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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.path.Path
org.basex.query.path.AxisPath
public class AxisPath
Axis Path expression.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.basex.query.expr.Expr |
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Expr.Use |
Field Summary | |
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Step[] |
step
Expression list. |
Fields inherited from class org.basex.query.path.Path |
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root |
Method Summary | |
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AxisPath |
addPred(Expr pred)
Adds a predicate to the last step. |
Expr |
addText(QueryContext ctx)
Optionally adds a text node to an expression for potential index rewriting. |
Expr |
comp(QueryContext ctx)
Optimizes and compiles the expression. |
static AxisPath |
get(Expr r,
Step... st)
Constructor. |
AxisPath |
invertPath(Expr r,
Step curr)
Inverts a location path. |
Iter |
iter(QueryContext ctx)
Evaluates the expression and returns an iterator on the resulting items. |
void |
plan(Serializer ser)
Recursively sends the abstract syntax of this expression to the specified serializer. |
boolean |
removable(Var v,
QueryContext ctx)
Checks if the specified variable is removable. |
Expr |
remove(Var v)
Removes the specified variable in a sub expression. |
Return |
returned(QueryContext ctx)
Indicates the return type of an expression. |
boolean |
sameAs(Expr cmp)
Checks the current and specified expression for equality. |
long |
size(QueryContext ctx)
Returns the sequence size or 1. |
String |
toString()
|
boolean |
uses(Expr.Use u,
QueryContext ctx)
Indicates if an expression uses the specified type. |
Methods inherited from class org.basex.query.path.Path |
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color, toString |
Methods inherited from class org.basex.query.expr.Expr |
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atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, test, v |
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 Step[] step
Method Detail |
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public static final AxisPath get(Expr r, Step... st)
r
- root expression; can be nullst
- location steps; will at least have one entry
public final Expr comp(QueryContext ctx) throws QueryException
Expr
comp
in class Path
ctx
- query context
QueryException
- query exceptionpublic Iter iter(QueryContext ctx) throws QueryException
Expr
Expr.atomic(org.basex.query.QueryContext)
must be implemented.
iter
in class Expr
ctx
- query context
QueryException
- query exceptionpublic final long size(QueryContext ctx)
Expr
size
in class Expr
ctx
- query context
public final AxisPath invertPath(Expr r, Step curr)
r
- new root nodecurr
- current location step
public final AxisPath addPred(Expr pred)
pred
- predicate to be added
public final Expr addText(QueryContext ctx) throws QueryException
Expr
addText
in class Expr
ctx
- query context
QueryException
- query exceptionpublic final boolean uses(Expr.Use u, QueryContext ctx)
Expr
true
is returned by default and thus assumed as "worst-case".
uses
in class Expr
u
- use type to be checkedctx
- query context
public final boolean removable(Var v, QueryContext ctx)
Expr
removable
in class Expr
v
- variable to be removedctx
- query context
public final Expr remove(Var v)
Expr
remove
in class Path
v
- variable to be removed
public final Return returned(QueryContext ctx)
Expr
returned
in class Expr
ctx
- query context
public final boolean sameAs(Expr cmp)
Expr
sameAs
in class Expr
cmp
- expression to be compared
public final void plan(Serializer ser) throws IOException
ExprInfo
plan
in class ExprInfo
ser
- serializer
IOException
- I/O exceptionpublic final String toString()
toString
in class ExprInfo
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