1 /*
 2  * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 package jdk.internal.classfile.attribute;
26 
27 import java.lang.constant.ClassDesc;
28 import java.util.Arrays;
29 import java.util.List;
30 
31 import jdk.internal.classfile.Attribute;
32 import jdk.internal.classfile.ClassElement;
33 import jdk.internal.classfile.constantpool.ClassEntry;
34 import jdk.internal.classfile.impl.BoundAttribute;
35 import jdk.internal.classfile.impl.UnboundAttribute;
36 import jdk.internal.classfile.impl.Util;
37 
38 /**
39  *  <p><b>This is NOT part of any supported API.
40  *  If you write code that depends on this, you do so at your own risk.
41  *  This code and its internal interfaces are subject to change or
42  *  deletion without notice.</b>
43  */
44 public sealed interface PreloadAttribute
45         extends Attribute<PreloadAttribute>, ClassElement
46         permits BoundAttribute.BoundPreloadAttribute, UnboundAttribute.UnboundPreloadAttribute {
47 
48     /**
49      * {@return the list of preload classes}
50      */
51     List<ClassEntry> preloads();
52 
53     /**
54      * {@return a {@code Preload} attribute}
55      * @param preloads the preload classes
56      */
57     static PreloadAttribute of(List<ClassEntry> preloads) {
58         return new UnboundAttribute.UnboundPreloadAttribute(preloads);
59     }
60 
61     /**
62      * {@return a {@code Preload} attribute}
63      * @param preloads the preload classes
64      */
65     static PreloadAttribute of(ClassEntry... preloads) {
66         return of(List.of(preloads));
67     }
68 
69     /**
70      * {@return a {@code Preload} attribute}
71      * @param preloads the preload classes
72      */
73     static PreloadAttribute ofSymbols(List<ClassDesc> preloads) {
74         return of(Util.entryList(preloads));
75     }
76 
77     /**
78      * {@return a {@code Preload} attribute}
79      * @param preloads the preload classes
80      */
81     static PreloadAttribute ofSymbols(ClassDesc... preloads) {
82         return ofSymbols(Arrays.asList(preloads));
83     }
84 }