/**
 * Title:        <p>
 * Description:  <p>
 * Copyright:    Copyright (c) Troy Thompson, Bob Byron<p>
 * Company:      JavaUnderground<p>
 * @author       Troy Thompson, Bob Byron
 * @version 1.1
 */
package com.javaunderground.jdbc;

import java.util.Calendar;
import java.math.BigDecimal;
import java.io.*;
import java.sql.*;

/**
 * OracleSqlFormatter formats Oracle specific types. These include
 * Calendar, Date, Time, and TimeStamps. Generic types are handled
 * by SqlFormatter.
 */
public class OracleSqlFormatter extends SqlFormatter{

  /**
   * Format of Oracle date: 'YYYY-MM-DD HH24:MI:SS.#'
   */
  final String ymd24="'YYYY-MM-DD HH24:MI:SS.#'";

  /**
   * Formats Calendar object into Oracle TO_DATE String.
   * @param cal Calendar to be formatted
   * @return formatted TO_DATE function
   */
  private String format(Calendar cal){
    return "TO_DATE('" + new java.sql.Timestamp(cal.getTime().getTime()) + "',"+ymd24+")";
  }

  /**
   * Formats Date object into Oracle TO_DATE String.
   * @param date Date to be formatted
   * @return formatted TO_DATE function
   */
  private String format(java.sql.Date date){
    return "TO_DATE('" + new java.sql.Timestamp(date.getTime()) + "',"+ymd24+")";
  }

  /**
   * Formats Time object into Oracle TO_DATE String.
   * @param time Time to be formatted
   * @return formatted TO_DATE function
   */
  private String format(java.sql.Time time){
    Calendar cal = Calendar.getInstance();
    cal.setTime(new java.util.Date(time.getTime()));
    return "TO_DATE('" + cal.get(Calendar.HOUR_OF_DAY) + ":" +
      cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND) + "." +
      cal.get(Calendar.MILLISECOND) + "','HH24:MI:SS.#')";
  }

  /**
   * Formats Timestamp object into Oracle TO_DATE String.
   * @param timestamp Timestamp to be formatted
   * @return formatted TO_DATE function
   */
  private String format(java.sql.Timestamp timestamp){
    return "TO_DATE('" + timestamp.toString() + "',"+ymd24+")";
  }


  /**
   * Formats object to an Oracle specific formatted function.
   * @param o Object to be formatted.
   * @return formatted Oracle function or "NULL" if o is null.
   * @exception SqlException
   */
  public String format(Object o) throws SQLException{
    if (o == null)               return "NULL";
    if (o instanceof Calendar)   return format((Calendar)o);
    if (o instanceof Date)       return format((Date)o);
    if (o instanceof Time)       return format((Time)o);
    if (o instanceof Timestamp)  return format((Timestamp)o);
    //if object not in one of our overridden methods, send to super class
    return super.format(o);

  } }