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/**
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
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*
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* Oracle and Java are registered trademarks of Oracle and/or its affiliates.
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* Other names may be trademarks of their respective owners.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* License. When distributing the software, include this License Header
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* Notice in each file and include the License file at
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* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the GPL Version 2 section of the License file that
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* accompanied this code. If applicable, add the following below the
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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*
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* Contributor(s):
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*
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
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*
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* If you wish your version of this file to be governed by only the CDDL
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* or only the GPL Version 2, indicate your decision by adding
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* "[Contributor] elects to include this software in this distribution
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* under the [CDDL or GPL Version 2] license." If you do not indicate a
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* single choice of license, a recipient has the option to distribute
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* your version of this file under either the CDDL, the GPL Version 2 or
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* to extend the choice of license to its licensees as provided above.
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* However, if you add GPL Version 2 code and therefore, elected the GPL
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* Version 2 license, then the option applies only if the new code is
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* made subject to such option by the copyright holder.
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*/
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package net.java.html;
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import java.util.ServiceLoader;
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import java.util.logging.Logger;
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import org.netbeans.html.context.impl.CtxAccssr;
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import org.netbeans.html.context.impl.CtxImpl;
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import org.apidesign.html.context.spi.Contexts;
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/** Represents context where the <code>net.java.html.json.Model</code>
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* and other objects
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* operate in. The context is usually a particular HTML page in a browser.
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* The context is also associated with the actual HTML technology
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* in the HTML page - there is likely to be different context for
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* <a href="http://knockoutjs.com">knockout.js</a> and different one
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* for <a href="http://angularjs.org">angular</a>.
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public final class BrwsrCtx {
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private static final Logger LOG = Logger.getLogger(BrwsrCtx.class.getName());
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private final CtxImpl impl;
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private BrwsrCtx(CtxImpl impl) {
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this.impl = impl;
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}
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static {
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new CtxAccssr() {
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@Override
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protected BrwsrCtx newContext(CtxImpl impl) {
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return new BrwsrCtx(impl);
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}
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@Override
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protected CtxImpl find(BrwsrCtx context) {
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return context.impl;
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}
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};
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}
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/** Dummy context without binding to any real browser or technology.
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* Useful for simple unit testing of behavior of various business logic
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* code.
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*/
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public static final BrwsrCtx EMPTY = Contexts.newBuilder().build();
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/** Seeks for the default context that is associated with the requesting
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* class. If no suitable context is found, a warning message is
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* printed and {@link #EMPTY} context is returned.
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*
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* @param requestor the class that makes the request
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* @return appropriate context for the request
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*/
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public static BrwsrCtx findDefault(Class<?> requestor) {
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org.apidesign.html.context.spi.Contexts.Builder cb = Contexts.newBuilder();
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boolean found = false;
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ClassLoader l;
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try {
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l = requestor.getClassLoader();
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} catch (SecurityException ex) {
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l = null;
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}
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for (org.apidesign.html.context.spi.Contexts.Provider cp : ServiceLoader.load(
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org.apidesign.html.context.spi.Contexts.Provider.class, l
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)) {
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cp.fillContext(cb, requestor);
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found = true;
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}
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try {
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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())) {
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cp.fillContext(cb, requestor);
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found = true;
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}
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} catch (SecurityException ex) {
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if (!found) {
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throw ex;
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}
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// if we have some data from regular provides, go on
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}
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if (!found) {
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for (org.apidesign.html.context.spi.Contexts.Provider cp : ServiceLoader.load(org.apidesign.html.context.spi.Contexts.Provider.class)) {
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cp.fillContext(cb, requestor);
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found = true;
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}
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}
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if (!found) {
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LOG.warning("No browser context found. Returning empty technology!");
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return EMPTY;
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}
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return cb.build();
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}
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}
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