/*!
 * 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.core.modules.parser.ext.readhandlers;

import org.pentaho.reporting.engine.classic.core.modules.parser.base.PropertyAttributes;
import org.pentaho.reporting.engine.classic.core.modules.parser.base.common.AbstractPropertyXmlReadHandler;
import org.pentaho.reporting.engine.classic.core.style.ElementStyleSheet;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.xml.sax.SAXException;

import java.util.HashMap;

public class StyleExtendsReadHandler extends AbstractPropertyXmlReadHandler {
  private HashMap<String, ElementStyleSheet> styleSheetCollection;
  private ElementStyleSheet styleSheet;

  public StyleExtendsReadHandler( final HashMap<String, ElementStyleSheet> styleSheetCollection,
      final ElementStyleSheet styleSheet ) {
    this.styleSheetCollection = styleSheetCollection;
    this.styleSheet = styleSheet;
  }

  /**
   * Starts parsing.
   *
   * @param attrs
   *          the attributes.
   * @throws org.xml.sax.SAXException
   *           if there is a parsing error.
   */
  protected void startParsing( final PropertyAttributes attrs ) throws SAXException {
    final String name = attrs.getValue( getUri(), "name" );
    if ( name == null ) {
      throw new ParseException( "Required attribute 'name' is missing.", getRootHandler().getDocumentLocator() );
    }
    final ElementStyleSheet parent = styleSheetCollection.get( name );
    if ( parent == null ) {
      throw new ParseException( "Specified parent stylesheet is not defined.", getRootHandler().getDocumentLocator() );
    }
    styleSheet.addDefault( parent );
  }

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