com.icl.saxon.expr

Class NodeSetComparison

public class NodeSetComparison extends Expression

NodeSetComparison: A Relational Expression that compares a node-set with a string or numeric value for equals, not-equals, greater-than or less-than.

Field Summary
NodeSetExpression	nodeset
int	operator
Value	value

Constructor Summary
	NodeSetComparison(NodeSetExpression p1, int op, Value p2)

Method Summary
void	display(int level) Diagnostic print of expression structure
Value	evaluate(Context c) Evaluate the expression in a given context
boolean	evaluateAsBoolean(Context c) Evaluate the expression in a given context
int	getDataType() Determine the data type of the expression, if possible
int	getDependencies() Determine which aspects of the context the expression depends on.
Expression	reduce(int dependencies, Context context) Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.
Expression	simplify() Simplify an expression

Field Detail

nodeset

NodeSetExpression nodeset

operator

int operator

value

Value value

Constructor Detail

NodeSetComparison

public NodeSetComparison(NodeSetExpression p1, int op, Value p2)

Method Detail

display

public void display(int level)

Diagnostic print of expression structure

evaluate

public Value evaluate(Context c)

Evaluate the expression in a given context

Parameters: c the given context for evaluation

Returns: a BooleanValue representing the result of the comparison of the two operands

evaluateAsBoolean

public boolean evaluateAsBoolean(Context c)

Evaluate the expression in a given context

Parameters: c the given context for evaluation

Returns: a boolean representing the result of the numeric comparison of the two operands

getDataType

public int getDataType()

Determine the data type of the expression, if possible

Returns: Value.BOOLEAN

getDependencies

public int getDependencies()

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

reduce

public Expression reduce(int dependencies, Context context)

Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Parameters: dependencies The dependencies to be removed context The context to be used for the partial evaluation

Returns: a new expression that does not have any of the specified dependencies

simplify

public Expression simplify()

Simplify an expression

Returns: the simplified expression