org.openrdf.sesame.sail.query
Class ValueCompare

java.lang.Object
  org.openrdf.sesame.sail.query.ValueCompare

All Implemented Interfaces:

BooleanExpr

public class ValueCompare

extends Object

implements BooleanExpr

A comparison between two values.

Field Summary

static int	EQ equal to
static int	GE greater than or equal to
static int	GT greater than
static int	LE lower than or equal to
static int	LT lower than
static int	NE not equal to

Constructor Summary

ValueCompare(ValueExpr leftArg, ValueExpr rightArg)

ValueCompare(ValueExpr leftArg, ValueExpr rightArg, int op)

Method Summary

ValueExpr	getLeftArg()
int	getOperator()
ValueExpr	getRightArg()
void	getVariables(Collection variables) Gets all variables that are used in this BooleanExpr.
boolean	isTrue(RdfSource rdfSource) Evaluates the boolean expression on the supplied RdfSource object.
static boolean	isTrue(Value leftVal, Value rightVal, int operator)
static String	operator2string(int op) Gives a string representation of the specified operator code.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

EQ

public static final int EQ

equal to

See Also:

Constant Field Values

NE

public static final int NE

not equal to

See Also:

Constant Field Values

LT

public static final int LT

lower than

See Also:

Constant Field Values

LE

public static final int LE

lower than or equal to

See Also:

Constant Field Values

GE

public static final int GE

greater than or equal to

See Also:

Constant Field Values

GT

public static final int GT

greater than

See Also:

Constant Field Values

Constructor Detail

ValueCompare

public ValueCompare(ValueExpr leftArg,
                    ValueExpr rightArg)

ValueCompare

public ValueCompare(ValueExpr leftArg,
                    ValueExpr rightArg,
                    int op)

Method Detail

getLeftArg

public ValueExpr getLeftArg()

getRightArg

public ValueExpr getRightArg()

getOperator

public int getOperator()

getVariables

public void getVariables(Collection variables)

Description copied from interface: BooleanExpr

Gets all variables that are used in this BooleanExpr.

Specified by:

getVariables in interface BooleanExpr

Parameters:

variables - A Collection to add the Var objects to.

isTrue

public boolean isTrue(RdfSource rdfSource)
               throws BooleanExprEvaluationException

Description copied from interface: BooleanExpr

Evaluates the boolean expression on the supplied RdfSource object.

Specified by:

isTrue in interface BooleanExpr

Parameters:

rdfSource - The RdfSource to evaluate the boolean expression against.

Returns:

the result of the evaluation.

Throws:

BooleanExprEvaluationException - If the boolean expression could not be evaluated, for example when comparing two incompatible operands. When thrown, the result of the boolean expression is neither true or false, but unknown.

isTrue

public static boolean isTrue(Value leftVal,
                             Value rightVal,
                             int operator)
                      throws BooleanExprEvaluationException

Throws:

BooleanExprEvaluationException

operator2string

public static String operator2string(int op)

Gives a string representation of the specified operator code.

Parameters:

op - One of Compare.EQ, Compare.NE, ValueCompare.LT, ValueCompare.LE, ValueCompare.GE or ValueCompare.GT.

Throws:

IllegalArgumentException - If the specified operator code is an illegal code.

toString

public String toString()