blob: b57f92e79582b521e40c8a46b6502db690e45e56 (
plain)
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
67
68
69
|
/*
* Copyright (C) 2006 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.elasticsearch.common.inject;
import org.elasticsearch.common.inject.spi.InjectionPoint;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
/**
* Produces construction proxies that invoke the class constructor.
*
* @author crazybob@google.com (Bob Lee)
*/
class DefaultConstructionProxyFactory<T> implements ConstructionProxyFactory<T> {
private final InjectionPoint injectionPoint;
/**
* @param injectionPoint an injection point whose member is a constructor of {@code T}.
*/
DefaultConstructionProxyFactory(InjectionPoint injectionPoint) {
this.injectionPoint = injectionPoint;
}
@Override
public ConstructionProxy<T> create() {
@SuppressWarnings("unchecked") // the injection point is for a constructor of T
final Constructor<T> constructor = (Constructor<T>) injectionPoint.getMember();
return new ConstructionProxy<T>() {
@Override
public T newInstance(Object... arguments) throws InvocationTargetException {
try {
return constructor.newInstance(arguments);
} catch (InstantiationException e) {
throw new AssertionError(e); // shouldn't happen, we know this is a concrete type
} catch (IllegalAccessException e) {
throw new AssertionError("Wrong access modifiers on " + constructor, e); // a security manager is blocking us, we're hosed
}
}
@Override
public InjectionPoint getInjectionPoint() {
return injectionPoint;
}
@Override
public Constructor<T> getConstructor() {
return constructor;
}
};
}
}
|
