org.apache.velocity.runtime.resource
Class ResourceManagerImpl

java.lang.Object
  |
  +--org.apache.velocity.runtime.resource.ResourceManagerImpl

All Implemented Interfaces:

ResourceManager

public class ResourceManagerImpl

extends java.lang.Object

implements ResourceManager

Class to manage the text resource for the Velocity Runtime.

Version:

$Id: ResourceManagerImpl.java,v 1.5 2002/02/05 04:55:17 dlr Exp $

Author:

Jason van Zyl, Paulo Gaspar, Geir Magnusson Jr.

Field Summary

protected ResourceCache	globalCache Object implementing ResourceCache to be our resource manager's Resource cache.
private boolean	logWhenFound switch to turn off log notice when a resource is found for the first time.
static int	RESOURCE_CONTENT A static content resource.
private static java.lang.String	RESOURCE_LOADER_IDENTIFIER token used to identify the loader internally
static int	RESOURCE_TEMPLATE A template resources.
private boolean	resourceLoaderInitializersActive Each loader needs a configuration object for its initialization, this flags keeps track of whether or not the configuration objects have been created for the resource loaders.
protected java.util.ArrayList	resourceLoaders The List of templateLoaders that the Runtime will use to locate the InputStream source of a template.
protected RuntimeServices	rsvc
private java.util.ArrayList	sourceInitializerList This is a list of the template input stream source initializers, basically properties for a particular template stream source.
private java.util.Hashtable	sourceInitializerMap This is a map of public name of the template stream source to it's initializer.

Constructor Summary

ResourceManagerImpl()

Method Summary

private void	assembleResourceLoaderInitializers() This will produce a List of Hashtables, each hashtable contains the intialization info for a particular resource loader.
java.lang.String	getLoaderNameForResource(java.lang.String resourceName) Determines is a template exists, and returns name of the loader that provides it.
Resource	getResource(java.lang.String resourceName, int resourceType) Deprecated. Use getResource(String resourceName, int resourceType, String encoding )
Resource	getResource(java.lang.String resourceName, int resourceType, java.lang.String encoding) Gets the named resource.
void	initialize(RuntimeServices rs) Initialize the ResourceManager.
protected Resource	loadResource(java.lang.String resourceName, int resourceType, java.lang.String encoding) Loads a resource from the current set of resource loaders
protected void	refreshResource(Resource resource, java.lang.String encoding) Takes an existing resource, and 'refreshes' it.

Methods inherited from class java.lang.Object

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

Field Detail

RESOURCE_TEMPLATE

public static final int RESOURCE_TEMPLATE

A template resources.

RESOURCE_CONTENT

public static final int RESOURCE_CONTENT

A static content resource.

RESOURCE_LOADER_IDENTIFIER

private static final java.lang.String RESOURCE_LOADER_IDENTIFIER

token used to identify the loader internally

globalCache

protected ResourceCache globalCache

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

resourceLoaders

protected java.util.ArrayList resourceLoaders

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

sourceInitializerList

private java.util.ArrayList sourceInitializerList

This is a list of the template input stream source initializers, basically properties for a particular template stream source. The order in this list reflects numbering of the properties i.e. .resource.loader. =

sourceInitializerMap

private java.util.Hashtable sourceInitializerMap

This is a map of public name of the template stream source to it's initializer. This is so that clients of velocity can set properties of a template source stream with its public name. So for example, a client could set the File.resource.path property and this would change the resource.path property for the file template stream source.

resourceLoaderInitializersActive

private boolean resourceLoaderInitializersActive

Each loader needs a configuration object for its initialization, this flags keeps track of whether or not the configuration objects have been created for the resource loaders.

logWhenFound

private boolean logWhenFound

switch to turn off log notice when a resource is found for the first time.

rsvc

protected RuntimeServices rsvc

Constructor Detail

ResourceManagerImpl

public ResourceManagerImpl()

Method Detail

initialize

public void initialize(RuntimeServices rs)
                throws java.lang.Exception

Initialize the ResourceManager. It is assumed that assembleSourceInitializers() has been called before this is run.

Specified by:

initialize in interface ResourceManager

assembleResourceLoaderInitializers

private void assembleResourceLoaderInitializers()

This will produce a List of Hashtables, each hashtable contains the intialization info for a particular resource loader. This Hastable will be passed in when initializing the the template loader.

getResource

public Resource getResource(java.lang.String resourceName,
                            int resourceType,
                            java.lang.String encoding)
                     throws ResourceNotFoundException,
                            ParseErrorException,
                            java.lang.Exception

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

Specified by:

getResource in interface 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:

ResourceNotFoundException - if template not found from any available source.

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

java.lang.Exception - if a problem in parse

loadResource

protected Resource loadResource(java.lang.String resourceName,
                                int resourceType,
                                java.lang.String encoding)
                         throws ResourceNotFoundException,
                                ParseErrorException,
                                java.lang.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:

ResourceNotFoundException - if template not found from any available source.

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

java.lang.Exception - if a problem in parse

refreshResource

protected void refreshResource(Resource resource,
                               java.lang.String encoding)
                        throws ResourceNotFoundException,
                               ParseErrorException,
                               java.lang.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

Throws:

ResourceNotFoundException - if template not found from current source for this Resource

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

java.lang.Exception - if a problem in parse

getResource

public Resource getResource(java.lang.String resourceName,
                            int resourceType)
                     throws ResourceNotFoundException,
                            ParseErrorException,
                            java.lang.Exception

Deprecated. Use getResource(String resourceName, int resourceType, String encoding )

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

Parameters:

resourceName - The name of the resource to retrieve.

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

Returns:

Resource with the template parsed and ready.

Throws:

ResourceNotFoundException - if template not found from any available source.

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

java.lang.Exception - if a problem in parse

getLoaderNameForResource

public java.lang.String getLoaderNameForResource(java.lang.String resourceName)

Determines is 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 ResourceManager

Parameters:

resourceName - Name of template or content resource

Returns:

class name of loader than can provide it