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java.lang.Objectmondrian.rolap.agg.SparseSegmentDataset
class SparseSegmentDataset
A SparseSegmentDataset
is a means of storing segment values
which is suitable when few of the combinations of keys have a value present.
The storage requirements are as follows. Key is 1 word for each dimension. Hashtable entry is 3 words. Value is 1 word. Total space is (4 + d) * v. (May also need hash table to ensure that values are only stored once.)
NOTE: This class is not synchronized.
Constructor Summary | |
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SparseSegmentDataset(Segment segment)
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Method Summary | |
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Object |
get(CellKey pos)
Returns the value at a given coordinate. |
double |
getBytes()
Returns the number of bytes occupied by this dataset. |
Iterator<Map.Entry<CellKey,Object>> |
iterator()
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void |
put(CellKey key,
Object value)
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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SparseSegmentDataset(Segment segment)
Method Detail |
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public Object get(CellKey pos)
SegmentDataset
get
in interface SegmentDataset
pos
- Coordinate position
public void put(CellKey key, Object value)
put
in interface SegmentDataset
public Iterator<Map.Entry<CellKey,Object>> iterator()
iterator
in interface Iterable<Map.Entry<CellKey,Object>>
public double getBytes()
SegmentDataset
getBytes
in interface SegmentDataset
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