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/*
 * Copyright (C) 2007 the original author or authors.
 *
 * 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 org.codehaus.plexus.component.annotations;

import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

/**
 * Configures a requirement.
 *
 * @since 1.0-alpha-33
 * @version $Id: Requirement.java 8467 2009-10-05 20:55:48Z hboutemy $
 */
@Documented
@Retention(RUNTIME)
@Target({ FIELD, METHOD })
@Inherited
public @interface Requirement
{
    Class role() default Object.class;

    String hint() default "";

    //
    // HACK: This is here to support component requirement lists, which can take a list of hints
    //

    String[] hints() default {};

    boolean optional() default false;

}