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/*
* Copyright (C) 2017 The Gson authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gson.internal;
/**
* Utility to check the major Java version of the current JVM.
*/
public final class JavaVersion {
// Oracle defines naming conventions at http://www.oracle.com/technetwork/java/javase/versioning-naming-139433.html
// However, many alternate implementations differ. For example, Debian used 9-debian as the version string
private static final int majorJavaVersion = determineMajorJavaVersion();
private static int determineMajorJavaVersion() {
String javaVersion = System.getProperty("java.version");
return getMajorJavaVersion(javaVersion);
}
// Visible for testing only
static int getMajorJavaVersion(String javaVersion) {
int version = parseDotted(javaVersion);
if (version == -1) {
version = extractBeginningInt(javaVersion);
}
if (version == -1) {
return 6; // Choose minimum supported JDK version as default
}
return version;
}
// Parses both legacy 1.8 style and newer 9.0.4 style
private static int parseDotted(String javaVersion) {
try {
String[] parts = javaVersion.split("[._]");
int firstVer = Integer.parseInt(parts[0]);
if (firstVer == 1 && parts.length > 1) {
return Integer.parseInt(parts[1]);
} else {
return firstVer;
}
} catch (NumberFormatException e) {
return -1;
}
}
private static int extractBeginningInt(String javaVersion) {
try {
StringBuilder num = new StringBuilder();
for (int i = 0; i < javaVersion.length(); ++i) {
char c = javaVersion.charAt(i);
if (Character.isDigit(c)) {
num.append(c);
} else {
break;
}
}
return Integer.parseInt(num.toString());
} catch (NumberFormatException e) {
return -1;
}
}
/**
* @return the major Java version, i.e. '8' for Java 1.8, '9' for Java 9 etc.
*/
public static int getMajorJavaVersion() {
return majorJavaVersion;
}
/**
* @return {@code true} if the application is running on Java 9 or later; and {@code false} otherwise.
*/
public static boolean isJava9OrLater() {
return majorJavaVersion >= 9;
}
private JavaVersion() { }
}