Package net.sf.saxon.functions
Interface Fold
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- All Known Implementing Classes:
FoldLeftFn.FoldLeftFold
public interface Fold
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description booleanisFinished()Ask whether the computation has completed.voidprocessItem(Item item)Process one item in the input sequence, returning a new copy of the working dataSequenceresult()Compute the final result of the function, when all the input has been processed
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Method Detail
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processItem
void processItem(Item item) throws XPathException
Process one item in the input sequence, returning a new copy of the working data- Parameters:
item- the item to be processed from the input sequence- Throws:
XPathException- if a dynamic error occurs
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isFinished
boolean isFinished()
Ask whether the computation has completed. A function that can deliver its final result without reading the whole input should return true; this will be followed by a call on result() to deliver the final result.- Returns:
- true if the result of the function is now available even though not all items in the sequence have been processed
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result
Sequence result() throws XPathException
Compute the final result of the function, when all the input has been processed- Returns:
- the result of the function
- Throws:
XPathException- if a dynamic error occurs
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