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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.UnaryExpression

All known Subclasses:   net.sf.saxon.expr.Atomizer,  net.sf.saxon.expr.UntypedAtomicConverter,  net.sf.saxon.expr.LazyExpression,  net.sf.saxon.sort.Reverser,  net.sf.saxon.expr.FirstItemExpression,  net.sf.saxon.expr.NumericPromoter,  net.sf.saxon.expr.CardinalityChecker,  net.sf.saxon.expr.AtomicSequenceConverter,  net.sf.saxon.expr.CastExpression,  net.sf.saxon.sort.DocumentSorter,  net.sf.saxon.expr.InstanceOfExpression,  net.sf.saxon.expr.CastableExpression,  net.sf.saxon.expr.ItemChecker,  net.sf.saxon.expr.SingletonAtomizer,
UnaryExpression
abstract public class UnaryExpression extends ComputedExpression (Code)
Unary Expression: an expression taking a single operand expression


Field Summary
protected  Expressionoperand
    

Constructor Summary
public  UnaryExpression(Expression p0)
    

Method Summary
public  intcomputeCardinality()
     Determine the static cardinality.
public  intcomputeSpecialProperties()
     Get the static properties of this expression (other than its type).
public  voiddisplay(int level, NamePool pool, PrintStream out)
    
abstract protected  StringdisplayOperator(NamePool pool)
    
public  booleanequals(Object other)
    
public  ExpressiongetBaseExpression()
    
public  ItemTypegetItemType(TypeHierarchy th)
     Determine the data type of the expression, if possible.
public  inthashCode()
     get HashCode for comparing two expressions.
public  IteratoriterateSubExpressions()
    
public  Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
     Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.


Parameters:
  opt - the optimizer in use.
public  Expressionpromote(PromotionOffer offer)
    
public  Expressionsimplify(StaticContext env)
    
public  ExpressiontypeCheck(StaticContext env, ItemType contextItemType)
     Type-check the expression.

Field Detail
operand
protected Expression operand(Code)




Constructor Detail
UnaryExpression
public UnaryExpression(Expression p0)(Code)




Method Detail
computeCardinality
public int computeCardinality()(Code)
Determine the static cardinality. Default implementation returns the cardinality of the operand



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



displayOperator
abstract protected String displayOperator(NamePool pool)(Code)
Give a string representation of the operator for use in diagnostics the operator, as a string



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



getBaseExpression
public Expression getBaseExpression()(Code)



getItemType
public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the expression, if possible. The default implementation for unary expressions returns the item type of the operand the item type of the items in the result sequence, insofar as thisis known statically.
Parameters:
  th -



hashCode
public int hashCode()(Code)
get HashCode for comparing two expressions. Note that this hashcode gives the same result for (A op B) and for (B op A), whether or not the operator is commutative.



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



optimize
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code)
Perform optimisation of an expression and its subexpressions.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.


Parameters:
  opt - the optimizer in use. This provides access to supporting functions; it also allowsdifferent optimization strategies to be used in different circumstances.
Parameters:
  env - the static context of the expression
Parameters:
  contextItemType - the static type of "." at the point where this expression is invoked.The parameter is set to null if it is known statically that the context item will be undefined.If the type of the context item is not known statically, the argument is set tonet.sf.saxon.type.Type.ITEM_TYPE the original expression, rewritten if appropriate to optimize execution
throws:
  net.sf.saxon.trans.StaticError - if an error is discovered during this phase(typically a type error)



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)
Type-check the expression. Default implementation for unary operators that accept any kind of operand



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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