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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.TailExpression
A TailExpression represents a FilterExpression of the form EXPR[position() > n] Here n is usually 2, but we allow other values
Nested Class Summary | |
static class |
TailExpression.TailIterator
|
Field Summary | |
(package private) Expression |
base
|
(package private) int |
start
|
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
TailExpression(Expression base,
int start)
Construct a TailExpression, representing a filter expression of the form $base[position() >= $start] |
Method Summary | |
Expression |
analyze(StaticContext env)
Perform static analysis of an expression and its subexpressions. |
int |
computeCardinality()
|
int |
computeSpecialProperties()
|
void |
display(int level,
NamePool pool)
Diagnostic print of expression structure. |
boolean |
equals(java.lang.Object other)
|
Expression |
getBaseExpression()
|
ItemType |
getItemType()
Determine the data type of the expression, if possible. |
int |
getStart()
|
Expression[] |
getSubExpressions()
Get the immediate sub-expressions of this expression. |
int |
hashCode()
|
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
Expression |
promote(PromotionOffer offer)
Offer promotion for this subexpression. |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, simplify, typeError |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
Expression base
int start
Constructor Detail |
public TailExpression(Expression base, int start)
base
- the expression to be filteredstart
- the position (1-based) of the first item to be includedMethod Detail |
public Expression analyze(StaticContext env)
Expression
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.
env
- the static context of the expression
public Expression promote(PromotionOffer offer) throws XPathException
ComputedExpression
promote
in interface Expression
promote
in class ComputedExpression
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
XPathException
- if any error is detectedpublic int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public ItemType getItemType()
Expression
This method should always return a result, though it may be the best approximation that is available at the time.
public int computeCardinality()
computeCardinality
in class ComputedExpression
public Expression[] getSubExpressions()
ComputedExpression
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
public Expression getBaseExpression()
public int getStart()
public boolean equals(java.lang.Object other)
public int hashCode()
public SequenceIterator iterate(XPathContext context) throws XPathException
ComputedExpression
iterate
in interface Expression
iterate
in class ComputedExpression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic void display(int level, NamePool pool)
Expression
level
- indentation level for this expression
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