org.openrdf.sesame.query.rql.model
Class CompareTo

java.lang.Object
  org.openrdf.sesame.query.rql.model.CompareTo

All Implemented Interfaces:

BooleanQuery, Query

public class CompareTo

extends Object

implements BooleanQuery

Comparison operators on various types of operands.

Field Summary

static int	EQ EQual *
static int	GE Larger or Equal *
static int	GT Larger Than *
static int	LE Lower or Equal *
static int	LT Lower Than *
static int	NE Not Equal *

Constructor Summary

CompareTo(ResourceQuery arg1, int op, ResourceQuery arg2)

Method Summary

ResourceQuery	getArg1()
ResourceQuery	getArg2()
int	getOperator()
String	getQuery()
boolean	isTrue(RdfSchemaSource rss) Determines what the boolean value of the comparison operator is.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LT

public static final int LT

Lower Than *

See Also:

Constant Field Values

LE

public static final int LE

Lower or Equal *

See Also:

Constant Field Values

EQ

public static final int EQ

EQual *

See Also:

Constant Field Values

GE

public static final int GE

Larger or Equal *

See Also:

Constant Field Values

GT

public static final int GT

Larger Than *

See Also:

Constant Field Values

NE

public static final int NE

Not Equal *

See Also:

Constant Field Values

Constructor Detail

CompareTo

public CompareTo(ResourceQuery arg1,
                 int op,
                 ResourceQuery arg2)

Method Detail

getArg1

public ResourceQuery getArg1()

getArg2

public ResourceQuery getArg2()

getOperator

public int getOperator()

isTrue

public boolean isTrue(RdfSchemaSource rss)
               throws QueryEvaluationException

Determines what the boolean value of the comparison operator is. Possible comparisons are <, <=, =, >, >=, !=. When incompatible datatypes are compared, all comparisons (except !=) evaluate to false.

Specified by:

isTrue in interface BooleanQuery

Parameters:

rss - the repository abstraction layer on which the query needs to be evaluated.

Returns:

true when the selected comparison operator evaluates to true,false otherwise.

Throws:

QueryEvaluationException - is thrown when the comparison is between a set and a single element, or when a variable has no assigned value.

getQuery

public String getQuery()

Specified by:

getQuery in interface Query

toString

public String toString()