net.sf.saxon.functions
public class Remove extends SystemFunction
Nested Class Summary | |
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static class | Remove.RemoveIterator
An implementation of SequenceIterator that returns all items except the one
at a specified position. |
Method Summary | |
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ItemType | getItemType(TypeHierarchy th)
Determine the data type of the items in the sequence |
SequenceIterator | iterate(XPathContext context)
Evaluate the function to return an iteration of selected nodes. |
Expression | optimize(ExpressionVisitor visitor, ItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression | simplify(ExpressionVisitor visitor)
Simplify. |
Parameters: th the type hierarchy cache
Returns: the type of the input sequence
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)
Parameters: visitor an expression visitor