com.github.shepherdviolet.glacimon.java.misc.JavaPlatformUtils Maven / Gradle / Ivy
/*
* Copyright (C) 2022-2022 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/glacimon
* Email: [email protected]
*/
package com.github.shepherdviolet.glacimon.java.misc;
import java.lang.reflect.Field;
/**
* JAVA运行环境信息
*
* @author shepherdviolet
*/
public class JavaPlatformUtils {
public enum Platform{
/**
* Java HotSpot
*/
HOTSPOT("Java HotSpot"),
/**
* OpenJDK
*/
OPENJDK("OpenJDK"),
/**
* Dalvik
*/
DALVIK("Dalvik"),
/**
* EBA
*/
JROCKIT("BEA"),
/**
* GNU libgcj
*/
GNU("GNU libgcj"),
/**
* PERC
*/
PERC("PERC"),
/**
* UNKNOWN
*/
UNKNOWN("UNKNOWN");
private String prefix;
Platform(String prefix) {
this.prefix = prefix;
}
public String getPrefix() {
return prefix;
}
}
public static final String VM_NAME = System.getProperty("java.vm.name");
public static final String VM_VERSION = System.getProperty("java.vm.version");
public static final String VM_VENDOR = System.getProperty("java.vm.vendor");
public static final String RUNTIME_VERSION = System.getProperty("java.runtime.version");
public static final String VM_INFO = System.getProperty("java.vm.info");
public static final String SPECIFICATION_VERSION = System.getProperty("java.specification.version");
/**
* platform
*/
public static final Platform PLATFORM = getPlatform();
/**
* Android version. Will be -1 for none android platform, and -2 for exception
*/
public static final int ANDROID_VERSION = getAndroidVersion();
/**
* Flag telling if this version of Android is based on the OpenJDK
*/
public static final boolean ANDROID_IS_OPEN_JDK = getAndroidIsOpenJDK();
public static final String GAE_VERSION = getGaeRuntimeVersion();
public static final boolean GAE_IS_GOOGLE_APP_ENGINE = getGaeIsGoogleAppEngine();
private static Platform getPlatform(){
if (VM_NAME.startsWith(Platform.HOTSPOT.getPrefix())){
return Platform.HOTSPOT;
}
if (VM_NAME.startsWith(Platform.OPENJDK.getPrefix())){
return Platform.OPENJDK;
}
if (VM_NAME.startsWith(Platform.DALVIK.getPrefix())){
return Platform.DALVIK;
}
if (VM_NAME.startsWith(Platform.JROCKIT.getPrefix())){
return Platform.JROCKIT;
}
if (VM_NAME.startsWith(Platform.GNU.getPrefix())){
return Platform.GNU;
}
if (VM_NAME.startsWith(Platform.PERC.getPrefix())){
return Platform.PERC;
}
return Platform.UNKNOWN;
}
private static int getAndroidVersion() {
if (PLATFORM != Platform.DALVIK) {
return -1;
}
Class clazz;
try {
clazz = Class.forName("android.os.Build$VERSION");
} catch (ClassNotFoundException e) {
e.printStackTrace();
return -2;
}
Field field;
try {
field = clazz.getField("SDK_INT");
} catch (NoSuchFieldException e) {
return getOldAndroidVersion(clazz);
}
int version;
try {
version = (Integer) field.get(null);
} catch (IllegalAccessException e) {
e.printStackTrace();
return -2;
}
return version;
}
private static int getOldAndroidVersion(Class versionClass) {
Field field;
try {
field = versionClass.getField("SDK");
} catch (NoSuchFieldException e) {
e.printStackTrace();
return -2;
}
String version;
try {
version = (String) field.get(null);
} catch (IllegalAccessException e) {
e.printStackTrace();
return -2;
}
return Integer.parseInt(version);
}
private static boolean getAndroidIsOpenJDK() {
if(ANDROID_VERSION < 0) {
return false;
}
String bootClasspath = System.getProperty("java.boot.class.path");
return bootClasspath != null && bootClasspath.toLowerCase().contains("core-oj.jar");
}
private static boolean getGaeIsGoogleAppEngine() {
return GAE_VERSION != null;
}
private static String getGaeRuntimeVersion() {
return System.getProperty("com.google.appengine.runtime.version");
}
}