Source code: gnu/java/beans/decoder/MethodContext.java
1 /* gnu.java.beans.decoder.MethodContext
2 Copyright (C) 2004 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37 package gnu.java.beans.decoder;
38
39 import java.lang.reflect.InvocationTargetException;
40 import java.lang.reflect.Method;
41 import java.util.ArrayList;
42
43 /** MethodContext collects arguments for a method call and creates the result object
44 * using it. The method is called using the result object of the parent Context.
45 *
46 * <p>When the result object is available methods can be called on it using sub-Contexts.</p>
47 *
48 * @author Robert Schuster
49 */
50 class MethodContext extends AbstractCreatableObjectContext
51 {
52 private ArrayList arguments = new ArrayList();
53 private String methodName;
54
55 MethodContext(String id, String newMethodName)
56 {
57 setId(id);
58 setStatement(true);
59 methodName = newMethodName;
60 }
61
62 /* (non-Javadoc)
63 * @see gnu.java.beans.decoder.Context#addObject(java.lang.Object)
64 */
65 public void addParameterObjectImpl(Object o)
66 {
67 arguments.add(o);
68 }
69
70 /* (non-Javadoc)
71 * @see gnu.java.beans.decoder.Context#endContext(gnu.java.beans.decoder.Context)
72 */
73 protected Object createObject(Context outerContext)
74 throws AssemblyException
75 {
76 Object outerObject = outerContext.getResult();
77
78 if (outerObject == null)
79 throw new AssemblyException(
80 new NullPointerException(
81 "No object to invoke method " + methodName));
82
83 Object[] args = arguments.toArray();
84
85 try
86 {
87 Method method =
88 MethodFinder.getMethod(
89 outerObject.getClass(),
90 methodName,
91 args);
92 return method.invoke(outerObject, args);
93 }
94 catch (NoSuchMethodException nsme)
95 {
96 throw new AssemblyException(nsme);
97 }
98 catch (InvocationTargetException ite)
99 {
100 throw new AssemblyException(ite.getCause());
101 }
102 catch (IllegalAccessException iae)
103 {
104 throw new AssemblyException(iae);
105 }
106 }
107 }