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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.xpath.expr.Expr
org.basex.query.xpath.locpath.LocPath
public abstract class LocPath
LocationPath (absolute or relative).
Field Summary | |
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Steps |
steps
List of location steps. |
Constructor Summary | |
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LocPath()
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Method Summary | |
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void |
addPosPred(XPContext ctx)
Limit evaluation of predicates to first hit if only existence of path has to be checked. |
boolean |
checkAxes()
Checks if the specified location step has suitable index axes. |
java.lang.String |
color()
Returns a string description of the expression. |
Expr |
comp(XPContext ctx)
Optimizes the expression. |
abstract Nod |
eval(XPContext ctx)
Evaluates the expression with the specified context set. |
IndexToken |
indexable(XPContext ctx,
Expr exp,
Comp cmp)
Checks if the path is indexable. |
LocPath |
invertPath(Step curr)
Inverts a location path. |
void |
plan(Serializer ser)
Recursively sends the abstract syntax of this expression to the specified serializer. |
boolean |
sameAs(Expr cmp)
Checks current and specified expression for equivalence. |
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 |
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 |
Field Detail |
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public Steps steps
Constructor Detail |
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public LocPath()
Method Detail |
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public abstract Nod eval(XPContext ctx) throws QueryException
Expr
eval
in class Expr
ctx
- query context
QueryException
- evaluation exceptionpublic final Expr comp(XPContext ctx) throws QueryException
Expr
comp
in class Expr
ctx
- expression context
QueryException
- evaluation exceptionpublic final boolean sameAs(Expr cmp)
Expr
sameAs
in class Expr
cmp
- expression to be compared
public final boolean usesSize()
Expr
usesSize
in class Expr
public final boolean usesPos()
Expr
usesPos
in class Expr
public final void addPosPred(XPContext ctx)
ctx
- query contextpublic final IndexToken indexable(XPContext ctx, Expr exp, Comp cmp)
ctx
- query contextexp
- expression which must be a literalcmp
- comparator
public final boolean checkAxes()
public final LocPath invertPath(Step curr)
curr
- current location step
public final void plan(Serializer ser) throws java.io.IOException
ExprInfo
plan
in class ExprInfo
ser
- serializer
java.io.IOException
- exceptionpublic final 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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