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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.Preds
org.basex.query.expr.Pred
public class Pred
Predicate 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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Fields inherited from class org.basex.query.expr.Preds |
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pred |
Constructor Summary | |
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Pred(Expr r,
Expr... p)
Constructor. |
Method Summary | |
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Expr |
comp(QueryContext ctx)
Optimizes and compiles the expression. |
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. |
String |
toString()
|
boolean |
uses(Expr.Use u,
QueryContext ctx)
Indicates if an expression uses the specified type. |
Methods inherited from class org.basex.query.expr.Preds |
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color |
Methods inherited from class org.basex.query.expr.Expr |
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addText, atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, returned, sameAs, size, 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 |
Constructor Detail |
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public Pred(Expr r, Expr... p)
r
- expressionp
- predicatesMethod Detail |
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public final Expr comp(QueryContext ctx) throws QueryException
Expr
comp
in class Preds
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 boolean uses(Expr.Use u, QueryContext ctx)
Expr
true
is returned by default and thus assumed as "worst-case".
uses
in class Preds
u
- use type to be checkedctx
- query context
public final boolean removable(Var v, QueryContext ctx)
Expr
removable
in class Preds
v
- variable to be removedctx
- query context
public final Expr remove(Var v)
Expr
remove
in class Preds
v
- variable to be removed
public final void plan(Serializer ser) throws IOException
ExprInfo
plan
in class Preds
ser
- serializer
IOException
- I/O exceptionpublic final String toString()
toString
in class Preds
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