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


java.lang.Object
   net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.expr.PathExpression

PathExpression
final public class PathExpression extends ComputedExpression implements MappingFunction(Code)
An expression that establishes a set of nodes by following relationships between nodes in the document. Specifically, it consists of a start expression which defines a set of nodes, and a Step which defines a relationship to be followed from those nodes to create a new set of nodes.



Constructor Summary
public  PathExpression(Expression start, Expression step)
    

Method Summary
public  intcomputeCardinality()
    
public  intcomputeDependencies()
     Determine which aspects of the context the expression depends on.
public  intcomputeSpecialProperties()
     Get the static properties of this expression (other than its type).
public  voiddisplay(int level, NamePool pool, PrintStream out)
    
public  booleanequals(Object other)
    
public  ExpressiongetFirstStep()
     Get the first step in this expression.
final public  ItemTypegetItemType(TypeHierarchy th)
    
public  ExpressiongetLastStep()
    
public  ExpressiongetLeadingSteps()
    
public  ExpressiongetRemainingSteps()
     Get all steps after the first.
public  ExpressiongetStartExpression()
    
public  ExpressiongetStepExpression()
    
public  inthashCode()
    
public  booleanisAbsolute(TypeHierarchy th)
    
public  SequenceIteratoriterate(XPathContext context)
    
public  IteratoriterateSubExpressions()
    
public  Objectmap(Item item, XPathContext context)
     Mapping function, from a node returned by the start iteration, to a sequence returned by the child.
public  Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
    
public  Expressionpromote(PromotionOffer offer)
    
public  Expressionsimplify(StaticContext env)
    
public  ExpressiontypeCheck(StaticContext env, ItemType contextItemType)
    


Constructor Detail
PathExpression
public PathExpression(Expression start, Expression step)(Code)
Constructor
Parameters:
  start - A node-set expression denoting the absolute or relative set of nodes from which thenavigation path should start.
Parameters:
  step - The step to be followed from each node in the start expression to yield a newnode-set




Method Detail
computeCardinality
public int computeCardinality()(Code)
Determine the static cardinality of the expression



computeDependencies
public int computeDependencies()(Code)
Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as XPathContext.VARIABLES and XPathContext.CURRENT_NODE



computeSpecialProperties
public int computeSpecialProperties()(Code)
Get the static properties of this expression (other than its type). The result is bit-signficant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.



display
public void display(int level, NamePool pool, PrintStream out)(Code)
Diagnostic print of expression structure



equals
public boolean equals(Object other)(Code)
Is this expression the same as another expression?



getFirstStep
public Expression getFirstStep()(Code)
Get the first step in this expression. A path expression A/B/C is represented as (A/B)/C, but the first step is A



getItemType
final public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the items returned by this exprssion the type of the step
Parameters:
  th -



getLastStep
public Expression getLastStep()(Code)
Get the last step of the path expression



getLeadingSteps
public Expression getLeadingSteps()(Code)
Get a path expression consisting of all steps except the last



getRemainingSteps
public Expression getRemainingSteps()(Code)
Get all steps after the first. This is complicated by the fact that A/B/C is represented as ((A/B)/C; we are required to return B/C



getStartExpression
public Expression getStartExpression()(Code)
Get the start expression (the left-hand operand)



getStepExpression
public Expression getStepExpression()(Code)
Get the step expression (the right-hand operand)



hashCode
public int hashCode()(Code)
get HashCode for comparing two expressions



isAbsolute
public boolean isAbsolute(TypeHierarchy th)(Code)
Test whether a path expression is an absolute path - that is, a path whose first step selects a document node



iterate
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)
Iterate the path-expression in a given context
Parameters:
  context - the evaluation context



iterateSubExpressions
public Iterator iterateSubExpressions()(Code)
Get the immediate subexpressions of this expression



map
public Object map(Item item, XPathContext context) throws XPathException(Code)
Mapping function, from a node returned by the start iteration, to a sequence returned by the child.



optimize
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code)
Optimize the expression and perform type analysis



promote
public Expression promote(PromotionOffer offer) throws XPathException(Code)
Promote this expression if possible



simplify
public Expression simplify(StaticContext env) throws XPathException(Code)
Simplify an expression the simplified expression



typeCheck
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException(Code)
Optimize the expression and perform type analysis



Fields inherited from net.sf.saxon.expr.ComputedExpression
protected int locationId(Code)(Java Doc)
protected int staticProperties(Code)(Java Doc)

Methods inherited from net.sf.saxon.expr.ComputedExpression
public void adoptChildExpression(Expression child)(Code)(Java Doc)
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException(Code)(Java Doc)
abstract protected int computeCardinality()(Code)(Java Doc)
public int computeDependencies()(Code)(Java Doc)
public int computeSpecialProperties()(Code)(Java Doc)
final public void computeStaticProperties()(Code)(Java Doc)
final public Expression doPromotion(Expression subexpression, PromotionOffer offer) throws XPathException(Code)(Java Doc)
protected void dynamicError(String message, XPathContext context) throws DynamicError(Code)(Java Doc)
protected void dynamicError(String message, String code, XPathContext context) throws DynamicError(Code)(Java Doc)
public boolean effectiveBooleanValue(XPathContext context) throws XPathException(Code)(Java Doc)
public String evaluateAsString(XPathContext context) throws XPathException(Code)(Java Doc)
public Item evaluateItem(XPathContext context) throws XPathException(Code)(Java Doc)
public int getCardinality()(Code)(Java Doc)
public int getColumnNumber()(Code)(Java Doc)
protected int getConstructType()(Code)(Java Doc)
public int getDependencies()(Code)(Java Doc)
public Executable getExecutable()(Code)(Java Doc)
public int getImplementationMethod()(Code)(Java Doc)
public InstructionInfo getInstructionInfo()(Code)(Java Doc)
public int getIntrinsicDependencies()(Code)(Java Doc)
public int getLineNumber()(Code)(Java Doc)
final public int getLocationId()(Code)(Java Doc)
public LocationProvider getLocationProvider()(Code)(Java Doc)
public Container getParentExpression()(Code)(Java Doc)
final public String getPublicId()(Code)(Java Doc)
public int[] getSlotsUsed()(Code)(Java Doc)
final public int getSpecialProperties()(Code)(Java Doc)
public String getSystemId()(Code)(Java Doc)
public boolean hasBadParentPointer()(Code)(Java Doc)
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)(Java Doc)
public Iterator iterateSubExpressions()(Code)(Java Doc)
public boolean markTailFunctionCalls()(Code)(Java Doc)
public void process(XPathContext context) throws XPathException(Code)(Java Doc)
public Expression promote(PromotionOffer offer) throws XPathException(Code)(Java Doc)
final public void resetStaticProperties()(Code)(Java Doc)
public void setLocationId(int id)(Code)(Java Doc)
public void setParentExpression(Container parent)(Code)(Java Doc)
public Expression simplify(StaticContext env) throws XPathException(Code)(Java Doc)
public void suppressValidation(int validationMode)(Code)(Java Doc)
protected void typeError(String message, XPathContext context) throws DynamicError(Code)(Java Doc)
protected void typeError(String message, String errorCode, XPathContext context) throws DynamicError(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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