org.rapidcontext.util

Class ClasspathUtil

java.lang.Object

org.rapidcontext.util.ClasspathUtil

public abstract class ClasspathUtil
extends java.lang.Object

A set of utility methods for working with the classpath and class loaders.

Version:

1.0

Author:

Per Cederberg

Constructor Summary

Constructors

Constructor and Description
ClasspathUtil()

Method Summary

Modifier and Type	Method and Description
static java.lang.ClassLoader	classLoader(java.lang.Class cls) Returns the class loader for the specified class.
static java.net.URL	locate(java.lang.Class cls) Returns the resource URL corresponding the the specified class.
static java.net.URL	locate(java.lang.Class cls, java.lang.String path) Returns the resource URL corresponding the the specified path.
static java.io.File	locateFile(java.lang.Class cls) Returns the file containing the specified class.
static java.util.jar.Manifest	manifest(java.lang.Class cls) Returns the manifest for the JAR file containing the specified class.
static java.lang.String	manifestAttribute(java.lang.Class cls, java.lang.String name) Returns a single attribute value from the JAR manifest for a class.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClasspathUtil

public ClasspathUtil()

Method Detail

classLoader

public static java.lang.ClassLoader classLoader(java.lang.Class cls)

Returns the class loader for the specified class.

Parameters:

cls - the class to check

Returns:

the class loader for the class, or the system class loader if null

locate

public static java.net.URL locate(java.lang.Class cls)

Returns the resource URL corresponding the the specified class.

Parameters:

cls - the class to check

Returns:

the resource URL for the class, or null if not found

locate

public static java.net.URL locate(java.lang.Class cls,
                                  java.lang.String path)

Returns the resource URL corresponding the the specified path. The resource will be located using the class loader for the specified class. Also, the resource path will be normalized, removing any "classpath:" prefix and fixing the usage of "/" chars.

Parameters:

cls - the base class (loader) to use

path - the resource path

Returns:

the resource URL, or null if not found

locateFile

public static java.io.File locateFile(java.lang.Class cls)

Returns the file containing the specified class. This method uses the class resource URL to attempt to guess the file system location of the class or JAR file.

Parameters:

cls - the class to check

Returns:

the absolute file system location for the class, or null if not found

manifest

public static java.util.jar.Manifest manifest(java.lang.Class cls)

Returns the manifest for the JAR file containing the specified class. The JAR file will be located via the class loader for the specified class.

Parameters:

cls - the class to check

Returns:

the JAR manifest data, or null if not found

manifestAttribute

public static java.lang.String manifestAttribute(java.lang.Class cls,
                                                 java.lang.String name)

Returns a single attribute value from the JAR manifest for a class. The JAR file will be located via the class loader for the specified class.

Parameters:

cls - the class to check

name - the main attribute name

Returns:

the attribute value, or null if not found