org.jfree.resourceloader

Interface ResourceLoader

public interface ResourceLoader

A resource loader knows how to get binary rawdata from a location specified by an resource key. A resource key is a wrapper around any kind of data that is suitable to identify a resource location. The resource key can also hold configuration data for the factory. If the storage system is hierarchical, a new resource key can be derived from a given path-string.
Author:
Thomas Morgner

Method Summary

ResourceKey
createKey(Object value, Map factoryKeys)
Creates a new resource key from the given object and the factory keys.
ResourceKey
deriveKey(ResourceKey parent, String path, 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.
ResourceData
load(ResourceKey key)
Loads the binary data represented by this key.
void
setResourceManager(ResourceManager manager)
URL
toURL(ResourceKey key)

Method Details

createKey

public ResourceKey createKey(Object value,
                             Map factoryKeys)
            throws ResourceKeyCreationException
Creates a new resource key from the given object and the factory keys.
Parameters:
value -
factoryKeys -
Returns:
the created key or null, if the format was not recognized.
Throws:
ResourceKeyCreationException - if creating the key failed.

deriveKey

public ResourceKey deriveKey(ResourceKey parent,
                             String path,
                             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.

isSupportedKey

public boolean isSupportedKey(ResourceKey key)
Checks, whether this resource loader implementation was responsible for creating this key.
Parameters:
key -
Returns:

load

public ResourceData load(ResourceKey key)
            throws ResourceLoadingException
Loads the binary data represented by this key.
Parameters:
key -
Returns:

setResourceManager

public void setResourceManager(ResourceManager manager)

toURL

public URL toURL(ResourceKey key)