TruncateFunctionEvaluator.java

/*******************************************************************************
 * Copyright (c) 2004, 2012 BREDEX GmbH.
 * 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:
 *     BREDEX GmbH - initial API and implementation and/or initial documentation
 *******************************************************************************/
package org.eclipse.jubula.client.core.functions;

import java.math.BigDecimal;
import java.math.RoundingMode;

import org.eclipse.jubula.tools.internal.exception.InvalidDataException;


/**
 * Function that truncates a number a certain number of characters after the
 * decimal point.
 */
public class TruncateFunctionEvaluator extends AbstractFunctionEvaluator {

    /**
     * {@inheritDoc}
     */
    public String evaluate(String[] arguments) throws InvalidDataException {
        validateParamCount(arguments, 2);
        BigDecimal toTruncate = new BigDecimal(arguments[0]);
        int precision = Integer.parseInt(arguments[1]);

        BigDecimal truncated = 
                toTruncate.setScale(precision, RoundingMode.DOWN);
        
        return truncated.toPlainString();
    }

}