/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2008 - 2009 Pentaho Corporation, . All rights reserved.
*/
package org.pentaho.reporting.engine.classic.extensions.parsers.reportdesigner.datasets;
import java.beans.IntrospectionException;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.engine.classic.core.function.FormulaExpression;
import org.pentaho.reporting.engine.classic.core.function.FormulaFunction;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.compat.CompatibilityMapperUtil;
import org.pentaho.reporting.engine.classic.core.util.beans.BeanUtility;
import org.pentaho.reporting.engine.classic.extensions.parsers.reportdesigner.ReportDesignerParserUtil;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.IgnoreAnyChildReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class ReportFunctionReadHandler extends AbstractXmlReadHandler
{
private Expression expression;
private BeanUtility beanUtility;
public ReportFunctionReadHandler()
{
}
/**
* Starts parsing.
*
* @param attrs the attributes.
* @throws SAXException if there is a parsing error.
*/
protected void startParsing(final Attributes attrs) throws SAXException
{
super.startParsing(attrs);
final String type = attrs.getValue(getUri(), "type");
if (type.endsWith("_DesignerWrapper") == false)
{
throw new ParseException("Magic-Token not found");
}
final String realType = CompatibilityMapperUtil.mapClassName
(type.substring(0, type.length() - "_DesignerWrapper".length()));
final Object expression = ObjectUtilities.loadAndInstantiate
(realType, ReportFunctionReadHandler.class, Expression.class);
if (expression == null)
{
throw new ParseException("Specified expression does not exist");
}
try
{
this.expression = (Expression) expression;
this.beanUtility = new BeanUtility(expression);
}
catch (IntrospectionException e)
{
throw new ParseException("Specified expression cannot be beaned");
}
}
/**
* Returns the handler for a child element.
*
* @param uri the URI of the namespace of the current element.
* @param tagName the tag name.
* @param atts the attributes.
* @return the handler or null, if the tagname is invalid.
* @throws SAXException if there is a parsing error.
*/
protected XmlReadHandler getHandlerForChild(final String uri,
final String tagName,
final Attributes atts) throws SAXException
{
if (isSameNamespace(uri) == false)
{
return null;
}
if ("padding".equals(tagName))
{
return new IgnoreAnyChildReadHandler();
}
if ("property".equals(tagName))
{
return new DesignerExpressionPropertyReadHandler(beanUtility, expression.getName());
}
return super.getHandlerForChild(uri, tagName, atts);
}
/**
* Done parsing.
*
* @throws org.xml.sax.SAXException if there is a parsing error.
*/
protected void doneParsing() throws SAXException
{
if (expression instanceof FormulaExpression)
{
final FormulaExpression formulaExpression = (FormulaExpression) expression;
formulaExpression.setFormula(ReportDesignerParserUtil.normalizeFormula(formulaExpression.getFormula()));
}
else if (expression instanceof FormulaFunction)
{
final FormulaFunction formulaFunction = (FormulaFunction) expression;
formulaFunction.setFormula(ReportDesignerParserUtil.normalizeFormula(formulaFunction.getFormula()));
formulaFunction.setInitial(ReportDesignerParserUtil.normalizeFormula(formulaFunction.getInitial()));
}
}
public Expression getExpression()
{
return expression;
}
/**
* Returns the object for this element or null, if this element does
* not create an object.
*
* @return the object.
* @throws SAXException if an parser error occured.
*/
public Object getObject() throws SAXException
{
return expression;
}
}