net.sf.saxon.functions

Class Tokenize

public class Tokenize extends SystemFunction

This class implements the tokenize() function for regular expression matching. This returns a sequence of strings representing the unmatched substrings: the separators which match the regular expression are not returned.
Method Summary
RegularExpressiongetCompiledRegularExpression()
Get the compiled regular expression if available, otherwise return null
SequenceIteratoriterate(XPathContext c)
Iterate over the results of the function
static voidmain(String[] args)
Simple command-line interface for testing.
Expressionoptimize(ExpressionVisitor visitor, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
Expressionsimplify(ExpressionVisitor visitor)
Simplify and validate.

Method Detail

getCompiledRegularExpression

public RegularExpression getCompiledRegularExpression()
Get the compiled regular expression if available, otherwise return null

Returns: the compiled regular expression, or null

iterate

public SequenceIterator iterate(XPathContext c)
Iterate over the results of the function

main

public static void main(String[] args)
Simple command-line interface for testing.

Parameters: args (1) the string to be tokenized (2) the regular expression

Throws: Exception

optimize

public Expression optimize(ExpressionVisitor visitor, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

Parameters: visitor an expression visitor contextItemType the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to ITEM_TYPE

Returns: the original expression, rewritten if appropriate to optimize execution

Throws: net.sf.saxon.trans.XPathException if an error is discovered during this phase (typically a type error)

simplify

public Expression simplify(ExpressionVisitor visitor)
Simplify and validate. This is a pure function so it can be simplified in advance if the arguments are known

Parameters: visitor an expression visitor