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package com.sun.star.report.pentaho.parser.rpt;

import com.sun.star.report.pentaho.OfficeNamespaces;

import org.jfree.report.expressions.FormulaFunction;
import org.jfree.report.structure.Element;

import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 * Handles the 'report:conditional-print-expression' element that can appear
 * in all report elements and all root-level sections.
 *
 * @author Thomas Morgner
 * @since 02.03.2007
 */
public class ConditionalPrintExpressionReadHandler
        extends AbstractXmlReadHandler
{

    private final Element element;

    public ConditionalPrintExpressionReadHandler(final Element element)
    {
        this.element = element;
    }

    protected void startParsing(final Attributes attrs) throws SAXException
    {
        super.startParsing(attrs);
        final String formula = attrs.getValue(OfficeNamespaces.OOREPORT_NS, "formula");
        if (formula != null)
        {
            final FormulaFunction valueExpression = new FormulaFunction();
            valueExpression.setFormula(formula);
            element.setDisplayCondition(valueExpression);
        }

    }

    /**
     * Returns the object for this element or null, if this element does not
     * create an object.
     *
     * @return the object.
     */
    public Object getObject()
            throws SAXException
    {
        return element;
    }
}