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   * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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 General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  // XMLFilter.java - filter SAX2 events.
  // http://www.saxproject.org
  // Written by David Megginson
  // NO WARRANTY!  This class is in the Public Domain.
  // $Id: XMLFilter.java,v 1.2 2004/11/03 22:55:32 jsuttor Exp $
  
  package org.xml.sax;
  
  
  import org.xml.sax.XMLReader;
  
  /**
   * Interface for an XML filter.
   *
   * <blockquote>
   * <em>This module, both source code and documentation, is in the
   * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
   * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
   * for further information.
   * </blockquote>
   *
   * <p>An XML filter is like an XML reader, except that it obtains its
   * events from another XML reader rather than a primary source like
   * an XML document or database.  Filters can modify a stream of
   * events as they pass on to the final application.</p>
   *
   * <p>The XMLFilterImpl helper class provides a convenient base
   * for creating SAX2 filters, by passing on all {@link org.xml.sax.EntityResolver
   * EntityResolver}, {@link org.xml.sax.DTDHandler DTDHandler},
   * {@link org.xml.sax.ContentHandler ContentHandler} and {@link org.xml.sax.ErrorHandler
   * ErrorHandler} events automatically.</p>
   *
   * @since SAX 2.0
   * @author David Megginson
   * @see org.xml.sax.helpers.XMLFilterImpl
   */
  public interface XMLFilter extends org.xml.sax.XMLReader
  {
  
      /**
       * Set the parent reader.
       *
       * <p>This method allows the application to link the filter to
       * a parent reader (which may be another filter).  The argument
       * may not be null.</p>
       *
       * @param parent The parent reader.
       */
      public abstract void setParent (org.xml.sax.XMLReader parent);
  
  
      /**
       * Get the parent reader.
       *
       * <p>This method allows the application to query the parent
       * reader (which may be another filter).  It is generally a
       * bad idea to perform any operations on the parent reader
       * directly: they should all pass through this filter.</p>
       *
       * @return The parent filter, or null if none has been set.
       */
      public abstract XMLReader getParent ();
  
  }
  
  // end of XMLFilter.java
  