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+/* gnu.java.beans.decoder.ElementHandler
+   Copyright (C) 2004 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.java.beans.decoder;
+
+import java.beans.ExceptionListener;
+
+import org.xml.sax.Attributes;
+
+/** ElementHandler manages a Context instance and interacts with
+ * its parent and child handlers.
+ *
+ * @author Robert Schuster
+ */
+interface ElementHandler
+{
+  /** Evaluates the attributes and creates a Context instance.
+   * If the creation of the Context instance fails the ElementHandler
+   * is marked as failed which may affect the parent handler other.
+   *
+   * @param attributes Attributes of the XML tag.
+   */
+  void start(Attributes attributes, ExceptionListener exceptionListener);
+
+  /** Post-processes the Context.
+   */
+  void end(ExceptionListener exceptionListener);
+
+  /** Adds characters from the body of the XML tag to the buffer.
+   *
+   * @param ch
+   * @param start
+   * @param length
+   * @throws SAXException
+   */
+  void characters(char[] ch, int start, int length);
+
+  /** Returns whether a subelement of the given name is allowed. The rules
+   * for evaluating this are derived from the javabeans.dtd which can be found
+   * here: <a href="http://java.sun.com/products/jfc/tsc/articles/persistence3">Java Persistence Article</a>.
+   *
+   * @param subElementName
+   * @return
+   */
+  boolean isSubelementAllowed(String subElementName);
+
+  /** Provides the same functionality as Class.forName() but allows the decoder
+   * to use a different class loader.
+   *
+   * @param className
+   * @return
+   * @throws ClassNotFoundException
+   */
+  Class instantiateClass(String className) throws ClassNotFoundException;
+
+  /** Notifies the handler's Context that its child Context will not return
+   * a value back. Some Context variants need this information to know when
+   * a method or a constructor call can be made.
+   *
+   * This method is called by a child handler.
+   */
+  void notifyStatement(ExceptionListener exceptionListener);
+
+  /** Returns whether this handler has failed.
+   *
+   * This is used to skip child elements.
+   *
+   * @return Whether this handler has failed.
+   */
+  boolean hasFailed();
+
+  /** Returns the Context instance this handler is working on.
+   *
+   * @return The handler's Context instance.
+   */
+  Context getContext();
+
+  /** Notifies the handler that its Context failed and starts a recursive
+   * invocation of the parent handler if it is affected by that failure.
+   *
+   * Although the method is a public API member it is only used internally.
+   */
+  void notifyContextFailed();
+
+  /** Stores the object under the given id. The object is not stored if the
+   * id is null.
+   *
+   * @param objectId
+   * @param o
+   */
+  void putObject(String objectId, Object o);
+
+  Object getObject(String objectId) throws AssemblyException;
+
+  ElementHandler getParent();
+}