Module org.apache.jena.core

Package org.apache.jena.util

Class FileManagerImpl

java.lang.Object

org.apache.jena.util.FileManagerImpl

All Implemented Interfaces:

FileManager

public class FileManagerImpl
extends Object
implements FileManager

FileManager A FileManager provides access to named file-like resources by opening InputStreams to things in the filing system, by URL (http: and file:) and found by the classloader. It can also load RDF data from such a system resource into an existing model or create a new (Memory-based) model. There is a global FileManager which provide uniform access to system resources: applications may also create specialised FileManagers. A FileManager contains a list of location functions to try: the global FileManger has one LocatorFile, one LocatorClassLoader and one LocatorURL Main operations: *

• loadModel, readModel : URI to model
• open, openNoMap : URI to input stream
• mapURI : map URI to another by LocationMapper

Utilities:

• readWholeFileAsUTF8
• optional caching of models

A FileManager works in conjunction with a LocationMapper. A LocationMapper is a set of alternative locations for system resources and a set of alternative prefix locations. For example, a local copy of a common RDF dataset may be used whenever the usual URL is used by the application. The LocatorFile also supports the idea of "current directory".

See Also:

• LocationMapper
• FileUtils

Field Summary

Fields inherited from interface org.apache.jena.util.FileManager

filePathSeparator, logAllLookups, PATH_DELIMITER

Method Summary

Modifier and Type	Method	Description
void	addCacheModel(String uri, Model m)
void	addLocator(Locator loc)	Add a locator to the end of the locators list
void	addLocatorClassLoader(ClassLoader cLoad)	Deprecated.
void	addLocatorFile()	Deprecated.
void	addLocatorFile(String dir)	Deprecated.
void	addLocatorURL()	Deprecated.
void	addLocatorZip(String zfn)	Deprecated.
FileManager	clone()
static FileManager	get()	Get the global file manager.
Model	getFromCache(String filenameOrURI)	Read out of the cache - return null if not in the cache
LocationMapper	getLocationMapper()	Get the location mapping
boolean	hasCachedModel(String filenameOrURI)
boolean	isCachingModels()	return whether caching is on of off
Model	loadModelInternal(String filenameOrURI)	Load a model from a file (local or remote).
Iterator<Locator>	locators()	Return an iterator over all the handlers
static FileManager	makeGlobal()	Create a "standard" FileManager.
String	mapURI(String filenameOrURI)	Apply the mapping of a filename or URI
InputStream	open(String filenameOrURI)	Open a file using the locators of this FileManager
InputStream	openNoMap(String filenameOrURI)	Open a file using the locators of this FileManager but without location mapping
TypedStream	openNoMapOrNull(String filenameOrURI)	Open a file using the locators of this FileManager but without location mapping.
Model	readModelInternal(Model model, String filenameOrURI)	Read a file of RDF into a model.
String	readWholeFileAsUTF8(InputStream in)	Slurp up a whole file
String	readWholeFileAsUTF8(String filename)	Slurp up a whole file: map filename as necessary
void	remove(Locator loc)	Remove a locator
void	removeCacheModel(String uri)
void	resetCache()	Reset the model cache
static void	setGlobalFileManager(FileManager globalFileManager)	Set the global file manager (as returned by get()) If called before any call to get(), then the usual default filemanager is not created
void	setLocationMapper(LocationMapper _mapper)	Set the location mapping
void	setModelCaching(boolean state)	Change the state of model cache : does not clear the cache

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.util.FileManager

loadModel, readModel

Method Details

get

public static FileManager get()

Get the global file manager.

