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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.xpath.expr.Expr
org.basex.query.xpath.expr.Filter
public final class Filter
Filter Expression filtering a nodeset. This Expression is invalid for other types as nodesets.
Constructor Summary | |
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Filter(Expr e,
Preds p)
Constructor. |
Method Summary | |
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java.lang.String |
color()
Returns a string description of the expression. |
Expr |
comp(XPContext ctx)
Optimizes the expression. |
Nod |
eval(XPContext ctx)
Evaluates the expression with the specified context set. |
void |
plan(Serializer ser)
Recursively sends the abstract syntax of this expression to the specified serializer. |
java.lang.String |
toString()
|
boolean |
usesPos()
Checks whether this Expression (or its children) make use of the position parameter. |
boolean |
usesSize()
Checks whether this Expression (or its children) make use of the setsize parameter. |
Methods inherited from class org.basex.query.xpath.expr.Expr |
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indexEquivalent, indexSizes, returnedValue, sameAs |
Methods inherited from class org.basex.query.ExprInfo |
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info, name |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Filter(Expr e, Preds p)
e
- Expression (has to result in a nodeset!)p
- Predicate to filter nodesetMethod Detail |
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public Nod eval(XPContext ctx) throws QueryException
Expr
eval
in class Expr
ctx
- query context
QueryException
- evaluation exceptionpublic boolean usesSize()
Expr
usesSize
in class Expr
public boolean usesPos()
Expr
usesPos
in class Expr
public Expr comp(XPContext ctx) throws QueryException
Expr
comp
in class Expr
ctx
- expression context
QueryException
- evaluation exceptionpublic void plan(Serializer ser) throws java.io.IOException
ExprInfo
plan
in class ExprInfo
ser
- serializer
java.io.IOException
- exceptionpublic java.lang.String color()
ExprInfo
ExprInfo.toString()
method, the current expressions aren't included
in the output.
color
in class ExprInfo
public java.lang.String toString()
toString
in class ExprInfo
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