org.mdiutil.lang

Class SystemUtils

java.lang.Object

org.mdiutil.lang.SystemUtils

public class SystemUtils
extends Object

This class provides several System utilities.

Field Summary

Fields

Modifier and Type	Field and Description
static short	ARCH_ARM_32 The type for 32 bits ARM architectures.
static short	ARCH_ARM_64 The type for 64 bits ARM architectures.
static short	ARCH_OTHER The type for unknown processor architectures.
static short	ARCH_PPC_32 The type for 32 bits PPC architectures.
static short	ARCH_PPC_64 The type for 64 bits PPC architectures.
static short	ARCH_SPARC_32 The type for 32 bits SPARC architectures.
static short	ARCH_SPARC_64 The type for 64 bits SPARC architectures.
static short	ARCH_X86_32 The type for 32 bits x86 architectures.
static short	ARCH_X86_64 The type for 64 bits x86 architectures.
static short	OS_LINUX The type for Linux OS.
static short	OS_MACOSX The type for MAC OS X OS.
static short	OS_OTHER The type for OS which are neither Mac OS X, Windows, Linux, or Unix.
static short	OS_UNIX The type for Unix OS.
static short	OS_WINDOWS The type for Windows OS.

Method Summary

Modifier and Type	Method and Description
static short	getArchitecture() Return the JVM Platform architecture.
static short	getExecutableType(File file) Return the type of an executable.
static URL	getLocation(Class<?> clazz) Return the Location of a Class.
static int	getMajorVersion() Return the major version of the JRE.
static int	getMajorVersion(String version) Return the major version of a JRE.
static short	getPlatformType() Return the OS type.
static boolean	is32Bits() Return true if the JVM Platform architecture is detected as 32 bits.
static boolean	is64Bits() Return true if the JVM Platform architecture is detected as 64 bits.
static boolean	isAtLeastVersion(String javaVersion) Return true if the current Java version is at least equal to the specified version.
static boolean	isAtLeastVersion(String currentVersion, String javaVersion) Return true if the current Java version is at least equal to the specified version.
static boolean	isBetweenVersions(String currentVersion, String atLeastVersion, String atMostVersion) Return true if the current Java version is between the atLeastVersion and atMostVersion.
static boolean	isBetweenVersions(String currentVersion, String atLeastVersion, String atMostVersion, boolean strict) Return true if the current Java version is between the atLeastVersion and atMostVersion.
static boolean	isCompatible(File file, boolean strict) Return true if an executable file is compatible with the OS architecture used by the JVM.
static boolean	isMACOSXPlatform() Return true if the platform is MAC OS X.
static boolean	isNewerThanVersion(int version) Return true if the java vesion is newer than a specified version.
static boolean	isUnixPlatform() Return true if the platform is an UNIX-like OS.
static boolean	isWindowsPlatform() Return true if the platform is a Windows OS.

Methods inherited from class java.lang.Object

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

Field Detail

OS_OTHER

public static final short OS_OTHER

The type for OS which are neither Mac OS X, Windows, Linux, or Unix.

See Also:

Constant Field Values

OS_MACOSX

public static final short OS_MACOSX

The type for MAC OS X OS.

See Also:

Constant Field Values

OS_WINDOWS

public static final short OS_WINDOWS

The type for Windows OS.

See Also:

Constant Field Values

OS_LINUX

public static final short OS_LINUX

The type for Linux OS.

See Also:

Constant Field Values

OS_UNIX

public static final short OS_UNIX

The type for Unix OS.

See Also:

Constant Field Values

ARCH_OTHER

public static final short ARCH_OTHER

The type for unknown processor architectures.

See Also:

Constant Field Values

ARCH_X86_32

public static final short ARCH_X86_32

The type for 32 bits x86 architectures.

See Also:

Constant Field Values

ARCH_X86_64

public static final short ARCH_X86_64

The type for 64 bits x86 architectures.

See Also:

Constant Field Values

ARCH_PPC_32

public static final short ARCH_PPC_32

The type for 32 bits PPC architectures.

See Also:

Constant Field Values

ARCH_PPC_64

public static final short ARCH_PPC_64

The type for 64 bits PPC architectures.

See Also:

Constant Field Values

ARCH_SPARC_32

public static final short ARCH_SPARC_32

The type for 32 bits SPARC architectures.

See Also:

Constant Field Values

ARCH_SPARC_64

public static final short ARCH_SPARC_64

The type for 64 bits SPARC architectures.

See Also:

Constant Field Values

ARCH_ARM_32

public static final short ARCH_ARM_32

The type for 32 bits ARM architectures.

See Also:

Constant Field Values

ARCH_ARM_64

public static final short ARCH_ARM_64

The type for 64 bits ARM architectures.

See Also:

Constant Field Values

Method Detail

getPlatformType

public static final short getPlatformType()

Return the OS type. The supported OS are:

• OS_MACOSX
• OS_WINDOWS
• OS_LINUX
• OS_UNIX for Unix systems (AIX, SunOS, hp-ux)
• OS_OTHER for unknown OS types

Returns:

the OS type

getArchitecture

public static final short getArchitecture()

Return the JVM Platform architecture. Note that a 64 bits platform with a 32 bits JVM will be detected as 32 bits.

• ARCH_X86_32 and ARCH_X86_64 for x86 architectures
• ARCH_PPC_32 and ARCH_PPC_64 for PPC architectures
• ARCH_SPARC_32 and ARCH_SPARC_64 for SPARC architectures
• ARCH_ARM_32 and ARCH_ARM_64 for ARM architectures
• ARCH_OTHER for unknown architectures

Returns:

the JVM Platform architecture

is64Bits

public static final boolean is64Bits()

Return true if the JVM Platform architecture is detected as 64 bits. Note that a 64 bits platform with a 32 bits JVM will be detected as 32 bits.

