Package org.eclipse.rdf4j.sparqlbuilder.core

Class PrefixDeclarations

java.lang.Object

org.eclipse.rdf4j.sparqlbuilder.core.QueryElementCollection<Prefix>

org.eclipse.rdf4j.sparqlbuilder.core.StandardQueryElementCollection<Prefix>

org.eclipse.rdf4j.sparqlbuilder.core.PrefixDeclarations

All Implemented Interfaces:

QueryElement

public class PrefixDeclarations
extends StandardQueryElementCollection<Prefix>

A collection of SPARQL Prefix declarations

See Also:

• SPARQL Prefix

Field Summary

Fields inherited from class org.eclipse.rdf4j.sparqlbuilder.core.QueryElementCollection

elements

Constructor Summary

Constructors

Constructor	Description
PrefixDeclarations()

Method Summary

Modifier and Type	Method	Description
PrefixDeclarations	addPrefix(Prefix... prefixes)	Add prefix declarations to this collection
String	replacePrefixesInQuery(String queryString)	Replaces all occurrences of all declared namespaces with their prefix labels in the specified query string.

Methods inherited from class org.eclipse.rdf4j.sparqlbuilder.core.StandardQueryElementCollection

getQueryString, printBodyIfEmpty, printNameIfEmpty, resetWrapperMethod, setOperatorName, setOperatorName, setWrapperMethod

Methods inherited from class org.eclipse.rdf4j.sparqlbuilder.core.QueryElementCollection

addElements, addElements, isEmpty

Methods inherited from class java.lang.Object

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

Constructor Details

PrefixDeclarations

public PrefixDeclarations()

Method Details

addPrefix

public PrefixDeclarations addPrefix(Prefix... prefixes)

Add prefix declarations to this collection

Parameters:

prefixes - the prefixes

Returns:

this

replacePrefixesInQuery

public String replacePrefixesInQuery(String queryString)

Replaces all occurrences of all declared namespaces with their prefix labels in the specified query string.

For example, if the foaf: prefix is declared with PrefixDeclarations, the query

 SELECT ?name WHERE {
   ?x <http://xmlns.com/foaf/0.1/name> ?name .
 }
 

is transformed to

 SELECT ?name WHERE {
   ?x foaf:name ?name .
 }
 

Rules applied:

• The longest matching namespace wins (if one namespace is a substring of another)
• No replacement if the namespace occurs in a string, i.e., within " or '''
• Only replace if the continuation of the match is a local name (

Parameters:

queryString - the query string

Returns:

the query string, namespaces replaced with prefix label