/**
* 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.Key;
import com.google.inject.internal.InjectorImpl.JitLimitation;
import com.google.inject.internal.util.ToStringBuilder;
import com.google.inject.spi.Dependency;
/**
* A placeholder which enables us to swap in the real factory once the injector is created.
* Used for a linked binding, so that getting the linked binding returns the link's factory.
*/
final class FactoryProxy<T> implements InternalFactory<T>, BindingProcessor.CreationListener {
private final InjectorImpl injector;
private final Key<T> key;
private final Key<? extends T> targetKey;
private final Object source;
private InternalFactory<? extends T> targetFactory;
FactoryProxy(InjectorImpl injector, Key<T> key, Key<? extends T> targetKey, Object source) {
this.injector = injector;
this.key = key;
this.targetKey = targetKey;
this.source = source;
}
public void notify(final Errors errors) {
try {
targetFactory = injector.getInternalFactory(targetKey, errors.withSource(source), JitLimitation.NEW_OR_EXISTING_JIT);
} catch (ErrorsException e) {
errors.merge(e.getErrors());
}
}
public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
throws ErrorsException {
return targetFactory.get(errors.withSource(targetKey), context, dependency, true);
}
@Override public String toString() {
return new ToStringBuilder(FactoryProxy.class)
.add("key", key)
.add("provider", targetFactory)
.toString();
}
}