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/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2002-2009, DbUnit.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
package org.dbunit.ext.netezza;

import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.dbunit.database.IMetadataHandler;
import org.dbunit.util.SQLHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Special metadata handler for Netezza.
 * 
 * @author Ameet (amit3011 AT users.sourceforge.net)
 * @author Last changed by: $Author$
 * @version $Revision$ $Date$
 * @since 2.4.6
 */
public class NetezzaMetadataHandler implements IMetadataHandler
{

	/**
	 * Logger for this class
	 */
	private static final Logger logger = LoggerFactory.getLogger(NetezzaMetadataHandler.class);

	public NetezzaMetadataHandler()
	{
		logger.debug("Created object of metadatahandler");
	}

	public ResultSet getColumns(DatabaseMetaData databaseMetaData, String schemaName, String tableName) throws SQLException
	{
		// Note that Netezza uses the catalogName instead of the schemaName, so
		// pass in the given schema name as catalog name (first argument).
		ResultSet resultSet = databaseMetaData.getColumns(schemaName, null, tableName, "%");
		return resultSet;
	}

	public boolean matches(ResultSet resultSet, String schema, String table, boolean caseSensitive) throws SQLException
	{
		return matches(resultSet, null, schema, table, null, caseSensitive);
	}

	public boolean matches(ResultSet columnsResultSet, String catalog, String schema, String table, String column, boolean caseSensitive) throws SQLException
	{
		String catalogName = columnsResultSet.getString(1);
		String schemaName = columnsResultSet.getString(2);
		String tableName = columnsResultSet.getString(3);
		String columnName = columnsResultSet.getString(4);

		logger.debug("inputCatalog="+catalog+" inputSchema="+schema+" inputTable="+table+" inputColumn="+column);
		logger.debug("catalogName=" + catalogName + " schemaName=" + schemaName+"tableName=" + tableName+" columnName=" + columnName);
		
		// Netezza provides only a catalog but no schema
		//if (schema != null && schemaName == null && catalog == null && catalogName != null)
		if(catalog==null && catalogName!=null && schemaName !=null)
		{
			logger.debug("Netezza uses catalogs");
			schema = schemaName;
			catalog = catalogName;
		}

		boolean areEqual = areEqualIgnoreNull(catalog, catalogName, caseSensitive) && areEqualIgnoreNull(schema, schemaName, caseSensitive) && areEqualIgnoreNull(table, tableName, caseSensitive) && areEqualIgnoreNull(column, columnName, caseSensitive);
		return areEqual;
	}

	private boolean areEqualIgnoreNull(String value1, String value2, boolean caseSensitive)
	{
		return SQLHelper.areEqualIgnoreNull(value1, value2, caseSensitive);
	}

	public String getSchema(ResultSet resultSet) throws SQLException
	{
		String catalogName = resultSet.getString(1);
		String schemaName = resultSet.getString(2);

		// Fix schema/catalog for netezza. Normally the schema is not set but only the catalog is set
		if (schemaName == null && catalogName != null)
		{
			logger.debug("Using catalogName '" + catalogName + "' as schema since the schema is null but the catalog is set (probably in Netezza environment).");
			schemaName = catalogName;
		}
		return schemaName;
	}

	public boolean tableExists(DatabaseMetaData metaData, String schema, String tableName) throws SQLException
	{
		ResultSet tableRs = metaData.getTables(schema, null, tableName, null);
		try
		{
			return tableRs.next();
		}
		finally
		{
			SQLHelper.close(tableRs);
		}
	}

	public ResultSet getTables(DatabaseMetaData metaData, String schemaName, String[] tableType) throws SQLException
	{
		if (logger.isTraceEnabled())
			logger.trace("tableExists(metaData={}, schemaName={}, tableType={}) - start", new Object[] { metaData, schemaName, tableType });

		return metaData.getTables(schemaName, null, "%", tableType);
	}

	public ResultSet getPrimaryKeys(DatabaseMetaData metaData, String schemaName, String tableName) throws SQLException
	{
		if (logger.isTraceEnabled())
			logger.trace("getPrimaryKeys(metaData={}, schemaName={}, tableName={}) - start", new Object[] { metaData, schemaName, tableName });
		ResultSet resultSet = metaData.getPrimaryKeys(schemaName, null, tableName);
		return resultSet;
	}
}