org.da.sparqlhelper.sparql.model.expressions

Interface Expression

All Known Implementing Classes:

AbstractExpression, ArithmeticExpression, ComparisonExpression, FunctionExpression, LiteralExpression, QualifiedNameExpression, VariableExpression

public interface Expression

Represent an expression appearing in a BIND, FILTER, or COALESCE construct.

Field Summary

Fields

Modifier and Type	Field and Description
static short	AND The "&&" operator.
static short	DEFAULT
static short	DIVIDE The "/" operator.
static short	MINUS The "-" operator.
static short	MULTIPLY The "*" operator.
static short	NOT The "!"
static short	OR The "||" operator.
static short	PLUS The "+" operator.

Method Summary

Modifier and Type	Method and Description
void	appendContent(java.lang.String prefix, java.lang.StringBuilder buf) Append the expression content to a buffer.
boolean	checkValidity(ISparqlRequestGroup request) Return true if the expression is valid.
default java.lang.String	getContent(java.lang.String prefix) Return the expression content.
short	getOperator() Return the operator to use for the expression.
default java.lang.String	getOperatorAsString() Return the operator as a String.
default java.lang.String	getOperatorAsString(short theOperator) Return an operator as a String.
java.util.Set<java.lang.String>	getOutputVariables() Return the variables which are in output of the expression.
java.util.Set<java.lang.String>	getVariables() Return the variables used in the expression.
default boolean	isSimpleExpression() Return true if the expression is a simple expression.
void	setOperator(short operator) Set the operator to use for the expression.

Field Detail

DEFAULT

static final short DEFAULT

See Also:

Constant Field Values

PLUS

static final short PLUS

The "+" operator.

See Also:

Constant Field Values

MINUS

static final short MINUS

The "-" operator.

See Also:

Constant Field Values

MULTIPLY

static final short MULTIPLY

The "*" operator.

See Also:

Constant Field Values

DIVIDE

static final short DIVIDE

The "/" operator.

See Also:

Constant Field Values

OR

static final short OR

The "||" operator.

See Also:

Constant Field Values

AND

static final short AND

The "&&" operator.

See Also:

Constant Field Values

NOT

static final short NOT

The "!" operator.

See Also:

Constant Field Values

Method Detail

setOperator

void setOperator(short operator)

Set the operator to use for the expression. It will be used to combine this expression with the previous one. Note that if the expression is the first one in the expreszsions list, the operator has no effect.

Parameters:

operator - the operator

getOperator

short getOperator()

Return the operator to use for the expression.

Returns:

the operator

appendContent

void appendContent(java.lang.String prefix,
                   java.lang.StringBuilder buf)

Append the expression content to a buffer.

Parameters:

prefix - the prefix

buf - the buffer

getContent

default java.lang.String getContent(java.lang.String prefix)

Return the expression content.

Parameters:

prefix - the prefix

Returns:

the expression content

getOutputVariables

java.util.Set<java.lang.String> getOutputVariables()

Return the variables which are in output of the expression.

Returns:

the variables

getVariables

java.util.Set<java.lang.String> getVariables()

Return the variables used in the expression.

Returns:

the variables

isSimpleExpression

default boolean isSimpleExpression()

Return true if the expression is a simple expression. Return true by default.

Returns:

true if the expression is a simple expression

getOperatorAsString

default java.lang.String getOperatorAsString()

Return the operator as a String.

Returns:

the operator as a String

See Also:

setOperator(short)

checkValidity

boolean checkValidity(ISparqlRequestGroup request)

Return true if the expression is valid.

Parameters:

request - the request

Returns:

true if the expression is valid

getOperatorAsString

default java.lang.String getOperatorAsString(short theOperator)

Return an operator as a String.

Parameters:

theOperator - the operator

Returns:

the operator as a String