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  * 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

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  * 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

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

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  * Contributor(s):

  *

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

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

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

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

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  * 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

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 package net.java.html;

 import java.util.ServiceLoader;

 import java.util.logging.Logger;

 import org.netbeans.html.context.impl.CtxAccssr;

 import org.netbeans.html.context.impl.CtxImpl;

 import org.apidesign.html.context.spi.Contexts;

 /** Represents context where the <code>net.java.html.json.Model</code>

  * and other objects

  * operate in. The context is usually a particular HTML page in a browser.

  * The context is also associated with the actual HTML technology

  * in the HTML page - there is likely to be different context for 

  * <a href="http://knockoutjs.com">knockout.js</a> and different one

  * for <a href="http://angularjs.org">angular</a>.

  *

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

  */

 public final class BrwsrCtx {

     private static final Logger LOG = Logger.getLogger(BrwsrCtx.class.getName());

     private final CtxImpl impl;

     private BrwsrCtx(CtxImpl impl) {

         this.impl = impl;

     }

     static {

         new CtxAccssr() {

             @Override

             protected BrwsrCtx newContext(CtxImpl impl) {

                 return new BrwsrCtx(impl);

             }

             @Override

             protected CtxImpl find(BrwsrCtx context) {

                 return context.impl;

             }

         };

     }

     /** Dummy context without binding to any real browser or technology. 

      * Useful for simple unit testing of behavior of various business logic

      * code.

      */

     public static final BrwsrCtx EMPTY = Contexts.newBuilder().build();

     /** Seeks for the default context that is associated with the requesting

      * class. If no suitable context is found, a warning message is

      * printed and {@link #EMPTY} context is returned.

      * 

      * @param requestor the class that makes the request

      * @return appropriate context for the request

      */

     public static BrwsrCtx findDefault(Class<?> requestor) {

         org.apidesign.html.context.spi.Contexts.Builder cb = Contexts.newBuilder();

         boolean found = false;

         ClassLoader l;

         try {

             l = requestor.getClassLoader();

         } catch (SecurityException ex) {

             l = null;

         }

         for (org.apidesign.html.context.spi.Contexts.Provider cp : ServiceLoader.load(

             org.apidesign.html.context.spi.Contexts.Provider.class, l

         )) {

             cp.fillContext(cb, requestor);

             found = true;

         }

         try {

             for (org.apidesign.html.context.spi.Contexts.Provider cp : ServiceLoader.load(org.apidesign.html.context.spi.Contexts.Provider.class, org.apidesign.html.context.spi.Contexts.Provider.class.getClassLoader())) {

                 cp.fillContext(cb, requestor);

                 found = true;

             }

         } catch (SecurityException ex) {

             if (!found) {

                 throw ex;

             }

             // if we have some data from regular provides, go on

         }

         if (!found) {

             for (org.apidesign.html.context.spi.Contexts.Provider cp : ServiceLoader.load(org.apidesign.html.context.spi.Contexts.Provider.class)) {

                 cp.fillContext(cb, requestor);

                 found = true;

             }

         }

         if (!found) {

             LOG.warning("No browser context found. Returning empty technology!");

             return EMPTY;

         }

         return cb.build();

     }

 }