Package mondrian.calc.impl
Class AbstractTupleCursor
java.lang.Object
mondrian.calc.impl.AbstractTupleCursor
- All Implemented Interfaces:
TupleCursor
- Direct Known Subclasses:
AbstractTupleIterator
Abstract implementation of
TupleIterator
.
Derived classes need to implement only TupleCursor.forward()
.
- Author:
- jhyde
-
Field Summary
-
Constructor Summary
-
Method Summary
Modifier and TypeMethodDescriptionvoid
currentToArray
(Member[] members, int offset) Writes the member(s) of the next tuple to a given offset in an array.int
getArity()
Returns the number of members in each tuple.member
(int column) void
setContext
(Evaluator evaluator) Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface mondrian.calc.TupleCursor
current, forward
-
Field Details
-
arity
protected final int arity
-
-
Constructor Details
-
AbstractTupleCursor
public AbstractTupleCursor(int arity)
-
-
Method Details
-
setContext
- Specified by:
setContext
in interfaceTupleCursor
-
currentToArray
Description copied from interface:TupleCursor
Writes the member(s) of the next tuple to a given offset in an array.This method saves the overhead of a memory allocation when the resulting tuple will be written immediately to an array. The effect of
currentToArray(members, 0)
is the same as callingcurrent().toArray(members)
.Before calling this method, you must position the iterator at a valid position. Typically you would call hasNext followed by next; or forward.
- Specified by:
currentToArray
in interfaceTupleCursor
- Parameters:
members
- Membersoffset
- Offset in the array to write to
-
getArity
public int getArity()Description copied from interface:TupleCursor
Returns the number of members in each tuple.- Specified by:
getArity
in interfaceTupleCursor
- Returns:
- The number of members in each tuple
-
member
- Specified by:
member
in interfaceTupleCursor
-