com.icl.saxon.expr
Class RelationalExpression
(package private) final class RelationalExpression
Relational Expression: a boolean expression that compares two expressions
for equals, not-equals, greater-than or less-than.
containsReferences , display , enumerate , evaluate , evaluateAsBoolean , evaluateAsNodeSet , evaluateAsNumber , evaluateAsString , getDataType , getDependencies , getStaticContext , indent , isContextDocumentNodeSet , make , outputStringValue , reduce , setStaticContext , simplify , usesCurrent |
RelationalExpression
public RelationalExpression()
Default constructor
RelationalExpression
public RelationalExpression(Expression p1,
int op,
Expression p2)
Create a relational expression identifying the two operands and the operator
p1
- the left-hand operandop
- the operator, as a token returned by the Tokenizer (e.g. Tokenizer.LT)p2
- the right-hand operand
evaluate
public Value evaluate(Context c)
throws XPathException
Evaluate the expression in a given context
- evaluate in interface Expression
c
- the given context for evaluation
- a BooleanValue representing the result of the numeric comparison of the two operands
evaluateAsBoolean
public boolean evaluateAsBoolean(Context c)
throws XPathException
Evaluate the expression in a given context
- evaluateAsBoolean in interface Expression
c
- the given context for evaluation
- a boolean representing the result of the numeric comparison of the two operands
getDataType
public int getDataType()
Determine the data type of the expression
- getDataType in interface Expression
reduce
public Expression reduce(int dependencies,
Context context)
throws XPathException
Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
- reduce in interface Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
- a new expression that does not have any of the specified
dependencies