1 /*
2 * Copyright (c) 2014, 2025, 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 jdk.tools.jlink.internal;
27
28 import jdk.internal.jimage.ImageLocation;
29 import jdk.internal.jimage.ImageStream;
30 import jdk.internal.jimage.ImageStringsReader;
31
32 public final class ImageLocationWriter extends ImageLocation {
33 private int locationOffset;
34
35 private ImageLocationWriter(ImageStringsWriter strings) {
36 super(new long[ATTRIBUTE_COUNT], strings);
37 }
38
39 void writeTo(ImageStream stream) {
40 byte[] bytes = ImageLocation.compress(attributes);
41 locationOffset = stream.getPosition();
42 stream.put(bytes, 0, bytes.length);
43 }
44
45 private ImageLocationWriter addAttribute(int kind, long value) {
46 assert ATTRIBUTE_END < kind &&
47 kind < ATTRIBUTE_COUNT : "Invalid attribute kind";
48 attributes[kind] = value;
49 return this;
50 }
51
52 private ImageLocationWriter addAttribute(int kind, String value) {
53 return addAttribute(kind, strings.add(value));
54 }
55
56 static ImageLocationWriter newLocation(
57 String fullName,
58 ImageStringsWriter strings,
59 long contentOffset,
60 long compressedSize,
61 long uncompressedSize,
62 int previewFlags) {
63 String moduleName = "";
64 String parentName = "";
65 String baseName;
66 String extensionName = "";
67
68 if (fullName.startsWith("/modules/")) {
69 moduleName = "modules";
70 baseName = fullName.substring("/modules/".length());
71 } else if ( fullName.startsWith("/packages/")) {
72 moduleName = "packages";
73 baseName = fullName.substring("/packages/".length());
74 } else {
75 int offset = fullName.indexOf('/', 1);
76 if (fullName.length() >= 2 && fullName.charAt(0) == '/' && offset != -1) {
77 moduleName = fullName.substring(1, offset);
78 fullName = fullName.substring(offset + 1);
79 }
80
81 offset = fullName.lastIndexOf('/');
82 if (1 < offset) {
83 parentName = fullName.substring(0, offset);
84 fullName = fullName.substring(offset + 1);
85 }
86
87 offset = fullName.lastIndexOf('.');
88 if (offset != -1) {
89 baseName = fullName.substring(0, offset);
90 extensionName = fullName.substring(offset + 1);
91 } else {
92 baseName = fullName;
93 }
94 }
95
96 return new ImageLocationWriter(strings)
97 .addAttribute(ATTRIBUTE_MODULE, moduleName)
98 .addAttribute(ATTRIBUTE_PARENT, parentName)
99 .addAttribute(ATTRIBUTE_BASE, baseName)
100 .addAttribute(ATTRIBUTE_EXTENSION, extensionName)
101 .addAttribute(ATTRIBUTE_OFFSET, contentOffset)
102 .addAttribute(ATTRIBUTE_COMPRESSED, compressedSize)
103 .addAttribute(ATTRIBUTE_UNCOMPRESSED, uncompressedSize)
104 .addAttribute(ATTRIBUTE_PREVIEW_FLAGS, previewFlags);
105 }
106
107 @Override
108 public int hashCode() {
109 return hashCode(ImageStringsReader.HASH_MULTIPLIER);
110 }
111
112 int hashCode(int seed) {
113 int hash = seed;
114
115 if (getModuleOffset() != 0) {
116 hash = ImageStringsReader.unmaskedHashCode("/", hash);
117 hash = ImageStringsReader.unmaskedHashCode(getModule(), hash);
118 hash = ImageStringsReader.unmaskedHashCode("/", hash);
119 }
120
121 if (getParentOffset() != 0) {
122 hash = ImageStringsReader.unmaskedHashCode(getParent(), hash);
123 hash = ImageStringsReader.unmaskedHashCode("/", hash);
124 }
125
126 hash = ImageStringsReader.unmaskedHashCode(getBase(), hash);
127
128 if (getExtensionOffset() != 0) {
129 hash = ImageStringsReader.unmaskedHashCode(".", hash);
130 hash = ImageStringsReader.unmaskedHashCode(getExtension(), hash);
131 }
132
133 return hash & ImageStringsReader.POSITIVE_MASK;
134 }
135
136 @Override
137 public boolean equals(Object obj) {
138 if (this == obj) {
139 return true;
140 }
141
142 if (!(obj instanceof ImageLocationWriter)) {
143 return false;
144 }
145
146 ImageLocationWriter other = (ImageLocationWriter) obj;
147
148 return getModuleOffset() == other.getModuleOffset() &&
149 getParentOffset() == other.getParentOffset() &&
150 getBaseOffset() == other.getBaseOffset() &&
151 getExtensionOffset() == other.getExtensionOffset();
152 }
153
154 int getLocationOffset() {
155 return locationOffset;
156 }
157 }