/**
* ========================================
* JFreeReport : a free Java report library
* ========================================
*
* Project Info: http://reporting.pentaho.org/
*
* (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: AttrFunction.java 3525 2007-10-16 11:43:48Z tmorgner $
* ------------
* (C) Copyright 2000-2005, by Object Refinery Limited.
* (C) Copyright 2005-2007, by Pentaho Corporation.
*/
package org.jfree.report.expressions.formula.sys;
import org.jfree.formula.EvaluationException;
import org.jfree.formula.FormulaContext;
import org.jfree.formula.LibFormulaErrorValue;
import org.jfree.formula.function.Function;
import org.jfree.formula.function.ParameterCallback;
import org.jfree.formula.lvalues.TypeValuePair;
import org.jfree.formula.typing.coretypes.AnyType;
import org.jfree.formula.typing.coretypes.ErrorType;
import org.jfree.report.expressions.ReportFormulaContext;
import org.jfree.report.structure.Element;
/**
* Creation-Date: 24.11.2006, 13:02:41
*
* @author Thomas Morgner
*/
public class AttrFunction implements Function
{
public AttrFunction()
{
}
public String getCanonicalName()
{
return "ATTR";
}
public TypeValuePair evaluate(final FormulaContext context,
final ParameterCallback parameters)
throws EvaluationException
{
// we expect strings and will check, whether the reference for theses
// strings is dirty.
if (context instanceof ReportFormulaContext == false)
{
return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue
(LibFormulaErrorValue.ERROR_REFERENCE_NOT_RESOLVABLE));
}
final ReportFormulaContext reportFormulaContext =
(ReportFormulaContext) context;
final Object declaringElement = reportFormulaContext.getDeclaringElement();
if (declaringElement instanceof Element == false)
{
return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue
(LibFormulaErrorValue.ERROR_REFERENCE_NOT_RESOLVABLE));
}
final Element element = (Element) declaringElement;
if (parameters.getParameterCount() == 1)
{
final String value = (String) parameters.getValue(0);
return new TypeValuePair(AnyType.TYPE, element.getAttribute(value));
}
else if (parameters.getParameterCount() == 2)
{
final String namespace = (String) parameters.getValue(0);
final String attrName = (String) parameters.getValue(1);
return new TypeValuePair(AnyType.TYPE,
element.getAttribute(namespace, attrName));
}
return new TypeValuePair(ErrorType.TYPE, new LibFormulaErrorValue
(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT));
}
}