RMEGenericBindingProvider.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.rme.internal;

import java.io.InvalidClassException;

import org.openhab.binding.rme.RMEBindingProvider;
import org.openhab.binding.rme.RMEValueSelector;
import org.openhab.core.binding.BindingConfig;
import org.openhab.core.items.Item;
import org.openhab.core.library.items.DimmerItem;
import org.openhab.core.library.items.SwitchItem;
import org.openhab.model.item.binding.AbstractGenericBindingProvider;
import org.openhab.model.item.binding.BindingConfigParseException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * RME bindingconfigurations are very simple and consist of two parts, the name of the serial port
 * and the variable to read
 *
 * Dimmer CisternLevel {rme="/dev/tty12345:WaterLevel"}
 *
 * The variables that can be read from the pump are defined in the RMEValueSelector enum.
 *
 * @author Karel Goderis
 * @since 1.5.0
 */

public class RMEGenericBindingProvider extends AbstractGenericBindingProvider implements RMEBindingProvider {

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

    /**
     * {@inheritDoc}
     */
    public String getBindingType() {
        return "rme";
    }

    /**
     * {@inheritDoc}
     */
    public void validateItemType(Item item, String bindingConfig) throws BindingConfigParseException {
        if (!(item instanceof SwitchItem || item instanceof DimmerItem)) {
            throw new BindingConfigParseException(
                    "item '" + item.getName() + "' is of type '" + item.getClass().getSimpleName()
                            + "', only Switch- and Dimmer Items are allowed - please check your *.items configuration");
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void processBindingConfiguration(String context, Item item, String bindingConfig)
            throws BindingConfigParseException {
        super.processBindingConfiguration(context, item, bindingConfig);

        if (bindingConfig != null) {

            RMEBindingConfig config = new RMEBindingConfig();

            String valueSelectorString = null;

            String[] configParts = bindingConfig.trim().split(":");

            if (configParts.length != 2) {
                throw new BindingConfigParseException("RME binding must contain two parts separated by ':'");
            }

            config.serialPort = configParts[0].trim();
            valueSelectorString = configParts[1].trim();

            try {

                RMEValueSelector.validateBinding(valueSelectorString, item);

                config.valueSelector = RMEValueSelector.getValueSelector(valueSelectorString);

                addBindingConfig(item, config);

            } catch (IllegalArgumentException e1) {
                throw new BindingConfigParseException("Invalid value selector '" + valueSelectorString + "'!");

            } catch (InvalidClassException e1) {
                throw new BindingConfigParseException(
                        "Invalid item type for value selector '" + valueSelectorString + "'!");
            }
        } else {
            logger.warn("bindingConfig is NULL (item=" + item + ") -> processing bindingConfig aborted!");
        }
    }

    class RMEBindingConfig implements BindingConfig {
        String serialPort;
        RMEValueSelector valueSelector;
    }

    public String getSerialPort(String itemName) {
        RMEBindingConfig config = (RMEBindingConfig) bindingConfigs.get(itemName);
        return config != null ? config.serialPort : null;
    }

    public RMEValueSelector getValueSelector(String itemName) {
        RMEBindingConfig config = (RMEBindingConfig) bindingConfigs.get(itemName);
        return config != null ? config.valueSelector : null;
    }

}