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java.lang.Object
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+--net.sf.saxon.expr.ComputedExpression
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+--net.sf.saxon.expr.FilterExpression
A FilterExpression contains a base expression and a filter predicate, which may be an integer expression (positional filter), or a boolean expression (qualifier)
| 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 | |
FilterExpression(Expression start,
Expression filter,
StaticContext env)
Constructor |
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| Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Get the static cardinality of this expression |
int |
computeDependencies()
Determine which aspects of the context the expression depends on. |
int |
computeSpecialProperties()
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 |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Expression |
getBaseExpression()
Get the underlying expression |
Expression |
getFilter()
Get the filter expression |
ItemType |
getItemType()
Get the data type of the items returned |
int |
hashCode()
get HashCode for comparing two expressions |
boolean |
isPositional()
Determine if the filter is positional |
SequenceIterator |
iterate(XPathContext context)
Iterate over the results, returning them in the correct order |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify(StaticContext env)
Simplify an expression |
| Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public FilterExpression(Expression start,
Expression filter,
StaticContext env)
throws StaticError
start - A node-set expression denoting the absolute or relative set of nodes from which the
navigation path should start.filter - An expression defining the filter predicate| Method Detail |
public ItemType getItemType()
public Expression getBaseExpression()
public Expression getFilter()
public boolean isPositional()
public Expression simplify(StaticContext env)
throws XPathException
simplify in interface Expressionsimplify in class ComputedExpressionXPathException - if any failure occurs
public Expression analyze(StaticContext env,
ItemType contextItemType)
throws XPathException
env - the static contextcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
XPathException
public Expression promote(PromotionOffer offer)
throws XPathException
promote in interface Expressionpromote in class ComputedExpressionoffer - details of the promotion that is possible
XPathException - if any error is detectedpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions in interface ExpressioniterateSubExpressions in class ComputedExpressionpublic int computeCardinality()
computeCardinality in class ComputedExpressionpublic int computeSpecialProperties()
computeSpecialProperties in class ComputedExpressionpublic boolean equals(java.lang.Object other)
equals in class java.lang.Objectother - the expression to be compared with this one
public int hashCode()
hashCode in class java.lang.Object
public SequenceIterator iterate(XPathContext context)
throws XPathException
iterate in interface Expressioniterate in class ComputedExpressioncontext - the dynamic context for the evaluation
XPathException - if any dynamic error occurspublic int computeDependencies()
computeDependencies in class ComputedExpression
public void display(int level,
NamePool pool,
java.io.PrintStream out)
level - the indentation levelout - pool - NamePool used to expand any names appearing in the expression
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