mitm.application.djigzo.james.matchers.ToFloatFunction.java Source code

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Here is the source code for mitm.application.djigzo.james.matchers.ToFloatFunction.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */
package mitm.application.djigzo.james.matchers;

import java.util.ArrayList;

import org.apache.commons.lang.math.NumberUtils;

import net.sourceforge.jeval.ArgumentTokenizer;
import net.sourceforge.jeval.EvaluationConstants;
import net.sourceforge.jeval.Evaluator;
import net.sourceforge.jeval.function.Function;
import net.sourceforge.jeval.function.FunctionConstants;
import net.sourceforge.jeval.function.FunctionException;
import net.sourceforge.jeval.function.FunctionHelper;
import net.sourceforge.jeval.function.FunctionResult;

/**
 * JEval function that converts a string to a double. It requires two argument, a string value that will be converted to a double
 * and a double value that will be used  as the default value if the string cannot be converted to a double
 * 
 * @author Martijn Brinkers
 *
 */
public class ToFloatFunction implements Function {
    @Override
    public String getName() {
        return "toFloat";
    }

    /*
     * Taken from net.sourceforge.jeval.function.FunctionHelper and modified to make it return a double
     */
    public static ArrayList<?> getOneStringAndOneDouble(final String arguments, final char delimiter)
            throws FunctionException {
        ArrayList<Object> returnValues = new ArrayList<Object>();

        try {
            final ArgumentTokenizer tokenizer = new ArgumentTokenizer(arguments, delimiter);

            int tokenCtr = 0;

            while (tokenizer.hasMoreTokens()) {
                if (tokenCtr == 0) {
                    final String token = tokenizer.nextToken();

                    returnValues.add(token);
                } else if (tokenCtr == 1) {
                    final String token = tokenizer.nextToken().trim();
                    returnValues.add(new Double(token));
                } else {
                    throw new FunctionException("Invalid values in string.");
                }

                tokenCtr++;
            }
        } catch (Exception e) {
            throw new FunctionException("Invalid values in string.", e);
        }

        return returnValues;
    }

    @Override
    public FunctionResult execute(Evaluator evaluator, String arguments) throws FunctionException {
        ArrayList<?> values = getOneStringAndOneDouble(arguments, EvaluationConstants.FUNCTION_ARGUMENT_SEPARATOR);

        if (values.size() != 2) {
            throw new FunctionException("A String and a number is required.");
        }
        String stringValue = FunctionHelper.trimAndRemoveQuoteChars((String) values.get(0),
                evaluator.getQuoteCharacter());

        Double value = NumberUtils.toDouble(stringValue, (Double) values.get(1));

        return new FunctionResult(value.toString(), FunctionConstants.FUNCTION_RESULT_TYPE_NUMERIC);
    }
}