spring ConfigurationPropertiesScan 源码
springboot ConfigurationPropertiesScan 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesScan.java
/*
* Copyright 2012-2020 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.context.properties;
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.context.annotation.Import;
import org.springframework.core.annotation.AliasFor;
import org.springframework.stereotype.Component;
/**
* Configures the base packages used when scanning for
* {@link ConfigurationProperties @ConfigurationProperties} classes. One of
* {@link #basePackageClasses()}, {@link #basePackages()} or its alias {@link #value()}
* may be specified to define specific packages to scan. If specific packages are not
* defined scanning will occur from the package of the class with this annotation.
* <p>
* Note: Classes annotated or meta-annotated with {@link Component @Component} will not be
* picked up by this annotation.
*
* @author Madhura Bhave
* @since 2.2.0
*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(ConfigurationPropertiesScanRegistrar.class)
@EnableConfigurationProperties
public @interface ConfigurationPropertiesScan {
/**
* Alias for the {@link #basePackages()} attribute. Allows for more concise annotation
* declarations e.g.: {@code @ConfigurationPropertiesScan("org.my.pkg")} instead of
* {@code @ConfigurationPropertiesScan(basePackages="org.my.pkg")}.
* @return the base packages to scan
*/
@AliasFor("basePackages")
String[] value() default {};
/**
* Base packages to scan for configuration properties. {@link #value()} is an alias
* for (and mutually exclusive with) this attribute.
* <p>
* 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 configuration properties. The package of each class specified will be
* scanned.
* <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.
* @return classes from the base packages to scan
*/
Class<?>[] basePackageClasses() default {};
}
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