1 /*
 2  * Copyright (c) 2018, 2020, 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.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 package org.openjdk.asmtools.jdis;
24 
25 import java.io.DataInputStream;
26 import java.io.IOException;
27 
28 /**
29  * Base class of the "classes[]" data of attributes
30  * <p>
31  * JEP 181 (Nest-based Access Control): class file 55.0
32  * NestMembers_attribute {
33  * u2 attribute_name_index;
34  * u4 attribute_length;
35  * u2 number_of_classes;
36  * u2 classes[number_of_classes];
37  * }
38  * <p>
39  * JEP 360 (Sealed types): class file 59.65535
40  * PermittedSubclasses_attribute {
41  * u2 attribute_name_index;
42  * u4 attribute_length;
43  * u2 number_of_classes;
44  * u2 classes[number_of_classes];
45  * }
46  * </p>
47  */
48 public class ClassArrayData extends Indenter {
49     String name;
50     ClassData cls;
51     int[] classes;
52     private Options options = Options.OptionObject();
53 
54     protected ClassArrayData(ClassData cls, String attrName) {
55         this.cls = cls;
56         this.name = attrName;
57     }
58 
59     public ClassArrayData read(DataInputStream in, int attribute_length) throws IOException, ClassFormatError {
60         int number_of_classes = in.readUnsignedShort();
61         if (attribute_length != 2 + number_of_classes * 2) {
62             throw new ClassFormatError(name + "_attribute: Invalid attribute length");
63         }
64         classes = new int[number_of_classes];
65         for (int i = 0; i < number_of_classes; i++) {
66             classes[i] = in.readUnsignedShort();
67         }
68         return this;
69     }
70 
71     public void print() {
72         String indexes = "";
73         String names = "";
74         boolean pr_cpx = options.contains(Options.PR.CPX);
75         cls.out.print(getIndentString() + name + " ");
76         for (int i = 0; i < classes.length; i++) {
77             if (pr_cpx) {
78                 indexes += (indexes.isEmpty() ? "" : ", ") + "#" + classes[i];
79             }
80             names += (names.isEmpty() ? "" : ", ") + cls.pool.StringValue(classes[i]);
81         }
82         if (pr_cpx) {
83             cls.out.print(indexes + "; // ");
84         }
85         cls.out.print(names);
86         if (pr_cpx) {
87             cls.out.println();
88         } else {
89             cls.out.println(";");
90         }
91     }
92 
93 }