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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.dba.derby;

import org.apache.cayenne.dba.JdbcAdapter;
import org.apache.cayenne.dba.oracle.OraclePkGenerator;
import org.apache.cayenne.map.DbEntity;

/**
 * PK generator for Derby that uses sequences.
 * 
 * @since 4.0 (old one used AUTO_PK_SUPPORT table)
 */
public class DerbyPkGenerator extends OraclePkGenerator {

	DerbyPkGenerator(JdbcAdapter adapter) {
		super(adapter);
	}

	@Override
	protected String sequenceName(DbEntity entity) {
		return super.sequenceName(entity).toUpperCase();
	}

	@Override
	protected String selectNextValQuery(String pkGeneratingSequenceName) {
		return "VALUES (NEXT VALUE FOR " + pkGeneratingSequenceName + ")";
	}

	@Override
	protected String selectAllSequencesQuery() {
		return "SELECT SEQUENCENAME FROM SYS.SYSSEQUENCES";
	}

	@Override
	protected String dropSequenceString(DbEntity entity) {
		return "DROP SEQUENCE " + sequenceName(entity) + " RESTRICT";
	}

	@Override
	protected String createSequenceString(DbEntity entity) {
		return "CREATE SEQUENCE " + sequenceName(entity) + " AS BIGINT START WITH " + pkStartValue +
				" INCREMENT BY " + getPkCacheSize() + " NO MAXVALUE NO CYCLE";
	}
}