org.aksw.limes.core.io.serializer

Class NtSerializer

java.lang.Object

org.aksw.limes.core.io.serializer.NtSerializer

All Implemented Interfaces:

ISerializer

Direct Known Subclasses:

TabSeparatedSerializer

public class NtSerializer
extends Object
implements ISerializer

Implements a simple serializer that generates NTriple files.

Version:

Nov 25, 2015

Author:

Axel-C. Ngonga Ngomo (ngonga@informatik.uni-leipzig.de), Mohamed Sherif (sherif@informatik.uni-leipzig.de)

Field Summary

Fields

Modifier and Type	Field and Description
protected File	folder
protected Map<String,String>	prefixMap
protected Set<String>	statements
protected PrintWriter	writer

Constructor Summary

Constructors

Constructor and Description
NtSerializer()
NtSerializer(HashMap<String,String> prefixes)

Method Summary

Modifier and Type	Method and Description
void	addStatement(String subject, String predicate, String object, double similarity) Adds a triple to the buffer of the serializer.
boolean	close() Closes the output file
static String	expand(String s, String predicate) Expands a string by replacing a prefix by its full value
void	flush()
File	getFile(String fileName) Method to open the file with the specific name
String	getFileExtension()
String	getName()
boolean	open(String file) Opens the output file
void	printPrefixes(Map<String,String> prefixMap, String file) Method to print prefixes: "@prefix key: url ."
void	printStatement(String subject, String predicate, String object, double similarity) Writes in the file statement by statement.
void	setFolderPath(File folder) Method to set the folder where Serializations should be saved to.
void	setPrefixes(Map<String,String> prefixes) Sets the prefixes to be used in the file.
void	writeToFile(AMapping mapping, String predicate, String file) Gets a mapping and serializes it to a file in the N3 format.

Methods inherited from class java.lang.Object

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

Field Detail

writer

protected PrintWriter writer

statements

protected Set<String> statements

prefixMap

protected Map<String,String> prefixMap

folder

protected File folder

Constructor Detail

NtSerializer

public NtSerializer()

NtSerializer

public NtSerializer(HashMap<String,String> prefixes)

Method Detail

expand

public static String expand(String s,
                            String predicate)

Expands a string by replacing a prefix by its full value

Parameters:

s - Input string

predicate - Predicate to expand with

Returns:

Expanded version of s

addStatement

public void addStatement(String subject,
                         String predicate,
                         String object,
                         double similarity)

Description copied from interface: ISerializer

Adds a triple to the buffer of the serializer. Requires the method open to have been carried out

Specified by:

addStatement in interface ISerializer

Parameters:

subject - The subject of the triple

predicate - The predicate of the triple

object - The object of the triple

similarity - value

flush

public void flush()

writeToFile

public void writeToFile(AMapping mapping,
                        String predicate,
                        String file)

Gets a mapping and serializes it to a file in the N3 format. The method assume that the class already knows all the prefixes used in the uris and expands those.

Specified by:

writeToFile in interface ISerializer

Parameters:

mapping - Mapping to serialize

predicate - Predicate to use while serializing

file - File in which the mapping is to be serialized

printStatement

public void printStatement(String subject,
                           String predicate,
                           String object,
                           double similarity)

Writes in the file statement by statement. Rather slow, not to be used

Specified by:

printStatement in interface ISerializer

Parameters:

subject - Source object of a mapping, subject of the triple to be written

predicate - Predicate to be written

object - Target object of a mapping, object of the triple to be written

similarity - Similarity achieved by the subject and object

printPrefixes

public void printPrefixes(Map<String,String> prefixMap,
                          String file)

Method to print prefixes: "@prefix key: url ."

Parameters:

prefixMap - to be printed

file - file name

close

public boolean close()

Description copied from interface: ISerializer

Closes the output file

Specified by:

close in interface ISerializer

Returns:

true if the file was closed successfully, else false

open

public boolean open(String file)

Description copied from interface: ISerializer

Opens the output file

Specified by:

open in interface ISerializer

Parameters:

file - Path to the file in which the output is to be written

Returns:

true if opening was carried out successfully, else false.

getName

public String getName()

Specified by:

getName in interface ISerializer

Returns:

name

setPrefixes

public void setPrefixes(Map<String,String> prefixes)

Description copied from interface: ISerializer

Sets the prefixes to be used in the file.

Specified by:

setPrefixes in interface ISerializer

Parameters:

prefixes - List of prefixes to use

getFileExtension

public String getFileExtension()

Specified by:

getFileExtension in interface ISerializer

Returns:

file extension

getFile

public File getFile(String fileName)

Description copied from interface: ISerializer

Method to open the file with the specific name

Specified by:

getFile in interface ISerializer

Parameters:

fileName - string

Returns:

file instance

setFolderPath

public void setFolderPath(File folder)

Description copied from interface: ISerializer

Method to set the folder where Serializations should be saved to.

Specified by:

setFolderPath in interface ISerializer

Parameters:

folder - File which points to the folder to serialize within.