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Updated OS.getJavaVersion method to work for java <=9 (via original parsing) and java >9 (via JEP 223)

This commit is contained in:
nathan 2018-08-08 00:13:35 +02:00
parent 134678c369
commit c832edc3a0
1 changed files with 28 additions and 24 deletions
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52
src/dorkbox/util/OS.java
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@ -25,7 +25,6 @@ import java.util.Locale;
import java.util.TimeZone;
@SuppressWarnings({"unused", "WeakerAccess"})
public
class OS {
public static final String LINE_SEPARATOR = System.getProperty("line.separator");
@ -39,14 +38,13 @@ class OS {
public static final File TEMP_DIR = new File(System.getProperty("java.io.tmpdir"));
/**
* The currently running java version as a NUMBER. For example, "Java version 1.7u45", and converts it into 7
* The currently running MAJOR java version as a NUMBER. For example, "Java version 1.7u45", and converts it into 7, uses JEP 223 for java > 9
*/
public static final int javaVersion = _getJavaVersion();
private static final OSType osType;
private static final String originalTimeZone = TimeZone.getDefault()
.getID();
private static final String originalTimeZone = TimeZone.getDefault().getID();
static {
/**
@ -259,36 +257,42 @@ class OS {
/**
* Gets the currently running java version as a NUMBER. For example, "Java version 1.7u45", and converts it into 7
* Gets the currently running MAJOR java version as a NUMBER. For example, "Java version 1.7u45", and converts it into 7, uses JEP 223 for java > 9
*/
private static
int _getJavaVersion() {
String fullJavaVersion = System.getProperty("java.version");
char versionChar;
if (fullJavaVersion.startsWith("1.")) {
versionChar = fullJavaVersion.charAt(2);
switch (fullJavaVersion.charAt(2)) {
case '4':
return 4;
case '5':
return 5;
case '6':
return 6;
case '7':
return 7;
case '8':
return 8;
case '9':
return 9;
}
}
else {
versionChar = fullJavaVersion.charAt(0);
// We are >= java 10, use JEP 223 to get the version (early releases of 9 might not have JEP 223, so 10 is guaranteed to have it)
fullJavaVersion = System.getProperty("java.specification.version", "10");
try {
// it will ALWAYS be the major release version as an integer. See http://openjdk.java.net/jeps/223
return Integer.parseInt(fullJavaVersion);
} catch (Exception ignored) {
}
}
switch (versionChar) {
case '4':
return 4;
case '5':
return 5;
case '6':
return 6;
case '7':
return 7;
case '8':
return 8;
case '9':
return 9;
default:
return -1;
}
// the last valid guess we have, since the current Java implementation, whatever it is, decided not to cooperate with JEP 223.
return 10;
}
/**