MqttItemBinding.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.mqtt.internal;

import org.openhab.binding.mqtt.MqttBindingProvider;
import org.openhab.core.binding.AbstractBinding;
import org.openhab.core.types.Command;
import org.openhab.core.types.State;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MQTT binding to add MQTT send and receive functionality to OpenHab items.
 * This binding receives all commands and state updates and uses the item
 * configuration to publish them to MQTT.
 *
 * @author Davy Vanherbergen
 * @since 1.3.0
 */
public class MqttItemBinding extends AbstractBinding<MqttBindingProvider> {

    private static final Logger logger = LoggerFactory.getLogger(MqttItemBinding.class);

    /**
     * @return MqttBindingProvider implementation.
     */
    private MqttBindingProvider getBindingProvider() {
        return providers.iterator().next();
    }

    @Override
    protected void internalReceiveCommand(String itemName, Command command) {

        MqttItemConfig itemConfig = getBindingProvider().getItemConfig(itemName);

        for (MqttMessagePublisher publisher : itemConfig.getMessagePublishers()) {
            if (publisher.supportsCommand(command)) {
                logger.debug("Publishing command {} to {}", command.toString(), publisher.getTopic());
                publisher.publish(publisher.getTopic(), command.toString().getBytes());
            }
        }
    }

    @Override
    protected void internalReceiveUpdate(String itemName, State newState) {

        MqttItemConfig itemConfig = getBindingProvider().getItemConfig(itemName);

        for (MqttMessagePublisher publisher : itemConfig.getMessagePublishers()) {
            if (publisher.supportsState(newState)) {
                logger.debug("Publishing state {} to {}", newState.toString(), publisher.getTopic());
                publisher.publish(publisher.getTopic(), newState.toString().getBytes());
            }
        }
    }

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

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

}