import com.pi4j.io.gpio.event.PinEvent;
041import com.pi4j.io.gpio.event.PinEventType;
042import com.pi4j.io.gpio.event.PinDigitalStateChangeEvent;
043import com.pi4j.io.gpio.event.PinListener;
044import com.pi4j.io.gpio.trigger.GpioTrigger;
045
046import java.util.ArrayList;
047import java.util.Collection;
048
049@SuppressWarnings("unused")
050public class GpioEventMonitorImpl implements PinListener {
051    private final GpioPinInput pin;
052
053    public GpioEventMonitorImpl(GpioPinInput pin) {
054        this.pin = pin;
055    }
056
057    @Override
058    public void handlePinEvent(PinEvent event) {
059        // only process listeners and triggers if the received interrupt event
060        // matches the pin number being tracked my this class instance
061        if (this.pin.getPin().equals(event.getPin())) {
062            if (event.getEventType() == PinEventType.DIGITAL_STATE_CHANGE) {
063                PinState state = ((PinDigitalStateChangeEvent)event).getState();
064
065                // create a copy of the listeners collection
066                Collection<GpioPinListener> listeners  = new ArrayList<>(pin.getListeners());
067
068                // process event callbacks for digital listeners
069                for (GpioPinListener listener : listeners) {
070                    if (listener != null && listener instanceof GpioPinListenerDigital) {
071                        ((GpioPinListenerDigital)listener).handleGpioPinDigitalStateChangeEvent(new GpioPinDigitalStateChangeEvent(event.getSource(), pin, state));
072                    }
073                }
074
075                // create a copy of the triggers collection
076                Collection<GpioTrigger> triggers  = new ArrayList<>(pin.getTriggers());
077
078                // process triggers
079                for (GpioTrigger trigger : triggers) {
080                    if (trigger != null && trigger.hasPinState(state)) {
081                        trigger.invoke(pin, state);
082                    }
083                }
084            } else if(event.getEventType() == PinEventType.ANALOG_VALUE_CHANGE) {
085                double value = ((PinAnalogValueChangeEvent)event).getValue();
086
087                // create a copy of the listeners collection
088                Collection<GpioPinListener> listeners  = new ArrayList<>(pin.getListeners());
089
090                // process event callbacks for analog listeners
091                for (GpioPinListener listener : listeners) {
092                    if (listener != null && listener instanceof GpioPinListenerAnalog) {
093                        ((GpioPinListenerAnalog)listener).handleGpioPinAnalogValueChangeEvent(new GpioPinAnalogValueChangeEvent(event.getSource(), pin, value));
094                    }
095                }
096            }
097        }
098    }
099}