com.atlassian.confluence.util.velocity

Class ConfigurableResourceManager

java.lang.Object

com.atlassian.confluence.util.velocity.ConfigurableResourceManager

All Implemented Interfaces:

org.apache.velocity.runtime.resource.ResourceManager

Direct Known Subclasses:

ConfluenceVelocityResourceManager

public class ConfigurableResourceManager
extends Object
implements org.apache.velocity.runtime.resource.ResourceManager

Class to manage the text resource for the Velocity Runtime.

This is a copy of the Velocity 1.5 ResourceManagerImpl with the following changes for Confluence:

• added post processing template method for more flexible loader configuration
• a non-synchronized getResource(java.lang.String, int, java.lang.String) method
• getLoaderNameForResource(String) is more useful. It returns the ID of the loader rather than the class name

Ideally we would replace the entire implementation, making use of a richer resource loader interface.

Author:

Will Glass-Husain, Jason van Zyl, Paulo Gaspar, Geir Magnusson Jr., Henning P. Schmiedehausen

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	ConfigurableResourceManager.ResourceFactory Factory methods for Velocity resource objects

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.velocity.runtime.resource.ResourceCache	globalCache Object implementing ResourceCache to be our resource manager's Resource cache.
protected org.apache.velocity.runtime.log.Log	log Logging.
static int	RESOURCE_CONTENT A static content resource.
static int	RESOURCE_TEMPLATE A template resources.
protected List<org.apache.velocity.runtime.resource.loader.ResourceLoader>	resourceLoaders The List of templateLoaders that the Runtime will use to locate the InputStream source of a template.
protected org.apache.velocity.runtime.RuntimeServices	rsvc The internal RuntimeServices object.

Constructor Summary

Constructors

Constructor and Description
ConfigurableResourceManager()

Method Summary

Modifier and Type	Method and Description
String	getLoaderNameForResource(String resourceName) Determines if a template exists, and returns name of the loader that provides it.
org.apache.velocity.runtime.resource.Resource	getResource(String resourceName, int resourceType, String encoding) Gets the named resource.
protected ConfigurableResourceManager.ResourceFactory	getResourceFactory() Template method for provisioning a ConfigurableResourceManager.ResourceFactory.
void	initialize(org.apache.velocity.runtime.RuntimeServices rsvc) Initialize the ResourceManager.
protected org.apache.velocity.runtime.resource.Resource	loadResource(String resourceName, int resourceType, String encoding) Loads a resource from the current set of resource loaders.
protected org.apache.velocity.runtime.resource.loader.ResourceLoader	postProcessLoader(org.apache.velocity.runtime.resource.loader.ResourceLoader loader, org.apache.commons.collections.ExtendedProperties properties) Template method to allow subclasses to post process and possibly wrap a resource loader before it is added to the loader list.
protected void	refreshResource(org.apache.velocity.runtime.resource.Resource resource, String encoding) Takes an existing resource, and 'refreshes' it.

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE_TEMPLATE

public static final int RESOURCE_TEMPLATE

A template resources.

See Also:

Constant Field Values

RESOURCE_CONTENT

public static final int RESOURCE_CONTENT

A static content resource.

See Also:

Constant Field Values

globalCache

protected org.apache.velocity.runtime.resource.ResourceCache globalCache

Object implementing ResourceCache to be our resource manager's Resource cache.

resourceLoaders

protected final List<org.apache.velocity.runtime.resource.loader.ResourceLoader> resourceLoaders

The List of templateLoaders that the Runtime will use to locate the InputStream source of a template.

rsvc

protected org.apache.velocity.runtime.RuntimeServices rsvc

The internal RuntimeServices object.

log

protected org.apache.velocity.runtime.log.Log log

Logging.

Constructor Detail

ConfigurableResourceManager

public ConfigurableResourceManager()

Method Detail

initialize

public void initialize(org.apache.velocity.runtime.RuntimeServices rsvc)
                throws Exception

Initialize the ResourceManager.

Specified by:

initialize in interface org.apache.velocity.runtime.resource.ResourceManager

Parameters:

rsvc - The Runtime Services object which is associated with this Resource Manager.

