| // Copyright (C) 2012 The Android Open Source Project |
| // |
| // 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.gerrit.extensions.registration; |
| |
| import com.google.inject.Binding; |
| import com.google.inject.Inject; |
| import com.google.inject.Injector; |
| import com.google.inject.Provider; |
| import com.google.inject.TypeLiteral; |
| import com.google.inject.internal.UniqueAnnotations; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| class DynamicSetProvider<T> implements Provider<DynamicSet<T>> { |
| private static final Class<?> UNIQUE_ANNOTATION = |
| UniqueAnnotations.create().getClass(); |
| private final TypeLiteral<T> type; |
| |
| @Inject |
| private Injector injector; |
| |
| DynamicSetProvider(TypeLiteral<T> type) { |
| this.type = type; |
| } |
| |
| public DynamicSet<T> get() { |
| return new DynamicSet<T>(find(injector, type)); |
| } |
| |
| private static <T> List<AtomicReference<Provider<T>>> find( |
| Injector src, |
| TypeLiteral<T> type) { |
| List<Binding<T>> bindings = src.findBindingsByType(type); |
| int cnt = bindings != null ? bindings.size() : 0; |
| if (cnt == 0) { |
| return Collections.emptyList(); |
| } |
| List<AtomicReference<Provider<T>>> r = newList(cnt); |
| for (Binding<T> b : bindings) { |
| if (b.getKey().getAnnotation() != null) { |
| r.add(new AtomicReference<Provider<T>>(b.getProvider())); |
| } |
| } |
| return r; |
| } |
| |
| private static <T> List<AtomicReference<Provider<T>>> newList(int cnt) { |
| return new ArrayList<AtomicReference<Provider<T>>>(cnt); |
| } |
| } |