/*
    * Copyright (C) 2003-2012 David E. Berry
    *
    * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
   *
   * A copy of the GNU Lesser General Public License may also be found at
   * http://www.gnu.org/licenses/lgpl.txt
   */
  package org.synchronoss.cpo.jdbc;
  
  import org.synchronoss.cpo.*;
  
  import javax.sql.DataSource;
  import java.util.*;
  
  /**
   *
   * @author dberry
   */
  public abstract class AbstractDataSourceInfo implements DataSourceInfo {
    private DataSource dataSource = null;
    private String dataSourceName = null;
    // Make sure DataSource creation is thread safe.
    private final Object LOCK = new Object();
    
    // common password strings
    private final String PASSWORD = "password";
    private final String PASSWD = "passwd";
    private final String PWD = "pwd";
  
    public AbstractDataSourceInfo(String dataSourceName) {
      this.dataSourceName=dataSourceName;
    }
    
    public AbstractDataSourceInfo(String className, SortedMap<String, String> properties) {
      this.dataSourceName=BuildDataSourceName(className, properties);
    }
  
    public AbstractDataSourceInfo(String className, Properties properties) {
      this.dataSourceName=BuildDataSourceName(className, properties);
    }
  
    protected abstract DataSource createDataSource() throws CpoException ;
    
    @Override
    public String getDataSourceName() {
      return dataSourceName;
    }
  
    @Override
    public DataSource getDataSource() throws CpoException {
      if (dataSource == null) {
        synchronized (LOCK) {
          try {
            dataSource = createDataSource();
          } catch (Exception e) {
            throw new CpoException("Error instantiating DataSource", e);
          }
        }
      }
  
      return dataSource;
    }
    
    private String BuildDataSourceName(String s, Properties properties) {
      // Use a tree map so that the properties are sorted. This way if we have
      // the same datasource with the same properties but in different order,
      // we will generate the same key.
      SortedMap<String, String> map = new TreeMap<String, String>();
      for (Object key : properties.keySet()){
        map.put((String)key, properties.getProperty((String)key));
      }
      return BuildDataSourceName(s, map);
    }
    
    private String BuildDataSourceName(String s, SortedMap<String, String> map) {
      StringBuilder dsName = new StringBuilder(s);
  
      for (Object obj : map.keySet()) {
        String key = (String)obj;
        // Don't store the password in the datasource generated name.
        if (!PASSWORD.equalsIgnoreCase(key) && !PASSWD.equalsIgnoreCase(key) && !PWD.equalsIgnoreCase(key) ) {
          dsName.append(key);
          dsName.append("=");
          dsName.append(map.get(key));
        }
      }
 
     return dsName.toString();
   }
 
 }