blob: 1393098821c194d877dcb08eb020e7a3450b78ab (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*******************************************************************************
* Copyright (c) 2013 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.factory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.eclipse.jpt.common.utility.factory.Factory;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
/**
* A factory that uses Java reflection to return the value of a static field.
* Checked exceptions are converted to {@link RuntimeException}s.
*
* @param <T> the type of objects returned by the factory
*
* @see StaticMethodFactory
* @see java.lang.reflect.Field#get(Object)
*/
public class StaticMethodFactory<T>
implements Factory<T>
{
private final Method method;
private final Object[] arguments;
public StaticMethodFactory(Method method, Object[] arguments) {
super();
if ((method == null) || (arguments == null)) {
throw new NullPointerException();
}
if ( ! Modifier.isStatic(method.getModifiers())) {
throw new IllegalArgumentException("method must be static: " + method); //$NON-NLS-1$
}
if ( ! method.isAccessible()) {
throw new IllegalArgumentException("method must be accessible: " + method); //$NON-NLS-1$
}
this.method = method;
this.arguments = arguments;
}
@SuppressWarnings("unchecked")
public T create() {
try {
return (T) this.method.invoke(null, this.arguments);
} catch (IllegalArgumentException ex) {
throw new RuntimeException(ex);
} catch (IllegalAccessException ex) {
throw new RuntimeException(ex);
} catch (InvocationTargetException ex) {
throw new RuntimeException(ex);
}
}
@Override
public String toString() {
return ObjectTools.toString(this, this.method);
}
}
|
