/**
* Copyright (C) 2008 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 com.google.inject.internal;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.InjectionPoint;
import java.lang.reflect.Field;
/**
* Sets an injectable field.
*/
final class SingleFieldInjector implements SingleMemberInjector {
final Field field;
final InjectionPoint injectionPoint;
final Dependency<?> dependency;
final InternalFactory<?> factory;
public SingleFieldInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)
throws ErrorsException {
this.injectionPoint = injectionPoint;
this.field = (Field) injectionPoint.getMember();
this.dependency = injectionPoint.getDependencies().get(0);
// Ewwwww...
field.setAccessible(true);
factory = injector.getInternalFactory(dependency.getKey(), errors);
}
public InjectionPoint getInjectionPoint() {
return injectionPoint;
}
public void inject(Errors errors, InternalContext context, Object o) {
errors = errors.withSource(dependency);
Dependency previous = context.setDependency(dependency);
try {
Object value = factory.get(errors, context, dependency);
field.set(o, value);
} catch (ErrorsException e) {
errors.withSource(injectionPoint).merge(e.getErrors());
} catch (IllegalAccessException e) {
throw new AssertionError(e); // a security manager is blocking us, we're hosed
} finally {
context.setDependency(previous);
}
}
}