/*
* $Id: SimpleMathTransformer.java 19366 2010-09-04 03:26:47Z dirk.olmes $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.example.scripting;
import org.mule.api.transformer.DataType;
import org.mule.api.transformer.TransformerException;
import org.mule.config.i18n.MessageFactory;
import org.mule.transformer.AbstractTransformer;
import org.mule.transformer.types.DataTypeFactory;
import org.mule.util.NumberUtils;
/**
* A simple transformer which adds/subtracts/multiplies/divides a constant factor to numeric messages.
*/
public class SimpleMathTransformer extends AbstractTransformer
{
/** Operation to perform: "add", "subtract", "multiply", "divide" */
private String operation = "add";
/** Factor to be applied */
private double factor;
public SimpleMathTransformer()
{
DataType<Number> numberDataType = DataTypeFactory.create(Number.class);
registerSourceType(numberDataType);
setReturnDataType(numberDataType);
}
@Override
public Object doTransform(Object src, String outputEncoding) throws TransformerException
{
double data = NumberUtils.toDouble(src);
if (data == NumberUtils.DOUBLE_ERROR)
{
throw new TransformerException(MessageFactory.createStaticMessage("Unable to convert message to double: " + src));
}
double result;
if (operation.equalsIgnoreCase("add"))
{
result = data + factor;
}
else if (operation.equalsIgnoreCase("subtract"))
{
result = data - factor;
}
else if (operation.equalsIgnoreCase("multiply"))
{
result = data * factor;
}
else if (operation.equalsIgnoreCase("divide"))
{
result = data / factor;
}
else
{
throw new TransformerException(MessageFactory.createStaticMessage("Operation " + operation + " not recognized"));
}
// no auto-boxing
return new Double(result);
}
public String getOperation()
{
return operation;
}
public void setOperation(String operation)
{
this.operation = operation;
}
public double getFactor()
{
return factor;
}
public void setFactor(double factor)
{
this.factor = factor;
}
}