FixedAttribute

java.lang.Object
- net.sf.saxon.expr.Expression
- - net.sf.saxon.instruct.Instruction
  - - net.sf.saxon.instruct.SimpleNodeConstructor
    - - net.sf.saxon.instruct.AttributeCreator
      - net.sf.saxon.instruct.FixedAttribute

All Implemented Interfaces:

java.io.Serializable, javax.xml.transform.SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfo, org.xml.sax.Locator
```
public final class FixedAttribute
extends AttributeCreator
```
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. The value of the attribute is in general computed at run-time.

See Also:

Serialized Form

Field Summary
- Fields inherited from class net.sf.saxon.expr.Expression
  EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
- Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
  select

Constructor Summary

Constructors
Constructor	Description
`FixedAttribute(int nameCode, int validationAction, SimpleType schemaType, int annotation)`	Construct an Attribute instruction

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole)`	Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type.
`Expression`	`copy()`	Copy an expression.
`Item`	`evaluateItem(XPathContext context)`	Evaluate as an expression.
`int`	`evaluateNameCode(XPathContext context)`	Run-time method to compute the name of the node being constructed.
`void`	`explain(ExpressionPresenter out)`	Diagnostic print of expression structure.
`int`	`getAttributeNameCode()`	Get the name pool name code of the attribute to be constructed
`int`	`getCardinality()`	Determine the static cardinality of the expression.
`int`	`getInstructionNameCode()`	Get the name of this instruction (return 'xsl:attribute')
`ItemType`	`getItemType(TypeHierarchy th)`	Get the item type of the items returned by evaluating this instruction
`void`	`localTypeCheck(ExpressionVisitor visitor, ItemType contextItemType)`	Method to perform type-checking specific to the kind of instruction
`TailCall`	`processLeavingTail(XPathContext context)`	Process this instruction
`void`	`setSelect(Expression select, Configuration config)`	Set the expression defining the value of the attribute.

Methods inherited from class net.sf.saxon.instruct.AttributeCreator
getAnnotation, getOptions, getSchemaType, getValidationAction, setAnnotation, setNoSpecialChars, setOptions, setRejectDuplicates, setSchemaType, setValidationAction

Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, computeDependencies, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, findParentOf, getColumnNumber, getColumnNumber, getContainer, getDependencies, getExecutable, getHostLanguage, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isUpdatingExpression, iterateEvents, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toString, typeError

Methods inherited from class net.sf.saxon.instruct.Instruction
assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getImplementationMethod, getSourceLocator, isXSLT, process, promote

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
checkContent, computeCardinality, computeSpecialProperties, createsNewNodes, expandChildren, getSelect, iterate, iterateSubExpressions, optimize, promoteInst, replaceSubExpression, simplify, typeCheck

Methods inherited from interface javax.xml.transform.SourceLocator
getColumnNumber, getLineNumber, getPublicId, getSystemId

- Constructor Detail
  - FixedAttribute
```
public FixedAttribute(int nameCode,
                      int validationAction,
                      SimpleType schemaType,
                      int annotation)
```
    Construct an Attribute instruction
    
    Parameters:
    
    nameCode - Represents the attribute name
    
    validationAction - the validation required, for example strict or lax
    
    schemaType - the schema type against which validation is required, null if not applicable
    
    annotation - Integer code identifying the type named in the type attribute of the instruction - zero if the attribute was not present
- Method Detail
  - getInstructionNameCode
```
public int getInstructionNameCode()
```
    Get the name of this instruction (return 'xsl:attribute')
    
    Overrides:
    
    getInstructionNameCode in class Instruction
    
    Returns:
    
    a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace
  - setSelect
```
public void setSelect(Expression select,
                      Configuration config)
               throws XPathException
```
    Set the expression defining the value of the attribute. If this is a constant, and if validation against a schema type was requested, the validation is done immediately.
    
