java/sql/Timestamp.java

/* Time.java -- Wrapper around java.util.Date
   Copyright (C) 1999, 2000, 2003, 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

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permission to link this library with independent modules to produce an
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package java.sql;

import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;

/**
 * This class is a wrapper around java.util.Date to allow the JDBC
 * driver to identify the value as a SQL Timestamp.  Note that this
 * class also adds an additional field for nano-seconds, and so
 * is not completely identical to <code>java.util.Date</code> as
 * the <code>java.sql.Date</code> and <code>java.sql.Time</code>
 * classes are.
 *
 * @author Aaron M. Renn (arenn@urbanophile.com)
 */
public class Timestamp extends java.util.Date
{
  static final long serialVersionUID = 2745179027874758501L;

  /**
   * Used for parsing and formatting this date.
   */
  private static SimpleDateFormat dateFormat =
    new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  private static DecimalFormat decimalFormat = new DecimalFormat("000000000");
  private static StringBuffer sbuf = new StringBuffer(29);

  /**
    * The nanosecond value for this object
    */
  private int nanos;

  /**
   * This method returns a new instance of this class by parsing a
   * date in JDBC format into a Java date.
   *
   * @param str The string to parse.
   * @return The resulting <code>java.sql.Timestamp</code> value.
   */
  public static Timestamp valueOf(String str)
  {
    int nanos = 0;
    int dot = str.indexOf('.');
    if (dot != -1)
      {
        if (str.lastIndexOf('.') != dot)
          throw new IllegalArgumentException(str);

        int len = str.length() - dot - 1;
        if (len < 1 || len > 9)
          throw new IllegalArgumentException(str);

        nanos = Integer.parseInt(str.substring(dot + 1));
        for (int i = len; i < 9; i++)
          nanos *= 10;

        str = str.substring(0, dot);

      }

    try
      {
        java.util.Date d;
        synchronized (dateFormat)
          {
            d = (java.util.Date) dateFormat.parseObject(str);
          }

        if (d == null)
          throw new IllegalArgumentException(str);

        Timestamp ts = new Timestamp(d.getTime() + nanos / 1000000);
        ts.nanos = nanos;
        return ts;
      }
    catch (ParseException e)
      {
        throw new IllegalArgumentException(str);
      }
  }

  /**
   * This method initializes a new instance of this class with the
   * specified year, month, and day.
   *
   * @param year The year for this Timestamp (year - 1900)
   * @param month The month for this Timestamp (0-11)
   * @param day The day for this Timestamp (1-31)
   * @param hour The hour for this Timestamp (0-23)
   * @param minute The minute for this Timestamp (0-59)
   * @param second The second for this Timestamp (0-59)
   * @param nanos The nanosecond value for this Timestamp (0 to 999,999,9999)
   * @deprecated
   */
  public Timestamp(int year, int month, int day, int hour, int minute,
    int second, int nanos)
  {
    super(year, month, day, hour, minute, second);
    this.nanos = nanos;
  }

  /**
   * This method initializes a new instance of this class with the
   * specified time value representing the number of milliseconds since
   * Jan 1, 1970 at 12:00 midnight GMT.
   *
   * @param date The time value to intialize this <code>Time</code> to.
   */
  public Timestamp(long date)
  {
    super(date - (date % 1000));
    nanos = (int) (date % 1000) * 1000000;
  }

  /**
   * Return the value of this Timestamp as the number of milliseconds
   * since Jan 1, 1970 at 12:00 midnight GMT.
   */
  public long getTime()
  {
    return super.getTime() + (nanos / 1000000);
  }

  /**
   * This method returns this date in JDBC format.
   *
   * @return This date as a string.
   */
  public String toString()
  {
    synchronized (dateFormat)
      {
        sbuf.setLength(0);
        dateFormat.format(this, sbuf, null);
        sbuf.append('.');
        decimalFormat.format(nanos, sbuf, null);
        int end = sbuf.length() - 1;
        while (end > 20 && sbuf.charAt(end) == '0')
          end--;
        return sbuf.substring(0, end + 1);
      }
  }

