JDK8/Java8源码在线阅读
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package java.sql;
import java.time.Instant;
import java.time.LocalDateTime;
import java.util.StringTokenizer;
/**
* <P>A thin wrapper around <code>java.util.Date</code> that allows
* the JDBC API to identify this as an SQL <code>TIMESTAMP</code> value.
* It adds the ability
* to hold the SQL <code>TIMESTAMP</code> fractional seconds value, by allowing
* the specification of fractional seconds to a precision of nanoseconds.
* A Timestamp also provides formatting and
* parsing operations to support the JDBC escape syntax for timestamp values.
*
* <p>The precision of a Timestamp object is calculated to be either:
* <ul>
* <li><code>19 </code>, which is the number of characters in yyyy-mm-dd hh:mm:ss
* <li> <code> 20 + s </code>, which is the number
* of characters in the yyyy-mm-dd hh:mm:ss.[fff...] and <code>s</code> represents the scale of the given Timestamp,
* its fractional seconds precision.
*</ul>
*
* <P><B>Note:</B> This type is a composite of a <code>java.util.Date</code> and a
* separate nanoseconds value. Only integral seconds are stored in the
* <code>java.util.Date</code> component. The fractional seconds - the nanos - are
* separate. The <code>Timestamp.equals(Object)</code> method never returns
* <code>true</code> when passed an object
* that isn't an instance of <code>java.sql.Timestamp</code>,
* because the nanos component of a date is unknown.
* As a result, the <code>Timestamp.equals(Object)</code>
* method is not symmetric with respect to the
* <code>java.util.Date.equals(Object)</code>
* method. Also, the <code>hashCode</code> method uses the underlying
* <code>java.util.Date</code>
* implementation and therefore does not include nanos in its computation.
* <P>
* Due to the differences between the <code>Timestamp</code> class
* and the <code>java.util.Date</code>
* class mentioned above, it is recommended that code not view
* <code>Timestamp</code> values generically as an instance of
* <code>java.util.Date</code>. The
* inheritance relationship between <code>Timestamp</code>
* and <code>java.util.Date</code> really
* denotes implementation inheritance, and not type inheritance.
*/
public class Timestamp extends java.util.Date {
/**
* Constructs a <code>Timestamp</code> object initialized
* with the given values.
*
* @param year the year minus 1900
* @param month 0 to 11
* @param date 1 to 31
* @param hour 0 to 23
* @param minute 0 to 59
* @param second 0 to 59
* @param nano 0 to 999,999,999
* @deprecated instead use the constructor <code>Timestamp(long millis)</code>
* @exception IllegalArgumentException if the nano argument is out of bounds
*/
@Deprecated
public Timestamp(int year, int month, int date,
int hour, int minute, int second, int nano) {
super(year, month, date, hour, minute, second);
if (nano > 999999999 || nano < 0) {
throw new IllegalArgumentException("nanos > 999999999 or < 0");
}
nanos = nano;
}
/**
* Constructs a <code>Timestamp</code> object
* using a milliseconds time value. The
* integral seconds are stored in the underlying date value; the
* fractional seconds are stored in the <code>nanos</code> field of
* the <code>Timestamp</code> object.
*
* @param time milliseconds since January 1, 1970, 00:00:00 GMT.
* A negative number is the number of milliseconds before
* January 1, 1970, 00:00:00 GMT.
* @see java.util.Calendar
*/
public Timestamp(long time) {
super((time/1000)*1000);
nanos = (int)((time%1000) * 1000000);
if (nanos < 0) {
nanos = 1000000000 + nanos;
super.setTime(((time/1000)-1)*1000);
}
}
/**
* Sets this <code>Timestamp</code> object to represent a point in time that is
* <tt>time</tt> milliseconds after January 1, 1970 00:00:00 GMT.
*
* @param time the number of milliseconds.
* @see #getTime
* @see #Timestamp(long time)
* @see java.util.Calendar
*/
public void setTime(long time) {
super.setTime((time/1000)*1000);
nanos = (int)((time%1000) * 1000000);
if (nanos < 0) {
nanos = 1000000000 + nanos;
super.setTime(((time/1000)-1)*1000);
}
}
/**
* Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT
* represented by this <code>Timestamp</code> object.