Throws:

Exception

getResource

public org.apache.velocity.runtime.resource.Resource getResource(String resourceName,
                                                                 int resourceType,
                                                                 String encoding)
                                                          throws org.apache.velocity.exception.ResourceNotFoundException,
                                                                 org.apache.velocity.exception.ParseErrorException,
                                                                 Exception

Gets the named resource. Returned class type corresponds to specified type (i.e. Template to RESOURCE_TEMPLATE).

The original version of this class logs and rethrows virtually any exception thrown. This logging has been removed since these exceptions are often expected.

Specified by:

getResource in interface org.apache.velocity.runtime.resource.ResourceManager

Parameters:

resourceName - The name of the resource to retrieve.

resourceType - The type of resource (RESOURCE_TEMPLATE, RESOURCE_CONTENT, etc.).

encoding - The character encoding to use.

Returns:

Resource with the template parsed and ready.

Throws:

org.apache.velocity.exception.ResourceNotFoundException - if template not found from any available source.

org.apache.velocity.exception.ParseErrorException - if template cannot be parsed due to syntax (or other) error.

Exception - if a problem in parse

loadResource

protected org.apache.velocity.runtime.resource.Resource loadResource(String resourceName,
                                                                     int resourceType,
                                                                     String encoding)
                                                              throws org.apache.velocity.exception.ResourceNotFoundException,
                                                                     org.apache.velocity.exception.ParseErrorException,
                                                                     Exception

Loads a resource from the current set of resource loaders.

Parameters:

resourceName - The name of the resource to retrieve.

resourceType - The type of resource (RESOURCE_TEMPLATE, RESOURCE_CONTENT, etc.).

encoding - The character encoding to use.

Returns:

Resource with the template parsed and ready.

Throws:

org.apache.velocity.exception.ResourceNotFoundException - if template not found from any available source.

org.apache.velocity.exception.ParseErrorException - if template cannot be parsed due to syntax (or other) error.

Exception - if a problem in parse

refreshResource

protected void refreshResource(org.apache.velocity.runtime.resource.Resource resource,
                               String encoding)
                        throws org.apache.velocity.exception.ResourceNotFoundException,
                               org.apache.velocity.exception.ParseErrorException,
                               Exception

Takes an existing resource, and 'refreshes' it. This generally means that the source of the resource is checked for changes according to some cache/check algorithm and if the resource changed, then the resource data is reloaded and re-parsed.

Parameters:

resource - resource to refresh

encoding - character encoding of the resource to refresh.

Throws:

org.apache.velocity.exception.ResourceNotFoundException - if template not found from current source for this Resource

org.apache.velocity.exception.ParseErrorException - if template cannot be parsed due to syntax (or other) error.

Exception - if a problem in parse

getLoaderNameForResource

public String getLoaderNameForResource(String resourceName)

Determines if a template exists, and returns name of the loader that provides it. This is a slightly less hokey way to support the Velocity.templateExists() utility method, which was broken when per-template encoding was introduced. We can revisit this.

Specified by:

getLoaderNameForResource in interface org.apache.velocity.runtime.resource.ResourceManager

Parameters:

resourceName - Name of template or content resource

Returns:

name of loader than can provide it

postProcessLoader

protected org.apache.velocity.runtime.resource.loader.ResourceLoader postProcessLoader(org.apache.velocity.runtime.resource.loader.ResourceLoader loader,
                                                                                       org.apache.commons.collections.ExtendedProperties properties)

Template method to allow subclasses to post process and possibly wrap a resource loader before it is added to the loader list. This implementation does nothing.

Parameters:

loader - Resource loader to process

properties - Configured properties for the resource loader

Returns:

final resource loader instance to be used at runtime. Must not be null.

getResourceFactory

protected ConfigurableResourceManager.ResourceFactory getResourceFactory()

Template method for provisioning a ConfigurableResourceManager.ResourceFactory. Subclasses may customise this factory where necessary.

This implementation returns a strategy that delegates to the default Velocity resource factory methods.

Returns:

resource factory to use for this resource manager

See Also:

ConfigurableResourceManager.DefaultResourceFactory