1 /*
  2  * Copyright (c) 2022, 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;
 26 
 27 import java.lang.classfile.attribute.AnnotationDefaultAttribute;
 28 import java.lang.classfile.attribute.BootstrapMethodsAttribute;
 29 import java.lang.classfile.attribute.CharacterRangeTableAttribute;
 30 import java.lang.classfile.attribute.CodeAttribute;
 31 import java.lang.classfile.attribute.CompilationIDAttribute;
 32 import java.lang.classfile.attribute.ConstantValueAttribute;
 33 import java.lang.classfile.attribute.DeprecatedAttribute;
 34 import java.lang.classfile.attribute.EnclosingMethodAttribute;
 35 import java.lang.classfile.attribute.ExceptionsAttribute;
 36 import java.lang.classfile.attribute.InnerClassesAttribute;
 37 import java.lang.classfile.attribute.LineNumberTableAttribute;
 38 import java.lang.classfile.attribute.LoadableDescriptorsAttribute;
 39 import java.lang.classfile.attribute.LocalVariableTableAttribute;
 40 import java.lang.classfile.attribute.LocalVariableTypeTableAttribute;
 41 import java.lang.classfile.attribute.MethodParametersAttribute;
 42 import java.lang.classfile.attribute.ModuleAttribute;
 43 import java.lang.classfile.attribute.ModuleHashesAttribute;
 44 import java.lang.classfile.attribute.ModuleMainClassAttribute;
 45 import java.lang.classfile.attribute.ModulePackagesAttribute;
 46 import java.lang.classfile.attribute.ModuleResolutionAttribute;
 47 import java.lang.classfile.attribute.ModuleTargetAttribute;
 48 import java.lang.classfile.attribute.NestHostAttribute;
 49 import java.lang.classfile.attribute.NestMembersAttribute;
 50 import java.lang.classfile.attribute.PermittedSubclassesAttribute;
 51 import java.lang.classfile.attribute.RecordAttribute;
 52 import java.lang.classfile.attribute.RuntimeInvisibleAnnotationsAttribute;
 53 import java.lang.classfile.attribute.RuntimeInvisibleParameterAnnotationsAttribute;
 54 import java.lang.classfile.attribute.RuntimeInvisibleTypeAnnotationsAttribute;
 55 import java.lang.classfile.attribute.RuntimeVisibleAnnotationsAttribute;
 56 import java.lang.classfile.attribute.RuntimeVisibleParameterAnnotationsAttribute;
 57 import java.lang.classfile.attribute.RuntimeVisibleTypeAnnotationsAttribute;
 58 import java.lang.classfile.attribute.SignatureAttribute;
 59 import java.lang.classfile.attribute.SourceDebugExtensionAttribute;
 60 import java.lang.classfile.attribute.SourceFileAttribute;
 61 import java.lang.classfile.attribute.SourceIDAttribute;
 62 import java.lang.classfile.attribute.StackMapTableAttribute;
 63 import java.lang.classfile.attribute.SyntheticAttribute;
 64 import java.lang.classfile.attribute.UnknownAttribute;
 65 import jdk.internal.classfile.impl.BoundAttribute;
 66 import jdk.internal.classfile.impl.UnboundAttribute;
 67 import jdk.internal.javac.PreviewFeature;
 68 
 69 /**
 70  * Models a classfile attribute {@jvms 4.7}.  Many, though not all, subtypes of
 71  * {@linkplain Attribute} will implement {@link ClassElement}, {@link
 72  * MethodElement}, {@link FieldElement}, or {@link CodeElement}; attributes that
 73  * are also elements will be delivered when traversing the elements of the
 74  * corresponding model type. Additionally, all attributes are accessible
 75  * directly from the corresponding model type through {@link
 76  * AttributedElement#findAttribute(AttributeMapper)}.
 77  * @param <A> the attribute type
 78  *
 79  * @sealedGraph
 80  * @since 22
 81  */
 82 @PreviewFeature(feature = PreviewFeature.Feature.CLASSFILE_API)
 83 public sealed interface Attribute<A extends Attribute<A>>
 84         extends WritableElement<A>
 85         permits AnnotationDefaultAttribute, BootstrapMethodsAttribute,
 86                 CharacterRangeTableAttribute, CodeAttribute, CompilationIDAttribute,
 87                 ConstantValueAttribute, DeprecatedAttribute, EnclosingMethodAttribute,
 88                 ExceptionsAttribute, InnerClassesAttribute, LineNumberTableAttribute,
 89                 LoadableDescriptorsAttribute, LocalVariableTableAttribute, LocalVariableTypeTableAttribute,
 90                 MethodParametersAttribute, ModuleAttribute, ModuleHashesAttribute,
 91                 ModuleMainClassAttribute, ModulePackagesAttribute, ModuleResolutionAttribute,
 92                 ModuleTargetAttribute, NestHostAttribute, NestMembersAttribute,
 93                 PermittedSubclassesAttribute,
 94                 RecordAttribute, RuntimeInvisibleAnnotationsAttribute,
 95                 RuntimeInvisibleParameterAnnotationsAttribute, RuntimeInvisibleTypeAnnotationsAttribute,
 96                 RuntimeVisibleAnnotationsAttribute, RuntimeVisibleParameterAnnotationsAttribute,
 97                 RuntimeVisibleTypeAnnotationsAttribute, SignatureAttribute,
 98                 SourceDebugExtensionAttribute, SourceFileAttribute, SourceIDAttribute,
 99                 StackMapTableAttribute, SyntheticAttribute,
100                 UnknownAttribute, BoundAttribute, UnboundAttribute, CustomAttribute {
101     /**
102      * {@return the name of the attribute}
103      */
104     String attributeName();
105 
106     /**
107      * {@return the {@link AttributeMapper} associated with this attribute}
108      */
109     AttributeMapper<A> attributeMapper();
110 }