    Overrides:
    
    setSelect in class SimpleNodeConstructor
    
    Parameters:
    
    select - The expression defining the content of the attribute
    
    config - The Saxon configuration
    
    Throws:
    
    XPathException - if the expression is a constant, and validation is requested, and the constant doesn't match the required type.
  - getAttributeNameCode
```
public int getAttributeNameCode()
```
    Get the name pool name code of the attribute to be constructed
    
    Returns:
    
    the attribute's name code
  - getItemType
```
public ItemType getItemType(TypeHierarchy th)
```
    Description copied from class: Instruction
    
    Get the item type of the items returned by evaluating this instruction
    
    Overrides:
    
    getItemType in class Instruction
    
    Parameters:
    
    th - the type hierarchy cache
    
    Returns:
    
    the static item type of the instruction
  - getCardinality
```
public int getCardinality()
```
    Description copied from class: 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.
    
    Overrides:
    
    getCardinality in class Expression
    
    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).
  - copy
```
public Expression copy()
```
    Copy an expression. This makes a deep copy.
    
    Specified by:
    
    copy in class Expression
    
    Returns:
    
    the copy of the original expression
  - localTypeCheck
```
public void localTypeCheck(ExpressionVisitor visitor,
                           ItemType contextItemType)
```
    Description copied from class: SimpleNodeConstructor
    
    Method to perform type-checking specific to the kind of instruction
    
    Specified by:
    
    localTypeCheck in class SimpleNodeConstructor
    
    Parameters:
    
    visitor - an expression visitor
    
    contextItemType - the static type of the context item
  - evaluateNameCode
```
public int evaluateNameCode(XPathContext context)
```
    Description copied from class: SimpleNodeConstructor
    
    Run-time method to compute the name of the node being constructed. This is overridden for nodes that have a name. The default implementation returns -1, which is suitable for unnamed nodes such as comments
    
    Overrides:
    
    evaluateNameCode in class SimpleNodeConstructor
    
    Parameters:
    
    context - the XPath dynamic evaluation context
    
    Returns:
    
    the name pool nameCode identifying the name of the constructed node
  - checkPermittedContents
```
public void checkPermittedContents(SchemaType parentType,
                                   StaticContext env,
                                   boolean whole)
                            throws XPathException
```
    Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. It's always OK to say yes, since the check will be repeated at run-time. The process of checking element and attribute constructors against the content model of a complex type also registers the type of content expected of those constructors, so the static validation can continue recursively.
    
    Overrides:
    
    checkPermittedContents in class Expression
    
    Parameters:
    
    parentType - the "given complex type": the method is checking that the nodes returned by this expression are acceptable members of the content model of this type
    
    env - the static context
    
    whole - if true, we want to check that the value of this expression satisfies the content model as a whole; if false we want to check that the value of the expression is acceptable as one part of the content
    
    Throws:
    
    XPathException - if the value delivered by this expression cannot be part of the content model of the given type
  - processLeavingTail
```
public TailCall processLeavingTail(XPathContext context)
                            throws XPathException
```
    Process this instruction
    
    Specified by:
    
    processLeavingTail in interface TailCallReturner
    
    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
    
    Throws:
    
    XPathException
  - evaluateItem
```
public Item evaluateItem(XPathContext context)
                  throws XPathException
```
    Description copied from class: SimpleNodeConstructor
    
    Evaluate as an expression. We rely on the fact that when these instructions are generated by XQuery, there will always be a valueExpression to evaluate the content
    
    Specified by:
    
    evaluateItem in interface EvaluableItem
    
    Overrides:
    
    evaluateItem in class SimpleNodeConstructor
    
    Parameters:
    
    context - The context in which the expression is to be evaluated
    
    Returns:
    
    the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence
    
    Throws:
    
    XPathException - if any dynamic error occurs evaluating the expression
  - explain
```
public void explain(ExpressionPresenter out)
```
    Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.
    
    Specified by:
    
    explain in class Expression
    
    Parameters:
    
    out - the expression presenter used to display the structure

Class FixedAttribute

Field Summary

Fields inherited from class net.sf.saxon.expr.Expression

Fields inherited from class net.sf.saxon.instruct.SimpleNodeConstructor

Constructor Summary

Method Summary

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

Methods inherited from class net.sf.saxon.expr.Expression

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.SourceLocator

Constructor Detail

FixedAttribute

Method Detail

getInstructionNameCode

setSelect

getAttributeNameCode

getItemType

getCardinality

copy

localTypeCheck

evaluateNameCode

checkPermittedContents

processLeavingTail

evaluateItem

explain