content: /*
   * Copyright (c) 2007, 2009, 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;
  
  /**
   * See JVMS, section 4.8.16.
   *
   *  <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 class Annotation {
      static class InvalidAnnotation extends AttributeException {
          private static final long serialVersionUID = -4620480740735772708L;
          InvalidAnnotation(String msg) {
              super(msg);
          }
      }
  
      Annotation(ClassReader cr) throws IOException, InvalidAnnotation {
          type_index = cr.readUnsignedShort();
          num_element_value_pairs = cr.readUnsignedShort();
          element_value_pairs = new element_value_pair[num_element_value_pairs];
          for (int i = 0; i < element_value_pairs.length; i++)
              element_value_pairs[i] = new element_value_pair(cr);
      }
  
      public Annotation(ConstantPool constant_pool,
              int type_index,
              element_value_pair[] element_value_pairs) {
          this.type_index = type_index;
          num_element_value_pairs = element_value_pairs.length;
          this.element_value_pairs = element_value_pairs;
      }
  
      public int length() {
          int n = 2 /*type_index*/ + 2 /*num_element_value_pairs*/;
          for (element_value_pair pair: element_value_pairs)
              n += pair.length();
          return n;
      }
  
      public final int type_index;
      public final int num_element_value_pairs;
      public final element_value_pair element_value_pairs[];
  
      /**
       * See JVMS, section 4.8.16.1.
       */
      public static abstract class element_value {
          public static element_value read(ClassReader cr)
                  throws IOException, InvalidAnnotation {
              int tag = cr.readUnsignedByte();
              switch (tag) {
              case 'B':
              case 'C':
              case 'D':
              case 'F':
              case 'I':
              case 'J':
              case 'S':
              case 'Z':
              case 's':
                  return new Primitive_element_value(cr, tag);
  
              case 'e':
                  return new Enum_element_value(cr, tag);
  
              case 'c':
                  return new Class_element_value(cr, tag);
  
              case '@':
                  return new Annotation_element_value(cr, tag);
  
              case '[':
                  return new Array_element_value(cr, tag);
  
              default:
                  throw new InvalidAnnotation("unrecognized tag: " + tag);
              }
          }
  
          protected element_value(int tag) {
              this.tag = tag;
          }
  
          public abstract int length();
  
          public abstract <R,P> R accept(Visitor<R,P> visitor, P p);
  
          public interface Visitor<R,P> {
              R visitPrimitive(Primitive_element_value ev, P p);
              R visitEnum(Enum_element_value ev, P p);
              R visitClass(Class_element_value ev, P p);
              R visitAnnotation(Annotation_element_value ev, P p);
              R visitArray(Array_element_value ev, P p);
          }
  
          public final int tag;
      }
  
      public static class Primitive_element_value extends element_value {
          Primitive_element_value(ClassReader cr, int tag) throws IOException {
              super(tag);
              const_value_index = cr.readUnsignedShort();
          }
  
          public Primitive_element_value(int const_value_index, int tag) {
              super(tag);
              this.const_value_index = const_value_index;
          }
  
          @Override
          public int length() {
              return 2;
          }
  
          public <R,P> R accept(Visitor<R,P> visitor, P p) {
              return visitor.visitPrimitive(this, p);
          }
  
          public final int const_value_index;
  
      }
  
      public static class Enum_element_value extends element_value {
          Enum_element_value(ClassReader cr, int tag) throws IOException {
              super(tag);
              type_name_index = cr.readUnsignedShort();
              const_name_index = cr.readUnsignedShort();
          }
  
          public Enum_element_value(int type_name_index, int const_name_index, int tag) {
              super(tag);
              this.type_name_index = type_name_index;
              this.const_name_index = const_name_index;
          }
  
          @Override
          public int length() {
              return 4;
          }
  
          public <R,P> R accept(Visitor<R,P> visitor, P p) {
              return visitor.visitEnum(this, p);
          }
  
          public final int type_name_index;
          public final int const_name_index;
      }
  
      public static class Class_element_value extends element_value {
          Class_element_value(ClassReader cr, int tag) throws IOException {
              super(tag);
              class_info_index = cr.readUnsignedShort();
          }
  
          public Class_element_value(int class_info_index, int tag) {
              super(tag);
              this.class_info_index = class_info_index;
          }
  
          @Override
          public int length() {
              return 2;
          }
  
          public <R,P> R accept(Visitor<R,P> visitor, P p) {
              return visitor.visitClass(this, p);
          }
  
          public final int class_info_index;
      }
  
      public static class Annotation_element_value extends element_value {
          Annotation_element_value(ClassReader cr, int tag)
                  throws IOException, InvalidAnnotation {
              super(tag);
              annotation_value = new Annotation(cr);
          }
  
          public Annotation_element_value(Annotation annotation_value, int tag) {
              super(tag);
              this.annotation_value = annotation_value;
          }
  
          @Override
          public int length() {
              return annotation_value.length();
          }
  
          public <R,P> R accept(Visitor<R,P> visitor, P p) {
              return visitor.visitAnnotation(this, p);
          }
  
          public final Annotation annotation_value;
      }
  
      public static class Array_element_value extends element_value {
          Array_element_value(ClassReader cr, int tag)
                  throws IOException, InvalidAnnotation {
              super(tag);
              num_values = cr.readUnsignedShort();
              values = new element_value[num_values];
              for (int i = 0; i < values.length; i++)
                  values[i] = element_value.read(cr);
          }
  
          public Array_element_value(element_value[] values, int tag) {
              super(tag);
              this.num_values = values.length;
              this.values = values;
          }
  
          @Override
          public int length() {
              int n = 2;
              for (int i = 0; i < values.length; i++)
                  n += values[i].length();
              return n;
          }
  
          public <R,P> R accept(Visitor<R,P> visitor, P p) {
              return visitor.visitArray(this, p);
          }
  
          public final int num_values;
          public final element_value[] values;
      }
  
      public static class element_value_pair {
          element_value_pair(ClassReader cr)
                  throws IOException, InvalidAnnotation {
              element_name_index = cr.readUnsignedShort();
              value = element_value.read(cr);
          }
  
          public element_value_pair(int element_name_index, element_value value) {
              this.element_name_index = element_name_index;
              this.value = value;
          }
  
          public int length() {
              return 2 + value.length();
          }
  
          public final int element_name_index;
          public final element_value value;
      }
  }
  