The Java interface is still rather experimental and is still likely to change somewhat.
This is not automatically built or installed at present since this interface may not be required. You can easily build it by hand as follows
cd java make build-java make test-java # optional # might need to run the test code like this: LD_LIBRARY_PATH=. java -classpath . test
To install it system wide, you will have to copy the
redland-java.jar
file to somewhere in your java CLASSPATH
and the shared library
libredland-java.so
to somewhere
in your dynamic library load path such as /usr/lib or /usr/local/lib.
This varies between systems.
The Redland Java interface has been tested with J2SDK 1.3.1 and J2SDK 1.4.1_01 on Linux/x86 only. It will need customising for different operating systems since the shared library creation has been hard-coded for Linux. (This in particular will be hard to make portable).
There is the beginnings of an example program in example.java which is mostly for reading (along with the tes1.java) but can be compiled and run with:
make example # the following asssumes you have done 'make install' for Redland java -classpath .:redland-java.jar example
The Java API is an object-based API reflecting the same structure of the Redland objects with simple mappings between them:
Concept | Redland Class | Java Class | Purpose |
---|---|---|---|
Resource / Literal | librdf_node | org.librdf.redland.Node | RDF Model & Syntax nodes |
Statement / Triple | librdf_statement | org.librdf.redland.Statement | RDF Model & Syntax arcs (statements, triples) [isa Resource] |
Model | librdf_model | org.librdf.redland.Model | Set of Statements usually held in one Storage. |
Storage | librdf_storage | org.librdf.redland.Storage | Storage for Models either persistant or in-memory. |
Stream | librdf_stream | org.librdf.redland.Stream | Providing sequences of Statements from Parsers, queries. |
Parser | librdf_parser | org.librdf.redland.Parser | Syntax parsers delivering Stream of Statements or writing to a Model |
Serializer | librdf_serializer | org.librdf.redland.Serializer | Serialize Models into various syntaxes such as RDF/XML. |
Iterator | librdf_iterator | org.librdf.redland.Iterator | Enumerating lists (of Node) from queries. |
URI | librdf_uri | org.librdf.redland.URI | Provides URIs for Resources, Parsers, ... |
World | org.librdf.redland.World | RDF wrapper class handling Redland startup/shutdown | |
Digest | librdf_digest | Internal content digest class | |
Hash | librdf_hash | Internal key:value maps class | |
List | librdf_list | Internal list class |
The follow are useful pure-Java applications (no C library)
Copyright 2001-2002 Dave Beckett, Institute for Learning and Research Technology, University of Bristol