| /* | |
| * Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved. | |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| * | |
| * This code is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License version 2 only, as | |
| * published by the Free Software Foundation. Oracle designates this | |
| * particular file as subject to the "Classpath" exception as provided | |
| * by Oracle in the LICENSE file that accompanied this code. | |
| * | |
| * This code is distributed in the hope that it will be useful, but WITHOUT | |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| * version 2 for more details (a copy is included in the LICENSE file that | |
| * accompanied this code). | |
| * | |
| * You should have received a copy of the GNU General Public License version | |
| * 2 along with this work; if not, write to the Free Software Foundation, | |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| * | |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| * or visit www.oracle.com if you need additional information or have any | |
| * questions. | |
| */ | |
| package java.lang.classfile; | |
| /** | |
| * Marker interface for structures with special capabilities in the {@code | |
| * class} file format. {@link AttributedElement} indicates a structure has | |
| * {@link Attribute}s. {@link CompoundElement} indicates a structure can be | |
| * viewed as a composition of member structures, whose memberships are marked by | |
| * {@link ClassElement}, {@link MethodElement}, {@link FieldElement}, or {@link | |
| * CodeElement}. | |
| * | |
| * <h2 id="membership">Membership Elements</h2> | |
| * {@link ClassModel}, {@link MethodModel}, {@link FieldModel}, and {@link | |
| * CodeModel} each has a dedicated interface marking its member structures: | |
| * {@link ClassElement}, {@link MethodElement}, {@link FieldElement}, and | |
| * {@link CodeElement}. They can be supplied to a {@link ClassBuilder}, a | |
| * {@link MethodBuilder}, a {@link FieldBuilder}, or a {@link CodeBuilder} to be | |
| * included as members of the built model. Unless otherwise specified, these | |
| * structures are delivered during the {@linkplain CompoundElement traversal} of | |
| * the corresponding models. Some of these elements may appear at most once or | |
| * exactly once in the traversal of the models; such elements have special | |
| * treatment by {@link ClassFileBuilder} and are specified in their modeling | |
| * interfaces. If such elements appear multiple times during traversal, the | |
| * last occurrence should be used and all previous instances should be | |
| * discarded. | |
| * <p> | |
| * These membership element marker interfaces are sealed; future versions of the | |
| * Java SE Platform may define new elements to the sealed hierarchy when the | |
| * {@code class} file format for the Java Platform evolves. Using an exhaustive | |
| * pattern matching switch over these hierarchies indicates the user only wish | |
| * the processing code to run on a specific version of Java Platform, and will | |
| * fail if unknown new elements are encountered. | |
| * | |
| * @sealedGraph | |
| * @since 24 | |
| */ | |
| public sealed interface ClassFileElement | |
| permits AttributedElement, CompoundElement, Attribute, | |
| ClassElement, CodeElement, FieldElement, MethodElement { | |
| } |