org.springframework.core.JdkVersion Maven / Gradle / Ivy
/*
* Copyright 2002-2007 the original author or 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 org.springframework.core;
/**
* Internal helper class used to find the Java/JDK version
* that Spring is operating on, to allow for automatically
* adapting to the present platform's capabilities.
*
* Note that Spring does not support 1.2 or earlier JVMs.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rick Evans
*/
public abstract class JdkVersion {
/**
* Constant identifying the 1.3.x JVM (JDK 1.3).
*/
public static final int JAVA_13 = 0;
/**
* Constant identifying the 1.4.x JVM (J2SE 1.4).
*/
public static final int JAVA_14 = 1;
/**
* Constant identifying the 1.5 JVM (Java 5).
*/
public static final int JAVA_15 = 2;
/**
* Constant identifying the 1.6 JVM (Java 6).
*/
public static final int JAVA_16 = 3;
/**
* Constant identifying the 1.7 JVM.
*/
public static final int JAVA_17 = 4;
private static final String javaVersion;
private static final int majorJavaVersion;
static {
javaVersion = System.getProperty("java.version");
// version String should look like "1.4.2_10"
if (javaVersion.indexOf("1.7.") != -1) {
majorJavaVersion = JAVA_17;
}
else if (javaVersion.indexOf("1.6.") != -1) {
majorJavaVersion = JAVA_16;
}
else if (javaVersion.indexOf("1.5.") != -1) {
majorJavaVersion = JAVA_15;
}
else if (javaVersion.indexOf("1.4.") != -1) {
majorJavaVersion = JAVA_14;
}
else {
// else leave 1.3 as default (it's either 1.3 or unknown)
majorJavaVersion = JAVA_13;
}
}
/**
* Return the full Java version string, as returned by
* System.getProperty("java.version").
* @return the full Java version string
* @see System#getProperty(String)
*/
public static String getJavaVersion() {
return javaVersion;
}
/**
* Get the major version code. This means we can do things like
* if (getMajorJavaVersion() < JAVA_14).
* @return a code comparable to the JAVA_XX codes in this class
* @see #JAVA_13
* @see #JAVA_14
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static int getMajorJavaVersion() {
return majorJavaVersion;
}
/**
* Convenience method to determine if the current JVM is at least Java 1.4.
* @return true if the current JVM is at least Java 1.4
* @see #getMajorJavaVersion()
* @see #JAVA_14
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static boolean isAtLeastJava14() {
return getMajorJavaVersion() >= JAVA_14;
}
/**
* Convenience method to determine if the current JVM is at least
* Java 1.5 (Java 5).
* @return true if the current JVM is at least Java 1.5
* @see #getMajorJavaVersion()
* @see #JAVA_15
* @see #JAVA_16
* @see #JAVA_17
*/
public static boolean isAtLeastJava15() {
return getMajorJavaVersion() >= JAVA_15;
}
}