Returns:

the global file manager

setGlobalFileManager

public static void setGlobalFileManager(FileManager globalFileManager)

Set the global file manager (as returned by get()) If called before any call to get(), then the usual default filemanager is not created

Parameters:

globalFileManager -

clone

public FileManager clone()

Specified by:

clone in interface FileManager

makeGlobal

public static FileManager makeGlobal()

Create a "standard" FileManager.

setLocationMapper

public void setLocationMapper(LocationMapper _mapper)

Set the location mapping

Specified by:

setLocationMapper in interface FileManager

getLocationMapper

public LocationMapper getLocationMapper()

Get the location mapping

Specified by:

getLocationMapper in interface FileManager

locators

public Iterator<Locator> locators()

Return an iterator over all the handlers

Specified by:

locators in interface FileManager

addLocator

public void addLocator(Locator loc)

Add a locator to the end of the locators list

Specified by:

addLocator in interface FileManager

addLocatorFile

@Deprecated
public void addLocatorFile()

Deprecated.

Add a file locator

Specified by:

addLocatorFile in interface FileManager

addLocatorFile

@Deprecated
public void addLocatorFile(String dir)

Deprecated.

Add a file locator which uses dir as its working directory

Specified by:

addLocatorFile in interface FileManager

addLocatorClassLoader

@Deprecated
public void addLocatorClassLoader(ClassLoader cLoad)

Deprecated.

Add a class loader locator

Specified by:

addLocatorClassLoader in interface FileManager

addLocatorURL

@Deprecated
public void addLocatorURL()

Deprecated.

Add a URL locator

Specified by:

addLocatorURL in interface FileManager

addLocatorZip

@Deprecated
public void addLocatorZip(String zfn)

Deprecated.

Add a zip file locator

Specified by:

addLocatorZip in interface FileManager

remove

public void remove(Locator loc)

Remove a locator

Specified by:

remove in interface FileManager

resetCache

public void resetCache()

Reset the model cache

Specified by:

resetCache in interface FileManager

setModelCaching

public void setModelCaching(boolean state)

Change the state of model cache : does not clear the cache

Specified by:

setModelCaching in interface FileManager

isCachingModels

public boolean isCachingModels()

return whether caching is on of off

Specified by:

isCachingModels in interface FileManager

getFromCache

public Model getFromCache(String filenameOrURI)

Read out of the cache - return null if not in the cache

Specified by:

getFromCache in interface FileManager

hasCachedModel

public boolean hasCachedModel(String filenameOrURI)

Specified by:

hasCachedModel in interface FileManager

addCacheModel

public void addCacheModel(String uri,
 Model m)

Specified by:

addCacheModel in interface FileManager

removeCacheModel

public void removeCacheModel(String uri)

Specified by:

removeCacheModel in interface FileManager

loadModelInternal

public Model loadModelInternal(String filenameOrURI)

Load a model from a file (local or remote). This operation may attempt content negotiation for http URLs.

Specified by:

loadModelInternal in interface FileManager

Parameters:

filenameOrURI - The filename or a URI (file:, http:)

Returns:

a new model

Throws:

JenaException - if there is syntax error in file.

readModelInternal

public Model readModelInternal(Model model,
 String filenameOrURI)

Read a file of RDF into a model. Guesses the syntax of the file based on filename extension, defaulting to RDF/XML.

Specified by:

readModelInternal in interface FileManager

Parameters:

model -

filenameOrURI -

Returns:

The model or null, if there was an error.

Throws:

JenaException - if there is syntax error in file.

open

public InputStream open(String filenameOrURI)

Open a file using the locators of this FileManager

Specified by:

open in interface FileManager

mapURI

public String mapURI(String filenameOrURI)

Apply the mapping of a filename or URI

Specified by:

mapURI in interface FileManager

readWholeFileAsUTF8

public String readWholeFileAsUTF8(InputStream in)

Slurp up a whole file

Specified by:

readWholeFileAsUTF8 in interface FileManager

readWholeFileAsUTF8

public String readWholeFileAsUTF8(String filename)

Slurp up a whole file: map filename as necessary

Specified by:

readWholeFileAsUTF8 in interface FileManager

openNoMap

public InputStream openNoMap(String filenameOrURI)

Open a file using the locators of this FileManager but without location mapping

Specified by:

openNoMap in interface FileManager

openNoMapOrNull

public TypedStream openNoMapOrNull(String filenameOrURI)

Open a file using the locators of this FileManager but without location mapping. Return null if not found

Specified by:

openNoMapOrNull in interface FileManager