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1: /** 2: * ========================================= 3: * LibFormula : a free Java formula library 4: * ========================================= 5: * 6: * Project Info: http://reporting.pentaho.org/libformula/ 7: * 8: * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 9: * 10: * This library is free software; you can redistribute it and/or modify it under the terms 11: * of the GNU Lesser General Public License as published by the Free Software Foundation; 12: * either version 2.1 of the License, or (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 16: * See the GNU Lesser General Public License for more details. 17: * 18: * You should have received a copy of the GNU Lesser General Public License along with this 19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 20: * Boston, MA 02111-1307, USA. 21: * 22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 23: * in the United States and other countries.] 24: * 25: * 26: * ------------ 27: * $Id: HasChangedFunctionDescription.java 3521 2007-10-16 10:55:14Z tmorgner $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: 32: package org.jfree.formula.function.information; 33: 34: import org.jfree.formula.function.AbstractFunctionDescription; 35: import org.jfree.formula.function.FunctionCategory; 36: import org.jfree.formula.typing.Type; 37: import org.jfree.formula.typing.coretypes.LogicalType; 38: import org.jfree.formula.typing.coretypes.TextType; 39: 40: /** 41: * Creation-Date: 31.10.2006, 17:41:12 42: * 43: * @author Thomas Morgner 44: */ 45: public class HasChangedFunctionDescription extends AbstractFunctionDescription 46: { 47: public HasChangedFunctionDescription() 48: { 49: super("org.jfree.formula.function.information.HasChanged-Function"); 50: } 51: 52: public Type getValueType() 53: { 54: return LogicalType.TYPE; 55: } 56: 57: public int getParameterCount() 58: { 59: return 1; 60: } 61: 62: public boolean isInfiniteParameterCount() 63: { 64: return true; 65: } 66: 67: public Type getParameterType(final int position) 68: { 69: return TextType.TYPE; 70: } 71: 72: /** 73: * Defines, whether the parameter at the given position is mandatory. A 74: * mandatory parameter must be filled in, while optional parameters need not 75: * to be filled in. 76: * 77: * @return false 78: */ 79: public boolean isParameterMandatory(final int position) 80: { 81: return false; 82: } 83: 84: /** 85: * Returns the default value for an optional parameter. If the value returned 86: * here is null, then this either means, that the parameter is mandatory or 87: * that the default value is computed by the expression itself. 88: * 89: * @param position 90: * @return null. 91: */ 92: public Object getDefaultValue(final int position) 93: { 94: return null; 95: } 96: 97: public boolean isVolatile() 98: { 99: return true; 100: } 101: 102: public FunctionCategory getCategory() 103: { 104: return InformationFunctionCategory.CATEGORY; 105: } 106: }