1 /*
   2  * Copyright (c) 2018, 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 com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;
  29 
  30 import java.io.IOException;
  31 import java.util.stream.IntStream;
  32 
  33 /**
  34  *  <p><b>This is NOT part of any supported API.
  35  *  If you write code that depends on this, you do so at your own risk.
  36  *  This code and its internal interfaces are subject to change or
  37  *  deletion without notice.</b>
  38  */
  39 public class NestMembers_attribute extends Attribute {
  40     NestMembers_attribute(ClassReader cr, int name_index, int length) throws IOException {
  41         super(name_index, length);
  42         int len = cr.readUnsignedShort();
  43         members_indexes = new int[len];
  44         for (int i = 0 ; i < len ; i++) {
  45             members_indexes[i] = cr.readUnsignedShort();
  46         }
  47     }
  48 
  49     public NestMembers_attribute(int name_index, int[] members_indexes) {
  50         super(name_index, 2);
  51         this.members_indexes = members_indexes;
  52     }
  53 
  54     public CONSTANT_Class_info[] getChildren(ConstantPool constant_pool) throws ConstantPoolException {
  55         return IntStream.of(members_indexes)
  56                 .mapToObj(i -> {
  57                     try {
  58                         return constant_pool.getClassInfo(i);
  59                     } catch (ConstantPoolException ex) {
  60                         throw new AssertionError(ex);
  61                     }
  62                 }).toArray(CONSTANT_Class_info[]::new);
  63     }
  64 
  65     public <R, D> R accept(Visitor<R, D> visitor, D data) {
  66         return visitor.visitNestMembers(this, data);
  67     }
  68 
  69     public final int[] members_indexes;
  70 }