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+/* gnu.java.beans.decoder.Context
+ 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;
+
+/** A Context is the environment for an object which is being assembler. If there
+ * are no errors each handler creates one Context.
+ * <p>Depending on the result of isStatement() a Context can be statement or an
+ * expression. An expression returns a value to the Context of its parent handler,
+ * a statement does not. Whenever a Context is a statement the parent handler's
+ * Context is informed about that through the {@link notifyStatement}-method.</p>
+ *
+ * @author Robert Schuster
+ */
+interface Context
+{
+ /** Adds a parameter object to the context. This method is used when
+ * sub-Contexts return their result.
+ *
+ * Some Contexts do not accept more than a certain amount of objects
+ * and throw an AssemblerException if the amount is exceeded.
+ *
+ * @param o The object added to this context.
+ */
+ void addParameterObject(Object o) throws AssemblyException;
+
+ /** Notifies that the next element is a statement. This can mean
+ * that an argument list is complete to be called.
+ *
+ */
+ void notifyStatement(Context outerContext) throws AssemblyException;
+
+ /** Notifies that the context ends and the returns the appropriate result
+ * object.
+ *
+ * @param outerContext
+ * @return
+ */
+ Object endContext(Context outerContext) throws AssemblyException;
+
+ /** Notifies that the assembly of a subcontext failed and returns
+ * whether this Context is affected in a way that it fails too.
+ *
+ * @return Whether the failure of a subcontext lets this context fail, too.
+ */
+ boolean subContextFailed();
+
+ /** Calls an appropriate indexed set method if it is available or
+ * throws an AssemblerException if that is not allowed on this Context.
+ *
+ * The behaviour of this method is equal to List.set(int, Object).
+ *
+ * @param index Index position to be set.
+ * @param o Object to be set at the given index position.
+ * @throws AssemblerException Indexed set is not allowed or otherwise failed.
+ */
+ void set(int index, Object o) throws AssemblyException;
+
+ /** Calls an appropriate indexed get method if it is available or
+ * throws an AssemblerException if that is not allowed on this Context.
+ *
+ * The behaviour of this method is equal to List.get(int).
+ *
+ * @param index Index position of the object return.
+ * @throws AssemblerException Indexed get is not allowed or otherwise failed.
+ */
+ Object get(int index) throws AssemblyException;
+
+ /** Returns the result which was calculated by calling endContext() or reportStatement().
+ * Its the handler's responsibility to care that any of these two methods was called.
+ *
+ * This is used by sub-Contexts to access this Context's result.
+ *
+ * @return
+ */
+ Object getResult();
+
+ /** Gives this Context a unique id. For convenience the id may be null which means
+ * that no id exists at all.
+ *
+ * @param id
+ */
+ void setId(String id);
+
+ /** Returns this Context's unique id or null if does not have such an id.
+ *
+ * @return This Context's id or null.
+ */
+ String getId();
+
+ /** Returns whether this Context is a statement (not returning result back
+ * to parent handler's Context) or not (= expression).
+ *
+ * @return
+ */
+ boolean isStatement();
+
+ /** Sets whether this Context is a statement or not.
+ *
+ * @param b
+ */
+ void setStatement(boolean b);
+}