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
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


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