/*
 * 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) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors..  All rights reserved.
 */

package org.pentaho.reporting.engine.classic.core.metadata.parser;

import org.pentaho.reporting.engine.classic.core.metadata.DataFactoryCore;
import org.pentaho.reporting.engine.classic.core.metadata.DefaultDataFactoryCore;
import org.pentaho.reporting.engine.classic.core.metadata.DefaultDataFactoryMetaData;
import org.pentaho.reporting.engine.classic.core.metadata.builder.DataFactoryMetaDataBuilder;
import org.pentaho.reporting.libraries.base.util.ObjectUtilities;
import org.pentaho.reporting.libraries.xmlns.parser.ParseException;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

public class DataFactoryReadHandler extends AbstractMetaDataReadHandler {
  private DataFactoryMetaDataBuilder builder;

  public DataFactoryReadHandler() {
    builder = new DataFactoryMetaDataBuilder();
  }

  public DataFactoryMetaDataBuilder getBuilder() {
    return builder;
  }

  /**
   * 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 editable = attrs.getValue( getUri(), "editable" ); // NON-NLS
    getBuilder().editable( editable == null || "true".equals( editable ) );
    getBuilder().freeformQuery( "true".equals( attrs.getValue( getUri(), "freeform-query" ) ) ); // NON-NLS
    getBuilder().formattingMetadataSource( "true".equals( attrs.getValue( getUri(), "metadata-source" ) ) ); // NON-NLS
    getBuilder().dataFactoryCore( parseDataFactoryCore( attrs ) );
    getBuilder().bundle( getBundle(), parseKeyPrefix( attrs ) );
  }

  private String parseKeyPrefix( final Attributes attrs ) {
    String keyPrefix = attrs.getValue( getUri(), "key-prefix" ); // NON-NLS
    if ( keyPrefix == null ) {
      keyPrefix = "";
    }
    return keyPrefix;
  }

  private DataFactoryCore parseDataFactoryCore( final Attributes attrs ) throws ParseException {
    final String metaDataCoreClass = attrs.getValue( getUri(), "impl" ); // NON-NLS
    if ( metaDataCoreClass != null ) {
      DataFactoryCore dataFactoryCore =
          ObjectUtilities.loadAndInstantiate( metaDataCoreClass, DataFactoryReadHandler.class, DataFactoryCore.class );
      if ( dataFactoryCore == null ) {
        throw new ParseException( "Attribute 'impl' references a invalid DataFactoryPropertyCore implementation.",
            getLocator() );
      }
      return dataFactoryCore;
    } else {
      return new DefaultDataFactoryCore();
    }
  }

  /**
   * Done parsing.
   *
   * @throws SAXException
   *           if there is a parsing error.
   */
  protected void doneParsing() throws SAXException {
  }

  /**
   * 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 {
    return new DefaultDataFactoryMetaData( getBuilder() );
  }
}