Java Doc for SimpleContentConstructor.java in  » XML » XPath-Saxon » net » sf » saxon » instruct » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


java.lang.Object
   net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.instruct.SimpleContentConstructor

All known Subclasses:   net.sf.saxon.instruct.QuerySimpleContentConstructor,
SimpleContentConstructor
public class SimpleContentConstructor extends ComputedExpression (Code)
This class implements the rules for an XSLT simple content constructor, which are used in constructing the string value of an attribute node, text node, comment node, etc, from the value of the select expression or the contained sequence constructor.


Field Summary
 booleanisAtomic
    
 booleanisSingleton
    
 Expressionselect
    
 Expressionseparator
    

Constructor Summary
public  SimpleContentConstructor(Expression select, Expression separator)
    

Method Summary
protected  intcomputeCardinality()
     Compute the cardinality of the result of the expression.
public  voiddisplay(int level, NamePool pool, PrintStream out)
     Diagnostic print of expression structure.
public  ItemevaluateItem(XPathContext context)
     Evaluate an expression as a single item.
public  intgetImplementationMethod()
     An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
public  ItemTypegetItemType(TypeHierarchy th)
     Determine the data type of the expression, if possible.
public  IteratoriterateSubExpressions()
     Get the immediate sub-expressions of this expression.
public  Expressionoptimize(Optimizer opt, StaticContext env, ItemType contextItemType)
    
public  Expressionpromote(PromotionOffer offer)
     Offer promotion for this subexpression.
public  Expressionsimplify(StaticContext env)
     Simplify an expression.
public  ExpressiontypeCheck(StaticContext env, ItemType contextItemType)
    

Field Detail
isAtomic
boolean isAtomic(Code)



isSingleton
boolean isSingleton(Code)



select
Expression select(Code)



separator
Expression separator(Code)




Constructor Detail
SimpleContentConstructor
public SimpleContentConstructor(Expression select, Expression separator)(Code)




Method Detail
computeCardinality
protected int computeCardinality()(Code)
Compute the cardinality of the result of the expression. the cardinality, @link {StaticProperty.EXACTLY_ONE}



display
public void display(int level, NamePool pool, PrintStream out)(Code)
Diagnostic print of expression structure. The expression is written to the System.err output stream
Parameters:
  level - indentation level for this expression
Parameters:
  pool - NamePool used to expand any names appearing in the expression
Parameters:
  out - Output destination



evaluateItem
public Item evaluateItem(XPathContext context) throws XPathException(Code)
Evaluate an expression as a single item. This always returns either a single Item or null (denoting the empty sequence). No conversion is done. This method should not be used unless the static type of the expression is a subtype of "item" or "item?": that is, it should not be called if the expression may return a sequence. There is no guarantee that this condition will be detected.
Parameters:
  context - The context in which the expression is to be evaluated the node or atomic value that results from evaluating theexpression; or null to indicate that the result is an emptysequence
throws:
  net.sf.saxon.trans.XPathException - if any dynamic error occurs evaluating theexpression



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 prefered.



getItemType
public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the expression, if possible. All expression return sequences, in general; this method determines the type of the items within the sequence, assuming that (a) this is known in advance, and (b) it is the same for all items in the sequence.

This method should always return a result, though it may be the best approximation that is available at the time.

a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER,Type.NODE, or Type.ITEM (meaning not known at compile time)
Parameters:
  th -



iterateSubExpressions
public Iterator iterateSubExpressions()(Code)
Get the immediate sub-expressions of this expression. Default implementation returns a zero-length array, appropriate for an expression that has no sub-expressions. an iterator containing the sub-expressions of this expression



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



promote
public Expression promote(PromotionOffer offer) throws XPathException(Code)
Offer promotion for this subexpression. 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.
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 if the offer is not accepted, return this expression unchanged.Otherwise return the result of rewriting the expression to promotethis subexpression
throws:
  net.sf.saxon.trans.XPathException - if any error is detected



simplify
public Expression simplify(StaticContext env) throws XPathException(Code)
Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing. the simplified expression
throws:
  net.sf.saxon.trans.XPathException - if an error is discovered during expressionrewriting



typeCheck
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException(Code)



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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