libjava/org/xml/sax/XMLFilter.java

   1 // XMLFilter.java - filter SAX2 events.
   2 // http://www.saxproject.org
   3 // Written by David Megginson
   4 // NO WARRANTY!  This class is in the Public Domain.
   5
   6 // $Id: XMLFilter.java,v 1.3.2.3 2002/01/29 21:34:14 dbrownell Exp $
   7
   8
   9 package org.xml.sax;
  10
  11
  12 /**
  13  * Interface for an XML filter.
  14  *
  15  * <blockquote>
  16  * <em>This module, both source code and documentation, is in the
  17  * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
  18  * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
  19  * for further information.
  20  * </blockquote>
  21  *
  22  * <p>An XML filter is like an XML reader, except that it obtains its
  23  * events from another XML reader rather than a primary source like
  24  * an XML document or database.  Filters can modify a stream of
  25  * events as they pass on to the final application.</p>
  26  *
  27  * <p>The XMLFilterImpl helper class provides a convenient base
  28  * for creating SAX2 filters, by passing on all {@link org.xml.sax.EntityResolver
  29  * EntityResolver}, {@link org.xml.sax.DTDHandler DTDHandler},
  30  * {@link org.xml.sax.ContentHandler ContentHandler} and {@link org.xml.sax.ErrorHandler
  31  * ErrorHandler} events automatically.</p>
  32  *
  33  * @since SAX 2.0
  34  * @author David Megginson
  35  * @version 2.0.1 (sax2r2)
  36  * @see org.xml.sax.helpers.XMLFilterImpl
  37  */
  38 public interface XMLFilter extends XMLReader
  39 {
  40
  41     /**
  42      * Set the parent reader.
  43      *
  44      * <p>This method allows the application to link the filter to
  45      * a parent reader (which may be another filter).  The argument
  46      * may not be null.</p>
  47      *
  48      * @param parent The parent reader.
  49      */
  50     public abstract void setParent (XMLReader parent);
  51
  52
  53     /**
  54      * Get the parent reader.
  55      *
  56      * <p>This method allows the application to query the parent
  57      * reader (which may be another filter).  It is generally a
  58      * bad idea to perform any operations on the parent reader
  59      * directly: they should all pass through this filter.</p>
  60      *
  61      * @return The parent filter, or null if none has been set.
  62      */
  63     public abstract XMLReader getParent ();
  64
  65 }
  66
  67 // end of XMLFilter.java