RPiRcSwitchBinding.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.rpircswitch.internal;

import java.util.Dictionary;
import java.util.EnumSet;
import java.util.Enumeration;

import org.openhab.binding.rpircswitch.RPiRcSwitchBindingProvider;
import org.openhab.core.binding.AbstractBinding;
import org.openhab.core.library.types.OnOffType;
import org.openhab.core.types.Command;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.pi4j.io.gpio.PinMode;
import com.pi4j.io.gpio.PinPullResistance;
import com.pi4j.io.gpio.RaspiGpioProvider;
import com.pi4j.io.gpio.impl.PinImpl;

import de.pi3g.pi.rcswitch.RCSwitch;

/**
 * <p>
 * Binding listening OpenHAB bus and send commands to RC switches when command
 * is received.
 *
 * @author Matthias Röckl
 * @since 1.8.0
 */
public class RPiRcSwitchBinding extends AbstractBinding<RPiRcSwitchBindingProvider>implements ManagedService {

    private static final Logger LOGGER = LoggerFactory.getLogger(RPiRcSwitchBinding.class);

    private RCSwitch transmitter;

    /*
     * (non-Javadoc)
     *
     * @see org.openhab.core.binding.AbstractBinding#activate()
     */
    @Override
    public void activate() {
        LOGGER.debug("Raspberry Pi RC Switch activated");
    }

    /*
     * (non-Javadoc)
     *
     * @see org.openhab.core.binding.AbstractBinding#deactivate()
     */
    @Override
    public void deactivate() {
        LOGGER.debug("Raspberry Pi RC Switch deactivated");
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.openhab.core.binding.AbstractBinding#internalReceiveCommand(java.
     * lang.String, org.openhab.core.types.Command)
     */
    @Override
    protected void internalReceiveCommand(String itemName, Command command) {
        // Command has been received
        if (itemName != null) {

            // Get the configuration
            RPiRcSwitchBindingConfig config = this.getConfigForItemName(itemName);

            if (config == null) {
                LOGGER.error("No configuration for Raspberry Pi RC Switch available.");
                return;
            }

            // Only OnOffType is supported
            if (command instanceof OnOffType) {
                if (this.transmitter != null) {
                    if (OnOffType.ON.equals(command)) {
                        this.transmitter.switchOn(config.getGroupAddress(), config.getDeviceAddress());
                    } else {
                        this.transmitter.switchOff(config.getGroupAddress(), config.getDeviceAddress());
                    }
                } else {
                    LOGGER.error(
                            "Transmitter has not been initialized. Please configure it correctly in your OpenHAB configuration.");
                }
            } else {
                LOGGER.error("Only On/Off commands are supported.");
            }
        }
    }

    /**
     * Returns the configuration for the item with the given name.
     *
     * @param itemName
     *            the name of the item
     * @return the configuration to use
     */
    protected RPiRcSwitchBindingConfig getConfigForItemName(String itemName) {
        for (RPiRcSwitchBindingProvider provider : this.providers) {
            if (provider.getItemConfig(itemName) != null) {
                return provider.getItemConfig(itemName);
            }
        }
        return null;
    }

    protected void addBindingProvider(RPiRcSwitchBindingProvider bindingProvider) {
        super.addBindingProvider(bindingProvider);
    }

    protected void removeBindingProvider(RPiRcSwitchBindingProvider bindingProvider) {
        super.removeBindingProvider(bindingProvider);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.osgi.service.cm.ManagedService#updated(java.util.Dictionary)
     */
    @Override
    public void updated(Dictionary<String, ?> config) throws ConfigurationException {
        LOGGER.debug("New configuration received");
        if (config != null) {
            Enumeration<String> keys = config.keys();
            while (keys.hasMoreElements()) {
                String key = keys.nextElement();

                if ("service.pid".equals(key)) {
                    continue;
                }

                Object o = config.get("gpioPin");
                if (o instanceof String) {
                    String pinAddressString = (String) o;

                    try {
                        int pinAddress = Integer.parseInt(pinAddressString);
                        PinImpl gpioPin = new PinImpl(RaspiGpioProvider.NAME, pinAddress, "GPIO_" + pinAddress,
                                EnumSet.of(PinMode.DIGITAL_INPUT, PinMode.DIGITAL_OUTPUT), PinPullResistance.all());
                        this.transmitter = new RCSwitch(gpioPin);
                    } catch (NumberFormatException e) {
                        LOGGER.error(
                                "Invalid configuration. Please provide an Integer value in the 'gpioPin' configuration");
                    }
                }
            }
        }
    }

}