1 |
14 |
jlechner |
/* gnu.java.beans.decoder.MethodFinder
|
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 |
|
|
|
38 |
|
|
package gnu.java.beans.decoder;
|
39 |
|
|
|
40 |
|
|
import java.lang.reflect.Constructor;
|
41 |
|
|
import java.lang.reflect.Method;
|
42 |
|
|
import java.util.HashMap;
|
43 |
|
|
|
44 |
|
|
class MethodFinder
|
45 |
|
|
{
|
46 |
|
|
/** Provides a mapping between a wrapper class and its corresponding primitive's type. */
|
47 |
|
|
private static HashMap typeMapping = new HashMap();
|
48 |
|
|
|
49 |
|
|
static {
|
50 |
|
|
typeMapping.put(Byte.class, Byte.TYPE);
|
51 |
|
|
typeMapping.put(Short.class, Short.TYPE);
|
52 |
|
|
typeMapping.put(Integer.class, Integer.TYPE);
|
53 |
|
|
typeMapping.put(Long.class, Long.TYPE);
|
54 |
|
|
typeMapping.put(Float.class, Float.TYPE);
|
55 |
|
|
typeMapping.put(Double.class, Double.TYPE);
|
56 |
|
|
|
57 |
|
|
typeMapping.put(Character.class, Character.TYPE);
|
58 |
|
|
typeMapping.put(Boolean.class, Boolean.TYPE);
|
59 |
|
|
}
|
60 |
|
|
|
61 |
|
|
private MethodFinder()
|
62 |
|
|
{
|
63 |
|
|
}
|
64 |
|
|
|
65 |
|
|
/** Searches a Method which can accept the given arguments.
|
66 |
|
|
*
|
67 |
|
|
* @param klass
|
68 |
|
|
* @param name
|
69 |
|
|
* @param arguments
|
70 |
|
|
* @return
|
71 |
|
|
* @throws NoSuchMethodException
|
72 |
|
|
*/
|
73 |
|
|
static Method getMethod(Class klass, String name, Object[] arguments)
|
74 |
|
|
throws NoSuchMethodException
|
75 |
|
|
{
|
76 |
|
|
// prepares array containing the types of the arguments
|
77 |
|
|
Class[] argumentTypes = getArgumentTypes(arguments);
|
78 |
|
|
|
79 |
|
|
Method[] methods = klass.getMethods();
|
80 |
|
|
|
81 |
|
|
// iterates over all public methods
|
82 |
|
|
for (int i = 0; i < methods.length; i++)
|
83 |
|
|
{
|
84 |
|
|
if (methods[i].getName().equals(name))
|
85 |
|
|
{
|
86 |
|
|
if (matchingArgumentTypes(methods[i].getParameterTypes(),
|
87 |
|
|
argumentTypes))
|
88 |
|
|
return methods[i];
|
89 |
|
|
}
|
90 |
|
|
}
|
91 |
|
|
|
92 |
|
|
throw new NoSuchMethodException(
|
93 |
|
|
"Could not find a matching method named "
|
94 |
|
|
+ name
|
95 |
|
|
+ "() in class "
|
96 |
|
|
+ klass);
|
97 |
|
|
}
|
98 |
|
|
|
99 |
|
|
static Constructor getConstructor(Class klass, Object[] arguments)
|
100 |
|
|
throws NoSuchMethodException
|
101 |
|
|
{
|
102 |
|
|
Class[] argumentTypes = getArgumentTypes(arguments);
|
103 |
|
|
Constructor[] constructors = klass.getConstructors();
|
104 |
|
|
|
105 |
|
|
// iterates over all public methods
|
106 |
|
|
for (int i = 0; i < constructors.length; i++)
|
107 |
|
|
{
|
108 |
|
|
if (matchingArgumentTypes(constructors[i].getParameterTypes(),
|
109 |
|
|
argumentTypes))
|
110 |
|
|
return constructors[i];
|
111 |
|
|
}
|
112 |
|
|
|
113 |
|
|
throw new NoSuchMethodException(
|
114 |
|
|
"Could not find a matching constructor in class " + klass);
|
115 |
|
|
}
|
116 |
|
|
|
117 |
|
|
/** Transforms an array of argument objects into an array of argument types.
|
118 |
|
|
* For each argument being null the argument is null, too. An argument type
|
119 |
|
|
* being null means: Accepts everything (although this can be ambigous).
|
120 |
|
|
*
|
121 |
|
|
* @param arguments
|
122 |
|
|
* @return
|
123 |
|
|
*/
|
124 |
|
|
private static Class[] getArgumentTypes(Object[] arguments)
|
125 |
|
|
{
|
126 |
|
|
if (arguments == null)
|
127 |
|
|
return new Class[0];
|
128 |
|
|
|
129 |
|
|
// prepares array containing the types of the arguments
|
130 |
|
|
Class[] argumentTypes = new Class[arguments.length];
|
131 |
|
|
for (int i = 0; i < arguments.length; i++)
|
132 |
|
|
argumentTypes[i] =
|
133 |
|
|
(arguments[i] == null) ? null : arguments[i].getClass();
|
134 |
|
|
return argumentTypes;
|
135 |
|
|
}
|
136 |
|
|
|
137 |
|
|
/** Tests whether the argument types supplied to the method argument types
|
138 |
|
|
* are assignable. In addition to the assignment specifications this method
|
139 |
|
|
* handles the primitive's wrapper classes as if they were of their
|
140 |
|
|
* primitive type (e.g Boolean.class equals Boolean.TYPE).
|
141 |
|
|
* When a supplied argument type is null it is assumed that no argument
|
142 |
|
|
* object was supplied for it and the test for this particular parameter will
|
143 |
|
|
* pass.
|
144 |
|
|
*
|
145 |
|
|
* @param methodArgTypes
|
146 |
|
|
* @param suppliedArgTypes
|
147 |
|
|
* @return
|
148 |
|
|
*/
|
149 |
|
|
private static boolean matchingArgumentTypes(
|
150 |
|
|
Class[] methodArgTypes,
|
151 |
|
|
Class[] suppliedArgTypes)
|
152 |
|
|
{
|
153 |
|
|
if (methodArgTypes.length != suppliedArgTypes.length)
|
154 |
|
|
return false;
|
155 |
|
|
|
156 |
|
|
for (int i = 0; i < methodArgTypes.length; i++)
|
157 |
|
|
{
|
158 |
|
|
if (suppliedArgTypes[i] == null)
|
159 |
|
|
{
|
160 |
|
|
// by definition a non-existant argument type (null) can be converted to everything
|
161 |
|
|
continue;
|
162 |
|
|
}
|
163 |
|
|
else if (typeMapping.containsKey(suppliedArgTypes[i]))
|
164 |
|
|
{
|
165 |
|
|
Class primitiveType =
|
166 |
|
|
(Class) typeMapping.get(suppliedArgTypes[i]);
|
167 |
|
|
if (!(methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i])
|
168 |
|
|
|| methodArgTypes[i].isAssignableFrom(primitiveType)))
|
169 |
|
|
return false;
|
170 |
|
|
}
|
171 |
|
|
else if (!methodArgTypes[i].isAssignableFrom(suppliedArgTypes[i]))
|
172 |
|
|
return false;
|
173 |
|
|
}
|
174 |
|
|
|
175 |
|
|
return true;
|
176 |
|
|
}
|
177 |
|
|
}
|