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package org.xml.sax;


Interface for an XML filter.
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.
The XMLFilterImpl helper class provides a convenient base for creating SAX2 filters, by passing on all 
EntityResolver, DTDHandler, ContentHandler and 
ErrorHandler events automatically.
Author:
David Megginson
See Also:
XMLFilterImpl
Since:
1.4, SAX 2.0/**
 * Interface for an XML filter.
 *
 * <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 1.4, SAX 2.0
 * @author David Megginson
 * @see org.xml.sax.helpers.XMLFilterImpl
 */
public interface XMLFilter extends XMLReader
{

    
Set the parent reader.
This method allows the application to link the filter to
a parent reader (which may be another filter).  The argument
may not be null.
Params:
parent – The parent reader./**
     * 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 (XMLReader parent);


    
Get the parent reader.
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.
Returns:
The parent filter, or null if none has been set./**
     * 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