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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.dialect;

import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.dialect.hint.IndexQueryHintHandler;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtracter;
import org.hibernate.exception.spi.ViolatedConstraintNameExtracter;
import org.hibernate.internal.util.JdbcExceptionHelper;

/**
 * An SQL dialect for MySQL 5.x specific features.
 *
 * @author Steve Ebersole
 */
public class MySQL5Dialect extends MySQLDialect {
	@Override
	protected void registerVarcharTypes() {
		registerColumnType( Types.VARCHAR, "longtext" );
//		registerColumnType( Types.VARCHAR, 16777215, "mediumtext" );
		registerColumnType( Types.VARCHAR, 65535, "varchar($l)" );
		registerColumnType( Types.LONGVARCHAR, "longtext" );
	}

	@Override
	public boolean supportsColumnCheck() {
		return false;
	}
	
	public ViolatedConstraintNameExtracter getViolatedConstraintNameExtracter() {
		return EXTRACTER;
	}

	protected String getEngineKeyword() {
		return "engine";
	}

	private static final ViolatedConstraintNameExtracter EXTRACTER = new TemplatedViolatedConstraintNameExtracter() {

		@Override
		protected String doExtractConstraintName(SQLException sqle) throws NumberFormatException {
			final int sqlState = Integer.parseInt( JdbcExceptionHelper.extractSqlState( sqle ) );
			switch ( sqlState ) {
			case 23000:
				return extractUsingTemplate( " for key '", "'", sqle.getMessage() );
			default:
				return null;
			}
		}
	};


	@Override
	public String getQueryHintString(String query, String hints) {
		return IndexQueryHintHandler.INSTANCE.addQueryHints( query, hints );
	}

	@Override
	public boolean supportsUnionAll() {
		return true;
	}
}