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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
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+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);
+}