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Java > Open Source Codes > org > openide > text > CloneableEditorSupportRedirector


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans.
16  * Portions Copyrighted 2007 Sun Microsystems, Inc.
17  */
18 package org.openide.text;
19
20 import org.openide.util.Lookup;
21
22 /**
23  * Allows to find another {@link CloneableEditorSupport} that all the
24  * requests passed to given one should be redirected to. This is useful
25  * for redirecting operation on <a HREF="@org-openide-filesystems@/org/openide/filesystems/FileObject.html">
26  * FileObject</a> to another one in cases when two <code>FileObject</code>s
27  * represent the same physical file.
28  * <p>
29  * Instances should be registered to default lookup.
30  * @author Jaroslav Tulach
31  * @since 6.13
32  */
33 public abstract class CloneableEditorSupportRedirector {
34     /** Find a delegate for given {@link CloneableEditorSupport}'s {@link Lookup}.
35      * The common code can be to extract for example a
36      * <a HREF="@org-openide-filesystems@/org/openide/filesystems/FileObject.html">
37      * FileObject</a> from the lookup and use its location to find another
38      * <code>CloneableEditorSupport</code> to delegate to.
39      *
40      * @param env the environment associated with current CloneableEditorSupport
41      * @return null or another CloneableEditorSupport to use as a replacement
42      */
43     protected abstract CloneableEditorSupport redirect(Lookup env);
44     
45     static CloneableEditorSupport findRedirect(CloneableEditorSupport one) {
46         for (CloneableEditorSupportRedirector r : Lookup.getDefault().lookupAll(CloneableEditorSupportRedirector.class)) {
47             CloneableEditorSupport ces = r.redirect(one.getLookup());
48             if (ces != null && ces != one) {
49                 return ces;
50             }
51         }
52         return null;
53     }
54 }
55
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