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* Fixed google#1310 Also renamed VersionUtils to more readable abstraction JavaVersion Added support for debian naming convention Using min supported version (6) as the default if JDK version can't be figured out * Moved JavaVersion to an internal package
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gson/src/main/java/com/google/gson/internal/JavaVersion.java
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|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package com.google.gson.internal; | ||
|
|
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| /** | ||
| * 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 | ||
|
|
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| private static final int majorJavaVersion = determineMajorJavaVersion(); | ||
|
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| private static int determineMajorJavaVersion() { | ||
| String javaVersion = System.getProperty("java.version"); | ||
| return getMajorJavaVersion(javaVersion); | ||
| } | ||
|
|
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| // 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; | ||
| } | ||
|
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| // 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; | ||
| } | ||
| } | ||
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| 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; | ||
| } | ||
| } | ||
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| /** | ||
| * @return the major Java version, i.e. '8' for Java 1.8, '9' for Java 9 etc. | ||
| */ | ||
| public static int getMajorJavaVersion() { | ||
| return majorJavaVersion; | ||
| } | ||
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| /** | ||
| * @return {@code true} if the application is running on Java 9 or later; and {@code false} otherwise. | ||
| */ | ||
| public static boolean isJava9OrLater() { | ||
| return majorJavaVersion >= 9; | ||
| } | ||
| } |
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