Package org.pentaho.reporting.engine.classic.extensions.toc.parser

Source Code of org.pentaho.reporting.engine.classic.extensions.toc.parser.IndexReadHandler

package org.pentaho.reporting.engine.classic.extensions.toc.parser;

import java.util.ArrayList;
import java.util.Map;

import org.pentaho.reporting.engine.classic.core.Element;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.ReportParserUtil;
import org.pentaho.reporting.engine.classic.core.modules.parser.bundle.BundleNamespaces;
import org.pentaho.reporting.engine.classic.core.modules.parser.bundle.layout.SubReportParameterReadHandler;
import org.pentaho.reporting.engine.classic.core.modules.parser.bundle.layout.elements.AbstractElementReadHandler;
import org.pentaho.reporting.engine.classic.extensions.toc.IndexElement;
import org.pentaho.reporting.engine.classic.extensions.toc.TocElement;
import org.pentaho.reporting.libraries.resourceloader.FactoryParameterKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceLoadingException;
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 IndexReadHandler extends AbstractElementReadHandler
{
  private IndexElement report;
  private ArrayList outputParameters;
  private ArrayList inputParameters;

  public IndexReadHandler()
  {
    outputParameters = new ArrayList();
    inputParameters = new ArrayList();
  }

  /**
   * Starts parsing.
   *
   * @param attrs the attributes.
   * @throws org.xml.sax.SAXException if there is a parsing error.
   */
  protected void startParsing(final Attributes attrs) throws SAXException
  {
    final String file = attrs.getValue(getUri(), "href");
    if (file != null)
    {
      final Map parameters = deriveParseParameters();
      parameters.put(new FactoryParameterKey(ReportParserUtil.HELPER_OBJ_REPORT_NAME), null);
      parameters.put(new FactoryParameterKey
          (ReportParserUtil.INCLUDE_PARSING_KEY), ReportParserUtil.INCLUDE_PARSING_VALUE);
      try
      {
        report = (IndexElement) performExternalParsing(file, IndexElement.class, parameters);
      }
      catch (ResourceLoadingException e)
      {
        throw new ParseException("The specified subreport was not found or could not be loaded.", e);
      }
    }
    else
    {
      throw new ParseException("Required attribute 'href' is missing.", getLocator());
    }

    initialize("index");
    super.startParsing(attrs);

    // clear the href, this is used only for internal purposes ...
    report.setAttribute(getUri(), "href", null);
  }

  protected Element createElement(final String elementType) throws ParseException
  {
    if (report == null)
    {
      throw new IllegalStateException();
    }
    return report;
  }

  /**
   * 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 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 (BundleNamespaces.LAYOUT.equals(uri))
    {
      if ("output-parameter".equals(tagName))
      {
        final SubReportParameterReadHandler parameterReadHandler = new SubReportParameterReadHandler();
        outputParameters.add(parameterReadHandler);
        return parameterReadHandler;
      }
      if ("input-parameter".equals(tagName))
      {
        final SubReportParameterReadHandler parameterReadHandler = new SubReportParameterReadHandler();
        inputParameters.add(parameterReadHandler);
        return parameterReadHandler;
      }
    }
    return super.getHandlerForChild(uri, tagName, atts);
  }

  public Element getElement()
  {
    return report;
  }

  /**
   * Done parsing.
   *
   * @throws org.xml.sax.SAXException if there is a parsing error.
   */
  protected void doneParsing() throws SAXException
  {
    super.doneParsing();
    for (int i = 0; i < inputParameters.size(); i++)
    {
      final SubReportParameterReadHandler handler = (SubReportParameterReadHandler) inputParameters.get(i);
      report.addInputParameter(handler.getMasterName(), handler.getDetailName());
    }

    for (int i = 0; i < outputParameters.size(); i++)
    {
      final SubReportParameterReadHandler handler = (SubReportParameterReadHandler) outputParameters.get(i);
      report.addExportParameter(handler.getMasterName(), handler.getDetailName());
    }
  }

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