net.sf.saxon.instruct
Class FixedAttribute

java.lang.Object
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  +--net.sf.saxon.instruct.Instruction
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        +--net.sf.saxon.instruct.ExprInstruction
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              +--net.sf.saxon.instruct.SimpleNodeConstructor
                    |
                    +--net.sf.saxon.instruct.FixedAttribute
All Implemented Interfaces:
Expression, java.io.Serializable, javax.xml.transform.SourceLocator

public final class FixedAttribute
extends SimpleNodeConstructor

An instruction derived from an xsl:attribute element in stylesheet, or from an attribute constructor in XQuery. This version deals only with attributes whose name is known at compile time. It is also used for attributes of literal result elements.

See Also:
Serialized Form

Field Summary
 
Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
select, separator
 
Fields inherited from class net.sf.saxon.instruct.Instruction
children
 
Constructor Summary
FixedAttribute(int nameCode, int validationAction, SimpleType schemaType, int annotation)
          Construct an Attribute instruction
 
Method Summary
 void display(int level, NamePool pool)
          Display this instruction as an expression, for diagnostics
protected  int evaluateNameCode(XPathContext context)
           
 SequenceType getResultType()
          Get the static type of the value returned by the instruction
 TailCall processLeavingTail(XPathContext context)
          Process this instruction
 void promoteInst(PromotionOffer offer)
          Offer promotion for subexpressions.
 void setInstructionDetails(Controller controller, NamePool namePool, InstructionDetails details)
          Get the name of this instruction
 void setNoSpecialChars()
          Indicate that the attribute value contains no special characters that might need escaping
 void setRejectDuplicates()
          Indicate that two attributes with the same name are not acceptable.
 void typeCheck(StaticContext env)
           
 
Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
analyze, evaluateItem, expandChildren, getXPathExpressions, setSelect, setSeparator
 
Methods inherited from class net.sf.saxon.instruct.ExprInstruction
effectiveBooleanValue, evaluateAsString, getCardinality, getDependencies, getItemType, getSpecialProperties, getSubExpressions, iterate, promote, simplify
 
Methods inherited from class net.sf.saxon.instruct.Instruction
assembleParams, assembleTunnelParams, getChildren, getColumnNumber, getInstructionDetails, getInstructionName, getLineNumber, getPublicId, getSystemId, getSystemId, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setSourceLocation, styleError, styleError
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FixedAttribute

public FixedAttribute(int nameCode,
                      int validationAction,
                      SimpleType schemaType,
                      int annotation)
Construct an Attribute instruction

Parameters:
nameCode - Represents the attribute name
annotation - Integer code identifying the type named in the type attribute of the instruction - zero if the attribute was not present
Method Detail

setRejectDuplicates

public void setRejectDuplicates()
Indicate that two attributes with the same name are not acceptable. (This option is set in XQuery, but not in XSLT)


setNoSpecialChars

public void setNoSpecialChars()
Indicate that the attribute value contains no special characters that might need escaping


setInstructionDetails

public void setInstructionDetails(Controller controller,
                                  NamePool namePool,
                                  InstructionDetails details)
Get the name of this instruction

Specified by:
setInstructionDetails in class Instruction

getResultType

public SequenceType getResultType()
Description copied from class: Instruction
Get the static type of the value returned by the instruction

Overrides:
getResultType in class Instruction
Returns:
the SequenceType that the returned value will conform to.

promoteInst

public void promoteInst(PromotionOffer offer)
                 throws XPathException
Offer promotion for subexpressions. 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.

Specified by:
promoteInst in class ExprInstruction
Parameters:
offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression
Throws:
XPathException - if any error is detected

typeCheck

public void typeCheck(StaticContext env)
               throws XPathException
Specified by:
typeCheck in class SimpleNodeConstructor
XPathException

evaluateNameCode

protected int evaluateNameCode(XPathContext context)
Overrides:
evaluateNameCode in class SimpleNodeConstructor

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws javax.xml.transform.TransformerException
Process this instruction

Specified by:
processLeavingTail in class Instruction
Parameters:
context - the dynamic context of the transformation
Returns:
a TailCall to be executed by the caller, always null for this instruction
javax.xml.transform.TransformerException

display

public void display(int level,
                    NamePool pool)
Display this instruction as an expression, for diagnostics

Specified by:
display in interface Expression
Overrides:
display in class SimpleNodeConstructor
Parameters:
level - indentation level for this expression