org.apache.tools.ant.util
Class JavaEnvUtils

java.lang.Object
  |
  +--org.apache.tools.ant.util.JavaEnvUtils

public final class JavaEnvUtils

extends java.lang.Object

A set of helper methods related to locating executables or checking conditons of a given Java installation.

Since:

Ant 1.5

Field Summary

static java.lang.String	JAVA_1_0 Version constant for Java 1.0
static java.lang.String	JAVA_1_1 Version constant for Java 1.1
static java.lang.String	JAVA_1_2 Version constant for Java 1.2
static java.lang.String	JAVA_1_3 Version constant for Java 1.3
static java.lang.String	JAVA_1_4 Version constant for Java 1.4
static java.lang.String	JAVA_1_5 Version constant for Java 1.5

Method Summary

static java.lang.String	getJavaVersion() Returns the version of Java this class is running under.
static java.lang.String	getJdkExecutable(java.lang.String command) Finds an executable that is part of a JDK installation based on the java.home system property.
static java.lang.String	getJreExecutable(java.lang.String command) Finds an executable that is part of a JRE installation based on the java.home system property.
static java.util.Vector	getJrePackages() get a vector of strings of packages built into that platforms runtime jar(s)
static java.util.Vector	getJrePackageTestCases() Testing helper method; kept here for unification of changes.
static boolean	isJavaVersion(java.lang.String version) Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class.
static boolean	isKaffe() Checks whether the current Java VM is Kaffe.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

JAVA_1_0

public static final java.lang.String JAVA_1_0

Version constant for Java 1.0

See Also:

Constant Field Values

JAVA_1_1

public static final java.lang.String JAVA_1_1

Version constant for Java 1.1

See Also:

Constant Field Values

JAVA_1_2

public static final java.lang.String JAVA_1_2

Version constant for Java 1.2

See Also:

Constant Field Values

JAVA_1_3

public static final java.lang.String JAVA_1_3

Version constant for Java 1.3

See Also:

Constant Field Values

JAVA_1_4

public static final java.lang.String JAVA_1_4

Version constant for Java 1.4

See Also:

Constant Field Values

JAVA_1_5

public static final java.lang.String JAVA_1_5

Version constant for Java 1.5

See Also:

Constant Field Values

Method Detail

getJavaVersion

public static java.lang.String getJavaVersion()

Returns the version of Java this class is running under.

Returns:

the version of Java as a String, e.g. "1.1"

isJavaVersion

public static boolean isJavaVersion(java.lang.String version)

Compares the current Java version to the passed in String - assumes the argument is one of the constants defined in this class.

Parameters:

version - the version to check against the current version.

Returns:

true if the version of Java is the same as the given version.

Since:

Ant 1.5

isKaffe

public static boolean isKaffe()

Checks whether the current Java VM is Kaffe.

Returns:

true if the current Java VM is Kaffe.

Since:

Ant 1.6.3

See Also:

getJreExecutable

public static java.lang.String getJreExecutable(java.lang.String command)

Finds an executable that is part of a JRE installation based on the java.home system property.

java, keytool, policytool, orbd, rmid, rmiregistry, servertool and tnameserv are JRE executables on Sun based JRE's.

You typically find them in JAVA_HOME/jre/bin if JAVA_HOME points to your JDK installation. JDK < 1.2 has them in the same directory as the JDK executables.

Parameters:

command - the java executable to find.

Returns:

the path to the command.

Since:

Ant 1.5

getJdkExecutable

public static java.lang.String getJdkExecutable(java.lang.String command)

Finds an executable that is part of a JDK installation based on the java.home system property.

You typically find them in JAVA_HOME/bin if JAVA_HOME points to your JDK installation.

Parameters:

command - the java executable to find.

Returns:

the path to the command.

Since:

Ant 1.5

getJrePackageTestCases

public static java.util.Vector getJrePackageTestCases()

Testing helper method; kept here for unification of changes.

Returns:

a list of test classes depending on the java version.

getJrePackages

public static java.util.Vector getJrePackages()

get a vector of strings of packages built into that platforms runtime jar(s)

Returns:

list of packages.