001    /**
002     * =========================================
003     * LibFormula : a free Java formula library
004     * =========================================
005     *
006     * Project Info:  http://reporting.pentaho.org/libformula/
007     *
008     * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009     *
010     * This library is free software; you can redistribute it and/or modify it under the terms
011     * of the GNU Lesser General Public License as published by the Free Software Foundation;
012     * either version 2.1 of the License, or (at your option) any later version.
013     *
014     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016     * See the GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public License along with this
019     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020     * Boston, MA 02111-1307, USA.
021     *
022     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023     * in the United States and other countries.]
024     *
025     *
026     * ------------
027     * $Id: ReptFunction.java 2752 2007-04-10 14:10:41Z taqua $
028     * ------------
029     * (C) Copyright 2006-2007, by Pentaho Corporation.
030     */
031    package org.jfree.formula.function.text;
032    
033    import org.jfree.formula.EvaluationException;
034    import org.jfree.formula.FormulaContext;
035    import org.jfree.formula.LibFormulaErrorValue;
036    import org.jfree.formula.function.Function;
037    import org.jfree.formula.function.ParameterCallback;
038    import org.jfree.formula.lvalues.TypeValuePair;
039    import org.jfree.formula.typing.Type;
040    import org.jfree.formula.typing.TypeRegistry;
041    import org.jfree.formula.typing.coretypes.TextType;
042    
043    /**
044     * This function returns text repeated Count times.
045     *
046     * @author Cedric Pronzato
047     *
048     */
049    public class ReptFunction implements Function
050    {
051      public ReptFunction()
052      {
053      }
054    
055      public TypeValuePair evaluate(final FormulaContext context,
056                                    final ParameterCallback parameters) throws EvaluationException
057      {
058        final int parameterCount = parameters.getParameterCount();
059        if (parameterCount != 2)
060        {
061          throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
062        }
063        final TypeRegistry typeRegistry = context.getTypeRegistry();
064    
065        final Type textType1 = parameters.getType(0);
066        final Object textValue1 = parameters.getValue(0);
067        final Type countType = parameters.getType(1);
068        final Object countValue = parameters.getValue(1);
069    
070        final String text1 = typeRegistry.convertToText(textType1, textValue1);
071        final int count = typeRegistry.convertToNumber(countType, countValue).intValue();
072        if(text1 == null && count >= 0)
073        {
074          throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE);
075        }
076    
077        final StringBuffer buffer = new StringBuffer();
078        for(int i=0; i<count; i++)
079        {
080          buffer.append(text1);
081        }
082        return new TypeValuePair(TextType.TYPE, buffer.toString());
083      }
084    
085      public String getCanonicalName()
086      {
087        return "REPT";
088      }
089    
090    }