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/* EventConsumer.java --

   Copyright (C) 1999,2000,2001 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

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permission to link this library with independent modules to produce an

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package gnu.xml.pipeline;

import org.xml.sax.*;

/**

 * Collects the event consumption apparatus of a SAX pipeline stage.

 * Consumers which permit some handlers or other characteristics to be

 * configured will provide methods to support that configuration.

 *

 * <p> Two important categories of consumers include <em>filters</em>, which

 * process events and pass them on to other consumers, and <em>terminus</em>

 * (or <em>terminal</em>) stages, which don't pass events on.  Filters are not

 * necessarily derived from the {@link EventFilter} class, although that

 * class can substantially simplify their construction by automating the

 * most common activities.

 *

 * <p> Event consumers which follow certain conventions for the signatures

 * of their constructors can be automatically assembled into pipelines

 * by the {@link PipelineFactory} class.

 *

 * @author David Brownell

 */

public interface EventConsumer

{

    /** Most stages process these core SAX callbacks. */

    public ContentHandler getContentHandler ();

    /** Few stages will use unparsed entities. */

    public DTDHandler getDTDHandler ();

    /**

     * This method works like the SAX2 XMLReader method of the same name,

     * and is used to retrieve the optional lexical and declaration handlers

     * in a pipeline.

     *

     * @param id This is a URI identifying the type of property desired.

     * @return The value of that property, if it is defined.

     *

     * @exception SAXNotRecognizedException Thrown if the particular

     *  pipeline stage does not understand the specified identifier.

     */

    public Object getProperty (String id)

    throws SAXNotRecognizedException;

    /**

     * This method provides a filter stage with a handler that abstracts

     * presentation of warnings and both recoverable and fatal errors.

     * Most pipeline stages should share a single policy and mechanism

     * for such reports, since application components require consistency

     * in such activities.  Accordingly, typical responses to this method

     * invocation involve saving the handler for use; filters will pass

     * it on to any other consumers they use.

     *

     * @param handler encapsulates error handling policy for this stage

     */

    public void setErrorHandler (ErrorHandler handler);

}