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java.lang.Object | +--net.sf.saxon.instruct.Instruction | +--net.sf.saxon.instruct.ExprInstruction | +--net.sf.saxon.instruct.TraceInstruction
A run-time instruction which wraps a real instruction and traces its entry and exit to the TraceListener
Field Summary |
Fields inherited from class net.sf.saxon.instruct.Instruction |
children |
Constructor Summary | |
TraceInstruction(Instruction child)
Create a Trace instruction |
Method Summary | |
Expression |
analyze(StaticContext env)
Perform static analysis of an expression and its subexpressions. |
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure. |
Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item. |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
java.lang.String |
getInstructionName()
Get the name of the instruction being traced |
java.lang.String |
getInstructionNamespace()
Get the namespace URI of the instruction being traced |
int |
getLineNumber()
Get the line number of the instruction being traced |
int |
getSpecialProperties()
Get the static properties of this expression (other than its type). |
java.lang.String |
getSystemId()
Get the system ID of the module in which this instruction is located |
protected void |
getXPathExpressions(java.util.List list)
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) |
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
TailCall |
processLeavingTail(XPathContext context)
Execute this instruction, with the possibility of returning tail calls if there are any. |
protected void |
promoteInst(PromotionOffer offer)
Handle promotion offers, that is, non-local tree rewrites. |
void |
setProperty(java.lang.String name,
java.lang.Object value)
Set a property to be supplied to the TraceListener when this instruction is executed |
Expression |
simplify()
Simplify an expression. |
Methods inherited from class net.sf.saxon.instruct.ExprInstruction |
effectiveBooleanValue, evaluateAsString, getSubExpressions, promote |
Methods inherited from class net.sf.saxon.instruct.Instruction |
assembleParams, assembleTunnelParams, displayChildren, dynamicError, dynamicError, getCardinality, getChildren, getColumnNumber, getExecutable, getItemType, getPublicId, getSourceLocator, process, processChildren, processChildrenLeavingTail, recoverableError, setChildren, setExecutable, setSourceLocation |
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.Expression |
getCardinality, getItemType |
Constructor Detail |
public TraceInstruction(Instruction child)
child
- the "real" instruction to be tracedMethod Detail |
public void setProperty(java.lang.String name, java.lang.Object value)
name
- the name of the propertyvalue
- the value of the propertypublic java.lang.String getSystemId()
getSystemId
in interface javax.xml.transform.SourceLocator
getSystemId
in class Instruction
public int getLineNumber()
getLineNumber
in interface javax.xml.transform.SourceLocator
getLineNumber
in class Instruction
public java.lang.String getInstructionName()
getInstructionName
in class Instruction
public java.lang.String getInstructionNamespace()
getInstructionNamespace
in class Instruction
public TailCall processLeavingTail(XPathContext context) throws javax.xml.transform.TransformerException
processLeavingTail
in interface Instr
processLeavingTail
in class Instruction
context
- the dynamic execution context
javax.xml.transform.TransformerException
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class ExprInstruction
XPathException
- if an error is discovered during expression
rewritingpublic Expression analyze(StaticContext env) throws XPathException
This 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 Expression
analyze
in class ExprInstruction
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public int getDependencies()
StaticProperty.DEPENDS_ON_CONTEXT_ITEM
and
StaticProperty.DEPENDS_ON_CURRENT_ITEM
. The default implementation combines the intrinsic
dependencies of this expression with the dependencies of the subexpressions,
computed recursively. This is overridden for expressions such as FilterExpression
where a subexpression's dependencies are not necessarily inherited by the parent
expression.
getDependencies
in interface Expression
getDependencies
in class ExprInstruction
public int getSpecialProperties()
getSpecialProperties
in interface Expression
getSpecialProperties
in class ExprInstruction
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ExprInstruction
context
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ExprInstruction
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionprotected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class ExprInstruction
offer
- The type of rewrite being offered
XPathException
protected void getXPathExpressions(java.util.List list)
getXPathExpressions
in class ExprInstruction
list
- A list to be populated with the list of XPath expressionspublic void display(int level, NamePool pool)
level
- indentation level for this expression
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