spring security PreFilter 源码
spring security PreFilter 代码
文件路径：/core/src/main/java/org/springframework/security/access/prepost/PreFilter.java
/*
* Copyright 2002-2016 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.security.access.prepost;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotation for specifying a method filtering expression which will be evaluated before
* a method has been invoked. The name of the argument to be filtered is specified using
* the <tt>filterTarget</tt> attribute. This must be a Java Collection implementation
* which supports the {@link java.util.Collection#remove(Object) remove} method.
* Pre-filtering isn't supported on array types and will fail if the value of named filter
* target argument is null at runtime.
* <p>
* For methods which have a single argument which is a collection type, this argument will
* be used as the filter target.
* <p>
* The annotation value contains the expression which will be evaluated for each element
* in the collection. If the expression evaluates to false, the element will be removed.
* The reserved name "filterObject" can be used within the expression to refer to the
* current object which is being evaluated.
*
* @author Luke Taylor
* @since 3.0
*/
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface PreFilter {
/**
* @return the Spring-EL expression to be evaluated before invoking the protected
* method
*/
String value();
/**
* @return the name of the parameter which should be filtered (must be a non-null
* collection instance) If the method contains a single collection argument, then this
* attribute can be omitted.
*/
String filterTarget() default "";
}
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