/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

 * License.  When distributing the software, include this License Header

 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

 * your own identifying information:

 * "Portions Copyrighted [year] [name of copyright owner]"

 *

 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

 * under the [CDDL or GPL Version 2] license." If you do not indicate a

 * single choice of license, a recipient has the option to distribute

 * your version of this file under either the CDDL, the GPL Version 2 or

 * to extend the choice of license to its licensees as provided above.

 * However, if you add GPL Version 2 code and therefore, elected the GPL

 * Version 2 license, then the option applies only if the new code is

 * made subject to such option by the copyright holder.

 */

package net.java.html.json;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

/** Static methods in classes annotated by {@link Model}

 * can be marked by this annotation to establish a 

 * <a href="http://en.wikipedia.org/wiki/JSON">JSON</a>

 * communication point.

 * The associated model class then gets new method to invoke a network

 * connection. Example follows:

 * 

 * <pre>

 * {@link Model @Model}(className="MyModel", properties={

 *   {@link Property @Property}(name = "people", type=Person.class, array=true)

 * })

 * class MyModelImpl {

 *   {@link Model @Model}(className="Person", properties={

 *     {@link Property @Property}(name = "firstName", type=String.class),

 *     {@link Property @Property}(name = "lastName", type=String.class)

 *   })

 *   static class PersonImpl {

 *     {@link ComputedProperty @ComputedProperty}

 *     static String fullName(String firstName, String lastName) {

 *       return firstName + " " + lastName;

 *     }

 *   }

 * 

 *   {@link OnReceive @OnReceive}(url = "{protocol}://your.server.com/person/{name}")

 *   static void getANewPerson(MyModel m, Person p) {

 *     alert("Adding " + p.getFullName() + '!');

 *     m.getPeople().add(p);

 *   }

 * 

 *   // the above will generate method <code>getANewPerson</code> in class <code>MyModel</code>.

 *   // with <code>protocol</code> and <code>name</code> arguments

 *   // which asynchronously contacts the server and in case of success calls

 *   // your {@link OnReceive @OnReceive} with parsed in data

 * 

 *   {@link Function @Function}

 *   static void requestSmith(MyModel m) {

 *     m.getANewPerson("http", "Smith");

 *   }

 * }

 * </pre>

 * When the server returns <code>{ "firstName" : "John", "lastName" : "Smith" }</code>

 * the browser will show alert message <em>Adding John Smith!</em>.

 * <p>

 * One can use this method to communicate with the server

 * via <a href="doc-files/websockets.html">WebSocket</a> protocol since version 0.6.

 * Read the <a href="doc-files/websockets.html">tutorial</a> to see how.

 * <p>

 * Visit an <a target="_blank" href="http://dew.apidesign.org/dew/#7138581">on-line demo</a>

 * to see REST access via {@link OnReceive} annotation.

 * 

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 * @since 0.3

 */

@Retention(RetentionPolicy.SOURCE)

@Target(ElementType.METHOD)

public @interface OnReceive {

    /** The URL to connect to. Can contain variable names surrounded by '{' and '}'.

     * Those parameters will then become variables of the associated method.

     * 

     * @return the (possibly parametrized) url to connect to

     */

    String url();

    /** Support for <a href="http://en.wikipedia.org/wiki/JSONP">JSONP</a> requires

     * a callback from the server generated page to a function defined in the

     * system. The name of such function is usually specified as a property

     * (of possibly different names). By defining the <code>jsonp</code> attribute

     * one turns on the <a href="http://en.wikipedia.org/wiki/JSONP">JSONP</a> 

     * transmission and specifies the name of the property. The property should

     * also be used in the {@link #url()} attribute on appropriate place.

     * 

     * @return name of a property to carry the name of <a href="http://en.wikipedia.org/wiki/JSONP">JSONP</a>

     *    callback function.

     */

    String jsonp() default "";

    /** The model class to be send to the server as JSON data.

     * By default no data are sent. However certain {@link #method() transport methods}

     * (like <code>"PUT"</code> and <code>"POST"</code>) require the 

     * data to be specified.

     * 

     * @return name of a class generated using {@link Model @Model} annotation

     * @since 0.3

     */

    Class<?> data() default Object.class;

    /** The HTTP transfer method to use. Defaults to <code>"GET"</code>.

     * Other typical methods include <code>"HEAD"</code>, 

     * <code>"DELETE"</code>, <code>"POST"</code>, <code>"PUT"</code>.

     * The last two mentioned methods require {@link #data()} to be specified.

     * <p>

     * When {@link #jsonp() JSONP} transport is requested, the method 

     * has to be <code>"GET"</code>.

     * <p>

     * Since version 0.5 one can specify "<a href="doc-files/websockets.html">WebSocket</a>"

     * as the communication method.

     * 

     * @return name of the HTTP transfer method

     * @since 0.3

     */

    String method() default "GET";

    /** Name of a method in this class which should be called in case of 

     * an error. The method has to be non-private and take one model and 

     * one {@link Exception} 

     * parameter. If this method is not specified, the exception is just

     * printed to console.

     * 

     * @return name of method in this class

     * @since 0.5

     */

    public String onError() default "";    

}