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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.ComputedExpression
      net.sf.saxon.expr.Assignation
         net.sf.saxon.expr.ForExpression

ForExpression
public class ForExpression extends Assignation (Code)
A ForExpression maps an expression over a sequence. This version works with range variables, it doesn't change the context information



Constructor Summary
public  ForExpression()
    

Method Summary
public  voidcheckPermittedContents(SchemaType parentType, StaticContext env, boolean whole)
     Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type.
public  intcomputeCardinality()
    
public  ExpressionconvertWhereToPredicate(Optimizer opt, StaticContext env, ItemType contextItemType)
     Convert where clause, if possible, to a predicate.
public  voiddisplay(int level, NamePool pool, PrintStream out)
    
protected  Binding[]extendBindingList(Binding[] in)
    
protected  intgetConstructType()
    
public  intgetImplementationMethod()
     An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). This method indicates which of these methods is provided.
public  ItemTypegetItemType(TypeHierarchy th)
    
public  intgetPositionVariableNameCode()
    
public  intgetRequiredSlots()
     Get the number of slots required.
public  SequenceIteratoriterate(XPathContext context)
    
public  booleanmarkTailFunctionCalls()
     Mark tail function calls: only possible if the for expression iterates zero or one times.
public  Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
    
public  voidprocess(XPathContext context)
    
public  voidsetAction(Expression action)
    
public  voidsetPositionVariable(RangeVariableDeclaration decl)
    
public  voidsetSlotNumber(int nr)
    
public  ExpressiontypeCheck(StaticContext env, ItemType contextItemType)
    


Constructor Detail
ForExpression
public ForExpression()(Code)




Method Detail
checkPermittedContents
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException(Code)
Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. It's always OK to say yes, since the check will be repeated at run-time. The process of checking element and attribute constructors against the content model of a complex type also registers the type of content expected of those constructors, so the static validation can continue recursively.



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



convertWhereToPredicate
public Expression convertWhereToPredicate(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code)
Convert where clause, if possible, to a predicate. Returns the converted expression if modified, or null otherwise



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



extendBindingList
protected Binding[] extendBindingList(Binding[] in)(Code)
Extend an array of variable bindings to include the binding(s) defined in this expression



getConstructType
protected int getConstructType()(Code)
Get the type of this expression for use in tracing and diagnostics the type of expression, as enumerated in class net.sf.saxon.trace.Location



getImplementationMethod
public int getImplementationMethod()(Code)
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). This method indicates which of these methods is provided. This implementation provides both iterate() and process() methods natively.



getItemType
public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the items returned by the expression, if possible one of the values Type.STRING, Type.BOOLEAN, Type.NUMBER, Type.NODE,or Type.ITEM (meaning not known in advance)
Parameters:
  th -



getPositionVariableNameCode
public int getPositionVariableNameCode()(Code)



getRequiredSlots
public int getRequiredSlots()(Code)
Get the number of slots required. Normally 1, except for a FOR expression with an AT clause, where it is 2.



iterate
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)
Iterate over the sequence of values



markTailFunctionCalls
public boolean markTailFunctionCalls()(Code)
Mark tail function calls: only possible if the for expression iterates zero or one times. (This arises in XSLT/XPath, which does not have a LET expression, so FOR gets used instead)



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



process
public void process(XPathContext context) throws XPathException(Code)
Process this expression as an instruction, writing results to the current outputter



setAction
public void setAction(Expression action)(Code)



setPositionVariable
public void setPositionVariable(RangeVariableDeclaration decl)(Code)
Set the reference to the position variable (XQuery only)



setSlotNumber
public void setSlotNumber(int nr)(Code)
Set the slot number for the range variable



typeCheck
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException(Code)
Type-check the expression



Fields inherited from net.sf.saxon.expr.Assignation
protected Expression action(Code)(Java Doc)
protected transient RangeVariableDeclaration declaration(Code)(Java Doc)
protected int nameCode(Code)(Java Doc)
protected Expression sequence(Code)(Java Doc)
protected int slotNumber(Code)(Java Doc)
protected String variableName(Code)(Java Doc)

Methods inherited from net.sf.saxon.expr.Assignation
public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException(Code)(Java Doc)
protected Binding[] extendBindingList(Binding[] in)(Code)(Java Doc)
public Expression getAction()(Code)(Java Doc)
public int getLocalSlotNumber()(Code)(Java Doc)
public int getRequiredSlots()(Code)(Java Doc)
public RangeVariableDeclaration getVariableDeclaration()(Code)(Java Doc)
public int getVariableFingerprint()(Code)(Java Doc)
public String getVariableName(NamePool pool)(Code)(Java Doc)
public int getVariableNameCode()(Code)(Java Doc)
final public boolean isAssignable()(Code)(Java Doc)
final public boolean isGlobal()(Code)(Java Doc)
public Iterator iterateSubExpressions()(Code)(Java Doc)
public Expression promote(PromotionOffer offer) throws XPathException(Code)(Java Doc)
protected Expression promoteWhereClause(Binding positionBinding)(Code)(Java Doc)
public void setAction(Expression action)(Code)(Java Doc)
public void setSequence(Expression sequence)(Code)(Java Doc)
public void setSlotNumber(int nr)(Code)(Java Doc)
public void setVariableDeclaration(RangeVariableDeclaration decl)(Code)(Java Doc)
public Expression simplify(StaticContext env) throws XPathException(Code)(Java Doc)
public void suppressValidation(int validationMode)(Code)(Java Doc)

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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