MqttItemConfig.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 java.util.ArrayList;
import java.util.List;

import org.openhab.core.binding.BindingConfig;
import org.openhab.core.items.Item;
import org.openhab.model.item.binding.BindingConfigParseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MQTT configuration for an openHAB item. An item's MQTT configuration can
 * contain multiple inbound or outbound message configurations.
 *
 * @author Davy Vanherbergen
 * @since 1.3.0
 */
public class MqttItemConfig implements BindingConfig {

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

    private List<MqttMessagePublisher> publishConfigurations = new ArrayList<MqttMessagePublisher>();

    private List<MqttMessageSubscriber> subscribeConfigurations = new ArrayList<MqttMessageSubscriber>();

    /**
     * Create new MQTT binding configuration for the given item.
     * 
     * @param itemName
     *            item name.
     * @param bindingConfig
     *            configuration string
     * @throws BindingConfigParseException
     *             If the configuration string is invalid.
     */
    public MqttItemConfig(Item item, String bindingConfig) throws BindingConfigParseException {

        String[] configurationStrings = bindingConfig.split("],");

        for (String config : configurationStrings) {
            config = config.trim();
            String type = config.substring(0, 1);
            int firstPos = config.indexOf('[');
            int lastPos = config.lastIndexOf(']');

            String configContent = config.substring(firstPos + 1);
            if (lastPos != -1) {
                configContent = config.substring(firstPos + 1, lastPos);
            }

            if (type.equals("<")) {
                MqttMessageSubscriber subscribeConfig = new MqttMessageSubscriber(configContent, item);
                subscribeConfigurations.add(subscribeConfig);
            } else if (type.equals(">")) {
                MqttMessagePublisher publishConfig = new MqttMessagePublisher(configContent);
                publishConfigurations.add(publishConfig);
            } else {
                throw new BindingConfigParseException(
                        "Invalid mqtt binding configuration '" + configContent + "' for item " + item.getName());
            }
        }

        logger.debug("Loaded MQTT config for item '{}' : {} subscribers, {} publishers",
                new Object[] { item.getName(), subscribeConfigurations.size(), publishConfigurations.size() });
    }

    /**
     * @return List of all defined publish configurations for the item.
     */
    public List<MqttMessagePublisher> getMessagePublishers() {
        return publishConfigurations;
    }

    /**
     * @return List of all defined subscribe configurations for the item.
     */
    public List<MqttMessageSubscriber> getMessageSubscribers() {
        return subscribeConfigurations;
    }

}