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/**
* Copyright (C) 2011 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.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.MapMaker;
import com.google.inject.Key;
import com.google.inject.spi.ProvisionListener;
import com.google.inject.spi.ProvisionListenerBinding;
import java.util.List;
import java.util.Map;
/**
* {@link ProvisionListenerStackCallback} for each key.
*
* @author sameb@google.com (Sam Berlin)
*/
final class ProvisionListenerCallbackStore {
private final ImmutableList<ProvisionListenerBinding> listenerBindings;
private final Map<Key<?>, ProvisionListenerStackCallback<?>> cache
= new MapMaker().makeComputingMap(
new Function<Key<?>, ProvisionListenerStackCallback<?>>() {
public ProvisionListenerStackCallback<?> apply(Key<?> key) {
return create(key);
}
});
ProvisionListenerCallbackStore(List<ProvisionListenerBinding> listenerBindings) {
this.listenerBindings = ImmutableList.copyOf(listenerBindings);
}
/** Returns a new {@link ProvisionListenerStackCallback} for the key.
*/
@SuppressWarnings("unchecked") // the ProvisionListenerStackCallback type always agrees with the passed type
public <T> ProvisionListenerStackCallback<T> get(Key<T> key) {
return (ProvisionListenerStackCallback<T>) cache.get(key);
}
/**
* Purges a key from the cache. Use this only if the type is not actually valid for
* binding and needs to be purged. (See issue 319 and
* ImplicitBindingTest#testCircularJitBindingsLeaveNoResidue and
* #testInstancesRequestingProvidersForThemselvesWithChildInjectors for examples of when this is
* necessary.)
*
* Returns true if the type was stored in the cache, false otherwise.
*/
boolean remove(Key<?> type) {
return cache.remove(type) != null;
}
/**
* Creates a new {@link ProvisionListenerStackCallback} with the correct listeners
* for the key.
*/
private <T> ProvisionListenerStackCallback<T> create(Key<T> key) {
List<ProvisionListener> listeners = null;
for (ProvisionListenerBinding binding : listenerBindings) {
if (binding.getKeyMatcher().matches(key)) {
if (listeners == null) {
listeners = Lists.newArrayList();
}
listeners.addAll(binding.getListeners());
}
}
if (listeners == null) {
listeners = ImmutableList.of();
}
return new ProvisionListenerStackCallback<T>(key, listeners);
}
}
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