Package org.netlib.utils
Class JNIMethods
java.lang.Object
org.netlib.utils.JNIMethods
Static helper methods for dealing with the Java Native Interface and detection of
operating systems and architectures. The main purpose of this class is to provide a
more portable alternative to the System.loadLibrary method (and horrible syntax of
Bundle-NativeCode in MANIFEST files) when bundling binaries as part of a jar (either
inside, or in a directory structure nearby).
Note on usage: unfortunately it is not possible to provide a loadLibrary(String) method here as it needs to know the calling class, which is lost when wrapped here. To load a native library using this class, call the getPortableLibraryName() method to return a String which may then be passed to System.loadLibrary().
Note: due to the nature of this class, a portable JUnit TestCase is not possible.
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic enum
Enumeration of common CPU architectures.static enum
Enumeration of common operating systems, independent of version or architecture. -
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final JNIMethods.ARCHType
Stores the CPU Architecture the JVM is currently running on.static final JNIMethods.OSType
Stores the operating system the JVM is currently running on. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic String
getPortableLibraryName
(String name) The System.mapLibraryName method is broken in the sense that it does not give unique names for operating systems and architectures.static void
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Field Details
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ARCH
Stores the CPU Architecture the JVM is currently running on. -
OS
Stores the operating system the JVM is currently running on.
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Constructor Details
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JNIMethods
public JNIMethods()
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Method Details
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getPortableLibraryName
The System.mapLibraryName method is broken in the sense that it does not give unique names for operating systems and architectures. In order to facilitate cross-platform compatibility allowing bundled binary files, this method will return a unique library name, dependent on the operating system and architecture. The return value of this method should be passed to the System.loadLibrary method instead of the raw library name.The resulting filename will be constructed by forcing the library name to lowercase and appending an extra String that is defined by the operating system (the architecture is only encoded if it is relevant). Some examples are for the parameter 'name':-
- Apple (G3, G4): "name-apple-ppc"
- Apple (G5): "name-apple-ppc_64"
- Apple (Intel): "name-apple-x86"
- Apple (Intel 64 Bit mode): "name-apple-x86_64"
- Linux (i686): "name-linux-x86"
- Linux (Intel/AMD 64): "name-linux-x86_64"
- Linux (sparc): "name-linux-sparc"
- Linux (PPC 32 bit): "name-linux-ppc"
- Linux (PPC 64 bit): "name-linux-ppc_64"
- Windows XP/Vista (i686): "name-windows-x86"
- Windows XP/Vista (Intel/AMD 64): "name-windows-x86_64"
- Sun Solaris (Blade): "name-sun-sparc"
- Sun Solaris (Intel 64 bit): "name-sun-x86_64"
- Parameters:
name
-- Returns:
- Throws:
IllegalArgumentException
- if the input name is zero length or contains a directory separator character.
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main
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