1 /*
2  * Copyright (C) 2008 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.inject.internal;
18 
19 import com.google.inject.internal.InjectorImpl.JitLimitation;
20 import com.google.inject.spi.Dependency;
21 import com.google.inject.spi.InjectionPoint;
22 import java.lang.reflect.Field;
23 
24 /** Sets an injectable field. */
25 final class SingleFieldInjector implements SingleMemberInjector {
26   final Field field;
27   final InjectionPoint injectionPoint;
28   final Dependency<?> dependency;
29   final BindingImpl<?> binding;
30 
SingleFieldInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)31   public SingleFieldInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)
32       throws ErrorsException {
33     this.injectionPoint = injectionPoint;
34     this.field = (Field) injectionPoint.getMember();
35     this.dependency = injectionPoint.getDependencies().get(0);
36 
37     // Ewwwww...
38     field.setAccessible(true);
39     binding = injector.getBindingOrThrow(dependency.getKey(), errors, JitLimitation.NO_JIT);
40   }
41 
42   @Override
getInjectionPoint()43   public InjectionPoint getInjectionPoint() {
44     return injectionPoint;
45   }
46 
47   @Override
inject(InternalContext context, Object o)48   public void inject(InternalContext context, Object o) throws InternalProvisionException {
49     Dependency previous = context.pushDependency(dependency, binding.getSource());
50 
51     try {
52       Object value = binding.getInternalFactory().get(context, dependency, false);
53       field.set(o, value);
54     } catch (InternalProvisionException e) {
55       throw e.addSource(dependency);
56     } catch (IllegalAccessException e) {
57       throw new AssertionError(e); // a security manager is blocking us, we're hosed
58     } finally {
59         context.popStateAndSetDependency(previous);
60       }
61   }
62 }
63