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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.instruct.Instruction
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+--net.sf.saxon.instruct.GeneralVariable
This class defines common behaviour across xsl:variable, xsl:param, and xsl:with-param; also saxon:assign
| Field Summary | |
protected int |
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 | |
GeneralVariable()
|
|
| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item. |
int |
getCardinality()
Get the cardinality of the result of this instruction. |
int |
getInstructionNameCode()
Get the namecode of the instruction for use in diagnostics |
ItemType |
getItemType()
Get the type of the result of this instruction. |
int |
getNameCode()
|
SequenceType |
getRequiredType()
|
Expression |
getSelectExpression()
|
Value |
getSelectValue(XPathContext context)
Evaluate the variable. |
int |
getSlotNumber()
|
int |
getVariableFingerprint()
Get the name of the variable (as a NamePool fingerprint) |
java.lang.String |
getVariableName()
|
void |
init(Expression select,
int nameCode)
|
boolean |
isAssignable()
Test whether it is permitted to assign to the variable using the saxon:assign extension element. |
boolean |
isGlobal()
|
boolean |
isRequiredParam()
|
boolean |
isTunnelParam()
|
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
java.util.Iterator |
iterateSubExpressions()
Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction) |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
void |
setAssignable(boolean assignable)
|
void |
setNameCode(int nameCode)
|
void |
setRequiredParam(boolean requiredParam)
|
void |
setRequiredType(SequenceType required)
|
void |
setSelectExpression(Expression select)
|
void |
setSlotNumber(int s)
|
void |
setTunnel(boolean tunnel)
|
void |
setVariableName(java.lang.String s)
|
Expression |
simplify(StaticContext env)
Simplify an expression. |
| Methods inherited from class net.sf.saxon.instruct.Instruction |
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getImplementationMethod, getInstructionInfo, getSourceLocator, process, processLeavingTail, promote |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Methods inherited from interface net.sf.saxon.expr.Binding |
evaluateVariable |
| Methods inherited from interface javax.xml.transform.SourceLocator |
getColumnNumber, getLineNumber, getPublicId, getSystemId |
| Field Detail |
protected int nameCode
| Constructor Detail |
public GeneralVariable()
| Method Detail |
public void init(Expression select,
int nameCode)
public void setSelectExpression(Expression select)
public Expression getSelectExpression()
public void setRequiredType(SequenceType required)
public SequenceType getRequiredType()
public void setNameCode(int nameCode)
public int getNameCode()
public void setAssignable(boolean assignable)
public void setRequiredParam(boolean requiredParam)
public void setTunnel(boolean tunnel)
public final boolean isAssignable()
public int getVariableFingerprint()
public ItemType getItemType()
getItemType in interface ExpressiongetItemType in class Instructionpublic int getCardinality()
getCardinality in interface ExpressiongetCardinality in class ComputedExpressionpublic boolean isGlobal()
public final boolean isRequiredParam()
public final boolean isTunnelParam()
public int getInstructionNameCode()
Instruction
getInstructionNameCode in class Instruction
public Expression simplify(StaticContext env)
throws XPathException
Instruction
simplify in interface Expressionsimplify in class InstructionXPathException - if an error is discovered during expression
rewriting
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
InstructionThis checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables will only be accurately known if they have been explicitly declared.
analyze in interface Expressionanalyze in class Instructionenv - the static context of the expression
XPathException - if an error is discovered during this phase
(typically a type error)
public Item evaluateItem(XPathContext context)
throws XPathException
evaluateItem in interface ExpressionevaluateItem in class Instructioncontext - The context in which the expression is to be evaluated
XPathException - if any dynamic error occurs evaluating the
expression
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class Instructioncontext - supplies the context for evaluation
XPathException - if any dynamic error occurs evaluating the
expression
public Value getSelectValue(XPathContext context)
throws XPathException
XPathException
protected void promoteInst(PromotionOffer offer)
throws XPathException
promoteInst in class Instructionoffer - The type of rewrite being offered
XPathExceptionpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions in interface ExpressioniterateSubExpressions in class ComputedExpression
public void display(int level,
NamePool pool,
java.io.PrintStream out)
display in interface Expressionlevel - indentation level for this expressionout - pool - NamePool used to expand any names appearing in the expressionpublic int getSlotNumber()
public void setSlotNumber(int s)
public void setVariableName(java.lang.String s)
public java.lang.String getVariableName()
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