net.sf.jasperreports.engine.util
Class JRSingletonCache

java.lang.Object
  net.sf.jasperreports.engine.util.JRSingletonCache

public class JRSingletonCache
extends java.lang.Object

Utility to use as a soft cache of singleton instances.

Version:

$Id: JRSingletonCache.java 3034 2009-08-27 11:58:04Z teodord $

Author:

Lucian Chirita ([email protected])

Constructor Summary

JRSingletonCache(java.lang.Class itf)
Creates a cache of singleton instances.

Method Summary

protected java.lang.Object	createInstance(java.lang.String className)
java.lang.Object	getCachedInstance(java.lang.String className) Returns the singleton instance corresponding to a class.
protected java.util.Map	getContextInstanceCache()
protected java.lang.Object	getContextKey()

Methods inherited from class java.lang.Object

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

Constructor Detail

JRSingletonCache

public JRSingletonCache(java.lang.Class itf)

Creates a cache of singleton instances.

Parameters:

itf - a interface or class that should be implemented by all classes cached by this object

Method Detail

getCachedInstance

public java.lang.Object getCachedInstance(java.lang.String className)
                                   throws JRException

Returns the singleton instance corresponding to a class.

The instance is first searched into the cache and created if not found.

The class is expected to have a no-argument constructor.

Parameters:

className -

Returns:

the singleton instance corresponding to a class

Throws:

JRException

createInstance

protected java.lang.Object createInstance(java.lang.String className)
                                   throws JRException

Throws:

JRException

getContextInstanceCache

protected java.util.Map getContextInstanceCache()

getContextKey

protected java.lang.Object getContextKey()