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/*
* Copyright 2002-2015 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.springframework.web.bind.annotation;
import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.core.annotation.AliasFor;
import org.springframework.stereotype.Component;
/**
* Indicates the annotated class assists a "Controller".
*
* <p>Serves as a specialization of {@link Component @Component}, allowing for
* implementation classes to be autodetected through classpath scanning.
*
* <p>It is typically used to define {@link ExceptionHandler @ExceptionHandler},
* {@link InitBinder @InitBinder}, and {@link ModelAttribute @ModelAttribute}
* methods that apply to all {@link RequestMapping @RequestMapping} methods.
*
* <p>One of {@link #annotations()}, {@link #basePackageClasses()},
* {@link #basePackages()} or its alias {@link #value()}
* may be specified to define specific subsets of Controllers
* to assist. When multiple selectors are applied, OR logic is applied -
* meaning selected Controllers should match at least one selector.
*
* <p>The default behavior (i.e. if used without any selector),
* the {@code @ControllerAdvice} annotated class will
* assist all known Controllers.
*
* <p>Note that those checks are done at runtime, so adding many attributes and using
* multiple strategies may have negative impacts (complexity, performance).
*
* @author Rossen Stoyanchev
* @author Brian Clozel
* @author Sam Brannen
* @since 3.2
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Component
public @interface ControllerAdvice {
/**
* Alias for the {@link #basePackages} attribute.
* <p>Allows for more concise annotation declarations e.g.:
* {@code @ControllerAdvice("org.my.pkg")} is equivalent to
* {@code @ControllerAdvice(basePackages="org.my.pkg")}.
* @since 4.0
* @see #basePackages()
*/
@AliasFor("basePackages")
String[] value() default {};
/**
* Array of base packages.
* <p>Controllers that belong to those base packages or sub-packages thereof
* will be included, e.g.: {@code @ControllerAdvice(basePackages="org.my.pkg")}
* or {@code @ControllerAdvice(basePackages={"org.my.pkg", "org.my.other.pkg"})}.
* <p>{@link #value} is an alias for this attribute, simply allowing for
* more concise use of the annotation.
* <p>Also consider using {@link #basePackageClasses()} as a type-safe
* alternative to String-based package names.
* @since 4.0
*/
@AliasFor("value")
String[] basePackages() default {};
/**
* Type-safe alternative to {@link #value()} for specifying the packages
* to select Controllers to be assisted by the {@code @ControllerAdvice}
* annotated class.
* <p>Consider creating a special no-op marker class or interface in each package
* that serves no purpose other than being referenced by this attribute.
* @since 4.0
*/
Class<?>[] basePackageClasses() default {};
/**
* Array of classes.
* <p>Controllers that are assignable to at least one of the given types
* will be assisted by the {@code @ControllerAdvice} annotated class.
* @since 4.0
*/
Class<?>[] assignableTypes() default {};
/**
* Array of annotations.
* <p>Controllers that are annotated with this/one of those annotation(s)
* will be assisted by the {@code @ControllerAdvice} annotated class.
* <p>Consider creating a special annotation or use a predefined one,
* like {@link RestController @RestController}.
* @since 4.0
*/
Class<? extends Annotation>[] annotations() default {};
}
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