/*!
* 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) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

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

import org.pentaho.reporting.engine.classic.core.metadata.parser.AbstractMetaDataReadHandler;
import org.pentaho.reporting.engine.classic.extensions.drilldown.DrillDownProfile;
import org.pentaho.reporting.engine.classic.extensions.drilldown.LinkCustomizer;
import org.pentaho.reporting.engine.classic.extensions.drilldown.PatternLinkCustomizer;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.pentaho.reporting.libraries.xmlns.parser.PropertyReadHandler;
import org.pentaho.reporting.libraries.xmlns.parser.XmlReadHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import java.util.ArrayList;
import java.util.HashMap;

public class DrillDownProfileReadHandler extends AbstractMetaDataReadHandler {
  private ArrayList<PropertyReadHandler> attributes;
  private Class linkCustomizerType;
  private String prefix;

  private String group;

  public DrillDownProfileReadHandler( final String group ) {
    this.group = group;
    attributes = new ArrayList<PropertyReadHandler>();
  }

  /**
   * 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 valueTypeText = attrs.getValue( getUri(), "class" ); // NON-NLS
    if ( valueTypeText != null ) {
      try {
        final ClassLoader loader = ObjectUtilities.getClassLoader( DrillDownProfileReadHandler.class );
        linkCustomizerType = Class.forName( valueTypeText, false, loader );
        if ( LinkCustomizer.class.isAssignableFrom( linkCustomizerType ) == false ) {
          //noinspection ThrowCaughtLocally
          throw new ParseException( "Attribute 'class' is not valid", getLocator() ); // NON-NLS
        }
      } catch ( ParseException pe ) {
        throw pe;
      } catch ( Exception e ) {
        throw new ParseException( "Attribute 'class' is not valid", e, getLocator() ); // NON-NLS
      }
    } else {
      linkCustomizerType = PatternLinkCustomizer.class;
    }
    prefix = "drilldown-profile."; // NON-NLS
  }

  /**
   * 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 ( isSameNamespace( uri ) == false ) {
      return null;
    }
    if ( "attribute".equals( tagName ) ) // NON-NLS
    {
      final PropertyReadHandler propertyReadHandler = new PropertyReadHandler();
      attributes.add( propertyReadHandler );
      return propertyReadHandler;
    }
    return super.getHandlerForChild( uri, tagName, atts );
  }

  /**
   * 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 {
    final HashMap<String, String> attrMap = new HashMap<String, String>();
    for ( int i = 0; i < attributes.size(); i++ ) {
      final PropertyReadHandler readHandler = attributes.get( i );
      attrMap.put( readHandler.getName(), readHandler.getResult() );
    }
    attrMap.put( "group", group ); // NON-NLS
    return new DrillDownProfile
      ( getName(), getBundle(), prefix, isExpert(), isPreferred(), isHidden(), isDeprecated(), linkCustomizerType,
        attrMap, getMaturityLevel(), -1 );
  }
}