Line data    Source code

       1             : // Copyright (C) 2012 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.extensions.registration;
      16             : 
      17             : import com.google.common.collect.ImmutableList;
      18             : import com.google.inject.Binding;
      19             : import com.google.inject.Inject;
      20             : import com.google.inject.Injector;
      21             : import com.google.inject.Provider;
      22             : import com.google.inject.TypeLiteral;
      23             : import java.util.ArrayList;
      24             : import java.util.List;
      25             : import java.util.concurrent.atomic.AtomicReference;
      26             : 
      27             : class DynamicSetProvider<T> implements Provider<DynamicSet<T>> {
      28             :   private final TypeLiteral<T> type;
      29             : 
      30             :   @Inject private Injector injector;
      31             : 
      32         153 :   DynamicSetProvider(TypeLiteral<T> type) {
      33         153 :     this.type = type;
      34         153 :   }
      35             : 
      36             :   @Override
      37             :   public DynamicSet<T> get() {
      38         152 :     return new DynamicSet<>(find(injector, type));
      39             :   }
      40             : 
      41             :   private static <T> ImmutableList<AtomicReference<Extension<T>>> find(
      42             :       Injector src, TypeLiteral<T> type) {
      43         152 :     List<Binding<T>> bindings = src.findBindingsByType(type);
      44         152 :     int cnt = bindings != null ? bindings.size() : 0;
      45         152 :     if (cnt == 0) {
      46         152 :       return ImmutableList.of();
      47             :     }
      48         152 :     List<AtomicReference<Extension<T>>> r = new ArrayList<>(cnt);
      49         152 :     for (Binding<T> b : bindings) {
      50         152 :       if (b.getKey().getAnnotation() != null) {
      51         152 :         r.add(new AtomicReference<>(new Extension<>(PluginName.GERRIT, b.getProvider())));
      52             :       }
      53         152 :     }
      54         152 :     return ImmutableList.copyOf(r);
      55             :   }
      56             : }