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/*
 * 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;


/**
 * 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.
 * 
 * 
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.
 * 

 * 
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.
 * 

 * 
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
 * methods do not provide
 * access to a argument.
 *
 * @author Juergen Hoeller
 * @author Rossen Stoyanchev
 * @since 2.5
 */
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ModelAttribute {

    /**
     * Alias for {@link #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
     */
    String name() default "";

    /**
     * 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.
     * 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;

}