Read existing cubes with Java OLAP API

Question

Hi,
i am new to the Oracle OLAP API and i have a question for which a do not find the answer in the documentation..
I need to access all existing cubes in a database, get the names, the corresponding dimensions etc.
There is no problem in reading the dimensions their hierarchies, the measures an so on. But i found no method or class to read out the information about cubes (names, dimension).
The only thing i found in the documentation to get a cube was over a MtmMeasureMap, but when i call this method i get the exception: Not supported by server version ORAOLAP10.2.0.1.0
Any hints?
Thanks

Answer 1

In current releases, the OLAP API is primarily a query API. Queries can include measures from multiple cubes, so there is no real purpose for a cube object. Therefore there is no Cube class in the Mdm logical metadata package.
Cubes are useful in OLAP mappings, and there is an MtmCube class in the Mtm mapping metadata package. It is possible to navigate between Mdm and Mtm objects. The code that follows prints out the names of all of the cubes and the names of their dimensions.
I don't understand the "Not supported by server version" error that you got. This sample code works for me in 10.1.0.4, and I expect it would work in 10.2, too.
Geof
MdmMetadataProvider mdp; // given
Hashtable cubes = new Hashtable();
MdmSchema rootSchema = mdp.getRootSchema();
Iterator subSchemas = rootSchema.getSubSchemas().iterator();
collectCubes(rootSchema, cubes);
while (subSchemas.hasNext())
collectCubes((MdmSchema) subSchemas.next(), cubes);
// enumerate cubes
Enumeration cubeList = cubes.keys();
while (cubeList.hasMoreElements())
MtmCube cube = (MtmCube) cubes.get(cubeList.nextElement());
System.out.print(cube.getName() + ": ");
Iterator dimensionMaps = cube.getDimensionMaps().iterator();
boolean first = true;
while (dimensionMaps.hasNext())
MtmDimensionMap dimensionMap = (MtmDimensionMap) dimensionMaps.next();
MdmDimension dimension = (MdmDimension) dimensionMap.getMdmSource();
if (first)
first = false;
else
System.out.print(", ");
System.out.print(dimension.getName());
System.out.println();
void collectCubes(MdmSchema schema, Hashtable cubes)
Iterator measures = schema.getMeasures().iterator();
while (measures.hasNext())
MdmMeasure measure = (MdmMeasure) measures.next();
MtmMeasureMap measureMap = measure.getMeasureMap();
MtmCube cube = measureMap.getCube();
// See if we have already visited this cube for another measure
String id = cube.getID();
if (null == cubes.get(id))
cubes.put(id, cube);
}