com.hp.hpl.jena.sparql.expr
Interface Expr

All Known Implementing Classes:

E_Add, E_BNode, E_Bound, E_Call, E_Cast, E_Coalesce, E_Conditional, E_Datatype, E_DateTimeDay, E_DateTimeHours, E_DateTimeMinutes, E_DateTimeMonth, E_DateTimeSeconds, E_DateTimeTimezone, E_DateTimeTZ, E_DateTimeYear, E_Divide, E_Equals, E_Exists, E_Function, E_FunctionDynamic, E_GreaterThan, E_GreaterThanOrEqual, E_IRI, E_IsBlank, E_IsIRI, E_IsLiteral, E_IsNumeric, E_IsURI, E_Lang, E_LangMatches, E_LessThan, E_LessThanOrEqual, E_LogicalAnd, E_LogicalNot, E_LogicalOr, E_MD5, E_Multiply, E_NotEquals, E_NotExists, E_NotOneOf, E_Now, E_NumAbs, E_NumCeiling, E_NumFloor, E_NumRound, E_OneOf, E_OneOfBase, E_Random, E_Regex, E_SameTerm, E_SHA1, E_SHA224, E_SHA256, E_SHA384, E_SHA512, E_Str, E_StrAfter, E_StrBefore, E_StrConcat, E_StrContains, E_StrDatatype, E_StrEncodeForURI, E_StrEndsWith, E_StrLang, E_StrLength, E_StrLowerCase, E_StrReplace, E_StrStartsWith, E_StrSubstring, E_StrUpperCase, E_StrUUID, E_Subtract, E_UnaryMinus, E_UnaryPlus, E_URI, E_UUID, E_Version, ExprAggregator, ExprDigest, ExprFunction, ExprFunction0, ExprFunction1, ExprFunction2, ExprFunction3, ExprFunctionN, ExprFunctionOp, ExprNode, ExprSystem, ExprVar, NodeValue, NodeValueBoolean, NodeValueDecimal, NodeValueDouble, NodeValueDT, NodeValueDuration, NodeValueFloat, NodeValueInteger, NodeValueNode, NodeValueString

public interface Expr

Field Summary

static int	CMP_EQUAL
static int	CMP_GREATER
static int	CMP_INDETERMINATE
static int	CMP_LESS
static int	CMP_UNEQUAL

Method Summary

Expr	applyNodeTransform(NodeTransform transform) Rewrite, applying a node->node transformation
Var	asVar() Convert to a Var variable.
Expr	copySubstitute(Binding binding) Deep copy with substitution
Expr	copySubstitute(Binding binding, boolean foldConstants) Deprecated. See ExprTransformConstantFold for constant folding.
Expr	deepCopy() Deep copy
NodeValue	eval(Binding binding, FunctionEnv env) Evaluate this expression against the binding
NodeValue	getConstant() NodeValue constant (returns null if not a constant)
ExprVar	getExprVar() Variable (or null)
ExprFunction	getFunction() Get the function (returns null if not a function)
String	getVarName() Variable name (returns null if not a variable)
Set<Var>	getVarsMentioned() Variables used by this expression - excludes variables scoped to (NOT)EXISTS
boolean	isConstant() Answer whether this is a constant expression - false includes "don't know" No constant folding so "false" from an expression that evaluates to a constant
boolean	isFunction() Answer wether this is a function.
boolean	isSatisfied(Binding binding, FunctionEnv execCxt) Test whether a Constraint is satisfied, given a set of bindings Includes error propagtion and Effective Boolean Value rules.
boolean	isVariable() Answer whether this is a variable (in which case getVarName and getNodeVar can be called)
void	varsMentioned(Collection<Var> acc) Variables used by this expression - excludes variables scoped to (NOT)EXISTS
void	visit(ExprVisitor visitor)

Field Detail

CMP_GREATER

static final int CMP_GREATER

See Also:

Constant Field Values

CMP_EQUAL

static final int CMP_EQUAL

See Also:

Constant Field Values

CMP_LESS

static final int CMP_LESS

See Also:

Constant Field Values

CMP_UNEQUAL

static final int CMP_UNEQUAL

See Also:

Constant Field Values

CMP_INDETERMINATE

static final int CMP_INDETERMINATE

See Also:

Constant Field Values

Method Detail

isSatisfied

boolean isSatisfied(Binding binding,
                    FunctionEnv execCxt)

Test whether a Constraint is satisfied, given a set of bindings Includes error propagtion and Effective Boolean Value rules.

Parameters:

binding - The bindings

execCxt - FunctionEnv

Returns:

true or false

getVarsMentioned

Set<Var> getVarsMentioned()

Variables used by this expression - excludes variables scoped to (NOT)EXISTS

varsMentioned

void varsMentioned(Collection<Var> acc)

Variables used by this expression - excludes variables scoped to (NOT)EXISTS

eval

NodeValue eval(Binding binding,
               FunctionEnv env)

Evaluate this expression against the binding

Parameters:

binding -

env -

copySubstitute

Expr copySubstitute(Binding binding)

Deep copy with substitution

copySubstitute

@Deprecated
Expr copySubstitute(Binding binding,
                               boolean foldConstants)

Deprecated. See ExprTransformConstantFold for constant folding.

Deep copy with substitution, possibly collapsing constant sub-expressions.

applyNodeTransform

Expr applyNodeTransform(NodeTransform transform)

Rewrite, applying a node->node transformation

deepCopy

Expr deepCopy()

Deep copy

isVariable

boolean isVariable()

Answer whether this is a variable (in which case getVarName and getNodeVar can be called)

getVarName

String getVarName()

Variable name (returns null if not a variable)

getExprVar

ExprVar getExprVar()

Variable (or null)

asVar

Var asVar()

Convert to a Var variable.

isConstant

boolean isConstant()

Answer whether this is a constant expression - false includes "don't know" No constant folding so "false" from an expression that evaluates to a constant

getConstant

NodeValue getConstant()

NodeValue constant (returns null if not a constant)

isFunction

boolean isFunction()

Answer wether this is a function.

getFunction

ExprFunction getFunction()

Get the function (returns null if not a function)

visit

void visit(ExprVisitor visitor)