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| <h1 class="title">Support for Internationalised Resource Identifiers in Jena</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#javadoc">Javadoc</a></li> |
| <li><a href="#minimal-documentation">Minimal Documentation</a></li> |
| </ul> |
| </nav> |
| </aside> |
| <article class="flex-column me-lg-4"> |
| <p>The Jena IRI Library is an implementation of <a href="http://www.ietf.org/rfc/rfc3987.txt">RFC 3987</a> (IRI) |
| and <a href="http://www.ietf.org/rfc/rfc3986.txt">RFC 3986</a> (URI), |
| and a partial implementation of other related standards. It is incomplete.</p> |
| <h2 id="javadoc">Javadoc</h2> |
| <p><a href="TODO">The IRI Library Javadoc (Public APIs)</a></p> |
| <p>The most important parts of the Javadoc are:</p> |
| <p><a href="TODO">ViolationCodes</a> |
| Gives the relationships between the error codes and the |
| specifications.</p> |
| <p><a href="TODO">IRI</a> |
| Gives the main interface for IRIs.</p> |
| <p><a href="TODO">IRIFactory</a> |
| Gives the main class for creating IRIs, including specifying |
| which specifications you wish to be using, and with what degree of |
| force.</p> |
| <h2 id="minimal-documentation">Minimal Documentation</h2> |
| <p>Unfortunately this version of the IRI Library has badly incomplete |
| documentation, any help in producing good documentation would be |
| appreciated.</p> |
| <p>The current version is incomplete with little indication as to |
| where. It is primarily intended to support the functionality of |
| checking strings against any of the various IRI or URI |
| specifications. Some support for different levels of checking is |
| provided.</p> |
| <p>These instructions are from a mail message on the <code>jena-dev</code> mailing |
| list.</p> |
| <pre><code>Summary: |
| ======= |
| use something like: |
| |
| import org.apache.jena.iri.*; |
| |
| static IRIFactory iriFactory = IRIFactory |
| .semanticWebImplementation(); |
| |
| ... |
| |
| boolean includeWarnings = false; |
| IRI iri; |
| iri = iriFactory.create(iriString); // always works |
| if (iri.hasViolation(includeWarnings)) { |
| // bad iri code |
| } |
| |
| ... |
| |
| Since you are taking IRI rules seriously, you may want to have |
| includeWarnings = true in the above. |
| |
| Full version |
| ============ |
| The code is found in the iri.jar, which is not particularly |
| well documented, and the source and documentation is in the |
| separate iri download, from the Jena download area. |
| |
| As shown, you start by building an IRIFactory |
| |
| org.apache.jena.iri.IRIFactory |
| |
| this embodies some set of rules, against which you will check |
| an IRI. |
| |
| The one we use is: |
| IRIFactory.jenaImplementation() |
| For use by Jena team only. |
| This method reflects the current IRI support |
| in Jena, which is a moving target at present. |
| |
| (actually it hasn't ever moved - the main issue is to do with |
| file: IRIs - we definitely want to be more liberal than a |
| conservative reading of the specs allow, because, e.g. |
| filenames with spaces in happen, and because file uris like |
| file:localFile which aren't particularly conformant, also |
| happen). |
| |
| others, that allow you to control which specs you are checking |
| against are: |
| |
| IRIFactory.iriImplementation() RFC 3987 |
| IRIFactory.uriImplementation() RFC 3986 (US-ASCII only) |
| |
| IRIFactory.semanticWebImplementation() |
| This factory is a conservative implementation |
| appropriate for Semantic Web applications. |
| |
| Having got your factory then you convert a string into an IRI |
| in one of two ways, depending on how you want to handle errors: |
| |
| e.g. |
| IRI iri; |
| try { |
| iri = iriFactory.construct{iriString); |
| } |
| catch (IRIException e) { |
| // bad iri code |
| |
| } |
| |
| |
| or |
| |
| boolean includeWarnings = false; |
| IRI iri; |
| iri = iriFactory.create{iriString); // always works |
| if (iri.hasViolation(includeWarnings)) { |
| // bad iri code |
| // e.g. |
| |
| Iterator it = iri.violations(includeWarnings); |
| while (it.hasNext()) { |
| Violation v = (Violation) it.next(); |
| // do something: printErrorMessages(v); |
| |
| } |
| } |
| |
| various warning and error conditions are listed in the java doc |
| for ViolationCodes (in the iri download). |
| An error is a MUST force statement from the spec, |
| a warning corresponds to a SHOULD force statement from the |
| spec. There is also some support for 'minting' violations, |
| which provide a stricter level of checking for |
| IRIs that you are generating, as opposed to IRIs |
| that have been passed to your application from elsewhere. |
| |
| So that, if I remember correctly: |
| |
| http://example.org:80/foo |
| |
| raises a warning with code DEFAULT_PORT_SHOULD_BE_OMITTED |
| |
| Like this one, many of the SHOULD force statements help avoid having |
| two different IRIs that have the same operational semantics. |
| |
| Each spec is implemented as some set of active error and warning |
| codes, so depending on which factory you chose in the first place, |
| you may get a different collection of spec violations, some with |
| SHOULD force and some with MUST force. |
| |
| There are also potentially warnings associated with security issues |
| like IRI spoofing, which may not strictly violate any SHOULDs |
| in any spec. |
| </code></pre> |
| |
| </article> |
| |
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