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/*
 * Copyright 2012 Guido Steinacker
 *
 * 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 de.otto.jsonhome.annotation;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE;

/**
 * Documentation of a link-relation type (@Rel) or a variable used in an uri-template.
 * 
 * Link-relation types must be documented at class-level and must specify the documented
 * type using the {@link #rel()} attribute.
 * 

 * If you want to document more than one link-relation type in a single controller, you must
 * use the {@link Docs} annotation to add multiple Doc instances to the class.
 * 

 * In case of documenting a href-template variable, the {@code rel} attribute is ignored.
 *
 * @author Guido Steinacker
 * @since 15.09.12
 */
@Target({TYPE, PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface Doc {

    /**
     * Optional value, consisting of one or more paragraphs.
     */
    String[] value() default "";

    /**
     * Optional relative URI pointing to a Markdown document to include into the
     * HTML description of the documentation.
     */
    String include() default "";

    /**
     * Optional fully qualified URI pointing to external documentation.
     */
    String link() default "";

    /**
     * The URI uniquely identifying the link relation type.
     * 
     * If this is a documentation of a link-relation type, this attribute must be provided. Otherwise, the
     * documentation can not be attached to the proper link-relation type.
     *
     * @return URI of the link relation type
     */
    String rel() default "";

}