1 /*
   2  * Copyright (c) 2017, 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 
  26 package com.sun.tools.classfile;
  27 
  28 import java.io.IOException;
  29 import java.util.stream.IntStream;
  30 
  31 import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;
  32 
  33 public class PermittedSubtypes_attribute extends Attribute {
  34 
  35     public int[] subtypes;
  36 
  37     PermittedSubtypes_attribute(ClassReader cr, int name_index, int length) throws IOException {
  38         super(name_index, length);
  39         int number_of_classes = cr.readUnsignedShort();
  40         subtypes = new int[number_of_classes];
  41         for (int i = 0; i < number_of_classes; i++)
  42             subtypes[i] = cr.readUnsignedShort();
  43     }
  44 
  45     public PermittedSubtypes_attribute(int name_index, int[] subtypes) {
  46         super(name_index, 2);
  47         this.subtypes = subtypes;
  48     }
  49 
  50     public CONSTANT_Class_info[] getSubtypes(ConstantPool constant_pool) throws ConstantPoolException {
  51         return IntStream.of(subtypes)
  52                 .mapToObj(i -> {
  53                     try {
  54                         return constant_pool.getClassInfo(i);
  55                     } catch (ConstantPoolException ex) {
  56                         throw new AssertionError(ex);
  57                     }
  58                 }).toArray(CONSTANT_Class_info[]::new);
  59     }
  60 
  61     @Override
  62     public <R, D> R accept(Visitor<R, D> visitor, D data) {
  63         return visitor.visitPermittedSubtypes(this, data);
  64     }
  65 }