platform/southbound/mqtt/smart-topic-device/src/main/java/org/eclipse/sensinact/gateway/sthbnd/mqtt/smarttopic/processor/formats/ProcessorFormatMultiply.java

/*
* Copyright (c) 2020 Kentyou.
 * 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
 *
 * Contributors:
*    Kentyou - initial API and implementation
 */
package org.eclipse.sensinact.gateway.sthbnd.mqtt.smarttopic.processor.formats;

import org.eclipse.sensinact.gateway.sthbnd.mqtt.smarttopic.processor.formats.exception.ProcessorFormatException;
import org.eclipse.sensinact.gateway.sthbnd.mqtt.smarttopic.processor.formats.iface.ProcessorFormatIface;
import org.eclipse.sensinact.gateway.sthbnd.mqtt.smarttopic.processor.selector.SelectorIface;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Stateless class that is capable of interprete a given format.
 *
 * @author <a href="mailto:Jander.BOTELHODONASCIMENTO@cea.fr">Jander Botelho do Nascimento</a>
 */
public class ProcessorFormatMultiply implements ProcessorFormatIface {
    private static final Logger LOG = LoggerFactory.getLogger(ProcessorFormatMultiply.class);

    @Override
    public String getName() {
        return "multiply";
    }

    @Override
    public String process(String inData, SelectorIface selector) throws ProcessorFormatException {
        try {
            final String expression = selector.getExpression();
            try {
                Float inDataValue = new Float(inData);
                Float value = new Float(expression);
                return Float.valueOf(inDataValue * value).toString();
            } catch (NumberFormatException e) {
                return inData.concat(selector.getExpression());
            }
        } catch (Exception e) {
            LOG.error("Failed to apply {} filter. Bypassing filter", getName(), e);
            return inData;
        }
    }
}