org.pentaho.reporting.libraries.resourceloader
Interface ResourceBundleLoader

public interface ResourceBundleLoader

A resource bundle is a compound archive that holds several resources.

Author:

Thomas Morgner

Method Summary

ResourceKey	deriveKey(ResourceKey parent, java.lang.String path, java.util.Map factoryKeys) Derives a new resource key from the given key.
boolean	isSupportedKey(ResourceKey key) Checks, whether this resource loader implementation was responsible for creating this key.
ResourceBundleData	loadBundle(ResourceManager resourceManager, ResourceKey key) Tries to load the bundle.

Method Detail

loadBundle

ResourceBundleData loadBundle(ResourceManager resourceManager,
                              ResourceKey key)
                              throws ResourceLoadingException

Tries to load the bundle. If the key does not point to a usable resource-bundle, this method returns null. The Exception is only thrown if the bundle is not readable because of IO-Errors.

A resource-bundle loader should only load the bundle for the key itself, never for any of the derived subkeys. It is the ResourceManager's responsibility to search the key's hierachy for the correct key.

Parameters:

key - the resource key pointing to the bundle.

Returns:

the loaded bundle or null, if the resource was not understood.

Throws:

ResourceLoadingException - if something goes wrong.

isSupportedKey

boolean isSupportedKey(ResourceKey key)

Checks, whether this resource loader implementation was responsible for creating this key.

Parameters:

key - the key that should be tested.

Returns:

true, if the key is supported.

deriveKey

ResourceKey deriveKey(ResourceKey parent,
                      java.lang.String path,
                      java.util.Map factoryKeys)
                      throws ResourceKeyCreationException

Derives a new resource key from the given key. If neither a path nor new factory-keys are given, the parent key is returned.

Parameters:

parent - the parent

path - the derived path (can be null).

factoryKeys - the optional factory keys (can be null).

Returns:

the derived key.

Throws:

ResourceKeyCreationException - if the key cannot be derived for any reason.