Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetHandle.java
{
		return getIntProperty( ROW_FETCH_LIMIT_PROP );
	}
	/**
	 * Adds the filter condition.
	 * 
	 * @param fc
	 *            the filter condition structure
	 * @throws SemanticException
	 *             if the expression of filter condition is empty or null
	 */
	public void addFilter( FilterCondition fc ) throws SemanticException
	{
		PropertyHandle propHandle = getPropertyHandle( FILTER_PROP );
		propHandle.addItem( fc );
	}
	/**
	 * Removes the filter condition.
	 * 
	 * @param fc
	 *            the filter condition structure
	 * @throws SemanticException
	 *             if the given condition doesn't exist in the filters
	 */
	public void removeFilter( FilterCondition fc ) throws SemanticException
	{
		PropertyHandle propHandle = getPropertyHandle( FILTER_PROP );
		propHandle.removeItem( fc );
	}
}