/*
* 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.report;
import org.pentaho.reporting.engine.classic.core.function.FormulaExpression;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.PropertyReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.pentaho.reporting.libraries.base.util.StringUtils;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Todo: Document Me
*
* @author Thomas Morgner
*/
public class FormulaReadHandler extends AbstractXmlReadHandler
{
private PropertyReadHandler propertyReadHandler;
public FormulaReadHandler()
{
}
/**
* 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 ("property".equals(tagName) && "text".equals(atts.getValue(uri, "name")))
{
propertyReadHandler = new PropertyReadHandler();
return propertyReadHandler;
}
return null;
}
/**
* 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 Expression getFormula() throws SAXException
{
if (propertyReadHandler == null)
{
return null;
}
String s = propertyReadHandler.getResult();
if (StringUtils.isEmpty(s, true) == false)
{
final FormulaExpression formulaExpression = new FormulaExpression();
if (s.startsWith("report:"))
{
s = "=" + s.substring("report:".length()).trim();
}
else
{
s = s.trim();
}
if (s.endsWith(";"))
{
s = s.substring(0, s.length() - 1);
}
formulaExpression.setFormula(s);
return formulaExpression;
}
return null;
}
/**
* 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 getFormula();
}
}