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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.expr 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.expr.MappingIterator

MappingIterator
final public class MappingIterator implements SequenceIterator,AtomizableIterator(Code)
MappingIterator merges a sequence of sequences into a single flat sequence. It takes as inputs an iteration, and a mapping function to be applied to each Item returned by that iteration. The mapping function itself returns another iteration. The result is an iteration of the concatenation of all the iterations returned by the mapping function.

This is a powerful class. It is used, with different mapping functions, in a great variety of ways. It underpins the way that "for" expressions and path expressions are evaluated, as well as sequence expressions. It is also used in the implementation of the document(), key(), and id() functions.




Constructor Summary
public  MappingIterator(SequenceIterator base, MappingFunction action, XPathContext context)
     Construct a MappingIterator that will apply a specified MappingFunction to each Item returned by the base iterator.
Parameters:
  base - the base iterator
Parameters:
  action - the mapping function to be applied
Parameters:
  context - the processing context.

Method Summary
public  Itemcurrent()
    
public  SequenceIteratorgetAnother()
    
public  intgetProperties()
     Get properties of this iterator, as a bit-significant integer. the properties of this iterator.
public  Itemnext()
    
public  intposition()
    
public  voidsetIsAtomizing(boolean atomizing)
     Indicate that any nodes returned in the sequence will be atomized.


Constructor Detail
MappingIterator
public MappingIterator(SequenceIterator base, MappingFunction action, XPathContext context)(Code)
Construct a MappingIterator that will apply a specified MappingFunction to each Item returned by the base iterator.
Parameters:
  base - the base iterator
Parameters:
  action - the mapping function to be applied
Parameters:
  context - the processing context. This should be supplied only if each item to be processedis to become the context item. In this case "base" should be the same as context.getCurrentIterator().




Method Detail
current
public Item current()(Code)



getAnother
public SequenceIterator getAnother() throws XPathException(Code)



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.



next
public Item next() throws XPathException(Code)



position
public int position()(Code)



setIsAtomizing
public void setIsAtomizing(boolean atomizing)(Code)
Indicate that any nodes returned in the sequence will be atomized. This means that if it wishes to do so, the implementation can return the typed values of the nodes rather than the nodes themselves. The implementation is free to ignore this hint.
Parameters:
  atomizing - true if the caller of this iterator will atomize anynodes that are returned, and is therefore willing to accept the typedvalue of the nodes instead of the nodes themselves.



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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