- All Implemented Interfaces:
- Direct Known Subclasses:
public class SortedIterator extends java.lang.Object implements SequenceIterator, LastPositionFinder, LookaheadIteratorClass to do a sorted iteration
All Methods Instance Methods Concrete Methods Modifier and Type Method Description
buildArray()Create an array holding the items to be sorted and the values of their sort keys
getLength()Get the last position (that is, the number of items in the sequence).
hasNext()Determine whether there are more items to come.
next()Get the next item, in sorted order
setHostLanguage(HostLanguage language)Set the host language
supportsGetLength()Ask whether this iterator supports use of the
supportsHasNext()Ask whether the hasNext() method can be called.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
protected SequenceIterator base
protected SortKeyEvaluator sortKeyEvaluator
protected AtomicComparer comparators
protected ObjectToBeSorted values
protected int count
protected int position
protected XPathContext context
public SortedIterator(XPathContext context, SequenceIterator base, SortKeyEvaluator sortKeyEvaluator, AtomicComparer comparators, boolean createNewContext)Create a sorted iterator
context- the dynamic XPath evaluation context
base- an iterator over the sequence to be sorted
sortKeyEvaluator- an object that allows the n'th sort key for a given item to be evaluated
comparators- an array of AtomicComparers, one for each sort key, for comparing sort key values
createNewContext- true if sort keys are computed relative to the item being sorted (as in XSLT but not XQuery)
public void setHostLanguage(HostLanguage language)Set the host language
language- the host language (for example
public boolean supportsHasNext()Description copied from interface:
LookaheadIteratorAsk whether the hasNext() method can be called. This method must be called before calling hasNext(), because some iterators implement this interface, but only support look-ahead under particular circumstances (this is usually because they delegate to another iterator)
public boolean hasNext()Determine whether there are more items to come. Note that this operation is stateless and it is not necessary (or usual) to call it before calling next(). It is used only when there is an explicit need to tell if we are at the last element.
This method must not be called unless the method
public Item next()Get the next item, in sorted order
- Specified by:
- the next item, or null if there are no more items. Once a call on next() has returned null, no further calls should be made. The preferred action for an iterator if subsequent calls on next() are made is to return null again, and all implementations within Saxon follow this rule.
public boolean supportsGetLength()Ask whether this iterator supports use of the
getLength()method. This method should always be called before calling
getLength(), because an iterator that implements this interface may support use of
getLength()in some situations and not in others
public int getLength()Description copied from interface:
LastPositionFinderGet the last position (that is, the number of items in the sequence). This method is non-destructive: it does not change the state of the iterator. The result is undefined if the next() method of the iterator has already returned null. This method must not be called unless the
LastPositionFinder.supportsGetLength()has been called and has returned true.