com.google.copybara.Options.java Source code

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Here is the source code for com.google.copybara.Options.java

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/*
 * Copyright (C) 2016 Google Inc.
 *
 * 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.copybara;

import com.google.common.collect.ImmutableMap;

/**
 * A class that groups all the options used in the program
 */
public class Options {

    private final ImmutableMap<Class<? extends Option>, Option> config;

    public Options(Iterable<? extends Option> options) {
        ImmutableMap.Builder<Class<? extends Option>, Option> builder = ImmutableMap.builder();
        for (Option option : options) {
            builder.put(option.getClass(), option);
        }
        config = builder.build();
    }

    /**
     * Get an option for a given class.
     *
     * @throws IllegalStateException if the configuration cannot be found
     */
    @SuppressWarnings("unchecked")
    public <T extends Option> T get(Class<? extends T> optionClass) {
        Option config = this.config.get(optionClass);
        if (config == null) {
            throw new IllegalStateException("No option type found for " + optionClass);
        }
        return (T) config;
    }
}