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java.lang.Objectorg.basex.query.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.Group
public final class Group
Implementation of the group by clause.
Nested Class Summary |
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Nested classes/interfaces inherited from class org.basex.query.expr.Expr |
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Expr.Use |
Constructor Summary | |
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Group(Grp[] g)
Constructor. |
Method Summary | |
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void |
add(QueryContext ctx)
Adds the items to be grouped. |
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. |
Group |
remove(Var v)
Removes the specified variable in a sub expression. |
String |
toString()
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boolean |
uses(Expr.Use use,
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, duplicates, e, ebv, i, indexAccessible, indexEquivalent, removable, returned, sameAs, size, test, v |
Methods inherited from class org.basex.query.ExprInfo |
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color, 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 Group(Grp[] g)
g
- groupsMethod Detail |
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public Expr comp(QueryContext ctx) throws QueryException
Expr
comp
in class Expr
ctx
- query context
QueryException
- query exceptionpublic Iter iter(QueryContext ctx)
Expr
Expr.atomic(org.basex.query.QueryContext)
must be implemented.
iter
in class Expr
ctx
- query context
public void add(QueryContext ctx) throws QueryException
ctx
- query context
QueryException
- query exceptionpublic boolean uses(Expr.Use use, QueryContext ctx)
Expr
true
is returned by default and thus assumed as "worst-case".
uses
in class Expr
use
- use type to be checkedctx
- query context
public Group remove(Var v)
Expr
remove
in class Expr
v
- variable to be removed
public void plan(Serializer ser) throws IOException
ExprInfo
plan
in class ExprInfo
ser
- serializer
IOException
- I/O exceptionpublic String toString()
toString
in class ExprInfo
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