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: LeftFunctionDescription.java 3521 2007-10-16 10:55:14Z tmorgner $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031 package org.jfree.formula.function.text;
032
033 import org.jfree.formula.function.AbstractFunctionDescription;
034 import org.jfree.formula.function.FunctionCategory;
035 import org.jfree.formula.typing.Type;
036 import org.jfree.formula.typing.coretypes.NumberType;
037 import org.jfree.formula.typing.coretypes.TextType;
038
039 /**
040 * Describes LeftFunction function.
041 * @see LeftFunction
042 *
043 * @author Cedric Pronzato
044 *
045 */
046 public class LeftFunctionDescription extends AbstractFunctionDescription
047 {
048 public LeftFunctionDescription()
049 {
050 super("org.jfree.formula.function.text.Left-Function");
051 }
052
053 public FunctionCategory getCategory()
054 {
055 return TextFunctionCategory.CATEGORY;
056 }
057
058 public int getParameterCount()
059 {
060 return 2;
061 }
062
063 public Type getParameterType(final int position)
064 {
065 if(position == 0)
066 {
067 return TextType.TYPE;
068 }
069
070 return NumberType.GENERIC_NUMBER;
071 }
072
073 public Type getValueType()
074 {
075 return TextType.TYPE;
076 }
077
078 public boolean isParameterMandatory(final int position)
079 {
080 if(position == 2)
081 {
082 return false;
083 }
084 return true;
085 }
086
087 }