45 lines
1.8 KiB
Java
45 lines
1.8 KiB
Java
// Copyright (C) 2009 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.inject.Key;
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import com.google.inject.Module;
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import com.google.inject.assistedinject.FactoryModuleBuilder;
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import com.google.inject.util.Types;
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import java.lang.reflect.Type;
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import org.kohsuke.args4j.spi.OptionHandler;
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/** Utilities to support creating OptionHandler instances. */
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public class OptionHandlerUtil {
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/** Generate a key for an {@link OptionHandlerFactory} in Guice. */
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@SuppressWarnings("unchecked")
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public static <T> Key<OptionHandlerFactory<T>> keyFor(Class<T> valueType) {
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final Type factoryType = Types.newParameterizedType(OptionHandlerFactory.class, valueType);
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return (Key<OptionHandlerFactory<T>>) Key.get(factoryType);
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}
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@SuppressWarnings("unchecked")
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private static <T> Key<OptionHandler<T>> handlerOf(Class<T> type) {
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final Type handlerType = Types.newParameterizedTypeWithOwner(null, OptionHandler.class, type);
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return (Key<OptionHandler<T>>) Key.get(handlerType);
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}
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public static <T> Module moduleFor(Class<T> type, Class<? extends OptionHandler<T>> impl) {
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return new FactoryModuleBuilder().implement(handlerOf(type), impl).build(keyFor(type));
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}
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private OptionHandlerUtil() {}
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}
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