Package org.apache.velocity.runtime.resource.loader

Class JarResourceLoader

java.lang.Object

org.apache.velocity.runtime.resource.loader.ResourceLoader

org.apache.velocity.runtime.resource.loader.JarResourceLoader

public class JarResourceLoader
extends ResourceLoader

ResourceLoader to load templates from multiple Jar files.

The configuration of the JarResourceLoader is straightforward - You simply add the JarResourceLoader to the configuration via

    resource.loader = jar
    jar.resource.loader.class = org.apache.velocity.runtime.resource.loader.JarResourceLoader
    jar.resource.loader.path = list of JAR <URL>s
 

So for example, if you had a jar file on your local filesystem, you could simply do

    jar.resource.loader.path = jar:file:/opt/myfiles/jar1.jar
    

Note that jar specification for the .path configuration property conforms to the same rules for the java.net.JarUrlConnection class.

For a working example, see the unit test case, org.apache.velocity.test.MultiLoaderTestCase class

Version:

$Id: JarResourceLoader.java 691884 2008-09-04 06:46:51Z nbubna $

Field Summary

Fields

Modifier and Type	Field	Description
private Map	entryDirectory	Maps entries to the parent JAR File Key = the entry *excluding* plain directories Value = the JAR URL
private Map	jarfiles	Maps JAR URLs to the actual JAR Key = the JAR URL Value = the JAR

Fields inherited from class org.apache.velocity.runtime.resource.loader.ResourceLoader

className, isCachingOn, log, modificationCheckInterval, rsvc

Constructor Summary

Constructors

Constructor	Description
JarResourceLoader()

Method Summary

Modifier and Type	Method	Description
private void	addEntries(Hashtable entries)	Copy all the entries into the entryDirectory It will overwrite any duplicate keys.
private void	closeJar(String path)	Closes a Jar file and set its URLConnection to null.
long	getLastModified(Resource resource)	Get the last modified time of the InputStream source that was used to create the template.
InputStream	getResourceStream(String source)	Get an InputStream so that the Runtime can build a template with it.
void	init(org.apache.commons.collections.ExtendedProperties configuration)	Called by Velocity to initialize the loader
boolean	isSourceModified(Resource resource)	Given a template, check to see if the source of InputStream has been modified.
private void	loadJar(String path)

Methods inherited from class org.apache.velocity.runtime.resource.loader.ResourceLoader

commonInit, getClassName, getModificationCheckInterval, isCachingOn, resourceExists, setCachingOn, setModificationCheckInterval

Methods inherited from class java.lang.Object

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

Field Details

entryDirectory

private Map entryDirectory

Maps entries to the parent JAR File Key = the entry *excluding* plain directories Value = the JAR URL

jarfiles

private Map jarfiles

Maps JAR URLs to the actual JAR Key = the JAR URL Value = the JAR

Constructor Details

JarResourceLoader

public JarResourceLoader()

Method Details

init

public void init(org.apache.commons.collections.ExtendedProperties configuration)

Called by Velocity to initialize the loader

Specified by:

init in class ResourceLoader

Parameters:

configuration -

loadJar

private void loadJar(String path)

closeJar

private void closeJar(String path)

Closes a Jar file and set its URLConnection to null.

addEntries

private void addEntries(Hashtable entries)

Copy all the entries into the entryDirectory It will overwrite any duplicate keys.

getResourceStream

public InputStream getResourceStream(String source)
                              throws ResourceNotFoundException

Get an InputStream so that the Runtime can build a template with it.

Specified by:

getResourceStream in class ResourceLoader

Parameters:

source - name of template to get

Returns:

InputStream containing the template

Throws:

ResourceNotFoundException - if template not found in the file template path.

isSourceModified

public boolean isSourceModified(Resource resource)

Description copied from class: ResourceLoader

Given a template, check to see if the source of InputStream has been modified.

Specified by:

isSourceModified in class ResourceLoader

Returns:

True if the resource has been modified.

See Also:

• ResourceLoader.isSourceModified(org.apache.velocity.runtime.resource.Resource)

getLastModified

public long getLastModified(Resource resource)

Description copied from class: ResourceLoader

Get the last modified time of the InputStream source that was used to create the template. We need the template here because we have to extract the name of the template in order to locate the InputStream source.

Specified by:

getLastModified in class ResourceLoader

Returns:

Time in millis when the resource has been modified.

See Also:

• ResourceLoader.getLastModified(org.apache.velocity.runtime.resource.Resource)