org.apache.commons.discovery.jdk

Class JDKHooks

java.lang.Object

org.apache.commons.discovery.jdk.JDKHooks

Direct Known Subclasses:

JDK11Hooks, JDK12Hooks

public abstract class JDKHooks
extends Object

JDK Hooks to extract properties/resources.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JDKHooks() Hidden constructor, this class can't be directly instantiated.

Method Summary

Modifier and Type	Method and Description
static JDKHooks	getJDKHooks() Return singleton object representing JVM hooks/tools.
abstract Enumeration<URL>	getResources(ClassLoader loader, String resourceName) Resolve resource with given names and make them available in the returned iterator.
abstract ClassLoader	getSystemClassLoader() The system class loader is available for JDK 1.2 or later, if certain security conditions are met.
abstract String	getSystemProperty(String propName) Get the system property
abstract ClassLoader	getThreadContextClassLoader() The thread context class loader is available for JDK 1.2 or later, if certain security conditions are met.

Methods inherited from class java.lang.Object

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

Constructor Detail

JDKHooks

protected JDKHooks()

Hidden constructor, this class can't be directly instantiated.

Method Detail

getJDKHooks

public static final JDKHooks getJDKHooks()

Return singleton object representing JVM hooks/tools. TODO: add logic to detect JDK level.

Returns:

The detected JDKHooks

getSystemProperty

public abstract String getSystemProperty(String propName)

Get the system property

Parameters:

propName - name of the property

Returns:

value of the property

getThreadContextClassLoader

public abstract ClassLoader getThreadContextClassLoader()

The thread context class loader is available for JDK 1.2 or later, if certain security conditions are met.

Returns:

The thread context class loader, if available. Otherwise return null.

getSystemClassLoader

public abstract ClassLoader getSystemClassLoader()

The system class loader is available for JDK 1.2 or later, if certain security conditions are met.

Returns:

The system class loader, if available. Otherwise return null.

getResources

public abstract Enumeration<URL> getResources(ClassLoader loader,
                                              String resourceName)
                                       throws IOException

Resolve resource with given names and make them available in the returned iterator.

Parameters:

loader - The class loader used to resolve resources

resourceName - The resource name to resolve

Returns:

The iterator over the URL resolved resources

Throws:

IOException - if any error occurs while loading the resource