content: /*
   * Copyright (c) 2007, 2020, 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 openjdk.tools.classfile;
  
  import java.io.IOException;
  import java.lang.reflect.Constructor;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  
  public abstract class Attribute {
      public static final String AnnotationDefault        = "AnnotationDefault";
      public static final String BootstrapMethods         = "BootstrapMethods";
      public static final String CharacterRangeTable      = "CharacterRangeTable";
      public static final String Code                     = "Code";
      public static final String ConstantValue            = "ConstantValue";
      public static final String CompilationID            = "CompilationID";
      public static final String Deprecated               = "Deprecated";
      public static final String EnclosingMethod          = "EnclosingMethod";
      public static final String Exceptions               = "Exceptions";
      public static final String InnerClasses             = "InnerClasses";
      public static final String LineNumberTable          = "LineNumberTable";
      public static final String LocalVariableTable       = "LocalVariableTable";
      public static final String LocalVariableTypeTable   = "LocalVariableTypeTable";
      public static final String MethodParameters         = "MethodParameters";
      public static final String Module                   = "Module";
      public static final String ModuleHashes             = "ModuleHashes";
      public static final String ModuleMainClass          = "ModuleMainClass";
      public static final String ModulePackages           = "ModulePackages";
      public static final String ModuleResolution         = "ModuleResolution";
      public static final String ModuleTarget             = "ModuleTarget";
      public static final String NestHost                 = "NestHost";
      public static final String NestMembers              = "NestMembers";
      public static final String Record                   = "Record";
      public static final String RuntimeVisibleAnnotations = "RuntimeVisibleAnnotations";
      public static final String RuntimeInvisibleAnnotations = "RuntimeInvisibleAnnotations";
      public static final String RuntimeVisibleParameterAnnotations = "RuntimeVisibleParameterAnnotations";
      public static final String RuntimeInvisibleParameterAnnotations = "RuntimeInvisibleParameterAnnotations";
      public static final String RuntimeVisibleTypeAnnotations = "RuntimeVisibleTypeAnnotations";
      public static final String RuntimeInvisibleTypeAnnotations = "RuntimeInvisibleTypeAnnotations";
      public static final String PermittedSubclasses      = "PermittedSubclasses";
      public static final String Signature                = "Signature";
      public static final String SourceDebugExtension     = "SourceDebugExtension";
      public static final String SourceFile               = "SourceFile";
      public static final String SourceID                 = "SourceID";
      public static final String StackMap                 = "StackMap";
      public static final String StackMapTable            = "StackMapTable";
      public static final String Synthetic                = "Synthetic";
  
      public static class Factory {
          public Factory() {
              // defer init of standardAttributeClasses until after options set up
          }
  
          public Attribute createAttribute(ClassReader cr, int name_index, byte[] data)
                  throws IOException {
              if (standardAttributes == null) {
                  init();
              }
  
              ConstantPool cp = cr.getConstantPool();
              String reasonForDefaultAttr;
              try {
                  String name = cp.getUTF8Value(name_index);
                  Class<? extends Attribute> attrClass = standardAttributes.get(name);
                  if (attrClass != null) {
                      try {
                          Class<?>[] constrArgTypes = {ClassReader.class, int.class, int.class};
                          Constructor<? extends Attribute> constr = attrClass.getDeclaredConstructor(constrArgTypes);
                          return constr.newInstance(cr, name_index, data.length);
                      } catch (Throwable t) {
                          reasonForDefaultAttr = t.toString();
                          // fall through and use DefaultAttribute
                          // t.printStackTrace();
                      }
                  } else {
                      reasonForDefaultAttr = "unknown attribute";
                  }
              } catch (ConstantPoolException e) {
                  reasonForDefaultAttr = e.toString();
                  // fall through and use DefaultAttribute
              }
              return new DefaultAttribute(cr, name_index, data, reasonForDefaultAttr);
          }
  
