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+/* gnu.java.beans.decoder.PropertyContext
+ 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.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/** PropertyContext is a Context implementation that is very similar to MethodContext
+ * and IndexContext. The sole purpose of PropertyContext to find out whether it should
+ * 'set' or 'get' a certain property. This decision is made using the number of
+ * arguments.
+ * <p>When the method call has to be made and there is no argument we 'get' the property.
+ * With one argument it is 'set'.</p>
+ *
+ * @author Robert Schuster
+ */
+class PropertyContext extends AbstractObjectContext
+{
+ private Object argument;
+ private String propertyName;
+ private String prefix = "get";
+ private boolean methodCalled;
+
+ PropertyContext(String id, String newPropertyName)
+ {
+ setId(id);
+ propertyName = newPropertyName;
+ }
+
+ /* (non-Javadoc)
+ * @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)
+ */
+ public void addParameterObject(Object o) throws AssemblyException
+ {
+ if (methodCalled)
+ throw new AssemblyException(new IllegalArgumentException("Cannot add parameter object when method was already called."));
+
+ if (argument != null)
+ throw new AssemblyException(new IllegalArgumentException("Property attribut allows zero or one argument only."));
+
+ argument = o;
+ setStatement(true);
+ prefix = "set";
+ }
+
+ /* (non-Javadoc)
+ * @see gnu.java.beans.decoder.Context#endContext(gnu.java.beans.decoder.Context)
+ */
+ public void notifyStatement(Context outerContext) throws AssemblyException
+ {
+ if (methodCalled)
+ return;
+ methodCalled = true;
+
+ Object outerObject = outerContext.getResult();
+
+ if (outerObject == null)
+ throw new AssemblyException(new NullPointerException("No object to access property "
+ + propertyName));
+
+
+ // converts property name into a method name
+ String methodName = prefix + propertyName.substring(0, 1).toUpperCase()
+ + propertyName.substring(1);
+
+ // prepares the argument
+ Object[] args = (argument != null) ? new Object[] { argument } : null;
+
+ try
+ {
+ Method method = MethodFinder.getMethod(outerObject.getClass(),
+ methodName, args);
+
+ // stores the result whether it is available or not
+ setObject(method.invoke(outerObject, args));
+ }
+ catch (NoSuchMethodException nsme)
+ {
+ throw new AssemblyException(nsme);
+ }
+ catch (InvocationTargetException ite)
+ {
+ throw new AssemblyException(ite.getCause());
+ }
+ catch (IllegalAccessException iae)
+ {
+ throw new AssemblyException(iae);
+ }
+ }
+
+ public Object endContext(Context outerContext) throws AssemblyException
+ {
+ notifyStatement(outerContext);
+
+ return getResult();
+ }
+
+ public boolean subContextFailed()
+ {
+ return ! methodCalled;
+ }
+}