*
* @return the number of milliseconds since January 1, 1970, 00:00:00 GMT
* represented by this date.
* @see #setTime
*/
public long getTime() {
long time = super.getTime();
return (time + (nanos / 1000000));
}
/**
* @serial
*/
private int nanos;
/**
* Converts a <code>String</code> object in JDBC timestamp escape format to a
* <code>Timestamp</code> value.
*
* @param s timestamp in format <code>yyyy-[m]m-[d]d hh:mm:ss[.f...]</code>. The
* fractional seconds may be omitted. The leading zero for <code>mm</code>
* and <code>dd</code> may also be omitted.
*
* @return corresponding <code>Timestamp</code> value
* @exception java.lang.IllegalArgumentException if the given argument
* does not have the format <code>yyyy-[m]m-[d]d hh:mm:ss[.f...]</code>
*/
public static Timestamp valueOf(String s) {
final int YEAR_LENGTH = 4;
final int MONTH_LENGTH = 2;
final int DAY_LENGTH = 2;
final int MAX_MONTH = 12;
final int MAX_DAY = 31;
String date_s;
String time_s;
String nanos_s;
int year = 0;
int month = 0;
int day = 0;
int hour;
int minute;
int second;
int a_nanos = 0;
int firstDash;
int secondDash;
int dividingSpace;
int firstColon = 0;
int secondColon = 0;
int period = 0;
String formatError = "Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff]";
String zeros = "000000000";
String delimiterDate = "-";
String delimiterTime = ":";
if (s == null) throw new java.lang.IllegalArgumentException("null string");
// Split the string into date and time components
s = s.trim();
dividingSpace = s.indexOf(' ');
if (dividingSpace > 0) {
date_s = s.substring(0,dividingSpace);
time_s = s.substring(dividingSpace+1);
} else {
throw new java.lang.IllegalArgumentException(formatError);
}
// Parse the date
firstDash = date_s.indexOf('-');
secondDash = date_s.indexOf('-', firstDash+1);
// Parse the time
if (time_s == null)
throw new java.lang.IllegalArgumentException(formatError);
firstColon = time_s.indexOf(':');
secondColon = time_s.indexOf(':', firstColon+1);
period = time_s.indexOf('.', secondColon+1);
// Convert the date
boolean parsedDate = false;
if ((firstDash > 0) && (secondDash > 0) && (secondDash < date_s.length() - 1)) {
String yyyy = date_s.substring(0, firstDash);
String mm = date_s.substring(firstDash + 1, secondDash);
String dd = date_s.substring(secondDash + 1);
if (yyyy.length() == YEAR_LENGTH &&
(mm.length() >= 1 && mm.length() <= MONTH_LENGTH) &&
(dd.length() >= 1 && dd.length() <= DAY_LENGTH)) {
year = Integer.parseInt(yyyy);
month = Integer.parseInt(mm);
day = Integer.parseInt(dd);
if ((month >= 1 && month <= MAX_MONTH) && (day >= 1 && day <= MAX_DAY)) {
parsedDate = true;
}
}
}
if (! parsedDate) {
throw new java.lang.IllegalArgumentException(formatError);
}
// Convert the time; default missing nanos
if ((firstColon > 0) & (secondColon > 0) &
(secondColon < time_s.length()-1)) {
hour = Integer.parseInt(time_s.substring(0, firstColon));
minute =
Integer.parseInt(time_s.substring(firstColon+1, secondColon));
if ((period > 0) & (period < time_s.length()-1)) {
second =
Integer.parseInt(time_s.substring(secondColon+1, period));
nanos_s = time_s.substring(period+1);
if (nanos_s.length() > 9)
throw new java.lang.IllegalArgumentException(formatError);
if (!Character.isDigit(nanos_s.charAt(0)))
throw new java.lang.IllegalArgumentException(formatError);
nanos_s = nanos_s + zeros.substring(0,9-nanos_s.length());
a_nanos = Integer.parseInt(nanos_s);
} else if (period > 0) {
throw new java.lang.IllegalArgumentException(formatError);
} else {
second = Integer.parseInt(time_s.substring(secondColon+1));
}
} else {
throw new java.lang.IllegalArgumentException(formatError);
}
return new Timestamp(year - 1900, month - 1, day, hour, minute, second, a_nanos);
}
/**
* Formats a timestamp in JDBC timestamp escape format.
