org.springframework.boot.web.servlet.ServletComponentScan Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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
*
* https://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.boot.web.servlet;
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 javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebListener;
import javax.servlet.annotation.WebServlet;
import org.springframework.context.annotation.Import;
import org.springframework.core.annotation.AliasFor;
/**
* Enables scanning for Servlet components ({@link WebFilter filters}, {@link WebServlet
* servlets}, and {@link WebListener listeners}). Scanning is only performed when using an
* embedded web server.
*
* Typically, one of {@code value}, {@code basePackages}, or {@code basePackageClasses}
* should be specified to control the packages to be scanned for components. In their
* absence, scanning will be performed from the package of the class with the annotation.
*
* @author Andy Wilkinson
* @since 1.3.0
* @see WebServlet
* @see WebFilter
* @see WebListener
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(ServletComponentScanRegistrar.class)
public @interface ServletComponentScan {
/**
* Alias for the {@link #basePackages()} attribute. Allows for more concise annotation
* declarations e.g.: {@code @ServletComponentScan("org.my.pkg")} instead of
* {@code @ServletComponentScan(basePackages="org.my.pkg")}.
* @return the base packages to scan
*/
@AliasFor("basePackages")
String[] value() default {};
/**
* Base packages to scan for annotated servlet components. {@link #value()} is an
* alias for (and mutually exclusive with) this attribute.
*
* Use {@link #basePackageClasses()} for a type-safe alternative to String-based
* package names.
* @return the base packages to scan
*/
@AliasFor("value")
String[] basePackages() default {};
/**
* Type-safe alternative to {@link #basePackages()} for specifying the packages to
* scan for annotated servlet components. The package of each class specified will be
* scanned.
* @return classes from the base packages to scan
*/
Class[] basePackageClasses() default {};
}