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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.sort 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.sort.GroupByIterator

GroupByIterator
public class GroupByIterator implements GroupIterator,LastPositionFinder,LookaheadIterator(Code)
A GroupByIterator iterates over a sequence of groups defined by xsl:for-each-group group-by="x". The groups are returned in order of first appearance. Note that an item can appear in several groups; indeed, an item may be the leading item of more than one group, which means that knowing the leading item is not enough to know the current group.

The GroupByIterator acts as a SequenceIterator, where successive calls of next() return the leading item of each group in turn. The current item of the iterator is therefore the leading item of the current group. To get access to all the members of the current group, the method iterateCurrentGroup() is used; this underpins the current-group() function in XSLT. The grouping key for the current group is available via the getCurrentGroupingKey() method.




Constructor Summary
public  GroupByIterator(SequenceIterator population, Expression keyExpression, XPathContext keyContext, Comparator collator)
    

Method Summary
public  Itemcurrent()
    
public  SequenceIteratorgetAnother()
    
public  ListgetCurrentGroup()
    
public  AtomicValuegetCurrentGroupingKey()
    
public  intgetLastPosition()
    
public  intgetProperties()
     Get properties of this iterator, as a bit-significant integer. the properties of this iterator.
public  booleanhasNext()
    
public  SequenceIteratoriterateCurrentGroup()
    
public  Itemnext()
    
public  intposition()
    


Constructor Detail
GroupByIterator
public GroupByIterator(SequenceIterator population, Expression keyExpression, XPathContext keyContext, Comparator collator) throws XPathException(Code)
Create a GroupByIterator
Parameters:
  population - iterator over the population to be grouped
Parameters:
  keyExpression - the expression used to calculate the grouping key
Parameters:
  keyContext - dynamic context for calculating the grouping key
Parameters:
  collator - Collation to be used for comparing grouping keys
throws:
  XPathException -




Method Detail
current
public Item current()(Code)



getAnother
public SequenceIterator getAnother() throws XPathException(Code)



getCurrentGroup
public List getCurrentGroup()(Code)
Get the contents of the current group as a java List the contents of the current group



getCurrentGroupingKey
public AtomicValue getCurrentGroupingKey()(Code)
Get the value of the grouping key for the current group the grouping key



getLastPosition
public int getLastPosition() throws XPathException(Code)
Get the last position (that is, the number of groups)



getProperties
public int getProperties()(Code)
Get properties of this iterator, as a bit-significant integer. the properties of this iterator. This will be some combination ofproperties such as GROUNDED, LAST_POSITION_FINDER,and LOOKAHEAD. It is alwaysacceptable to return the value zero, indicating that there are no known special properties.It is acceptable for the properties of the iterator to change depending on its state.



hasNext
public boolean hasNext()(Code)



iterateCurrentGroup
public SequenceIterator iterateCurrentGroup()(Code)
Get an iterator over the items in the current group the iterator



next
public Item next() throws XPathException(Code)



position
public int position()(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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