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package com.sun.star.report.pentaho.styles;

import java.util.ArrayList;

import java.util.List;
import org.pentaho.reporting.libraries.xmlns.parser.AbstractXmlReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;

/**
 * Todo: Document me!
 *
 * @author Thomas Morgner
 * @since 12.03.2007
 */
public class StyleMappingDocumentReadHandler extends AbstractXmlReadHandler
{

    private final StyleMapper styleMapper;
    private final List mappings;

    public StyleMappingDocumentReadHandler()
    {
        this.mappings = new ArrayList();
        this.styleMapper = new StyleMapper();
    }

    /**
     * Returns the handler for a child element.
     *
     * @param tagName the tag name.
     * @param atts    the attributes.
     * @return the handler or null, if the tagname is invalid.
     *
     * @throws org.xml.sax.SAXException if there is a parsing error.
     */
    protected XmlReadHandler getHandlerForChild(final String uri,
            final String tagName,
            final Attributes atts)
            throws SAXException
    {
        if (isSameNamespace(uri) && "mapping".equals(tagName))
        {
            final StyleMappingReadHandler smr = new StyleMappingReadHandler();
            mappings.add(smr);
            return smr;
        }
        return null;
    }

    /**
     * Done parsing.
     *
     * @throws org.xml.sax.SAXException if there is a parsing error.
     */
    protected void doneParsing()
            throws SAXException
    {
        for (int i = 0; i < mappings.size(); i++)
        {
            final StyleMappingReadHandler handler =
                    (StyleMappingReadHandler) mappings.get(i);
            styleMapper.addMapping(handler.getRule());
        }
    }

    /**
     * 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 styleMapper;
    }
}