          protected void init() {
              standardAttributes = new HashMap<>();
              standardAttributes.put(AnnotationDefault, AnnotationDefault_attribute.class);
              standardAttributes.put(BootstrapMethods,  BootstrapMethods_attribute.class);
              standardAttributes.put(CharacterRangeTable, CharacterRangeTable_attribute.class);
              standardAttributes.put(Code,              Code_attribute.class);
              standardAttributes.put(CompilationID,     CompilationID_attribute.class);
              standardAttributes.put(ConstantValue,     ConstantValue_attribute.class);
              standardAttributes.put(Deprecated,        Deprecated_attribute.class);
              standardAttributes.put(EnclosingMethod,   EnclosingMethod_attribute.class);
              standardAttributes.put(Exceptions,        Exceptions_attribute.class);
              standardAttributes.put(InnerClasses,      InnerClasses_attribute.class);
              standardAttributes.put(LineNumberTable,   LineNumberTable_attribute.class);
              standardAttributes.put(LocalVariableTable, LocalVariableTable_attribute.class);
              standardAttributes.put(LocalVariableTypeTable, LocalVariableTypeTable_attribute.class);
              standardAttributes.put(MethodParameters,  MethodParameters_attribute.class);
              standardAttributes.put(Module,            Module_attribute.class);
              standardAttributes.put(ModuleHashes,      ModuleHashes_attribute.class);
              standardAttributes.put(ModuleMainClass,   ModuleMainClass_attribute.class);
              standardAttributes.put(ModulePackages,    ModulePackages_attribute.class);
              standardAttributes.put(ModuleResolution,  ModuleResolution_attribute.class);
              standardAttributes.put(ModuleTarget,      ModuleTarget_attribute.class);
              standardAttributes.put(NestHost, NestHost_attribute.class);
              standardAttributes.put(NestMembers, NestMembers_attribute.class);
              standardAttributes.put(Record, Record_attribute.class);
              standardAttributes.put(RuntimeInvisibleAnnotations, RuntimeInvisibleAnnotations_attribute.class);
              standardAttributes.put(RuntimeInvisibleParameterAnnotations, RuntimeInvisibleParameterAnnotations_attribute.class);
              standardAttributes.put(RuntimeVisibleAnnotations, RuntimeVisibleAnnotations_attribute.class);
              standardAttributes.put(RuntimeVisibleParameterAnnotations, RuntimeVisibleParameterAnnotations_attribute.class);
              standardAttributes.put(RuntimeVisibleTypeAnnotations, RuntimeVisibleTypeAnnotations_attribute.class);
              standardAttributes.put(RuntimeInvisibleTypeAnnotations, RuntimeInvisibleTypeAnnotations_attribute.class);
              standardAttributes.put(PermittedSubclasses, PermittedSubclasses_attribute.class);
              standardAttributes.put(Signature,         Signature_attribute.class);
              standardAttributes.put(SourceDebugExtension, SourceDebugExtension_attribute.class);
              standardAttributes.put(SourceFile,        SourceFile_attribute.class);
              standardAttributes.put(SourceID,          SourceID_attribute.class);
              standardAttributes.put(StackMap,          StackMap_attribute.class);
              standardAttributes.put(StackMapTable,     StackMapTable_attribute.class);
              standardAttributes.put(Synthetic,         Synthetic_attribute.class);
          }
  
          private Map<String,Class<? extends Attribute>> standardAttributes;
      }
  
      public static Attribute read(ClassReader cr) throws IOException {
          return cr.readAttribute();
      }
  
      protected Attribute(int name_index, int length) {
          attribute_name_index = name_index;
          attribute_length = length;
      }
  
      public String getName(ConstantPool constant_pool) throws ConstantPoolException {
          return constant_pool.getUTF8Value(attribute_name_index);
      }
  
      public abstract <R,D> R accept(Attribute.Visitor<R,D> visitor, D data);
  
      public int byteLength() {
          return 6 + attribute_length;
      }
  
      public final int attribute_name_index;
      public final int attribute_length;
  
  
      public interface Visitor<R,P> {
          R visitBootstrapMethods(BootstrapMethods_attribute attr, P p);
          R visitDefault(DefaultAttribute attr, P p);
          R visitAnnotationDefault(AnnotationDefault_attribute attr, P p);
          R visitCharacterRangeTable(CharacterRangeTable_attribute attr, P p);
          R visitCode(Code_attribute attr, P p);
          R visitCompilationID(CompilationID_attribute attr, P p);
          R visitConstantValue(ConstantValue_attribute attr, P p);
          R visitDeprecated(Deprecated_attribute attr, P p);
          R visitEnclosingMethod(EnclosingMethod_attribute attr, P p);
          R visitExceptions(Exceptions_attribute attr, P p);
          R visitInnerClasses(InnerClasses_attribute attr, P p);
          R visitLineNumberTable(LineNumberTable_attribute attr, P p);
          R visitLocalVariableTable(LocalVariableTable_attribute attr, P p);
          R visitLocalVariableTypeTable(LocalVariableTypeTable_attribute attr, P p);
          R visitMethodParameters(MethodParameters_attribute attr, P p);
          R visitModule(Module_attribute attr, P p);
          R visitModuleHashes(ModuleHashes_attribute attr, P p);
          R visitModuleMainClass(ModuleMainClass_attribute attr, P p);
          R visitModulePackages(ModulePackages_attribute attr, P p);
          R visitModuleResolution(ModuleResolution_attribute attr, P p);
          R visitModuleTarget(ModuleTarget_attribute attr, P p);
          R visitNestHost(NestHost_attribute attr, P p);
          R visitNestMembers(NestMembers_attribute attr, P p);
          R visitRecord(Record_attribute attr, P p);
          R visitRuntimeVisibleAnnotations(RuntimeVisibleAnnotations_attribute attr, P p);
          R visitRuntimeInvisibleAnnotations(RuntimeInvisibleAnnotations_attribute attr, P p);
          R visitRuntimeVisibleParameterAnnotations(RuntimeVisibleParameterAnnotations_attribute attr, P p);
          R visitRuntimeInvisibleParameterAnnotations(RuntimeInvisibleParameterAnnotations_attribute attr, P p);
          R visitRuntimeVisibleTypeAnnotations(RuntimeVisibleTypeAnnotations_attribute attr, P p);
          R visitRuntimeInvisibleTypeAnnotations(RuntimeInvisibleTypeAnnotations_attribute attr, P p);
          R visitPermittedSubclasses(PermittedSubclasses_attribute attr, P p);
          R visitSignature(Signature_attribute attr, P p);
          R visitSourceDebugExtension(SourceDebugExtension_attribute attr, P p);
          R visitSourceFile(SourceFile_attribute attr, P p);
          R visitSourceID(SourceID_attribute attr, P p);
          R visitStackMap(StackMap_attribute attr, P p);
          R visitStackMapTable(StackMapTable_attribute attr, P p);
          R visitSynthetic(Synthetic_attribute attr, P p);
      }
  }
  