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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FilterExpression
public final class 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 |
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Fields inherited from class net.sf.saxon.expr.ComputedExpression |
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lineNumber, NO_ARGUMENTS, staticProperties |
Constructor Summary | |
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FilterExpression(Expression start,
Expression filter)
Constructor |
Method Summary | |
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Expression |
analyze(StaticContext env)
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)
Diagnostic print of expression structure |
boolean |
equals(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 |
Expression[] |
getSubExpressions()
Get the immediate subexpressions of this expression |
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 |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify()
Simplify an expression |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
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computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getDependencies, getIntrinsicDependencies, getLineNumber, getSpecialProperties, markTailFunctionCalls, setLineNumber, typeError |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FilterExpression(Expression start, Expression filter) throws XPathException
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
XPathException
Method Detail |
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public ItemType getItemType()
public Expression getBaseExpression()
public Expression getFilter()
public boolean isPositional()
public Expression simplify() throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if any failure occurspublic Expression analyze(StaticContext env) throws XPathException
env
- the static context
XPathException
- if an error is discovered during this phase
(typically a type error)public Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- details of the promotion that is possible
XPathException
- if any error is detectedpublic Expression[] getSubExpressions()
getSubExpressions
in interface Expression
getSubExpressions
in class ComputedExpression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public boolean equals(Object other)
equals
in class Object
other
- the expression to be compared with this one
public int hashCode()
hashCode
in class Object
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- 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)
level
- the indentation level
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