Returns:

true if the JVM Platform architecture is detected as 64 bits

is32Bits

public static final boolean is32Bits()

Return true if the JVM Platform architecture is detected as 32 bits. Note that a 64 bits platform with a 32 bits JVM will be detected as 32 bits.

Returns:

true if the JVM Platform architecture is detected as 32 bits

isUnixPlatform

public static boolean isUnixPlatform()

Return true if the platform is an UNIX-like OS.

Returns:

true if the platform is an UNIX-like OS

isWindowsPlatform

public static boolean isWindowsPlatform()

Return true if the platform is a Windows OS.

Returns:

true if the platform is a Windows OS

isMACOSXPlatform

public static boolean isMACOSXPlatform()

Return true if the platform is MAC OS X.

Returns:

true if the platform is MAC OS X

isCompatible

public static final boolean isCompatible(File file,
                                         boolean strict)

Return true if an executable file is compatible with the OS architecture used by the JVM. The formats which are supported are:

• Portable Executable Format executable on Windows for 32 bits or 64 bits
• Executable and Linkable Format (elf) executable on Unix-like systems for 32 bits or 64 bits
• Mach-O executable on Mac OS X for 32 bits or 64 bits (Universal binaries are not supported)

Parameters:

file - the executable file

strict - if the type must strictly be the same as the OS architecture

Returns:

true if the executable file is compatible with the OS architecture used by the JVM

getExecutableType

public static final short getExecutableType(File file)

Return the type of an executable. The possible returned values are:

• HeaderDecoder.EXE_INVALID: the value for invalid executable Files (can not exist, not being readable, or not being a valid executable File for the Platform)
• HeaderDecoder.EXE_32BITS: the value for 32 bits executables
• HeaderDecoder.EXE_64BITS: the value for 64 bits executables
• HeaderDecoder.EXE_UNIVERSAL: the value for universal binaries executables

Parameters:

file - the executable file

Returns:

the type of the executable

isAtLeastVersion

public static boolean isAtLeastVersion(String javaVersion)

Return true if the current Java version is at least equal to the specified version. The algorithm take care of the pattern for the String-naming convention for the version, taking into account all digits, including those used for the maintenance version but not using the last part used for non-GA versions (see J2SE SDK/JRE Version String Naming Convention).

For example, if the current version is 1.7.0_13, the result would be, depending on the specified Java version:

• 1.7: as 1.7.0_13 ≥ 1.7, the method would return true
• 1.7.0_14: as 1.7.0_13 < 1.7.0_14, the method would return false
• 1.7.0_12: as 1.7.0_13 ≥ 1.7.0_12, the method would return true

Parameters:

javaVersion - the specified Java version

Returns:

true if the current Java version is at least equal to the specified version

isNewerThanVersion

public static boolean isNewerThanVersion(int version)

Return true if the java vesion is newer than a specified version.

Parameters:

version - the version

Returns:

true if the java vesion is newer than the specified version

isBetweenVersions

public static final boolean isBetweenVersions(String currentVersion,
                                              String atLeastVersion,
                                              String atMostVersion)

Return true if the current Java version is between the atLeastVersion and atMostVersion. The comparison includes the versions themselves.

For example, if the current version is 1.7.0_13, the result would be, depending on the specified Java version:

• [1.7, 1.7]: as 1.7.0_13 ≥ 1.7, the method would return true
• [1.7.0_14, 1.8]: as 1.7.0_13 < 1.7.0_14, the method would return false
• [1.7, 1.7.0_12]: as 1.7.0_13 ≥ 1.7.0_12, the method would return true

Parameters:

currentVersion - the current Java version

atLeastVersion - the specified at least Java version

atMostVersion - the specified at most Java version

Returns:

true if the current Java version is between the atLeastVersion and atMostVersion

isBetweenVersions

public static final boolean isBetweenVersions(String currentVersion,
                                              String atLeastVersion,
                                              String atMostVersion,
                                              boolean strict)

Return true if the current Java version is between the atLeastVersion and atMostVersion. The comparison includes the versions themselves is the strict parameter is false.

For example, if strict is false, if the current version is 1.7.0_13, the result would be, depending on the specified Java version:

• [1.7, 1.7]: as 1.7.0_13 ≥ 1.7, the method would return true
• [1.7.0_14, 1.8]: as 1.7.0_13 < 1.7.0_14, the method would return false
• [1.7, 1.7.0_12]: as 1.7.0_13 ≥ 1.7.0_12, the method would return true

If strict is true, if the current version is 1.8, the result would be, depending on the specified Java version:

• [1.7, 1.8]: as 1.8 &eq; 1.8, the method would return false

Parameters:

currentVersion - the current Java version

atLeastVersion - the specified at least Java version

atMostVersion - the specified at most Java version

strict - true if the at most Java version is excluded

Returns:

true if the current Java version is between the atLeastVersion and atMostVersion

isAtLeastVersion

public static final boolean isAtLeastVersion(String currentVersion,
                                             String javaVersion)

Return true if the current Java version is at least equal to the specified version.

Parameters:

currentVersion - the current Java version

javaVersion - the specified Java version

Returns:

true if the current Java version is at least equal to the specified version

getMajorVersion

public static final int getMajorVersion()

Return the major version of the JRE.

Returns:

the major version

getMajorVersion

public static final int getMajorVersion(String version)

Return the major version of a JRE.

Parameters:

version - the JRE version

Returns:

the major version

getLocation

public static final URL getLocation(Class<?> clazz)

Return the Location of a Class. It will be the parent directory if the Class is not in a Jar file, or the parent directory of the Jar file if it is in a Jar file.

Parameters:

clazz - the Class

Returns:

the Location of a Class