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This bundle wraps Pi4j (http://pi4j.com) that wraps the native code Wiring Pi (http://wiringpi.com). It wraps these libraries to make them OSGi friendly and allow them to work together with the OSGi enRoute IoT circuit library (osgi.enroute.iot.circuit). The bundle will first use Pi4J to detect on what hardware it runs. If it runs on an appropriate type, it will register a component that can be configured with Metatype. The Metatype defines a full blown configuration template for all the Pi's functions. The GPIO's are registered as components for the circuit. Regardless of the success of the configuration, this bundle will also register a GpioController service, which is the main Pi4J class.

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package com.pi4j.io.gpio.tasks.impl;

/*
 * #%L
 * **********************************************************************
 * ORGANIZATION  :  Pi4J
 * PROJECT       :  Pi4J :: Java Library (Core)
 * FILENAME      :  GpioEventDispatchTaskImpl.java  
 * 
 * This file is part of the Pi4J project. More information about 
 * this project can be found here:  http://www.pi4j.com/
 * **********************************************************************
 * %%
 * Copyright (C) 2012 - 2015 Pi4J
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */


import com.pi4j.io.gpio.GpioPinInput;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.event.*;
import com.pi4j.io.gpio.trigger.GpioTrigger;

import java.util.ArrayList;
import java.util.Collection;

public class GpioEventDispatchTaskImpl implements Runnable {

    private final GpioPinInput pin;
    private final PinEvent event;

    public GpioEventDispatchTaskImpl(GpioPinInput pin, PinEvent event) {
        this.event = event;
        this.pin = pin;
    }

    @Override
    public void run() {
        // only process listeners and triggers if the received interrupt event
        // matches the pin number being tracked my this class instance
        if (this.pin.getPin().equals(event.getPin())) {
            if (event.getEventType() == PinEventType.DIGITAL_STATE_CHANGE) {
                PinState state = ((PinDigitalStateChangeEvent) event).getState();

                // create a copy of the listeners collection
                Collection listeners  = new ArrayList(pin.getListeners());

                // process event callbacks for digital listeners
                for (GpioPinListener listener : listeners) {
                    if(listener != null && listener instanceof GpioPinListenerDigital) {
                        ((GpioPinListenerDigital) listener)
                            .handleGpioPinDigitalStateChangeEvent(new GpioPinDigitalStateChangeEvent(
                                    event.getSource(), pin, state));
                    }
                }

                // create a copy of the triggers collection
                Collection triggers  = new ArrayList(pin.getTriggers());

                // process triggers
                for (GpioTrigger trigger : triggers) {
                    if (trigger != null && trigger.hasPinState(state)) {
                        trigger.invoke(pin, state);
                    }
                }
            } else if (event.getEventType() == PinEventType.ANALOG_VALUE_CHANGE) {
                double value = ((PinAnalogValueChangeEvent) event).getValue();

                // create a copy of the listeners collection
                Collection listeners  = new ArrayList(pin.getListeners());

                // process event callbacks for analog listeners
                for (GpioPinListener listener : listeners) {
                    if (listener != null && listener instanceof GpioPinListenerAnalog) {
                        ((GpioPinListenerAnalog) listener)
                            .handleGpioPinAnalogValueChangeEvent(new GpioPinAnalogValueChangeEvent(
                                    event.getSource(), pin, value));
                    }
                }
            }
        }
    }
}