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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.TraceWrapper
Created by IntelliJ IDEA. User: Mike Date: 08-Sep-2004 Time: 12:55:09 To change this template use File | Settings | File Templates.
| Field Summary |
| 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 | |
TraceWrapper()
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|
| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
I Perform static analysis of an expression and its subexpressions. |
int |
computeDependencies()
Get the static properties of this expression (other than its type). |
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 |
getDependencies()
Determine which aspects of the context the expression depends on. |
int |
getInstructionNameCode()
Get the namecode of the instruction for use in diagnostics |
ItemType |
getItemType()
Get the item type of the items returned by evaluating this instruction |
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate sub-expressions of this expression. |
TailCall |
processLeavingTail(XPathContext context)
Execute this instruction, with the possibility of returning tail calls if there are any. |
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, promote, promoteInst |
| Methods inherited from class net.sf.saxon.expr.ComputedExpression |
adoptChildExpression, computeStaticProperties, dynamicError, dynamicError, getCardinality, getColumnNumber, getConstructType, getExecutable, getIntrinsicDependencies, getLineNumber, getLocationId, getParentExpression, getPublicId, getSpecialProperties, getSystemId, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, 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 |
public TraceWrapper()
| Method Detail |
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class InstructionXPathException - if an error is discovered during expression
rewriting
public Expression analyze(StaticContext env,
ItemType contextItemType)
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 Expressionanalyze in class Instructionenv - the static context of the expression
XPathException - if an error is discovered during this phase
(typically a type error)
public TailCall processLeavingTail(XPathContext context)
throws XPathException
processLeavingTail in class Instructioncontext - the dynamic execution context
XPathExceptionpublic ItemType getItemType()
getItemType in interface ExpressiongetItemType in class Instructionpublic 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 ExpressiongetDependencies in class ComputedExpressionpublic int computeDependencies()
computeDependencies in class ComputedExpression
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
expressionpublic java.util.Iterator iterateSubExpressions()
ComputedExpression
iterateSubExpressions in interface ExpressioniterateSubExpressions in class ComputedExpressionpublic int getInstructionNameCode()
Instruction
getInstructionNameCode in class Instruction
public void display(int level,
NamePool pool,
java.io.PrintStream out)
level - indentation level for this expressionout - pool - NamePool used to expand any names appearing in the expression
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