ModuleHashes_attribute.java revision 3792:d516975e8110 
1/*
2 * Copyright (c) 2015, 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
26package com.sun.tools.classfile;
27
28import java.io.IOException;
29
30/**
31 * See JVMS, section 4.8.15.
32 *
33 *  <p><b>This is NOT part of any supported API.
34 *  If you write code that depends on this, you do so at your own risk.
35 *  This code and its internal interfaces are subject to change or
36 *  deletion without notice.</b>
37 */
38public class ModuleHashes_attribute extends Attribute {
39    ModuleHashes_attribute(ClassReader cr, int name_index, int length) throws IOException {
40        super(name_index, length);
41        algorithm_index = cr.readUnsignedShort();
42        hashes_table_length = cr.readUnsignedShort();
43        hashes_table = new Entry[hashes_table_length];
44        for (int i = 0; i < hashes_table_length; i++)
45            hashes_table[i] = new Entry(cr);
46    }
47
48    public ModuleHashes_attribute(ConstantPool constant_pool, int algorithm_index, Entry[] hashes_table)
49            throws ConstantPoolException {
50        this(constant_pool.getUTF8Index(Attribute.ModuleHashes), algorithm_index, hashes_table);
51    }
52
53    public ModuleHashes_attribute(int name_index, int algorithm_index, Entry[] hashes_table) {
54        super(name_index, 2 + 2 + length(hashes_table));
55        this.algorithm_index = algorithm_index;
56        this.hashes_table_length = hashes_table.length;
57        this.hashes_table = hashes_table;
58    }
59
60    @Override
61    public <R, D> R accept(Visitor<R, D> visitor, D data) {
62        return visitor.visitModuleHashes(this, data);
63    }
64
65    private static int length(Entry[] hashes_table) {
66        int len = 0;
67        for (Entry e: hashes_table) {
68            len += e.length();
69        }
70        return len;
71    }
72
73    public final int algorithm_index;
74    public final int hashes_table_length;
75    public final Entry[] hashes_table;
76
77    public static class Entry {
78        Entry(ClassReader cr) throws IOException {
79            module_name_index = cr.readUnsignedShort();
80            int hash_length = cr.readUnsignedShort();
81            hash = new byte[hash_length];
82            for (int i=0; i<hash_length; i++) {
83                hash[i] = (byte) cr.readUnsignedByte();
84            }
85        }
86
87        public int length() {
88            return 4 + hash.length;
89        }
90
91        public final int module_name_index;
92        public final byte[] hash;
93    }
94
95}
96