Class FixedAttribute

All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, SequenceIterable, TailCallReturner, InstructionInfo, 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:
  • Constructor Details

    • 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 Details

    • 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