| // Copyright (C) 2013 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.util.cli; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.gerrit.common.Nullable; |
| import com.google.inject.Binding; |
| import com.google.inject.Inject; |
| import com.google.inject.Injector; |
| import com.google.inject.Key; |
| import com.google.inject.Provider; |
| import com.google.inject.Singleton; |
| import com.google.inject.TypeLiteral; |
| |
| import java.lang.reflect.ParameterizedType; |
| import java.util.Map.Entry; |
| |
| @Singleton |
| public class OptionHandlers { |
| public static OptionHandlers empty() { |
| ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> m = |
| ImmutableMap.of(); |
| return new OptionHandlers(m); |
| } |
| |
| private final ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> map; |
| |
| @Inject |
| OptionHandlers(Injector parent) { |
| this(build(parent)); |
| } |
| |
| OptionHandlers(ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> m) { |
| this.map = m; |
| } |
| |
| @Nullable |
| OptionHandlerFactory<?> get(Class<?> type) { |
| Provider<OptionHandlerFactory<?>> b = map.get(type); |
| return b != null ? b.get() : null; |
| } |
| |
| private static ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> build(Injector i) { |
| ImmutableMap.Builder<Class<?>, Provider<OptionHandlerFactory<?>>> map = |
| ImmutableMap.builder(); |
| for (; i != null; i = i.getParent()) { |
| for (Entry<Key<?>, Binding<?>> e : i.getBindings().entrySet()) { |
| TypeLiteral<?> type = e.getKey().getTypeLiteral(); |
| if (type.getRawType() == OptionHandlerFactory.class |
| && e.getKey().getAnnotation() == null |
| && type.getType() instanceof ParameterizedType) { |
| map.put(getType(type), cast(e.getValue()).getProvider()); |
| } |
| } |
| } |
| return map.build(); |
| } |
| |
| private static Class<?> getType(TypeLiteral<?> t) { |
| ParameterizedType p = (ParameterizedType) t.getType(); |
| return (Class<?>) p.getActualTypeArguments()[0]; |
| } |
| |
| private static Binding<OptionHandlerFactory<?>> cast(Binding<?> e) { |
| @SuppressWarnings("unchecked") |
| Binding<OptionHandlerFactory<?>> b = (Binding<OptionHandlerFactory<?>>) e; |
| return b; |
| } |
| } |