StateComparator.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.zwave.internal.converter.state;

import java.util.Comparator;

import org.openhab.core.library.types.DecimalType;
import org.openhab.core.types.State;

/**
 * State Comparator class. Compares two States to determine which one is more
 * specific.
 *
 * @author Jan-Willem Spuij
 * @since 1.4.0
 */
public class StateComparator implements Comparator<Class<? extends State>> {

    /**
     * {@inheritDoc}
     */
    @Override
    public int compare(Class<? extends State> o1, Class<? extends State> o2) {

        // right now Decimal Types take precedence over things like Up/Down or On/Off types.

        if (DecimalType.class.isAssignableFrom(o1)) {
            return DecimalType.class.isAssignableFrom(o2) ? 0 : -1;
        }

        if (DecimalType.class.isAssignableFrom(o2)) {
            return DecimalType.class.isAssignableFrom(o1) ? 0 : 1;
        }

        return 0;
    }
}