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 java.lang.classfile.attribute; 26 27 import java.lang.constant.ClassDesc; 28 import java.util.Arrays; 29 import java.util.List; 30 31 import java.lang.classfile.Attribute; 32 import java.lang.classfile.ClassElement; 33 import java.lang.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 import jdk.internal.javac.PreviewFeature; 38 39 /** 40 * <p><b>This is NOT part of any supported API. 41 * If you write code that depends on this, you do so at your own risk. 42 * This code and its internal interfaces are subject to change or 43 * deletion without notice.</b> 44 */ 45 @PreviewFeature(feature = PreviewFeature.Feature.CLASSFILE_API) 46 public sealed interface PreloadAttribute 47 extends Attribute<PreloadAttribute>, ClassElement 48 permits BoundAttribute.BoundPreloadAttribute, UnboundAttribute.UnboundPreloadAttribute { 49 50 /** 51 * {@return the list of preload classes} 52 */ 53 List<ClassEntry> preloads(); 54 55 /** 56 * {@return a {@code Preload} attribute} 57 * @param preloads the preload classes 58 */ 59 static PreloadAttribute of(List<ClassEntry> preloads) { 60 return new UnboundAttribute.UnboundPreloadAttribute(preloads); 61 } 62 63 /** 64 * {@return a {@code Preload} attribute} 65 * @param preloads the preload classes 66 */ 67 static PreloadAttribute of(ClassEntry... preloads) { 68 return of(List.of(preloads)); 69 } 70 71 /** 72 * {@return a {@code Preload} attribute} 73 * @param preloads the preload classes 74 */ 75 static PreloadAttribute ofSymbols(List<ClassDesc> preloads) { 76 return of(Util.entryList(preloads)); 77 } 78 79 /** 80 * {@return a {@code Preload} attribute} 81 * @param preloads the preload classes 82 */ 83 static PreloadAttribute ofSymbols(ClassDesc... preloads) { 84 return ofSymbols(Arrays.asList(preloads)); 85 } 86 }