/*
 * Copyright 2002-2019 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.beans.factory.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;

/**
 * Annotation at the field or method/constructor parameter level
 * that indicates a default value expression for the affected argument.
 *
 * <p>Typically used for expression-driven dependency injection. Also supported
 * for dynamic resolution of handler method parameters, e.g. in Spring MVC.
 *
 * <p>A common use case is to assign default field values using
 * <code>#{systemProperties.myProp}</code> style expressions.
 *
 * <p>Note that actual processing of the {@code @Value} annotation is performed
 * by a {@link org.springframework.beans.factory.config.BeanPostProcessor
 * BeanPostProcessor} which in turn means that you <em>cannot</em> use
 * {@code @Value} within
 * {@link org.springframework.beans.factory.config.BeanPostProcessor
 * BeanPostProcessor} or
 * {@link org.springframework.beans.factory.config.BeanFactoryPostProcessor BeanFactoryPostProcessor}
 * types. Please consult the javadoc for the {@link AutowiredAnnotationBeanPostProcessor}
 * class (which, by default, checks for the presence of this annotation).
 *
 * @author Juergen Hoeller
 * @since 3.0
 * @see AutowiredAnnotationBeanPostProcessor
 * @see Autowired
 * @see org.springframework.beans.factory.config.BeanExpressionResolver
 * @see org.springframework.beans.factory.support.AutowireCandidateResolver#getSuggestedValue
 */
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Value {

	/**
	 * The actual value expression &mdash; for example, <code>#{systemProperties.myProp}</code>.
	 */
	String value();

}

@@ -20,10 +20,10 @@
 2-20
-19
+20
  the
@@ -891,16 +891,21 @@
 otation 
+used 
 at the f
@@ -1005,20 +1005,20 @@
 he a
-ffected argu
+nnotated ele
 ment
@@ -1065,16 +1065,35 @@
 -driven 
+or property-driven 
 dependen
@@ -1105,16 +1105,19 @@
 jection.
+%0A *
  Also su
@@ -1123,19 +1123,16 @@
 upported
-%0A *
  for dyn
@@ -1169,24 +1169,41 @@
 hod 
-p
 ar
-ameters, e.g.
+guments &mdash; for%0A * example,
  in 
@@ -1251,28 +1251,14 @@
  to 
-assign default field
+inject
  val
@@ -1316,26 +1316,169 @@
 %3E style 
-expression
+SpEL (Spring Expression Language)%0A * expressions. Alternatively, values may be injected using%0A * %3Ccode%3E$%7Bmy.app.myProp%7D%3C/code%3E style property placeholder
 s.%0A *%0A *
@@ -2579,28 +2579,15 @@
 ion 
-&mdash; for example,
+such as
  %3Cco
@@ -2622,16 +2622,82 @@
 %7D%3C/code%3E
+%0A%09 * or property placeholder such as %3Ccode%3E$%7Bmy.app.myProp%7D%3C/code%3E
 .%0A%09 */%0A%09

Improve Javadoc for @Value regarding supported expressions