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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 org.netbeans.html.boot.impl;
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import java.io.Closeable;
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import java.io.Flushable;
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import java.io.IOException;
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import java.util.logging.Logger;
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import org.netbeans.html.boot.spi.Fn;
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/**
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*
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* @author Jaroslav Tulach
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*/
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public final class FnContext implements Closeable {
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private static final Logger LOG = Logger.getLogger(FnContext.class.getName());
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private static final FnContext DUMMY;
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static {
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DUMMY = new FnContext(null, null);
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DUMMY.prev = DUMMY;
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}
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private Object prev;
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private final Fn.Presenter current;
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private FnContext(Fn.Presenter prevP, Fn.Presenter newP) {
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this.current = newP;
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this.prev = prevP;
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}
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@Override
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public void close() throws IOException {
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if (prev != this) {
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currentPresenter((Fn.Presenter)prev);
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prev = this;
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if (current instanceof Flushable) {
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((Flushable)current).flush();
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}
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}
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}
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/*
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@Override
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protected void finalize() throws Throwable {
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if (prev != null) {
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LOG.warning("Unclosed context!");
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}
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}
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*/
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public static Closeable activate(Fn.Presenter newP) {
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final Fn.Presenter oldP = currentPresenter(newP);
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if (oldP == newP) {
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return DUMMY;
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}
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return new FnContext(oldP, newP);
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}
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private static final ThreadLocal<Fn.Presenter> CURRENT = new ThreadLocal<Fn.Presenter>();
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public static Fn.Presenter currentPresenter(Fn.Presenter p) {
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Fn.Presenter prev = CURRENT.get();
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CURRENT.set(p);
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return prev;
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}
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public static Fn.Presenter currentPresenter(boolean fail) {
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Fn.Presenter p = CURRENT.get();
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if (p == null && fail) {
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throw new IllegalStateException("No current WebView context around!");
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}
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return p;
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}
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}
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