* <code>yyyy-mm-dd hh:mm:ss.fffffffff</code>,
* where <code>ffffffffff</code> indicates nanoseconds.
* <P>
* @return a <code>String</code> object in
* <code>yyyy-mm-dd hh:mm:ss.fffffffff</code> format
*/
@SuppressWarnings("deprecation")
public String toString () {
int year = super.getYear() + 1900;
int month = super.getMonth() + 1;
int day = super.getDate();
int hour = super.getHours();
int minute = super.getMinutes();
int second = super.getSeconds();
String yearString;
String monthString;
String dayString;
String hourString;
String minuteString;
String secondString;
String nanosString;
String zeros = "000000000";
String yearZeros = "0000";
StringBuffer timestampBuf;
if (year < 1000) {
// Add leading zeros
yearString = "" + year;
yearString = yearZeros.substring(0, (4-yearString.length())) +
yearString;
} else {
yearString = "" + year;
}
if (month < 10) {
monthString = "0" + month;
} else {
monthString = Integer.toString(month);
}
if (day < 10) {
dayString = "0" + day;
} else {
dayString = Integer.toString(day);
}
if (hour < 10) {
hourString = "0" + hour;
} else {
hourString = Integer.toString(hour);
}
if (minute < 10) {
minuteString = "0" + minute;
} else {
minuteString = Integer.toString(minute);
}
if (second < 10) {
secondString = "0" + second;
} else {
secondString = Integer.toString(second);
}
if (nanos == 0) {
nanosString = "0";
} else {
nanosString = Integer.toString(nanos);
// Add leading zeros
nanosString = zeros.substring(0, (9-nanosString.length())) +
nanosString;
// Truncate trailing zeros
char[] nanosChar = new char[nanosString.length()];
nanosString.getChars(0, nanosString.length(), nanosChar, 0);
int truncIndex = 8;
while (nanosChar[truncIndex] == '0') {
truncIndex--;
}
nanosString = new String(nanosChar, 0, truncIndex + 1);
}
// do a string buffer here instead.
timestampBuf = new StringBuffer(20+nanosString.length());
timestampBuf.append(yearString);
timestampBuf.append("-");
timestampBuf.append(monthString);
timestampBuf.append("-");
timestampBuf.append(dayString);
timestampBuf.append(" ");
timestampBuf.append(hourString);
timestampBuf.append(":");
timestampBuf.append(minuteString);
timestampBuf.append(":");
timestampBuf.append(secondString);
timestampBuf.append(".");
timestampBuf.append(nanosString);
return (timestampBuf.toString());
}
/**
* Gets this <code>Timestamp</code> object's <code>nanos</code> value.
*
* @return this <code>Timestamp</code> object's fractional seconds component
* @see #setNanos
*/
public int getNanos() {
return nanos;
}
/**
* Sets this <code>Timestamp</code> object's <code>nanos</code> field
* to the given value.
*
* @param n the new fractional seconds component
* @exception java.lang.IllegalArgumentException if the given argument
* is greater than 999999999 or less than 0
* @see #getNanos
*/
public void setNanos(int n) {
if (n > 999999999 || n < 0) {
throw new IllegalArgumentException("nanos > 999999999 or < 0");
}
nanos = n;
}
/**
* Tests to see if this <code>Timestamp</code> object is
* equal to the given <code>Timestamp</code> object.
*
* @param ts the <code>Timestamp</code> value to compare with
* @return <code>true</code> if the given <code>Timestamp</code>
* object is equal to this <code>Timestamp</code> object;
* <code>false</code> otherwise
*/
public boolean equals(Timestamp ts) {
if (super.equals(ts)) {
if (nanos == ts.nanos) {
return true;
} else {
return false;
}
} else {
return false;
}
}
/**
* Tests to see if this <code>Timestamp</code> object is
* equal to the given object.
*
* This version of the method <code>equals</code> has been added
* to fix the incorrect
* signature of <code>Timestamp.equals(Timestamp)</code> and to preserve backward
* compatibility with existing class files.
*
* Note: This method is not symmetric with respect to the
* <code>equals(Object)</code> method in the base class.
