StateUtils.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.ebus.internal.utils;

import java.math.BigDecimal;

import org.openhab.core.library.types.DecimalType;
import org.openhab.core.library.types.OnOffType;
import org.openhab.core.library.types.StringType;
import org.openhab.core.types.Command;
import org.openhab.core.types.State;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A utility class for openhab states.
 *
 * @author Christian Sowada
 * @since 1.7.0
 */
public class StateUtils {

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

    /**
     * Converts an openhab command to a native java datatype
     * 
     * @param command
     * @return
     */
    public static Object convertFromState(Command command) {

        if (command == OnOffType.ON) {
            return Boolean.TRUE;

        } else if (command == OnOffType.OFF) {
            return Boolean.FALSE;

        } else if (command instanceof DecimalType) {
            return ((DecimalType) command).toBigDecimal();

        }

        throw new RuntimeException("Sorry, data type " + command.toString() + " not supported ...");
    }

    /**
     * Converts a value to a openhab state
     * 
     * @param value A value to converrt
     * @return A converted state or null
     */
    public static State convertToState(Object value) {

        if (value instanceof BigDecimal) {
            return new DecimalType((BigDecimal) value);

        } else if (value instanceof Boolean) {
            return (Boolean) value ? OnOffType.ON : OnOffType.OFF;

        } else if (value instanceof String) {
            return new StringType((String) value);

        } else if (value == null) {
            return null;

        } else {
            logger.error("Unknown data type!");
            return null;
        }
    }

}