com.epimorphics.lda.support

Class PrefixLogger

java.lang.Object

com.epimorphics.lda.support.PrefixLogger

public class PrefixLogger
extends Object

Prefix mapping

Field Summary

Fields

Modifier and Type	Field and Description
static Pattern	candidatePrefix A pattern that will match candidate prefixes, which will then be checked against the provided prefix mapping.
protected com.hp.hpl.jena.shared.PrefixMapping	pm
protected Set<String>	seen

Constructor Summary

Constructors

Constructor and Description
PrefixLogger()
PrefixLogger(com.hp.hpl.jena.shared.PrefixMapping pm)

Method Summary

Methods

Modifier and Type	Method and Description
void	findPrefixesIn(String fragment) Look for plausible candidates for prefixes in the SPARQL fragment and add them to seen.
com.hp.hpl.jena.shared.PrefixMapping	getPrefixMapping() PrefixMapping is required by extension queries
String	present(Any r)
String	present(String unsafeURI) Present a URI as a SPARQL term, either <>-quoted, or as a qname if there's a suitable prefix mapping for it.
static PrefixLogger	some() Answer a new PrefixLoggger with a few standard prefixes in it.
StringBuilder	writePrefixes(StringBuilder out) Write out the used prefixes as SPARQL prefix declarations into the StringBuilder out.

Methods inherited from class java.lang.Object

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

Field Detail

pm

protected final com.hp.hpl.jena.shared.PrefixMapping pm

seen

protected final Set<String> seen

candidatePrefix

public static final Pattern candidatePrefix

A pattern that will match candidate prefixes, which will then be checked against the provided prefix mapping. Note that it does not matter if the pattern is over-generous in matching so long as it does not miss any prefixes. Hence, it is not necessary to check for comments or strings.

Constructor Detail

PrefixLogger

public PrefixLogger(com.hp.hpl.jena.shared.PrefixMapping pm)

PrefixLogger

public PrefixLogger()

Method Detail

present

public String present(String unsafeURI)

Present a URI as a SPARQL term, either <>-quoted, or as a qname if there's a suitable prefix mapping for it.

SPARQL qname local names can't end with ".", so we protect against generating illegal SPARQL by an ad-hoc check against the URL ending with dot. May need to consider other characters too, and may want to push this protection into Jena.

present

public String present(Any r)

writePrefixes

public StringBuilder writePrefixes(StringBuilder out)

Write out the used prefixes as SPARQL prefix declarations into the StringBuilder out. Answer that same StringBuilder.

findPrefixesIn

public void findPrefixesIn(String fragment)

Look for plausible candidates for prefixes in the SPARQL fragment and add them to seen.

some

public static PrefixLogger some()

Answer a new PrefixLoggger with a few standard prefixes in it.

getPrefixMapping

public com.hp.hpl.jena.shared.PrefixMapping getPrefixMapping()

PrefixMapping is required by extension queries