com.google.gerrit.extensions.registration.DynamicSetProvider Maven / Gradle / Ivy

// 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 java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

class DynamicSetProvider implements Provider> {
  private final TypeLiteral type;

  @Inject private Injector injector;

  DynamicSetProvider(TypeLiteral type) {
    this.type = type;
  }

  @Override
  public DynamicSet get() {
    return new DynamicSet<>(find(injector, type));
  }

  private static  List>> find(Injector src, TypeLiteral type) {
    List> bindings = src.findBindingsByType(type);
    int cnt = bindings != null ? bindings.size() : 0;
    if (cnt == 0) {
      return Collections.emptyList();
    }
    List>> r = new ArrayList<>(cnt);
    for (Binding b : bindings) {
      if (b.getKey().getAnnotation() != null) {
        r.add(new AtomicReference<>(b.getProvider()));
      }
    }
    return r;
  }
}