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package com.day.util;
/**
* The JavaVersion class is a helper class to handle various
* Java version strings and query about the version of the Java VM the
* application is running.
*
* The version information provided is based on the Java Runtime of the currently
* running Virtual Machine.
*
* This is a utility class, which cannot be instantiated.
*
* @author fmeschbe
* @version $Revision: 1.4 $, $Date: 2004-11-19 17:34:44 +0100 (Fri, 19 Nov 2004) $
* Audience wad
* @since hawk
*/
public class JavaVersion {
/**
* This object is used to check for specification version compliance. The
* nice thing about the Package class is, that it contains a method to
* correctly check version names like 1.3.1, etc.
*/
private static final Package specPackage;
static {
// Get the package from the class loader(s)
// See bug 10745 for details.
specPackage = new ClassLoader() {
Package createPackage() {
return definePackage("dummy.package",
System.getProperty("java.specification.name"),
System.getProperty("java.specification.version"),
System.getProperty("java.specification.vendor"),
"Java Runtime Environment",
System.getProperty("java.version"),
System.getProperty("java.vendor"), null);
}
}.createPackage();
}
/** The specification version String for Java 1.3 */
private static final String specVersion13 = "1.3";
/** The specification version String for Java 1.4 */
private static final String specVersion14 = "1.4";
/** The specification version String for Java 1.5 */
private static final String specVersion15 = "1.5";
/** Private constructor prevents instantion */
private JavaVersion() {}
/**
* Returns the implementation version of the current Java Runtime library.
* E.g. "1.4.2_04"
* @return the version
*/
public static String getVersion() {
return specPackage.getImplementationVersion();
}
/**
* Returns the specification version of the current Java Runtime library.
* E.g. "1.4"
* @return the version
*/
public static String getSpecificationVersion() {
return specPackage.getSpecificationVersion();
}
/**
* Returns true if the specification version of the current
* Java Runtime library is 1.3. This is a convenience method
* completely equivalent to
* {@link #isSpecificationVersion(java.lang.String) isSpecificationVersion("1.3")}.
* @return if it is the version
*/
public static boolean is13() {
return isSpecificationVersion(specVersion13);
}
/**
* Returns true if the specification version of the current
* Java Runtime library is 1.4. This is a convenience method
* completely equivalent to
* {@link #isSpecificationVersion(java.lang.String) isSpecificationVersion("1.4")}.
* @return if it is the version
*/
public static boolean is14() {
return isSpecificationVersion(specVersion14);
}
/**
* Returns true if the specification version of the current
* Java Runtime library is 1.5. This is a convenience method
* completely equivalent to
* {@link #isSpecificationVersion(java.lang.String) isSpecificationVersion("1.5")}.
* @return if it is the version
*/
public static boolean is15() {
return isSpecificationVersion(specVersion15);
}
/**
* Returns true if the specification version of the current
* Java Runtime library the given version string.
*
* @param specVersion The specification version to compare to the
* specification of the current Hava Runtime library.
* @return if it is the version
*/
public static boolean isSpecificationVersion(String specVersion) {
if (specVersion == null || specVersion.length() == 0) {
return false;
} else {
return specVersion.equals(getSpecificationVersion());
}
}
/**
* Returns true if the specification version of the current
* Java Runtime library is compatible with 1.3, that is if the
* specification version of the current Java Runtime library is the same or
* newer than 1.3. This is a convenience method completely
* equivalent to
* {@link #isCompatibleWith(java.lang.String) isCompatibleWith("1.3")}.
* @return if it is compatible
*/
public static boolean isCompatibleWith13() {
return isCompatibleWith(specVersion13);
}
/**
* Returns true if the specification version of the current
* Java Runtime library is compatible with 1.4, that is if the
* specification version of the current Java Runtime library is the same or
* newer than 1.4. This is a convenience method completely
* equivalent to
* {@link #isCompatibleWith(java.lang.String) isCompatibleWith("1.4")}.
* @return if it is compatible
*/
public static boolean isCompatibleWith14() {
return isCompatibleWith(specVersion14);
}
/**
* Returns true if the specification version of the current
* Java Runtime library is compatible with 1.5, that is if the
* specification version of the current Java Runtime library is the same or
* newer than 1.5. This is a convenience method completely
* equivalent to
* {@link #isCompatibleWith(java.lang.String) isCompatibleWith("1.5")}.
* @return if it is compatible
*/
public static boolean isCompatibleWith15() {
return isCompatibleWith(specVersion15);
}
/**
* Returns true if the specification version of the current
* Java Runtime library is compatible with the given specification version,
* that is if the specification version of the current Java Runtime library
* is the same or newer than the given version.
*
* @param specVersion The specification version to compare to the
* specification of the current Hava Runtime library.
* @return if it is compatible
*/
public static boolean isCompatibleWith(String specVersion) {
return specPackage.isCompatibleWith(specVersion);
}
}