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HDT Java Core

HDT Core Library Implementation in Java

License

License
Categories

Categories

Java Languages
GroupId

GroupId

eu.wdaqua
ArtifactId

ArtifactId

hdt-java-core
Last Version

Last Version

2.1
Release Date

Release Date
Type

Type

jar
Description

Description

HDT Java Core
HDT Core Library Implementation in Java
Project Organization

Project Organization

DataWeb Research

Download hdt-java-core

Filename Size
hdt-java-core-2.1.pom
hdt-java-core-2.1.jar 233 KB
hdt-java-core-2.1-sources.jar 193 KB
hdt-java-core-2.1-javadoc.jar 792 KB
Browse

How to add to project

<!-- https://jarcasting.com/artifacts/eu.wdaqua/hdt-java-core/ -->
<dependency>
    <groupId>eu.wdaqua</groupId>
    <artifactId>hdt-java-core</artifactId>
    <version>2.1</version>
</dependency>
// https://jarcasting.com/artifacts/eu.wdaqua/hdt-java-core/
implementation 'eu.wdaqua:hdt-java-core:2.1'
// https://jarcasting.com/artifacts/eu.wdaqua/hdt-java-core/
implementation ("eu.wdaqua:hdt-java-core:2.1")
'eu.wdaqua:hdt-java-core:jar:2.1'
<dependency org="eu.wdaqua" name="hdt-java-core" rev="2.1">
  <artifact name="hdt-java-core" type="jar" />
</dependency>
@Grapes(
@Grab(group='eu.wdaqua', module='hdt-java-core', version='2.1')
)
libraryDependencies += "eu.wdaqua" % "hdt-java-core" % "2.1"
[eu.wdaqua/hdt-java-core "2.1"]

Dependencies

compile (7)

Group / Artifact Type Version
org.apache.jena : jena-arq jar 3.2.0
eu.wdaqua : hdt-api jar 2.1
org.apache.commons : commons-compress jar 1.12
org.apache.jena : jena-core jar 3.2.0
org.apache.jena : jena-base jar 3.2.0
pl.edu.icm : JLargeArrays jar 1.6
org.tukaani : xz jar 1.6

test (2)

Group / Artifact Type Version
junit : junit jar 4.12
pl.pragmatists : JUnitParams jar 1.0.5

Project Modules

There are no modules declared in this project.

Join the chat at https://gitter.im/rdfhdt

HDT Library, Java Implementation. http://www.rdfhdt.org

Overview

HDT-lib is a Java Library that implements the W3C Submission (http://www.w3.org/Submission/2011/03/) of the RDF HDT (Header-Dictionary-Triples) binary format for publishing and exchanging RDF data at large scale. Its compact representation allows storing RDF in fewer space, providing at the same time direct access to the stored information. This is achieved by depicting the RDF graph in terms of three main components: Header, Dictionary and Triples. The Header includes extensible metadata required to describe the RDF data set and details of its internals. The Dictionary organizes the vocabulary of strings present in the RDF graph by assigning numerical IDs to each different string. The Triples component comprises the internal structure of the RDF graph in a compressed form.

It provides several components:

  • hdt-java-api: Abstract interface for dealing with HDT files.
  • hdt-java-core: Core library for accessing HDT files programmatically from java. It allows creating HDT files from RDF and converting HDT files back to RDF. It also provides a Search interface to find triples that match a specific triple pattern.
  • hdt-java-cli: Commandline tools to convert RDF to HDT, merge two HDT files and access HDT files from a terminal.
  • hdt-jena: Jena integration. Provides a Jena Graph implementation that allows accessing HDT files as normal Jena Models. In turn, this can be used with Jena ARQ to provide more advanced searches, such as SPARQL, and even setting up SPARQL Endpoints with Fuseki.
  • hdt-java-package: Generates a package with all the components and launcher scripts.
  • hdt-fuseki: Packages Apache Jena Fuseki with the HDT jars and a fast launcher, to start a SPARQL endpoint out of HDT files very easily.

Compiling

Use mvn install to let Apache Maven install the required jars in your system.

You can also run mvn assembly:single under hdt-java-package to generate a distribution directory with all the jars and launcher scripts.

Usage

Please refer to hdt-java-package/README for more information on how to use the library. You can also find useful information on our Web Page http://www.rdfhdt.org

License

Each module has a different License. Core is LGPL, examples and tools are Apache.

  • hdt-api: Apache License
  • hdt-java-cli: (Commandline tools and examples): Apache License
  • hdt-java-core: Lesser General Public License
  • hdt-jena: Lesser General Public License
  • hdt-fuseki: Apache License

Authors

Acknowledgements

RDF/HDT is a project developed by the Insight Centre for Data Analytics (www.insight-centre.org), University of Valladolid (www.uva.es), University of Chile (www.uchile.cl). Funded by Science Foundation Ireland: Grant No. SFI/08/CE/I1380, Lion-II; the Spanish Ministry of Economy and Competitiveness (TIN2009-14009-C02-02); Chilean Fondecyt's 1110287 and 1-110066; and the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 642795.

eu.wdaqua

RDF/HDT Compressed RDF Tools

Versions

Version
2.1
2.0