*
* @param ts the <code>Object</code> value to compare with
* @return <code>true</code> if the given <code>Object</code> is an instance
* of a <code>Timestamp</code> that
* is equal to this <code>Timestamp</code> object;
* <code>false</code> otherwise
*/
public boolean equals(java.lang.Object ts) {
if (ts instanceof Timestamp) {
return this.equals((Timestamp)ts);
} else {
return false;
}
}
/**
* Indicates whether this <code>Timestamp</code> object is
* earlier than the given <code>Timestamp</code> object.
*
* @param ts the <code>Timestamp</code> value to compare with
* @return <code>true</code> if this <code>Timestamp</code> object is earlier;
* <code>false</code> otherwise
*/
public boolean before(Timestamp ts) {
return compareTo(ts) < 0;
}
/**
* Indicates whether this <code>Timestamp</code> object is
* later than the given <code>Timestamp</code> object.
*
* @param ts the <code>Timestamp</code> value to compare with
* @return <code>true</code> if this <code>Timestamp</code> object is later;
* <code>false</code> otherwise
*/
public boolean after(Timestamp ts) {
return compareTo(ts) > 0;
}
/**
* Compares this <code>Timestamp</code> object to the given
* <code>Timestamp</code> object.
*
* @param ts the <code>Timestamp</code> object to be compared to
* this <code>Timestamp</code> object
* @return the value <code>0</code> if the two <code>Timestamp</code>
* objects are equal; a value less than <code>0</code> if this
* <code>Timestamp</code> object is before the given argument;
* and a value greater than <code>0</code> if this
* <code>Timestamp</code> object is after the given argument.
* @since 1.4
*/
public int compareTo(Timestamp ts) {
long thisTime = this.getTime();
long anotherTime = ts.getTime();
int i = (thisTime<anotherTime ? -1 :(thisTime==anotherTime?0 :1));
if (i == 0) {
if (nanos > ts.nanos) {
return 1;
} else if (nanos < ts.nanos) {
return -1;
}
}
return i;
}
/**
* Compares this <code>Timestamp</code> object to the given
* <code>Date</code> object.
*
* @param o the <code>Date</code> to be compared to
* this <code>Timestamp</code> object
* @return the value <code>0</code> if this <code>Timestamp</code> object
* and the given object are equal; a value less than <code>0</code>
* if this <code>Timestamp</code> object is before the given argument;
* and a value greater than <code>0</code> if this
* <code>Timestamp</code> object is after the given argument.
*
* @since 1.5
*/
public int compareTo(java.util.Date o) {
if(o instanceof Timestamp) {
// When Timestamp instance compare it with a Timestamp
// Hence it is basically calling this.compareTo((Timestamp))o);
// Note typecasting is safe because o is instance of Timestamp
return compareTo((Timestamp)o);
} else {
// When Date doing a o.compareTo(this)
// will give wrong results.
Timestamp ts = new Timestamp(o.getTime());
return this.compareTo(ts);
}
}
/**
* {@inheritDoc}
*
* The {@code hashCode} method uses the underlying {@code java.util.Date}
* implementation and therefore does not include nanos in its computation.
*
*/
@Override
public int hashCode() {
return super.hashCode();
}
static final long serialVersionUID = 2745179027874758501L;
private static final int MILLIS_PER_SECOND = 1000;
/**
* Obtains an instance of {@code Timestamp} from a {@code LocalDateTime}
* object, with the same year, month, day of month, hours, minutes,
* seconds and nanos date-time value as the provided {@code LocalDateTime}.
* <p>
* The provided {@code LocalDateTime} is interpreted as the local
* date-time in the local time zone.
*
* @param dateTime a {@code LocalDateTime} to convert
* @return a {@code Timestamp} object
* @exception NullPointerException if {@code dateTime} is null.
* @since 1.8
*/
@SuppressWarnings("deprecation")
public static Timestamp valueOf(LocalDateTime dateTime) {
return new Timestamp(dateTime.getYear() - 1900,
dateTime.getMonthValue() - 1,
dateTime.getDayOfMonth(),
dateTime.getHour(),
dateTime.getMinute(),
dateTime.getSecond(),
dateTime.getNano());
}
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