/*
 * 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
 *
 *      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;

import org.springframework.core.annotation.AliasFor;
import org.springframework.ui.Model;

Annotation that binds a method parameter or method return value to a named model attribute, exposed to a web view. Supported for controller classes with @RequestMapping methods. 
Can be used to expose command objects to a web view, using specific attribute names, through annotating corresponding parameters of an @RequestMapping method. 
Can also be used to expose reference data to a web view through annotating accessor methods in a controller class with @RequestMapping methods. Such accessor methods are allowed to have any arguments that @RequestMapping methods support, returning the model attribute value to expose. 
Note however that reference data and all other model content is not available to web views when request processing results in an Exception since the exception could be raised at any time making the content of the model unreliable. For this reason @ExceptionHandler methods do not provide access to a Model argument. 
Author:
Juergen Hoeller, Rossen Stoyanchev
Since:
2.5/**
 * Annotation that binds a method parameter or method return value
 * to a named model attribute, exposed to a web view. Supported
 * for controller classes with {@link RequestMapping @RequestMapping}
 * methods.
 *
 * <p>Can be used to expose command objects to a web view, using
 * specific attribute names, through annotating corresponding
 * parameters of an {@link RequestMapping @RequestMapping} method.
 *
 * <p>Can also be used to expose reference data to a web view
 * through annotating accessor methods in a controller class with
 * {@link RequestMapping @RequestMapping} methods. Such accessor
 * methods are allowed to have any arguments that
 * {@link RequestMapping @RequestMapping} methods support, returning
 * the model attribute value to expose.
 *
 * <p>Note however that reference data and all other model content is
 * not available to web views when request processing results in an
 * {@code Exception} since the exception could be raised at any time
 * making the content of the model unreliable. For this reason
 * {@link ExceptionHandler @ExceptionHandler} methods do not provide
 * access to a {@link Model} argument.
 *
 * @author Juergen Hoeller
 * @author Rossen Stoyanchev
 * @since 2.5
 */
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ModelAttribute {

	
Alias for name. /**
	 * Alias for {@link #name}.
	 */
	@AliasFor("name")
	String value() default "";

	
The name of the model attribute to bind to.
The default model attribute name is inferred from the declared
attribute type (i.e. the method parameter type or method return type),
based on the non-qualified class name:
e.g. "orderAddress" for class "mypackage.OrderAddress",
or "orderAddressList" for "List<mypackage.OrderAddress>".
Since:
4.3/**
	 * The name of the model attribute to bind to.
	 * <p>The default model attribute name is inferred from the declared
	 * attribute type (i.e. the method parameter type or method return type),
	 * based on the non-qualified class name:
	 * e.g. "orderAddress" for class "mypackage.OrderAddress",
	 * or "orderAddressList" for "List&lt;mypackage.OrderAddress&gt;".
	 * @since 4.3
	 */
	@AliasFor("value")
	String name() default "";

	
Allows declaring data binding disabled directly on an @ModelAttribute method parameter or on the attribute returned from an @ModelAttribute method, both of which would prevent data binding for that attribute. 
By default this is set to true in which case data binding applies. Set this to false to disable data binding. 
Since:
4.3/**
	 * Allows declaring data binding disabled directly on an {@code @ModelAttribute}
	 * method parameter or on the attribute returned from an {@code @ModelAttribute}
	 * method, both of which would prevent data binding for that attribute.
	 * <p>By default this is set to {@code true} in which case data binding applies.
	 * Set this to {@code false} to disable data binding.
	 * @since 4.3
	 */
	boolean binding() default true;

}