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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 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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* 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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* Contributor(s): |
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* |
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* Portions Copyrighted 2013 Sun Microsystems, Inc. |
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*/ |
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package org.openide.windows; |
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|
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import java.util.Collection; |
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import java.util.concurrent.atomic.AtomicReference; |
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import org.openide.util.Lookup; |
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import org.openide.util.LookupEvent; |
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import org.openide.util.LookupListener; |
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|
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/** |
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* Allows to find another {@link CloneableOpenSupport} that all the |
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* requests passed to given one should be redirected to. This is useful |
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* for redirecting operation on <a href="@org-openide-filesystems@/org/openide/filesystems/FileObject.html"> |
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* FileObject</a> to another one in cases when two <code>FileObject</code>s |
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* represent the same physical file. |
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* <p> |
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* Instances should be registered to default lookup. |
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* @author akrasny |
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* @since 6.65 |
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*/ |
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public abstract class CloneableOpenSupportRedirector { |
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|
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private static final Lookup.Result<CloneableOpenSupportRedirector> lkp = Lookup.getDefault().lookup(new Lookup.Template<>(CloneableOpenSupportRedirector.class)); |
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private static final AtomicReference<Collection<? extends CloneableOpenSupportRedirector>> redirectors = new AtomicReference<>(); |
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private static final LookupListener listener = new LookupListener() { |
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@Override |
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public void resultChanged(LookupEvent ev) { |
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redirectors.set(lkp.allInstances()); |
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} |
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}; |
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|
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static { |
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lkp.addLookupListener(listener); |
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listener.resultChanged(null); |
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} |
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|
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/** Find a delegate for given {@link CloneableOpenSupport}'s {@link CloneableOpenSupport.Env}. |
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* |
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* @param env the environment associated with current CloneableOpenSupport |
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* @return null or another CloneableOpenSupport to use as a replacement |
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*/ |
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protected abstract CloneableOpenSupport redirect(CloneableOpenSupport.Env env); |
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|
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protected abstract void opened(CloneableOpenSupport.Env env); |
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|
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protected abstract void closed(CloneableOpenSupport.Env env); |
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|
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static CloneableOpenSupport findRedirect(CloneableOpenSupport one) { |
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final CloneableOpenSupport.Env env = one.env; |
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Collection<? extends CloneableOpenSupportRedirector> rlist = redirectors.get(); |
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if (rlist != null) { |
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for (CloneableOpenSupportRedirector r : rlist) { |
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CloneableOpenSupport ces = r.redirect(env); |
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if (ces != null && ces != one) { |
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return ces; |
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} |
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} |
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} |
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return null; |
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} |
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|
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static void notifyOpened(CloneableOpenSupport one) { |
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final CloneableOpenSupport.Env env = one.env; |
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Collection<? extends CloneableOpenSupportRedirector> rlist = redirectors.get(); |
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if (rlist != null) { |
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for (CloneableOpenSupportRedirector r : rlist) { |
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r.opened(env); |
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} |
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} |
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} |
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|
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static void notifyClosed(CloneableOpenSupport one) { |
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final CloneableOpenSupport.Env env = one.env; |
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Collection<? extends CloneableOpenSupportRedirector> rlist = redirectors.get(); |
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if (rlist != null) { |
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for (CloneableOpenSupportRedirector r : rlist) { |
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r.closed(env); |
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} |
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} |
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} |
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} |