320 lines
9.4 KiB
Java
320 lines
9.4 KiB
Java
/* Time.java -- Wrapper around java.util.Date
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Copyright (C) 1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.sql;
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import java.text.DecimalFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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/**
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* This class is a wrapper around java.util.Date to allow the JDBC
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* driver to identify the value as a SQL Timestamp. Note that this
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* class also adds an additional field for nano-seconds, and so
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* is not completely identical to <code>java.util.Date</code> as
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* the <code>java.sql.Date</code> and <code>java.sql.Time</code>
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* classes are.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class Timestamp extends java.util.Date
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{
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static final long serialVersionUID = 2745179027874758501L;
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/**
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* Used for parsing and formatting this date.
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*/
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private static SimpleDateFormat dateFormat =
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new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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private static DecimalFormat decimalFormat = new DecimalFormat("000000000");
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private static StringBuffer sbuf = new StringBuffer(29);
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/**
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* The nanosecond value for this object
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*/
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private int nanos;
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/**
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* This method returns a new instance of this class by parsing a
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* date in JDBC format into a Java date.
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*
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* @param str The string to parse.
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* @return The resulting <code>java.sql.Timestamp</code> value.
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*/
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public static Timestamp valueOf(String str)
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{
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int nanos = 0;
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int dot = str.indexOf('.');
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if (dot != -1)
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{
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if (str.lastIndexOf('.') != dot)
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throw new IllegalArgumentException(str);
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int len = str.length() - dot - 1;
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if (len < 1 || len > 9)
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throw new IllegalArgumentException(str);
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nanos = Integer.parseInt(str.substring(dot + 1));
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for (int i = len; i < 9; i++)
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nanos *= 10;
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str = str.substring(0, dot);
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}
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try
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{
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java.util.Date d;
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synchronized (dateFormat)
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{
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d = (java.util.Date) dateFormat.parseObject(str);
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}
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if (d == null)
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throw new IllegalArgumentException(str);
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Timestamp ts = new Timestamp(d.getTime() + nanos / 1000000);
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ts.nanos = nanos;
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return ts;
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}
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catch (ParseException e)
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{
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throw new IllegalArgumentException(str);
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}
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}
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/**
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* This method initializes a new instance of this class with the
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* specified year, month, and day.
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*
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* @param year The year for this Timestamp (year - 1900)
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* @param month The month for this Timestamp (0-11)
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* @param day The day for this Timestamp (1-31)
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* @param hour The hour for this Timestamp (0-23)
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* @param minute The minute for this Timestamp (0-59)
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* @param second The second for this Timestamp (0-59)
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* @param nanos The nanosecond value for this Timestamp (0 to 999,999,9999)
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* @deprecated
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*/
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public Timestamp(int year, int month, int day, int hour, int minute,
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int second, int nanos)
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{
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super(year, month, day, hour, minute, second);
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this.nanos = nanos;
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}
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/**
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* This method initializes a new instance of this class with the
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* specified time value representing the number of milliseconds since
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* Jan 1, 1970 at 12:00 midnight GMT.
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*
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* @param date The time value to intialize this <code>Time</code> to.
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*/
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public Timestamp(long date)
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{
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super(date - (date % 1000));
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nanos = (int) (date % 1000) * 1000000;
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}
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/**
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* Return the value of this Timestamp as the number of milliseconds
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* since Jan 1, 1970 at 12:00 midnight GMT.
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*/
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public long getTime()
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{
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return super.getTime() + (nanos / 1000000);
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}
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/**
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* This method returns this date in JDBC format.
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*
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* @return This date as a string.
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*/
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public String toString()
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{
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synchronized (dateFormat)
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{
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sbuf.setLength(0);
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dateFormat.format(this, sbuf, null);
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sbuf.append('.');
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decimalFormat.format(nanos, sbuf, null);
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int end = sbuf.length() - 1;
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while (end > 20 && sbuf.charAt(end) == '0')
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end--;
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return sbuf.substring(0, end + 1);
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}
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}
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/**
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* This method returns the nanosecond value for this object.
