PressureTrendConverter.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.weather.internal.converter.property;

import org.apache.commons.lang.StringUtils;
import org.openhab.binding.weather.internal.converter.Converter;
import org.openhab.binding.weather.internal.converter.ConverterType;

/**
 * Converts pressure trends to values.
 *
 * @author Gerhard Riegler
 * @since 1.7.0
 */

public class PressureTrendConverter implements Converter<String> {
    public static final String TREND_EQUAL = "equal";
    public static final String TREND_UP = "up";
    public static final String TREND_DOWN = "down";

    /**
     * {@inheritDoc}
     */
    @Override
    public String convert(String value) throws Exception {
        if (StringUtils.isBlank(value)) {
            return null;
        } else if ("0".equals(value)) {
            return TREND_EQUAL;
        } else if ("+".equals(value)) {
            return TREND_UP;
        } else if ("-".equals(value)) {
            return TREND_DOWN;
        } else {
            return null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public ConverterType getType() {
        return ConverterType.PRESSURE_TREND;
    }

}