/*
* Copyright 2002-2010 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.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotation which indicates that a method parameter should be bound to a web request header.
* Supported for annotated handler methods in Servlet and Portlet environments.
*
* @author Juergen Hoeller
* @since 3.0
* @see RequestMapping
* @see RequestParam
* @see CookieValue
* @see org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter
* @see org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestHeader {
/**
* The name of the request header to bind to.
*/
String value() default "";
/**
* Whether the header is required.
* <p>Default is <code>true</code>, leading to an exception thrown in case
* of the header missing in the request. Switch this to <code>false</code>
* if you prefer a <code>null</value> in case of the header missing.
* <p>Alternatively, provide a {@link #defaultValue() defaultValue},
* which implicitely sets this flag to <code>false</code>.
*/
boolean required() default true;
/**
* The default value to use as a fallback. Supplying a default value implicitely
* sets {@link #required()} to false.
*/
String defaultValue() default ValueConstants.DEFAULT_NONE;
}
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