com.google.inject.ExposedKeyFactory Maven / Gradle / Ivy
/**
* 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;
import com.google.inject.internal.BindingImpl;
import com.google.inject.internal.Errors;
import com.google.inject.internal.ErrorsException;
import com.google.inject.internal.InternalContext;
import com.google.inject.internal.InternalFactory;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.PrivateElements;
/**
* This factory exists in a parent injector. When invoked, it retrieves its value from a child
* injector.
*/
class ExposedKeyFactory implements InternalFactory, BindingProcessor.CreationListener {
private final Key key;
private final PrivateElements privateElements;
private BindingImpl delegate;
public ExposedKeyFactory(Key key, PrivateElements privateElements) {
this.key = key;
this.privateElements = privateElements;
}
public void notify(Errors errors) {
InjectorImpl privateInjector = (InjectorImpl) privateElements.getInjector();
BindingImpl explicitBinding = privateInjector.state.getExplicitBinding(key);
// validate that the child injector has its own factory. If the getInternalFactory() returns
// this, then that child injector doesn't have a factory (and getExplicitBinding has returned
// its parent's binding instead
if (explicitBinding.getInternalFactory() == this) {
errors.withSource(explicitBinding.getSource()).exposedButNotBound(key);
return;
}
this.delegate = explicitBinding;
}
public T get(Errors errors, InternalContext context, Dependency dependency)
throws ErrorsException {
return delegate.getInternalFactory().get(errors, context, dependency);
}
}