Bug 180189 Support in memory data set cache.
Currently, Design-Time Data Cache is stored on disks. By performance tests using ramdisk, we found that caching in physical memory can improve the performance of RunAndRender by 30%.
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/DataSetCacheTest.java
}
				for ( int j = groupCount; j < beArray.length; j++ )
				{
					String value = ri.getValue( beArray[j] ).toString( );
					rowData += formatStr( value, expectedLen );
				}
			}
			sBuffer.append( rowData );
			sBuffer.append( "\n" );
		}
		return new String( sBuffer );
	}
	/**
	 * Format string to specified length, if the length of input string is
	 * larger than expected length, then input string will be directly return
	 * without any format.
	 * 
	 * @param str
	 *            needs to be formatted string
	 * @param length
	 *            expected length
	 * @return formatted string
	 */
	private static String formatStr( String inputStr, int length )
	{
		if ( inputStr == null )
			return null;
		int inputLen = inputStr.length( );
		if ( inputLen >= length )
			return inputStr;