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ro.nolimits.rue.util
Class JarResources  

java.lang.Object
  ro.nolimits.rue.util.JarResources

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public final class JarResources

extends java.lang.Object

JarResources: JarResources maps all resources included in a Zip or Jar file. Additionaly, it provides a method to extract one as a blob.

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Field Summary
boolean	debugOn
private  java.util.Hashtable	htJarContents
private  java.util.Hashtable	htSizes
private  java.lang.String	jarFileName

 

Constructor Summary

JarResources(java.lang.String jarFileName)           creates a JarResources.

 

Method Summary
private  java.lang.String	dumpZipEntry(java.util.zip.ZipEntry ze)           Dumps a zip entry into a string.
byte[]	getResource(java.lang.String name)           Extracts a jar resource as a blob.
private  void	init()           initializes internal hash tables with Jar file resources.
static void	main(java.lang.String[] args)           Is a test driver.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

debugOn

public boolean debugOn

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htSizes

private java.util.Hashtable htSizes

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htJarContents

private java.util.Hashtable htJarContents

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jarFileName

private java.lang.String jarFileName

Constructor Detail

JarResources

public JarResources(java.lang.String jarFileName)

creates a JarResources. It extracts all resources from a Jar into an internal hashtable, keyed by resource names.

Method Detail

getResource

public byte[] getResource(java.lang.String name)

Extracts a jar resource as a blob.

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init

private void init()

initializes internal hash tables with Jar file resources.

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dumpZipEntry

private java.lang.String dumpZipEntry(java.util.zip.ZipEntry ze)

Dumps a zip entry into a string.

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main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Is a test driver. Given a jar file and a resource name, it trys to extract the resource and then tells us whether it could or not. Example Let's say you have a JAR file which jarred up a bunch of gif image files. Now, by using JarResources, you could extract, create, and display those images on-the-fly.

     ...
     JarResources JR=new JarResources("GifBundle.jar");
     Image image=Toolkit.createImage(JR.getResource("logo.gif");
     Image logo=Toolkit.getDefaultToolkit().createImage(
                   JR.getResources("logo.gif")
                   );
     ...
 

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