Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/beans/decoder/IndexContext.java

@@ -0,0 +1,130 @@
+/* gnu.java.beans.decoder.IndexContext
+   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;
+
+/** IndexContext is Context implementation that senses whether it is an indexed get or set
+ * operation and invokes this operation.
+ *
+ * <p>An IndexContent is a get operation when no argument is provided and a set operation if one
+ * argument is provided.</p>
+ *
+ * @author Robert Schuster
+ */
+class IndexContext extends AbstractContext
+{
+  private Object result;
+  private Object argument;
+  private int index;
+  private boolean isSetter;
+
+  IndexContext(String id, int newIndex)
+  {
+    setId(id);
+    index = newIndex;
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)
+   */
+  public void addParameterObject(Object o) throws AssemblyException
+  {
+    if (! isSetter)
+      {
+	argument = o;
+	isSetter = true;
+      }
+    else
+      throw new AssemblyException(new IllegalStateException("More than one argument for indiced access is not possible."));
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#reportStatement()
+   */
+  public void notifyStatement(Context outerContext) throws AssemblyException
+  {
+    throw new AssemblyException(new IllegalStateException("Statements inside indiced access are not allowed."));
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#endContext(gnu.java.beans.decoder.Context)
+   */
+  public Object endContext(Context outerContext) throws AssemblyException
+  {
+    if (isSetter)
+      {
+	// setter
+	outerContext.set(index, argument);
+
+	return null;
+      }
+    else
+      // getter
+      return result = outerContext.get(index);
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#subContextFailed()
+   */
+  public boolean subContextFailed()
+  {
+    // returns true to indicate that indiced access assembly fails when one of its
+    // argument could not be assembled
+    return true;
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#set(int, java.lang.Object)
+   */
+  public void set(int index, Object o) throws AssemblyException
+  {
+    throw new AssemblyException(new IllegalStateException("Setter is not allowed inside indiced access."));
+  }
+
+  /* (non-Javadoc)
+   * @see gnu.java.beans.decoder.Context#get(int)
+   */
+  public Object get(int index) throws AssemblyException
+  {
+    throw new AssemblyException(new IllegalStateException("getter is not allowed insided indiced access."));
+  }
+
+  public Object getResult()
+  {
+    return result;
+  }
+}