org.da.sparqlhelper.sparql.model.expressions

Interface Expression

All Superinterfaces:

ExpressionOperators

All Known Implementing Classes:

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

public interface Expression
extends ExpressionOperators

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

Field Summary

Fields inherited from interface org.da.sparqlhelper.sparql.model.expressions.ExpressionOperators

AND, DEFAULT, DIVIDE, MINUS, MULTIPLY, NOT, OR, PLUS

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.
static Expression	create(java.lang.String content, ISparqlRequestGroup request) Create an expression by parsing a String.
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.

Method Detail

create

static Expression create(java.lang.String content,
                         ISparqlRequestGroup request)

Create an expression by parsing a String.

Parameters:

content - the string to parse

request - the parent request

Returns:

the expression

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 false by default. Simple expressions are of one of the following types:

• LiteralExpression
• VariableExpression
• QualifiedNameExpression
• FunctionExpression

The following are not considered as simple expressions:

• ArithmeticExpression
• ComparisonExpression

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