DatabaseDialectAdapter.java

/**
 *  OpenKM, Open Document Management System (http://www.openkm.com)
 *  Copyright (c) 2006-2011  Paco Avila & Josep Llort
 *
 *  No bytes were intentionally harmed during the development of this application.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package com.openkm.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.io.IOUtils;
import org.hibernate.dialect.Oracle10gDialect;
import org.hibernate.dialect.SQLServerDialect;

public class DatabaseDialectAdapter {
	
	/**
	 * Adapt "default.sql" to every supported database
	 */
	public static String dialectAdapter(InputStream is, String dialect) {
		StringBuilder sb = new StringBuilder();
		BufferedReader br = null;
		String line;
		
		try {
			br = new BufferedReader(new InputStreamReader(is));
			
			if (Oracle10gDialect.class.getCanonicalName().equals(dialect)) {
				while ((line = br.readLine()) != null) {
					sb.append(oracleAdapter(line)).append("\n");
				}
			} else if (SQLServerDialect.class.getCanonicalName().equals(dialect)) {
				while ((line = br.readLine()) != null) {
					sb.append(sqlServerAdapter(line)).append("\n");
				}
			} else {
				while ((line = br.readLine()) != null) {
					sb.append(line).append("\n");
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			IOUtils.closeQuietly(br);
			IOUtils.closeQuietly(is);
		}
		
		return sb.toString().trim();
	}
	
	/**
	 * Oracle special stuff
	 */
	private static String oracleAdapter(String line) {
		if (line.startsWith("INSERT INTO OKM_FORUM")) {
			return line.replaceAll("NOW\\(\\)", "SYSDATE");
		} else {
			return line;
		}
	}
	
	/**
	 * SQL Server special stuff
	 */
	private static String sqlServerAdapter(String line) {
		StringBuilder sb = new StringBuilder();
		
		if (line.startsWith("INSERT INTO OKM_PROFILE")) {
			sb.append("SET IDENTITY_INSERT OKM_PROFILE ON;").append("\n");
			sb.append(line).append("\n");
			sb.append("SET IDENTITY_INSERT OKM_PROFILE OFF;");
			return sb.toString();
		} else if (line.startsWith("INSERT INTO OKM_MIME_TYPE")) {
			sb.append("SET IDENTITY_INSERT OKM_MIME_TYPE ON;").append("\n");
			sb.append(line).append("\n");
			sb.append("SET IDENTITY_INSERT OKM_MIME_TYPE OFF;");
			return sb.toString();
		} else if (line.startsWith("INSERT INTO OKM_FORUM")) {
			sb.append("SET IDENTITY_INSERT OKM_FORUM ON;").append("\n");
			sb.append(line.replaceAll("NOW\\(\\)", "GETDATE()")).append("\n");
			sb.append("SET IDENTITY_INSERT OKM_FORUM OFF;");
			return sb.toString();
		} else {
			return line;
		}
	}
}