1/*
2 * Copyright (c) 1999, 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
26package java.lang;
27
28import java.io.PrintStream;
29import java.util.Arrays;
30import java.util.List;
31import java.util.Optional;
32
33class VersionProps {
34
35
36    private static final String launcher_name =
37        "@@LAUNCHER_NAME@@";
38
39    private static final String java_version =
40        "@@VERSION_SHORT@@";
41
42    private static final String java_runtime_name =
43        "@@RUNTIME_NAME@@";
44
45    private static final String java_runtime_version =
46        "@@VERSION_STRING@@";
47
48    private static final String VERSION_NUMBER =
49        "@@VERSION_NUMBER@@";
50
51    private static final String VERSION_BUILD =
52        "@@VERSION_BUILD@@";
53
54    private static final String VERSION_PRE =
55        "@@VERSION_PRE@@";
56
57    private static final String VERSION_OPT =
58        "@@VERSION_OPT@@";
59
60    static {
61        init();
62    }
63
64    public static void init() {
65        System.setProperty("java.version", java_version);
66        System.setProperty("java.runtime.version", java_runtime_version);
67        System.setProperty("java.runtime.name", java_runtime_name);
68    }
69
70    private static int parseVersionNumber(String version, int prevIndex, int index) {
71        if (index - prevIndex > 1 &&
72            Character.digit(version.charAt(prevIndex), 10) <= 0)
73            throw new IllegalArgumentException("Leading zeros not supported (" +
74                    version.substring(prevIndex, index) + ")");
75        return Integer.parseInt(version, prevIndex, index, 10);
76    }
77
78    // This method is reflectively used by regression tests.
79    static List<Integer> parseVersionNumbers(String version) {
80        // Let's find the size of an array required to hold $VNUM components
81        int size = 0;
82        int prevIndex = 0;
83        do {
84            prevIndex = version.indexOf('.', prevIndex) + 1;
85            size++;
86        } while (prevIndex > 0);
87        Integer[] verNumbers = new Integer[size];
88
89        // Fill in the array with $VNUM components
90        int n = 0;
91        prevIndex = 0;
92        int index = version.indexOf('.');
93        while (index > -1) {
94            verNumbers[n] = parseVersionNumber(version, prevIndex, index);
95            prevIndex = index + 1; // Skip the period
96            index = version.indexOf('.', prevIndex);
97            n++;
98        }
99        verNumbers[n] = parseVersionNumber(version, prevIndex, version.length());
100
101        if (verNumbers[0] == 0 || verNumbers[n] == 0)
102            throw new IllegalArgumentException("Leading/trailing zeros not allowed (" +
103                    Arrays.toString(verNumbers) + ")");
104
105        return List.of(verNumbers);
106    }
107
108    static List<Integer> versionNumbers() {
109        return parseVersionNumbers(VERSION_NUMBER);
110    }
111
112    static Optional<String> pre() {
113        return optionalOf(VERSION_PRE);
114    }
115
116    static Optional<Integer> build() {
117        return VERSION_BUILD.isEmpty() ?
118                Optional.empty() :
119                Optional.of(Integer.parseInt(VERSION_BUILD));
120    }
121
122    static Optional<String> optional() {
123        return optionalOf(VERSION_OPT);
124    }
125
126    // Treat empty strings as value not being present
127    private static Optional<String> optionalOf(String value) {
128        if (!value.isEmpty()) {
129            return Optional.of(value);
130        } else {
131            return Optional.empty();
132        }
133    }
134
135    /**
136     * In case you were wondering this method is called by java -version.
137     */
138    public static void print(boolean err) {
139        print(err, false);
140    }
141
142    /**
143     * This is the same as print except that it adds an extra line-feed
144     * at the end, typically used by the -showversion in the launcher
145     */
146    public static void println(boolean err) {
147        print(err, true);
148    }
149
150    /**
151     * Print version info.
152     */
153    private static void print(boolean err, boolean newln) {
154        boolean isHeadless = false;
155        PrintStream ps = err ? System.err : System.out;
156
157        /* Report that we're running headless if the property is true */
158        String headless = System.getProperty("java.awt.headless");
159        if ( (headless != null) && (headless.equalsIgnoreCase("true")) ) {
160            isHeadless = true;
161        }
162
163        /* First line: platform version. */
164        if (err) {
165            ps.println(launcher_name + " version \"" + java_version + "\"");
166        } else {
167            /* Use a format more in line with GNU conventions */
168            ps.println(launcher_name + " " + java_version);
169        }
170
171        /* Second line: runtime version (ie, libraries). */
172        String jdk_debug_level = System.getProperty("jdk.debug", "release");
173        /* Debug level is not printed for "release" builds */
174        if ("release".equals(jdk_debug_level)) {
175            jdk_debug_level = "";
176        } else {
177            jdk_debug_level = jdk_debug_level + " ";
178        }
179
180        ps.print(java_runtime_name + " (" + jdk_debug_level + "build " + java_runtime_version);
181
182        ps.println(')');
183
184        /* Third line: JVM information. */
185        String java_vm_name    = System.getProperty("java.vm.name");
186        String java_vm_version = System.getProperty("java.vm.version");
187        String java_vm_info    = System.getProperty("java.vm.info");
188        ps.println(java_vm_name + " (" + jdk_debug_level + "build " + java_vm_version + ", " +
189                   java_vm_info + ")");
190    }
191
192}
193