/**

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

 *

 * Copyright 1997-2010 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 2013-2013 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;

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();

    }

}