EDIT

package eu.etaxonomy.cdm.persistence.dao.common;

import java.util.List;

import eu.etaxonomy.cdm.model.common.CdmBase;

public interface ISearchableDao<T extends CdmBase> {

	/**

	 * Returns a count of T instances where the default field matches the String queryString (as interpreted by the Lucene QueryParser)

	 * 

	 * @param queryString

	 * @return a count of the matching entities

	 * @see <a href="http://lucene.apache.org/java/2_4_0/queryparsersyntax.html">Apache Lucene - Query Parser Syntax</a>

	 */

	public int count(String queryString);

	/**

	 * Returns a List of T instances where the default field matches the String queryString (as interpreted by the Lucene QueryParser)

	 * 

	 * @param queryString

	 * @param pageSize The maximum number of entities returned (can be null for all matching entities)

	 * @param pageNumber The offset (in pageSize chunks) from the start of the result set (0 - based)

	 * @return a List T instances

	 * @see <a href="http://lucene.apache.org/java/2_4_0/queryparsersyntax.html">Apache Lucene - Query Parser Syntax</a>

	 */

	public List<T> search(String queryString, Integer pageSize, Integer pageNumber);

	/**

	 * Suggest a query that will return hits based upon an existing lucene query string (that is presumably misspelt and returns no hits)

	 * Used to implement "did you mean?"-type functionality using the lucene spellchecker.

	 * 

	 * @param string Query string to check

	 * @return a suggested query string that will return hits or null if no such alternative spelling can be found.

	 */

	public String suggestQuery(String string);

	/**

	 * Removes all TaxonBase entities from the index

	 */

	public void purgeIndex();

	/**

	 * Index all T entities currently in the database (useful in concert with purgeIndex() to (re-)create

	 * indexes or in the  case of corrupt indexes / mismatch between 

	 * the database and the free-text indices) 

	 */

	public void rebuildIndex();

	/**

	 * Calls optimize on the relevant index (useful periodically to increase response times on the free-text search)

	 */

	public void optimizeIndex();

}