78 lines
2.6 KiB
Java
78 lines
2.6 KiB
Java
// Copyright (C) 2013 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.util.cli;
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import com.google.common.collect.ImmutableMap;
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import com.google.gerrit.common.Nullable;
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import com.google.inject.Binding;
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import com.google.inject.Inject;
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import com.google.inject.Injector;
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import com.google.inject.Key;
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import com.google.inject.Provider;
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import com.google.inject.Singleton;
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import com.google.inject.TypeLiteral;
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import java.lang.reflect.ParameterizedType;
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import java.util.Map.Entry;
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@Singleton
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public class OptionHandlers {
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public static OptionHandlers empty() {
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ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> m = ImmutableMap.of();
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return new OptionHandlers(m);
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}
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private final ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> map;
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@Inject
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OptionHandlers(Injector parent) {
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this(build(parent));
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}
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OptionHandlers(ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> m) {
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this.map = m;
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}
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@Nullable
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OptionHandlerFactory<?> get(Class<?> type) {
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Provider<OptionHandlerFactory<?>> b = map.get(type);
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return b != null ? b.get() : null;
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}
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private static ImmutableMap<Class<?>, Provider<OptionHandlerFactory<?>>> build(Injector i) {
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ImmutableMap.Builder<Class<?>, Provider<OptionHandlerFactory<?>>> map = ImmutableMap.builder();
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for (; i != null; i = i.getParent()) {
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for (Entry<Key<?>, Binding<?>> e : i.getBindings().entrySet()) {
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TypeLiteral<?> type = e.getKey().getTypeLiteral();
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if (type.getRawType() == OptionHandlerFactory.class
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&& e.getKey().getAnnotation() == null
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&& type.getType() instanceof ParameterizedType) {
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map.put(getType(type), cast(e.getValue()).getProvider());
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}
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}
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}
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return map.build();
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}
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private static Class<?> getType(TypeLiteral<?> t) {
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ParameterizedType p = (ParameterizedType) t.getType();
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return (Class<?>) p.getActualTypeArguments()[0];
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}
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@SuppressWarnings("unchecked")
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private static Binding<OptionHandlerFactory<?>> cast(Binding<?> e) {
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return (Binding<OptionHandlerFactory<?>>) e;
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}
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}
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