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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.Arr
public abstract class Arr
Abstract array 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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Expr[] |
expr
Expression list. |
Method Summary | |
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Expr |
comp(QueryContext ctx)
Optimizes and compiles the expression. |
boolean |
duplicates(QueryContext ctx)
Returns true if the expression might yield duplicates and unsorted results. |
Expr |
indexEquivalent(IndexContext ic)
Returns an equivalent expression which accesses an index structure. |
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. |
boolean |
uses(Expr.Use u,
QueryContext ctx)
Indicates if an expression uses the specified type. |
Methods inherited from class org.basex.query.expr.Expr |
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addText, atomic, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, iter, returned, sameAs, size, test, v |
Methods inherited from class org.basex.query.ExprInfo |
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color, info, name, toString |
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 Expr[] expr
Method Detail |
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public Expr comp(QueryContext ctx) throws QueryException
Expr
comp
in class Expr
ctx
- query context
QueryException
- query exceptionpublic 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 boolean removable(Var v, QueryContext ctx)
Expr
removable
in class Expr
v
- variable to be removedctx
- query context
public Expr remove(Var v)
Expr
remove
in class Expr
v
- variable to be removed
public Expr indexEquivalent(IndexContext ic) throws QueryException
Expr
Expr.indexAccessible(org.basex.query.IndexContext)
is implemented for an
expression.
indexEquivalent
in class Expr
ic
- index context
QueryException
- query exceptionpublic boolean duplicates(QueryContext ctx)
Expr
duplicates
in class Expr
ctx
- query context
public void plan(Serializer ser) throws IOException
ExprInfo
plan
in class ExprInfo
ser
- serializer
IOException
- I/O exception
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