com.epimorphics.lda.support

Class QuerySupport

java.lang.Object

com.epimorphics.lda.support.QuerySupport

public class QuerySupport
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static Any	text_query

Constructor Summary

Constructors

Constructor and Description
QuerySupport()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	canPromoteSubject(Any S)
static List<RDFQ.Triple>	reorder(List<RDFQ.Triple> triples, boolean tqFirst) Reorder the given triples to try and arrange that query engines with weak optimisers aren't given excessively silly queries.

Methods inherited from class java.lang.Object

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

Field Detail

text_query

public static final Any text_query

Constructor Detail

QuerySupport

public QuerySupport()

Method Detail

reorder

public static List<RDFQ.Triple> reorder(List<RDFQ.Triple> triples,
                        boolean tqFirst)

Reorder the given triples to try and arrange that query engines with weak optimisers aren't given excessively silly queries. So rdf:type statements (which are usually less useful than specific properties) are moved down the order, and triples with literal objects (which often only appear a few times) are moved up. All optional triples are moved to the end regardless of their structure.

Uses of the text query property are pushed early if tqFirst is true, and later (just before the types) if it is false.

Parameters:

triples - the list of triples to re-order.

Returns:

a fresh list of triples, a reordered version of triples.

canPromoteSubject

public static boolean canPromoteSubject(Any S)