Class FilterUtils

java.lang.Object

org.eclipse.rdf4j.federated.util.FilterUtils

public class FilterUtils
extends Object

Various utility functions to handle filter expressions. NOTE: currently only implemented for Compare, other filter expressions need to be added. If an unexpected filter expression occurs, the filter evaluation is done locally.

Author:

Andreas Schwarte

Constructor Summary

Constructors

Constructor	Description
FilterUtils()

Method Summary

Modifier and Type	Method	Description
protected static void	append(Compare cmp, StringBuilder sb)
protected static void	append(ValueConstant vc, StringBuilder sb)
protected static void	append(ValueExpr expr, StringBuilder sb)
protected static void	append(Var var, StringBuilder sb)
protected static StringBuilder	appendLiteral(StringBuilder sb, Literal lit)
protected static StringBuilder	appendURI(StringBuilder sb, IRI uri)
protected static StringBuilder	appendValue(StringBuilder sb, Value value)
static ValueExpr	toFilter(ConjunctiveFilterExpr filterExpr)
static ValueExpr	toFilter(FilterExpr filterExpr)
static ValueExpr	toFilter(FilterValueExpr filterExpr)
static String	toSparqlString(ConjunctiveFilterExpr filterExpr)
static String	toSparqlString(FilterExpr filterExpr)
static String	toSparqlString(FilterValueExpr filterExpr)	Returns a SPARQL representation of the provided expression, e.g Compare(?

Methods inherited from class Object

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

Constructor Details

FilterUtils

public FilterUtils()

Method Details

toSparqlString

public static String toSparqlString(FilterValueExpr filterExpr)
                             throws FilterConversionException

Returns a SPARQL representation of the provided expression, e.g Compare(?v, "invalid input: '<'", 3) is converted to "?v invalid input: '<' '3'"

Parameters:

filterExpr -

Returns:

the SPARQL string

Throws:

FilterConversionException

toSparqlString

public static String toSparqlString(FilterExpr filterExpr)
                             throws FilterConversionException

Throws:

FilterConversionException

toSparqlString

public static String toSparqlString(ConjunctiveFilterExpr filterExpr)
                             throws FilterConversionException

Throws:

FilterConversionException

toFilter

public static ValueExpr toFilter(FilterValueExpr filterExpr)
                          throws FilterConversionException

Throws:

FilterConversionException

toFilter

public static ValueExpr toFilter(FilterExpr filterExpr)
                          throws FilterConversionException

Throws:

FilterConversionException

toFilter

public static ValueExpr toFilter(ConjunctiveFilterExpr filterExpr)
                          throws FilterConversionException

Throws:

FilterConversionException

append

protected static void append(ValueExpr expr,
 StringBuilder sb)
                      throws FilterConversionException

Throws:

FilterConversionException

append

protected static void append(Compare cmp,
 StringBuilder sb)
                      throws FilterConversionException

Throws:

FilterConversionException

append

protected static void append(Var var,
 StringBuilder sb)

append

protected static void append(ValueConstant vc,
 StringBuilder sb)

appendValue

protected static StringBuilder appendValue(StringBuilder sb,
 Value value)

appendURI

protected static StringBuilder appendURI(StringBuilder sb,
 IRI uri)

appendLiteral

protected static StringBuilder appendLiteral(StringBuilder sb,
 Literal lit)