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


java.lang.Object
   net.sf.saxon.pattern.Pattern
      net.sf.saxon.pattern.LocationPathPattern

LocationPathPattern
final public class LocationPathPattern extends Pattern (Code)
A LocationPathPattern represents a path, for example of the form A/B/C... The components are represented as a linked list, each component pointing to its predecessor


Field Summary
public  PatternancestorPattern
    
protected  ExpressionequivalentExpr
    
protected  Expression[]filters
    
protected  booleanfirstElementPattern
    
protected  booleanlastElementPattern
    
public  NodeTestnodeTest
    
protected  intnumberOfFilters
    
public  PatternparentPattern
    
protected  booleanspecialFilter
    


Method Summary
public  voidaddFilter(Expression filter)
    
public  Patternanalyze(StaticContext env, ItemType contextItemType)
     Type-check the pattern, performing any type-dependent optimizations.
public  intgetDependencies()
     Get the dependencies of the pattern.
public  intgetFingerprint()
     Determine the fingerprint of nodes to which this pattern applies.
public  intgetNodeKind()
     Determine the types of nodes to which this pattern applies.
public  NodeTestgetNodeTest()
    
protected  booleaninternalMatches(NodeInfo node, XPathContext context)
    
public  IteratoriterateSubExpressions()
    
public  booleanmatches(NodeInfo node, XPathContext context)
     Determine whether the pattern matches a given node.
public  voidpromote(PromotionOffer offer)
     Offer promotion for subexpressions within this pattern.
public  voidresolveCurrent(LetExpression let, PromotionOffer offer)
     If the pattern contains any calls on current(), this method is called to modify such calls to become variable references to a variable declared in a specially-allocated local variable
Parameters:
  let - the expression that assigns the local variable.
public  Patternsimplify(StaticContext env)
    

Field Detail
ancestorPattern
public Pattern ancestorPattern(Code)



equivalentExpr
protected Expression equivalentExpr(Code)



filters
protected Expression[] filters(Code)



firstElementPattern
protected boolean firstElementPattern(Code)



lastElementPattern
protected boolean lastElementPattern(Code)



nodeTest
public NodeTest nodeTest(Code)



numberOfFilters
protected int numberOfFilters(Code)



parentPattern
public Pattern parentPattern(Code)



specialFilter
protected boolean specialFilter(Code)





Method Detail
addFilter
public void addFilter(Expression filter)(Code)
Add a filter to the pattern (while under construction)
Parameters:
  filter - The predicate (a boolean expression or numeric expression) to be added



analyze
public Pattern analyze(StaticContext env, ItemType contextItemType) throws XPathException(Code)
Type-check the pattern, performing any type-dependent optimizations. the optimised Pattern



getDependencies
public int getDependencies()(Code)
Get the dependencies of the pattern. The only possible dependency for a pattern is on local variables. This is analyzed in those patterns where local variables may appear.



getFingerprint
public int getFingerprint()(Code)
Determine the fingerprint of nodes to which this pattern applies. Used for optimisation. the fingerprint of nodes matched by this pattern.



getNodeKind
public int getNodeKind()(Code)
Determine the types of nodes to which this pattern applies. Used for optimisation. For patterns that match nodes of several types, return Node.NODE the type of node matched by this pattern. e.g. Node.ELEMENT or Node.TEXT



getNodeTest
public NodeTest getNodeTest()(Code)
Get a NodeTest that all the nodes matching this pattern must satisfy



internalMatches
protected boolean internalMatches(NodeInfo node, XPathContext context) throws XPathException(Code)
Test whether the pattern matches, but without changing the current() node



iterateSubExpressions
public Iterator iterateSubExpressions()(Code)
Iterate over the subexpressions within this pattern



matches
public boolean matches(NodeInfo node, XPathContext context) throws XPathException(Code)
Determine whether the pattern matches a given node.
Parameters:
  node - the node to be tested true if the pattern matches, else false



promote
public void promote(PromotionOffer offer) throws XPathException(Code)
Offer promotion for subexpressions within this pattern. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.

Unlike the corresponding method on net.sf.saxon.expr.Expression , this method does not return anything: it can make internal changes to the pattern, but cannot return a different pattern. Only certain kinds of promotion are applicable within a pattern: specifically, promotions affecting local variable references within the pattern.
Parameters:
  offer - details of the offer, for example the offer to moveexpressions that don't depend on the context to an outer level inthe containing expression
throws:
  net.sf.saxon.trans.XPathException - if any error is detected




resolveCurrent
public void resolveCurrent(LetExpression let, PromotionOffer offer) throws XPathException(Code)
If the pattern contains any calls on current(), this method is called to modify such calls to become variable references to a variable declared in a specially-allocated local variable
Parameters:
  let - the expression that assigns the local variable. This returns a dummy result, and is executedjust before evaluating the pattern, to get the value of the context item into the variable.
Parameters:
  offer - A PromotionOffer used to process the expressions and change the call on current() intoa variable reference
throws:
  XPathException -



simplify
public Pattern simplify(StaticContext env) throws XPathException(Code)
Simplify the pattern: perform any context-independent optimisations



Methods inherited from net.sf.saxon.pattern.Pattern
public Pattern analyze(StaticContext env, ItemType contextItemType) throws XPathException(Code)(Java Doc)
public int getColumnNumber()(Code)(Java Doc)
public double getDefaultPriority()(Code)(Java Doc)
public int getDependencies()(Code)(Java Doc)
public Executable getExecutable()(Code)(Java Doc)
public int getFingerprint()(Code)(Java Doc)
public int getLineNumber()(Code)(Java Doc)
public LocationProvider getLocationProvider()(Code)(Java Doc)
public int getNodeKind()(Code)(Java Doc)
abstract public NodeTest getNodeTest()(Code)(Java Doc)
public String getPublicId()(Code)(Java Doc)
public String getSystemId()(Code)(Java Doc)
protected boolean internalMatches(NodeInfo node, XPathContext context) throws XPathException(Code)(Java Doc)
public Iterator iterateSubExpressions()(Code)(Java Doc)
public static Pattern make(String pattern, StaticContext env, Executable exec) throws XPathException(Code)(Java Doc)
abstract public boolean matches(NodeInfo node, XPathContext context) throws XPathException(Code)(Java Doc)
public void promote(PromotionOffer offer) throws XPathException(Code)(Java Doc)
public void setExecutable(Executable executable)(Code)(Java Doc)
public void setLineNumber(int lineNumber)(Code)(Java Doc)
public void setOriginalText(String text)(Code)(Java Doc)
public void setSystemId(String systemId)(Code)(Java Doc)
public Pattern simplify(StaticContext env) throws XPathException(Code)(Java Doc)
public String toString()(Code)(Java Doc)

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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