| /* 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; |
| } |
| } |