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• 0.2.3
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• QueryResult.java

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se.l4.silo.query.QueryResult Maven / Gradle / Ivy

package se.l4.silo.query;

/**
 * Individual result of a query operation. Used by {@link QueryType} to
 * translate results into a suitable representation.
 *
 * @author Andreas Holstenson
 *
 */
public interface QueryResult
{
	/**
	 * Get the main data of the result.
	 *
	 * @return
	 */
	T getData();

	/**
	 * Get some metadata from this query result.
	 *
	 * @param key
	 * @return
	 */
	 R getMetadata(String key);

	/**
	 * Get some metadata from this query result.
	 *
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	@SuppressWarnings("unchecked")
	default  R getMetadata(String key, R defaultValue)
	{
		Object v = getMetadata(key);
		return v == null ? defaultValue : (R) v;
	}
}