  /**
    * This method returns the nanosecond value for this object.
    * @return The nanosecond value for this object.
    */
  public int getNanos()
  {
    return nanos;
  }

  /**
   * This method sets the nanosecond value for this object.
   *
   * @param nanos The nanosecond value for this object.
   */
  public void setNanos(int nanos)
  {
    this.nanos = nanos;
  }

  /**
   * This methods tests whether this object is earlier than the specified
   * object.
   *
   * @param ts The other <code>Timestamp</code> to test against.
   * @return <code>true</code> if this object is earlier than the other object,
   *         <code>false</code> otherwise.
   */
  public boolean before(Timestamp ts)
  {
    long time1 = getTime();
    long time2 = ts.getTime();
    if (time1 < time2 || (time1 == time2 && getNanos() < ts.getNanos()))
      return true;
    return false;
  }

  /**
   * This methods tests whether this object is later than the specified
   * object.
   *
   * @param ts The other <code>Timestamp</code> to test against.
   *
   * @return <code>true</code> if this object is later than the other object,
   * <code>false</code> otherwise.
   */
  public boolean after(Timestamp ts)
  {
    long time1 = getTime();
    long time2 = ts.getTime();
    if (time1 > time2 || (time1 == time2 && getNanos() > ts.getNanos()))
      return true;
    return false;
  }

  /**
   * This method these the specified <code>Object</code> for equality
   * against this object.  This will be true if an only if the specified
   * object is an instance of <code>Timestamp</code> and has the same
   * time value fields.
   *
   * @param obj The object to test against for equality.
   *
   * @return <code>true</code> if the specified object is equal to this
   * object, <code>false</code> otherwise.
   */
  public boolean equals(Object obj)
  {
    if (!(obj instanceof Timestamp))
      return false;

    return equals((Timestamp) obj);
  }

  /**
   * This method tests the specified timestamp for equality against this
   * object.  This will be true if and only if the specified object is
   * not <code>null</code> and contains all the same time value fields
   * as this object.
   *
   * @param ts The <code>Timestamp</code> to test against for equality.
   *
   * @return <code>true</code> if the specified object is equal to this
   * object, <code>false</code> otherwise.
   */
  public boolean equals(Timestamp ts)
  {
    if (ts == null)
      return false;

    if (ts.getTime() != getTime())
      return false;

    if (ts.getNanos() != getNanos())
      return false;

    return true;
  }

  /**
   * Compares this <code>Timestamp</code> to another one.
   *
   * @param ts The other Timestamp.
   * @return <code>0</code>, if both <code>Timestamp</code>'s represent exactly
   *         the same date, a negative value if this <code>Timestamp</code> is
   *         before the specified <code>Timestamp</code> and a positive value
   *         otherwise.
   * @since 1.2
   */
  public int compareTo(Timestamp ts)
  {
    int s = super.compareTo((java.util.Date) ts);
    if (s != 0)
      return s;
    // If Date components were equal, then we check the nanoseconds.
    return nanos - ts.nanos;
  }

  /**
   * Compares this <code>Timestamp</code> to another one. This behaves like
   * <code>compareTo(Timestamp)</code>, but it may throw a
   * <code>ClassCastException</code>, if the specified object is not of type
   * <code>Timestamp</code>.
   *
   * @param obj The object to compare with.
   * @return <code>0</code>, if both <code>Timestamp</code>'s represent exactly
   *         the same date, a negative value if this <code>Timestamp</code> is
   *         before the specified <code>Timestamp</code> and a positive value
   *         otherwise.
   * @exception ClassCastException if obj is not of type Timestamp.
   * @see #compareTo(Timestamp)
   * @since 1.2
   */
  public int compareTo(java.util.Date obj)
  {
    return compareTo((Timestamp) obj);
  }
}