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* @return The nanosecond value for this object.
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*/
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public int getNanos()
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{
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return nanos;
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}
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/**
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* This method sets the nanosecond value for this object.
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*
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* @param nanos The nanosecond value for this object.
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*/
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public void setNanos(int nanos)
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{
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this.nanos = nanos;
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}
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/**
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* This methods tests whether this object is earlier than the specified
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* object.
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*
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* @param ts The other <code>Timestamp</code> to test against.
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* @return <code>true</code> if this object is earlier than the other object,
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* <code>false</code> otherwise.
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*/
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public boolean before(Timestamp ts)
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{
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long time1 = getTime();
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long time2 = ts.getTime();
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if (time1 < time2 || (time1 == time2 && getNanos() < ts.getNanos()))
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return true;
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return false;
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}
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/**
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* This methods tests whether this object is later than the specified
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* object.
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*
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* @param ts The other <code>Timestamp</code> to test against.
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*
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* @return <code>true</code> if this object is later than the other object,
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* <code>false</code> otherwise.
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*/
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public boolean after(Timestamp ts)
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{
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long time1 = getTime();
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long time2 = ts.getTime();
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if (time1 > time2 || (time1 == time2 && getNanos() > ts.getNanos()))
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return true;
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return false;
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}
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/**
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* This method these the specified <code>Object</code> for equality
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* against this object. This will be true if an only if the specified
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* object is an instance of <code>Timestamp</code> and has the same
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* time value fields.
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*
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* @param obj The object to test against for equality.
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*
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* @return <code>true</code> if the specified object is equal to this
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* object, <code>false</code> otherwise.
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*/
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public boolean equals(Object obj)
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{
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if (!(obj instanceof Timestamp))
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return false;
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return equals((Timestamp) obj);
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}
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/**
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* This method tests the specified timestamp for equality against this
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* object. This will be true if and only if the specified object is
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* not <code>null</code> and contains all the same time value fields
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* as this object.
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*
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* @param ts The <code>Timestamp</code> to test against for equality.
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*
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* @return <code>true</code> if the specified object is equal to this
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* object, <code>false</code> otherwise.
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*/
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public boolean equals(Timestamp ts)
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{
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if (ts == null)
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return false;
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if (ts.getTime() != getTime())
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return false;
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if (ts.getNanos() != getNanos())
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return false;
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return true;
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}
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/**
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* Compares this <code>Timestamp</code> to another one.
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*
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* @param ts The other Timestamp.
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* @return <code>0</code>, if both <code>Timestamp</code>'s represent exactly
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* the same date, a negative value if this <code>Timestamp</code> is
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* before the specified <code>Timestamp</code> and a positive value
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* otherwise.
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* @since 1.2
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*/
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public int compareTo(Timestamp ts)
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{
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int s = super.compareTo((java.util.Date) ts);
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if (s != 0)
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return s;
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// If Date components were equal, then we check the nanoseconds.
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return nanos - ts.nanos;
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}
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/**
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* Compares this <code>Timestamp</code> to another one. This behaves like
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* <code>compareTo(Timestamp)</code>, but it may throw a
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* <code>ClassCastException</code>, if the specified object is not of type
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* <code>Timestamp</code>.
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*
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* @param obj The object to compare with.
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* @return <code>0</code>, if both <code>Timestamp</code>'s represent exactly
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* the same date, a negative value if this <code>Timestamp</code> is
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* before the specified <code>Timestamp</code> and a positive value
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* otherwise.
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* @exception ClassCastException if obj is not of type Timestamp.
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* @see #compareTo(Timestamp)
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* @since 1.2
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*/
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public int compareTo(java.util.Date obj)
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{
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return compareTo((Timestamp) obj);
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}
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}
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