org.apache.velocity.runtime.resource.loader

Class ClasspathResourceLoader

java.lang.Object

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

org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader

public class ClasspathResourceLoader
extends ResourceLoader

ClasspathResourceLoader is a simple loader that will load templates from the classpath.

Will load templates from from multiple instances of and arbitrary combinations of:

• jar files
• zip files
• template directories (any directory containing templates)

This is a configuration-free loader, in that there are no parameters to be specified in the configuration properties, other than specifying this as the loader to use. For example the following is all that the loader needs to be functional:

  resource.loaders = class
  resource.loader.class.class =org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader
 

To use, put your template directories, jars and zip files into the classpath or other mechanisms that make resources accessible to the classloader.

This makes deployment trivial for web applications running in any Servlet 2.2 compliant servlet runner, such as Tomcat 3.2 and others.

For a Servlet Spec v2.2 servlet runner, just drop the jars of template files into the WEB-INF/lib directory of your webapp, and you won't have to worry about setting template paths or altering them with the root of the webapp before initializing.

I have also tried it with a WAR deployment, and that seemed to work just fine.

Version:

$Id: ClasspathResourceLoader.java 1866609 2019-09-08 10:42:47Z cbrisson $

Author:

Aki Nieminen, Geir Magnusson Jr.

Field Summary

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

className, isCachingOn, log, modificationCheckInterval, rsvc

Constructor Summary

Constructors

Constructor and Description
ClasspathResourceLoader()

Method Summary

Modifier and Type	Method and Description
long	getLastModified(Resource resource) Get the last modified time of the InputStream source that was used to create the template.
Reader	getResourceReader(String name, String encoding) Get a Reader so that the Runtime can build a template with it.
void	init(ExtProperties configuration) This is abstract in the base class, so we need it
boolean	isSourceModified(Resource resource) Given a template, check to see if the source of InputStream has been modified.

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

buildReader, 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

Constructor Detail

ClasspathResourceLoader

public ClasspathResourceLoader()

Method Detail

init

public void init(ExtProperties configuration)

This is abstract in the base class, so we need it

Specified by:

init in class ResourceLoader

Parameters:

configuration -

getResourceReader

public Reader getResourceReader(String name,
                                String encoding)
                         throws ResourceNotFoundException

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

Specified by:

getResourceReader in class ResourceLoader

Parameters:

name - name of template to get

encoding - asked encoding

Returns:

InputStream containing the template

Throws:

ResourceNotFoundException - if template not found in classpath.

Since:

2.0

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)