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edu.emory.mathcs.util.classloader.jar
Class JarProxy  

java.lang.Object
  edu.emory.mathcs.util.classloader.jar.JarProxy

All Implemented Interfaces:

JarURLConnection.JarOpener

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public class JarProxy

extends java.lang.Object

implements JarURLConnection.JarOpener

Implementation of JarURLConnection.JarOpener that caches downloaded JAR files in a local file system.

Version:

1.0

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Nested Class Summary
private static class	JarProxy.CachedJarFile

 

Field Summary
private  java.util.Map	cache

 

Constructor Summary

JarProxy()

 

Method Summary
protected  void	clear()
protected  void	finalize()           Called on an object by the Virtual Machine at most once, at some point after the Object is determined unreachable but before it is destroyed.
java.util.jar.JarFile	openJarFile(java.net.JarURLConnection conn)           Given the URL connection (not yet connected), return JarFile representing the resource.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

cache

private final java.util.Map cache

Constructor Detail

JarProxy

public JarProxy()

Method Detail

openJarFile

public java.util.jar.JarFile openJarFile(java.net.JarURLConnection conn)
                                  throws java.io.IOException

Description copied from interface: JarURLConnection.JarOpener

Given the URL connection (not yet connected), return JarFile representing the resource. This method is invoked as a part of the connect method in JarURLConnection.

Specified by:

openJarFile in interface JarURLConnection.JarOpener

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clear

protected void clear()

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finalize

protected void finalize()

Description copied from class: java.lang.Object

Called on an object by the Virtual Machine at most once, at some point after the Object is determined unreachable but before it is destroyed. You would think that this means it eventually is called on every Object, but this is not necessarily the case. If execution terminates abnormally, garbage collection does not always happen. Thus you cannot rely on this method to always work. For finer control over garbage collection, use references from the java.lang.ref package.

Virtual Machines are free to not call this method if they can determine that it does nothing important; for example, if your class extends Object and overrides finalize to do simply super.finalize().

finalize() will be called by a java.lang.Thread that has no locks on any Objects, and may be called concurrently. There are no guarantees on the order in which multiple objects are finalized. This means that finalize() is usually unsuited for performing actions that must be thread-safe, and that your implementation must be use defensive programming if it is to always work.

If an Exception is thrown from finalize() during garbage collection, it will be patently ignored and the Object will still be destroyed.

It is allowed, although not typical, for user code to call finalize() directly. User invocation does not affect whether automatic invocation will occur. It is also permitted, although not recommended, for a finalize() method to "revive" an object by making it reachable from normal code again.

Unlike constructors, finalize() does not get called for an object's superclass unless the implementation specifically calls super.finalize().

The default implementation does nothing.

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