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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;
- }
-}
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