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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
 *
 * 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://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * 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.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * 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 don't 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 org.glassfish.jersey.server;

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;

/**
 * This annotation can be used to define the JavaScript callback function name if the valid JSONP format is requested as an
 * acceptable {@link javax.ws.rs.core.MediaType media type} of this request. At the moment only resource methods should be
 * annotated with this annotation.
 * 
 * The acceptable JavaScript media types for JSONP compatible with this annotation are:
 * 

 * application/x-javascript
 * application/javascript
 * application/ecmascript
 * text/javascript
 * text/x-javascript
 * text/ecmascript
 * text/jscript
 * 
 * 
 * Note: Determining the JavaScript callback function name from a query parameter ({@link #queryParam}) takes precedence over
 * the {@link #callback()} value.
 *
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface JSONP {

    /**
     * Default JavaScript callback function name.
     */
    public static final String DEFAULT_CALLBACK = "callback";

    /**
     * Default query parameter name to obtain the JavaScript callback function name from.
     */
    public static final String DEFAULT_QUERY = "__callback";

    /**
     * Name of the JavaScript callback function to which the JSON result should be wrapped into.
     */
    String callback() default DEFAULT_CALLBACK;

    /**
     * If set then the JavaScript callback function name is obtained from a query parameter with the given name. If this query
     * parameter is not present in the request then the value of {@link #callback()} property is used as the JavaScript callback
     * function name.
     */
    String queryParam() default "";
}