Bug 416703 Mongodb : Display correctly the Number data type
data/org.eclipse.birt.data.oda.mongodb/src/org/eclipse/birt/data/oda/mongodb/internal/impl/MDbMetaData.java
{
        if( connectedDB == null )
            throw new IllegalArgumentException( "null" ); 
        m_connectedDB = connectedDB;
    }
    private MDbMetaData() {}
    
    /**
     * Returns the name of the connected database.
     */
    public String getDatabaseName()
    {
        return m_connectedDB.getName();
    }
    /**
     * Returns the sorted list of collection names found in the 
     * connected database of this instance.
     * The returned list excludes system collections, by default.
     */
    public List<String> getCollectionsList()
    {
        return getCollectionsList( true );
    }
    
    /**
     * Returns the sorted list of collection names found in the 
     * connected database of this instance.
     * @param excludeSystemCollections  true indicates to exclude system collections
     *          from the returned list; false to include.
     */