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


java.lang.Object
   net.sf.saxon.sxpath.XPathExpression

XPathExpression
public class XPathExpression (Code)
This class is a representation of an XPath Expression for use with the XPathEvaluator class. It is modelled on the XPath API defined in JAXP 1.3, but is cut down to remove any dependencies on JAXP 1.3, making it suitable for use on vanilla JDK 1.4 installations.
author:
   Michael H. Kay



Constructor Summary
protected  XPathExpression(XPathEvaluator evaluator, Expression exp)
    

Method Summary
public  Listevaluate(Source source)
     Execute a prepared XPath expression, returning the results as a List.
Parameters:
  source - the document or other node against which the XPath expressionwill be evaluated.
public  ObjectevaluateSingle(Source source)
     Execute a prepared XPath expression, returning the first item in the result. This is useful where it is known that the expression will only return a singleton value (for example, a single node, or a boolean).
Parameters:
  source - the document or other node against which the XPath expressionwill be evaluated.
public  ExpressiongetInternalExpression()
     Low-level method to get the internal Saxon expression object.
public  SequenceIteratorrawIterator(Source source)
     Get a raw iterator over the results of the expression.
protected  voidsetStackFrameMap(SlotManager map)
    


Constructor Detail
XPathExpression
protected XPathExpression(XPathEvaluator evaluator, Expression exp)(Code)
The constructor is protected, to ensure that instances can only be created using the createExpression() method of XPathEvaluator




Method Detail
evaluate
public List evaluate(Source source) throws XPathException(Code)
Execute a prepared XPath expression, returning the results as a List.
Parameters:
  source - the document or other node against which the XPath expressionwill be evaluated. This may be a Saxon NodeInfo object, representing a node in anexisting tree, or it may be any kind of JAXP Source object such as a StreamSourceSAXSource or DOMSource. The results of the expression, as a List. The List represents the sequenceof items returned by the expression. Each item in the list will either be an instanceof net.sf.saxon.om.NodeInfo, representing a node, or a Java object representing an atomic value.



evaluateSingle
public Object evaluateSingle(Source source) throws XPathException(Code)
Execute a prepared XPath expression, returning the first item in the result. This is useful where it is known that the expression will only return a singleton value (for example, a single node, or a boolean).
Parameters:
  source - the document or other node against which the XPath expressionwill be evaluated. This may be a Saxon NodeInfo object, representing a node in anexisting tree, or it may be any kind of JAXP Source object such as a StreamSourceSAXSource or DOMSource. The first item in the sequence returned by the expression. If the expressionreturns an empty sequence, this method returns null. Otherwise, it returns the firstitem in the result sequence, represented as a Java object using the same mapping as forthe evaluate() method



getInternalExpression
public Expression getInternalExpression()(Code)
Low-level method to get the internal Saxon expression object. This exposes a wide range of internal methods that may be needed by specialized applications, and allows greater control over the dynamic context for evaluating the expression. the underlying Saxon expression object.



rawIterator
public SequenceIterator rawIterator(Source source) throws XPathException(Code)
Get a raw iterator over the results of the expression. This returns results without any conversion of the returned items to "native" Java classes. This method is intended for use by applications that need to process the results of the expression using internal Saxon interfaces.
Parameters:
  source - the document or other node against which the XPath expressionwill be evaluated. This may be a Saxon NodeInfo object, representing a node in anexisting tree, or it may be any kind of JAXP Source object such as a StreamSourceSAXSource or DOMSource.



setStackFrameMap
protected void setStackFrameMap(SlotManager map)(Code)
Define the number of slots needed for local variables within the expression



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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