Class Assign

All Implemented Interfaces:
Serializable, SourceLocator, Binding, BindingReference, Container, Expression, TailCallReturner, InstructionInfoProvider

public class Assign extends GeneralVariable implements BindingReference
saxon:assign element in stylesheet. The saxon:assign element has mandatory attribute name and optional attribute expr. It also allows xsl:extension-element-prefixes etc.
See Also:
  • Constructor Details

    • Assign

      public Assign()
  • Method Details

    • setStaticType

      public void setStaticType(SequenceType type, Value constantValue, int properties)
      Description copied from interface: BindingReference
      Fix up the static type of this variable reference; optionally, supply a constant value for the variable. Also supplies other static properties of the expression to which the variable is bound, for example whether it is an ordered node-set.
      Specified by:
      setStaticType in interface BindingReference
    • fixup

      public void fixup(Binding binding)
      Description copied from interface: BindingReference
      Fix up this binding reference to a binding
      Specified by:
      fixup in interface BindingReference
    • getIntrinsicDependencies

      public int getIntrinsicDependencies()
      Description copied from class: ComputedExpression
      Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. For example, position() has an intrinsic dependency on the context position, while (position()+1) does not. The default implementation of the method returns 0, indicating "no dependencies".
      Overrides:
      getIntrinsicDependencies in class ComputedExpression
      Returns:
      a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
    • promote

      public Expression promote(PromotionOffer offer) throws XPathException
      Offer promotion for this subexpression. This needs careful handling in the case of saxon:assign
      Specified by:
      promote in interface Expression
      Overrides:
      promote in class Instruction
      Parameters:
      offer - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression
      Returns:
      if the offer is not accepted, return this expression unchanged. Otherwise return the result of rewriting the expression to promote this subexpression
      Throws:
      XPathException - if any error is detected
    • getInstructionNameCode

      public int getInstructionNameCode()
      Get the name of this instruction for diagnostic and tracing purposes
      Overrides:
      getInstructionNameCode in class GeneralVariable
    • processLeavingTail

      public TailCall processLeavingTail(XPathContext context) throws XPathException
      Description copied from class: Instruction
      ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.
      Specified by:
      processLeavingTail in interface TailCallReturner
      Specified by:
      processLeavingTail in class Instruction
      Parameters:
      context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.
      Returns:
      null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.
      Throws:
      XPathException
    • evaluateVariable

      public ValueRepresentation evaluateVariable(XPathContext context) throws XPathException
      Evaluate the variable (method exists only to satisfy the interface)
      Specified by:
      evaluateVariable in interface Binding
      Throws:
      XPathException