Package net.sf.saxon.instruct
Class Assign
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
net.sf.saxon.instruct.GeneralVariable
net.sf.saxon.instruct.Assign
- All Implemented Interfaces:
Serializable
,SourceLocator
,Binding
,BindingReference
,Container
,Expression
,TailCallReturner
,InstructionInfoProvider
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:
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Field Summary
Fields inherited from class net.sf.saxon.instruct.GeneralVariable
evaluationMode, nameCode, referenceCount, requiredType, select, slotNumber
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionevaluateVariable
(XPathContext context) Evaluate the variable (method exists only to satisfy the interface)void
Fix up this binding reference to a bindingint
Get the name of this instruction for diagnostic and tracing purposesint
Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions.processLeavingTail
(XPathContext context) ProcessLeavingTail: called to do the real work of this instruction.promote
(PromotionOffer offer) Offer promotion for this subexpression.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
display, evaluateItem, getCardinality, getItemType, getLocalSlotNumber, getNameCode, getRequiredType, getSelectExpression, getSelectValue, getSlotNumber, getVariableFingerprint, getVariableName, init, isAssignable, isGlobal, isImplicitlyRequiredParam, isRequiredParam, isTunnelParam, iterate, iterateSubExpressions, optimize, promoteInst, replaceSubExpression, setAssignable, setImplicitlyRequiredParam, setNameCode, setReferenceCount, setRequiredParam, setRequiredType, setSelectExpression, setSlotNumber, setTunnel, setVariableName, simplify, typeCheck
Methods inherited from class net.sf.saxon.instruct.Instruction
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process
Methods inherited from class net.sf.saxon.expr.ComputedExpression
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, setParentExpression, suppressValidation, 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
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Constructor Details
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Assign
public Assign()
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Method Details
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setStaticType
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 interfaceBindingReference
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fixup
Description copied from interface:BindingReference
Fix up this binding reference to a binding- Specified by:
fixup
in interfaceBindingReference
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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 classComputedExpression
- Returns:
- a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
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promote
Offer promotion for this subexpression. This needs careful handling in the case of saxon:assign- Specified by:
promote
in interfaceExpression
- Overrides:
promote
in classInstruction
- 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
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getInstructionNameCode
public int getInstructionNameCode()Get the name of this instruction for diagnostic and tracing purposes- Overrides:
getInstructionNameCode
in classGeneralVariable
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processLeavingTail
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 interfaceTailCallReturner
- Specified by:
processLeavingTail
in classInstruction
- 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
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evaluateVariable
Evaluate the variable (method exists only to satisfy the interface)- Specified by:
evaluateVariable
in interfaceBinding
- Throws:
XPathException
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