net.sf.saxon.instruct
Class FixedAttribute

java.lang.Object
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  +--net.sf.saxon.instruct.Instruction
        |
        +--net.sf.saxon.instruct.ExprInstruction
              |
              +--net.sf.saxon.instruct.SimpleNodeConstructor
                    |
                    +--net.sf.saxon.instruct.FixedAttribute

All Implemented Interfaces:

Expression, Instr, Locatable, 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)
int	getCardinality()           Determine the static cardinality of the expression.
java.lang.String	getInstructionName()           Get the name of this instruction
ItemType	getItemType()           Determine the data type of the expression, if possible.
TailCall	processLeavingTail(XPathContext context)           Process 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, promoteInst, setSelect, setSeparator

 

Methods inherited from class net.sf.saxon.instruct.ExprInstruction

effectiveBooleanValue, evaluateAsString, getDependencies, getSpecialProperties, getSubExpressions, iterate, promote, simplify

 

Methods inherited from class net.sf.saxon.instruct.Instruction

assembleParams, assembleTunnelParams, displayChildren, dynamicError, dynamicError, getChildren, getColumnNumber, getExecutable, getInstructionNamespace, getLineNumber, getPublicId, getSourceLocator, getSystemId, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setExecutable, setSourceLocation

 

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

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

getInstructionName

public java.lang.String getInstructionName()

Get the name of this instruction

Specified by:

getInstructionName in class Instruction

getItemType

public ItemType getItemType()

Description copied from interface: Expression

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.

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class Instruction

Returns:

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

getCardinality

public int getCardinality()

Description copied from interface: Expression

Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.

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

Specified by:

getCardinality in interface Expression

Overrides:

getCardinality in class Instruction

Returns:

one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).

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 interface Instr

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