## net.sf.saxon.instruct
Class FixedAttribute

    java.lang.Object
      net.sf.saxon.expr.ComputedExpression
          net.sf.saxon.instruct.Instruction
              net.sf.saxon.instruct.SimpleNodeConstructor
                  net.sf.saxon.instruct.FixedAttribute

All Implemented Interfaces:
  Container, Expression, InstructionInfoProvider, 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. 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.instruct.SimpleNodeConstructor
`select`

Fields inherited from class net.sf.saxon.expr.ComputedExpression
`locationId, staticProperties`

Fields inherited from interface net.sf.saxon.expr.Expression
`EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD`

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

Method Summary
`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.
`void` `display(int level, NamePool pool, java.io.PrintStream out)` Display this instruction as an expression, for diagnostics
`Item` `evaluateItem(XPathContext context)` Evaluate as an expression.
`protected int` `evaluateNameCode(XPathContext context)`
`int` `getCardinality()` Determine the static cardinality of the expression.
`InstructionInfo` `getInstructionInfo()` Get InstructionInfo for this expression
`int` `getInstructionNameCode()` Get the name of this instruction (return 'xsl:attribute')
`ItemType` `getItemType()` Get the item type of the items returned by evaluating this instruction
`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` `setSelect(Expression select)` Set the expression defining the value of the attribute.
`void` `typeCheck(StaticContext env, ItemType contextItemType)`

Methods inherited from class net.sf.saxon.instruct.SimpleNodeConstructor
`analyze, checkContent, computeSpecialProperties, createsNewNodes, expandChildren, iterate, iterateSubExpressions, promoteInst, simplify`

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

Methods inherited from class net.sf.saxon.expr.ComputedExpression
`adoptChildExpression, computeDependencies, computeStaticProperties, dynamicError, dynamicError, getColumnNumber, getConstructType, getDependencies, getExecutable, getIntrinsicDependencies, getLineNumber, getLocationId, getParentExpression, getPublicId, getSpecialProperties, getSystemId, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, typeError, typeError`

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

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
  `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`

### 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

### setSelect

    public void setSelect(Expression select)
                   throws StaticError

  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
  Throws:
    `StaticError` - if the expression is a constant, and validation is requested, and the constant doesn't match the required type.

### getInstructionInfo

    public InstructionInfo getInstructionInfo()

  Description copied from class: `ComputedExpression`
  Get InstructionInfo for this expression

  Specified by:
    `getInstructionInfo` in interface `InstructionInfoProvider`
  Overrides:
    `getInstructionInfo` in class `Instruction`

### getItemType

    public ItemType getItemType()

  Description copied from class: `Instruction`
  Get the item type of the items returned by evaluating this instruction

  Specified by:
    `getItemType` in interface `Expression`
  Overrides:
    `getItemType` in class `Instruction`
  Returns:
    the static item type of the instruction

### getCardinality

    public int getCardinality()

  Description copied from class: `ComputedExpression`
  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.

  Specified by:
    `getCardinality` in interface `Expression`
  Overrides:
    `getCardinality` in class `ComputedExpression`
  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,
                          ItemType contextItemType)

  Specified by:
    `typeCheck` in class `SimpleNodeConstructor`

### evaluateNameCode

    protected int evaluateNameCode(XPathContext context)

  Overrides:
    `evaluateNameCode` in class `SimpleNodeConstructor`

### 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.

  Specified by:
    `checkPermittedContents` in interface `Expression`
  Overrides:
    `checkPermittedContents` in class `ComputedExpression`
  Throws:
    `XPathException`

### processLeavingTail

    public TailCall processLeavingTail(XPathContext context)
                                throws XPathException

  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
  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 `Expression`
  Overrides:
    `evaluateItem` in class `SimpleNodeConstructor`
  Throws:
    `XPathException`

### display

    public void display(int level,
                        NamePool pool,
                        java.io.PrintStream out)

  Display this instruction as an expression, for diagnostics

  Specified by:
    `display` in interface `Expression`
  Overrides:
    `display` in class `SimpleNodeConstructor`