/**

  * 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 org.netbeans.html.json.spi;

 import java.io.IOException;

 import java.io.InputStream;

 import org.netbeans.html.context.spi.Contexts.Builder;

 /** A {@link Builder service provider interface} responsible for 

  * conversion of JSON objects to Java ones and vice-versa.

  *

  * @author Jaroslav Tulach

  */

 public interface Transfer {

     /**

      * Called to inspect properties of an object (usually a JSON or JavaScript

      * wrapper).

      *

      * @param obj the object to inspect

      * @param props the names of properties to check on the object

      * <code>obj</code>

      * @param values array of the same length as <code>props</code> should be

      * filled by values of properties on the <code>obj</code>. If a property is

      * not defined, a <code>null</code> value should be stored in the array

      */

     public void extract(Object obj, String[] props, Object[] values);

     /** Reads content of a stream and creates its JSON representation.

      * The returned object is implementation dependant. It however needs

      * to be acceptable as first argument of {@link #extract(java.lang.Object, java.lang.String[], java.lang.Object[]) extract}

      * method. If the stream contains representation or a JSON array,

      * an Object[] should be returned - each of its members should, by itself

      * be acceptable argument to 

      * the {@link #extract(java.lang.Object, java.lang.String[], java.lang.Object[]) extract} method.

      * 

      * @param is input stream to read data from

      * @return an object representing the JSON data

      * @throws IOException if something goes wrong

      */

     public Object toJSON(InputStream is) throws IOException;

     /** Starts the JSON or JSONP query. 

      * 

      * @param call description of the call to make

      */

     public void loadJSON(JSONCall call);

 }