1 /* gnu.java.beans.decoder.AbstractObjectContext
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 
42 /** AbstractObjectContext is the base for all Context implementations which
43  * create or provide a result object during their lifetime.
44  *
45  * <p>This class provides the implementation for an indexed get and set method.
46  * But this does not mean that the result object supports these operation.</p>
47  *
48  * @author Robert Schuster
49  *
50  */
51 abstract class AbstractObjectContext extends AbstractContext
52 {
53     protected Object object;
54 
AbstractObjectContext()55     AbstractObjectContext()
56     {}
57 
58     /** Sets the result object of the Context.
59      *
60      * @param obj The result object to be set.
61      */
setObject(Object obj)62     protected final void setObject(Object obj)
63     {
64         object = obj;
65     }
66 
67     /* (non-Javadoc)
68      * @see gnu.java.beans.decoder.Context#set(int, java.lang.Object)
69      */
set(int index, Object o)70     public final void set(int index, Object o) throws AssemblyException
71     {
72         try
73         {
74             Method method =
75                 object.getClass().getMethod(
76                     "set",
77                     new Class[] { Integer.TYPE, Object.class });
78 
79             method.invoke(object, new Object[] { new Integer(index), o });
80         }
81         catch (NoSuchMethodException nsme)
82         {
83             throw new AssemblyException(nsme);
84         }
85         catch (InvocationTargetException ite)
86         {
87             throw new AssemblyException(ite.getCause());
88         }
89         catch (IllegalAccessException iae)
90         {
91             throw new AssemblyException(iae);
92         }
93     }
94 
95     /* (non-Javadoc)
96      * @see gnu.java.beans.decoder.Context#get(int)
97      */
get(int index)98     public final Object get(int index) throws AssemblyException
99     {
100         try
101         {
102             Method method =
103                 object.getClass().getMethod(
104                     "get",
105                     new Class[] { Integer.TYPE });
106 
107             return method.invoke(object, new Object[] { new Integer(index)});
108         }
109         catch (NoSuchMethodException nsme)
110         {
111             throw new AssemblyException(nsme);
112         }
113         catch (InvocationTargetException ite)
114         {
115             throw new AssemblyException(ite.getCause());
116         }
117         catch (IllegalAccessException iae)
118         {
119             throw new AssemblyException(iae);
120         }
121     }
122 
getResult()123     public final Object getResult()
124     {
125         return object;
126     }
127 }
128