MultiLevelIncreaseDecreaseCommandConverter.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.command;

import org.openhab.core.items.Item;
import org.openhab.core.library.types.IncreaseDecreaseType;
import org.openhab.core.library.types.PercentType;

/**
 * Converts from {@link IncreaseDecreaseType} command to a Z-Wave value.
 *
 * @author Jan-Willem Spuij
 * @since 1.4.0
 */
public class MultiLevelIncreaseDecreaseCommandConverter extends ZWaveCommandConverter<IncreaseDecreaseType, Integer> {

    private static final int DIMMER_STEP_SIZE = 5;

    /**
     * {@inheritDoc}
     */
    @Override
    protected Integer convert(Item item, IncreaseDecreaseType command) {
        int value = ((PercentType) item.getStateAs(PercentType.class)).intValue();

        switch (command) {
            case DECREASE:
                if (value >= 0x63) {
                    value = (((0x63 / DIMMER_STEP_SIZE) + 1) * DIMMER_STEP_SIZE) - DIMMER_STEP_SIZE;
                } else if (value > 0x00) {
                    value -= DIMMER_STEP_SIZE;
                } else {
                    value = 0x00;
                }
                break;
            case INCREASE:
                value += DIMMER_STEP_SIZE;

                if (value >= 0x63) {
                    value = 0x63;
                }
                break;
        }

        return value;
    }

}