net.sf.saxon.instruct
Class Assign

java.lang.Object
  extended bynet.sf.saxon.expr.ComputedExpression
      extended bynet.sf.saxon.instruct.Instruction
          extended bynet.sf.saxon.instruct.GeneralVariable
              extended bynet.sf.saxon.instruct.Assign
All Implemented Interfaces:
Binding, BindingReference, Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator

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:
Serialized Form

Field Summary
 
Fields inherited from class net.sf.saxon.instruct.GeneralVariable
nameCode
 
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
Assign()
           
 
Method Summary
 ValueRepresentation evaluateVariable(XPathContext context)
          Evaluate the variable (method exists only to satisfy the interface)
 void fixup(Binding binding)
          Fix up this binding reference to a binding
 int getInstructionNameCode()
          Get the name of this instruction for diagnostic and tracing purposes
 TailCall processLeavingTail(XPathContext context)
          ProcessLeavingTail: called to do the real work of this instruction.
 void setStaticType(SequenceType type, Value constantValue, int properties)
          Fix up the static type of this variable reference; optionally, supply a constant value for the variable.
 
Methods inherited from class net.sf.saxon.instruct.GeneralVariable
analyze, display, evaluateItem, getCardinality, getItemType, getNameCode, getRequiredType, getSelectExpression, getSelectValue, getSlotNumber, getVariableFingerprint, getVariableName, init, isAssignable, isGlobal, isRequiredParam, isTunnelParam, iterate, iterateSubExpressions, promoteInst, setAssignable, setNameCode, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableName, simplify
 
Methods inherited from class net.sf.saxon.instruct.Instruction
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process, promote
 
Methods inherited from class net.sf.saxon.expr.ComputedExpression
adoptChildExpression, checkPermittedContents, 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

Assign

public Assign()
Method Detail

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

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 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