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: http://www.pi4j.com/ 012 * ********************************************************************** 013 * %% 014 * Copyright (C) 2012 - 2013 Pi4J 015 * %% 016 * Licensed under the Apache License, Version 2.0 (the "License"); you 017 * may not use this file except in compliance with the License. You may obtain a copy of the License 018 * at 019 * 020 * http://www.apache.org/licenses/LICENSE-2.0 021 * 022 * Unless required by applicable law or agreed to in writing, software distributed under the License 023 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 024 * or implied. See the License for the specific language governing permissions and limitations under 025 * the License. 026 * #L% 027 */ 028 029import com.pi4j.io.gpio.GpioPinInput; 030import com.pi4j.io.gpio.PinState; 031import com.pi4j.io.gpio.event.GpioPinListener; 032import com.pi4j.io.gpio.event.GpioPinAnalogValueChangeEvent; 033import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent; 034import com.pi4j.io.gpio.event.GpioPinListenerAnalog; 035import com.pi4j.io.gpio.event.GpioPinListenerDigital; 036import com.pi4j.io.gpio.event.PinAnalogValueChangeEvent; 037import com.pi4j.io.gpio.event.PinEvent; 038import com.pi4j.io.gpio.event.PinEventType; 039import com.pi4j.io.gpio.event.PinDigitalStateChangeEvent; 040import com.pi4j.io.gpio.event.PinListener; 041import com.pi4j.io.gpio.trigger.GpioTrigger; 042 043public class GpioEventMonitorImpl implements PinListener { 044 private final GpioPinInput pin; 045 046 public GpioEventMonitorImpl(GpioPinInput pin) { 047 this.pin = pin; 048 } 049 050 @Override 051 public void handlePinEvent(PinEvent event) { 052 // only process listeners and triggers if the received interrupt event 053 // matches the pin number being tracked my this class instance 054 if (this.pin.getPin().equals(event.getPin())) { 055 if (event.getEventType() == PinEventType.DIGITAL_STATE_CHANGE) { 056 PinState state = ((PinDigitalStateChangeEvent)event).getState(); 057 058 // process event callbacks for digital listeners 059 for (GpioPinListener listener : pin.getListeners()) { 060 if (listener instanceof GpioPinListenerDigital) { 061 ((GpioPinListenerDigital)listener).handleGpioPinDigitalStateChangeEvent(new GpioPinDigitalStateChangeEvent(event.getSource(), pin, state)); 062 } 063 } 064 065 // process triggers 066 for (GpioTrigger trigger : pin.getTriggers()) { 067 if (trigger.hasPinState(state)) { 068 trigger.invoke(pin, state); 069 } 070 } 071 } else if(event.getEventType() == PinEventType.ANALOG_VALUE_CHANGE) { 072 double value = ((PinAnalogValueChangeEvent)event).getValue(); 073 074 // process event callbacks for analog listeners 075 for (GpioPinListener listener : pin.getListeners()) { 076 if (listener instanceof GpioPinListenerAnalog) { 077 ((GpioPinListenerAnalog)listener).handleGpioPinAnalogValueChangeEvent(new GpioPinAnalogValueChangeEvent(event.getSource(), pin, value)); 078 } 079 } 080 } 081 } 082 } 083}