com.vladium.util

类 ClassLoaderResolver

java.lang.Object

com.vladium.util.ClassLoaderResolver

public abstract class ClassLoaderResolver
extends Object

This non-instantiable non-subclassable class acts as the global point for choosing a ClassLoader for dynamic class/resource loading at any point in an application.

作者:

Vlad Roubtsov, (C) 2003

另请参阅:

ResourceLoader, IClassLoadStrategy, DefaultClassLoadStrategy

方法概要

限定符和类型	方法和说明
static Class	getCallerClass(int callerOffset)
static ClassLoader	getClassLoader() This method selects the "best" classloader instance to be used for class/resource loading by whoever calls this method.
static ClassLoader	getClassLoader(Class caller) This method selects the "best" classloader instance to be used for class/resource loading by whoever calls this method.
static IClassLoadStrategy	getStrategy() Gets the current classloader selection strategy setting.
static boolean	isChild(ClassLoader loader1, ClassLoader loader2) Returns 'true' if 'loader2' is a delegation child of 'loader1' [or if 'loader1'=='loader2'].
static IClassLoadStrategy	setStrategy(IClassLoadStrategy strategy) Sets the classloader selection strategy to be used by subsequent calls to getClassLoader().

从类继承的方法 java.lang.Object

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

方法详细资料

getClassLoader

public static ClassLoader getClassLoader(Class caller)

This method selects the "best" classloader instance to be used for class/resource loading by whoever calls this method. The decision typically involves choosing between the caller's current, thread context, system, and other classloaders in the JVM and is made by the IClassLoadStrategy instance established by the last call to setStrategy(com.vladium.util.IClassLoadStrategy).

This method does not throw.

参数:

caller - [null input eliminates the caller's current classloader from consideration]

返回:

classloader to be used by the caller ['null' indicates the primordial loader]

getClassLoader

public static ClassLoader getClassLoader()

This method selects the "best" classloader instance to be used for class/resource loading by whoever calls this method. The decision typically involves choosing between the caller's current, thread context, system, and other classloaders in the JVM and is made by the IClassLoadStrategy instance established by the last call to setStrategy(com.vladium.util.IClassLoadStrategy).

This method uses its own caller to set the call context. To be able to override this decision explicitly, use getClassLoader(Class).

This method does not throw.

返回:

classloader to be used by the caller ['null' indicates the primordial loader]

getCallerClass

public static Class getCallerClass(int callerOffset)

isChild

public static boolean isChild(ClassLoader loader1,
                              ClassLoader loader2)

Returns 'true' if 'loader2' is a delegation child of 'loader1' [or if 'loader1'=='loader2']. Of course, this works only for classloaders that set their parent pointers correctly. 'null' is interpreted as the primordial loader [i.e., everybody's parent].

getStrategy

public static IClassLoadStrategy getStrategy()

Gets the current classloader selection strategy setting.

setStrategy

public static IClassLoadStrategy setStrategy(IClassLoadStrategy strategy)

Sets the classloader selection strategy to be used by subsequent calls to getClassLoader(). An instance of ClassLoaderResolver.DefaultClassLoadStrategy is in effect if this method is never called.

参数:

strategy - new strategy [may not be null]

返回:

previous setting