001 /** 002 * ======================================== 003 * JFreeReport : a free Java report library 004 * ======================================== 005 * 006 * Project Info: http://reporting.pentaho.org/ 007 * 008 * (C) Copyright 2000-2007, by Object Refinery Limited, 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 * $Id: AttrFunction.java 3525 2007-10-16 11:43:48Z tmorgner $ 027 * ------------ 028 * (C) Copyright 2000-2005, by Object Refinery Limited. 029 * (C) Copyright 2005-2007, by Pentaho Corporation. 030 */ 031 032 package org.jfree.report.expressions.formula.sys; 033 034 import org.jfree.formula.EvaluationException; 035 import org.jfree.formula.FormulaContext; 036 import org.jfree.formula.LibFormulaErrorValue; 037 import org.jfree.formula.function.Function; 038 import org.jfree.formula.function.ParameterCallback; 039 import org.jfree.formula.lvalues.TypeValuePair; 040 import org.jfree.formula.typing.coretypes.AnyType; 041 import org.jfree.formula.typing.coretypes.ErrorType; 042 import org.jfree.report.expressions.ReportFormulaContext; 043 import org.jfree.report.structure.Element; 044 045 /** 046 * Creation-Date: 24.11.2006, 13:02:41 047 * 048 * @author Thomas Morgner 049 */ 050 public class AttrFunction implements Function 051 { 052 public AttrFunction() 053 { 054 } 055 056 public String getCanonicalName() 057 { 058 return "ATTR"; 059 } 060 061 public TypeValuePair evaluate(final FormulaContext context, 062 final ParameterCallback parameters) 063 throws EvaluationException 064 { 065 // we expect strings and will check, whether the reference for theses 066 // strings is dirty. 067 if (context instanceof ReportFormulaContext == false) 068 { 069 return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue 070 (LibFormulaErrorValue.ERROR_REFERENCE_NOT_RESOLVABLE)); 071 } 072 073 final ReportFormulaContext reportFormulaContext = 074 (ReportFormulaContext) context; 075 final Object declaringElement = reportFormulaContext.getDeclaringElement(); 076 if (declaringElement instanceof Element == false) 077 { 078 return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue 079 (LibFormulaErrorValue.ERROR_REFERENCE_NOT_RESOLVABLE)); 080 } 081 082 final Element element = (Element) declaringElement; 083 084 if (parameters.getParameterCount() == 1) 085 { 086 final String value = (String) parameters.getValue(0); 087 return new TypeValuePair(AnyType.TYPE, element.getAttribute(value)); 088 } 089 else if (parameters.getParameterCount() == 2) 090 { 091 final String namespace = (String) parameters.getValue(0); 092 final String attrName = (String) parameters.getValue(1); 093 return new TypeValuePair(AnyType.TYPE, 094 element.getAttribute(namespace, attrName)); 095 } 096 return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue 097 (LibFormulaErrorValue.ERROR_INVALID_ARGUMENT)); 098 } 099 100 }