src/org/tiefaces/components/websheet/utility/ConfigurationUtility.java
@SuppressWarnings("rawtypes")
	public static Collection transformToCollectionObject(
			final ExpressionEngine engine, final String collectionName,
			final Map<String, Object> context) {
		Object collectionObject = engine.evaluate(collectionName, context);
		if (!(collectionObject instanceof Collection)) {
			throw new EvaluationException(
					collectionName + " expression is not a collection");
		}
		return (Collection) collectionObject;
	}
@SuppressWarnings("rawtypes")
	public static Collection transformToCollectionObject(
			final ExpressionEngine engine, final String collectionName,
			final Map<String, Object> context) {
		Object collectionObject = engine.evaluate(collectionName, context);
		if (!(collectionObject instanceof Collection)) {
			throw new EvaluationException(
					collectionName + " expression is not a collection");
		}
		return (Collection) collectionObject;
	}
Transform to collection object.

@param engine
the engine
@param collectionName
the collection name
@param context
the context
@return the collection