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/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.value;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.TimeZone;
import org.h2.constant.ErrorCode;
import org.h2.message.DbException;
import org.h2.util.DateTimeUtils;
import org.h2.util.MathUtils;
/**
* Implementation of the TIMESTAMP data type.
*/
public class ValueTimestamp extends Value {
/**
* The precision in digits.
*/
public static final int PRECISION = 23;
/**
* The display size of the textual representation of a timestamp.
* Example: 2001-01-01 23:59:59.000
*/
static final int DISPLAY_SIZE = 23;
/**
* The default scale for timestamps.
*/
static final int DEFAULT_SCALE = 10;
private final long dateValue;
private final long nanos;
private ValueTimestamp(long dateValue, long nanos) {
this.dateValue = dateValue;
this.nanos = nanos;
}
/**
* Get or create a date value for the given date.
*
* @param dateValue the date value
* @param nanos the nanoseconds
* @return the value
*/
public static ValueTimestamp fromDateValueAndNanos(long dateValue, long nanos) {
return (ValueTimestamp) Value.cache(new ValueTimestamp(dateValue, nanos));
}
/**
* Get or create a timestamp value for the given timestamp.
*
* @param timestamp the timestamp
* @return the value
*/
public static ValueTimestamp get(Timestamp timestamp) {
long ms = timestamp.getTime();
long nanos = timestamp.getNanos() % 1000000;
long dateValue = DateTimeUtils.dateValueFromDate(ms);
nanos += DateTimeUtils.nanosFromDate(ms);
return fromDateValueAndNanos(dateValue, nanos);
}
/**
* Parse a string to a ValueTimestamp. This method supports the format
* +/-year-month-day hour:minute:seconds.fractional and an optional timezone
* part.
*
* @param s the string to parse
* @return the date
*/
public static ValueTimestamp parse(String s) {
try {
return parseTry(s);
} catch (Exception e) {
throw DbException.get(ErrorCode.INVALID_DATETIME_CONSTANT_2,
e, "TIMESTAMP", s);
}
}
private static ValueTimestamp parseTry(String s) {
int dateEnd = s.indexOf(' ');
if (dateEnd < 0) {
// ISO 8601 compatibility
dateEnd = s.indexOf('T');
}
int timeStart;
if (dateEnd < 0) {
dateEnd = s.length();
timeStart = -1;
} else {
timeStart = dateEnd + 1;
}
long dateValue = DateTimeUtils.parseDateValue(s, 0, dateEnd);
long nanos;
if (timeStart < 0) {
nanos = 0;
} else {
int timeEnd = s.length();
TimeZone tz = null;
if (s.endsWith("Z")) {
tz = TimeZone.getTimeZone("UTC");
timeEnd--;
} else {
int timeZoneStart = s.indexOf('+', dateEnd);
if (timeZoneStart < 0) {
timeZoneStart = s.indexOf('-', dateEnd);
}
if (timeZoneStart >= 0) {
String tzName = "GMT" + s.substring(timeZoneStart);
tz = TimeZone.getTimeZone(tzName);
if (!tz.getID().startsWith(tzName)) {
throw new IllegalArgumentException(tzName);
}
timeEnd = timeZoneStart;
} else {
timeZoneStart = s.indexOf(' ', dateEnd + 1);
if (timeZoneStart > 0) {
String tzName = s.substring(timeZoneStart + 1);
tz = TimeZone.getTimeZone(tzName);
if (!tz.getID().startsWith(tzName)) {
throw new IllegalArgumentException(tzName);
}
timeEnd = timeZoneStart;
}
}
}
nanos = DateTimeUtils.parseTimeNanos(s, dateEnd + 1, timeEnd, true);
if (tz != null) {
int year = DateTimeUtils.yearFromDateValue(dateValue);
int month = DateTimeUtils.monthFromDateValue(dateValue);
int day = DateTimeUtils.dayFromDateValue(dateValue);
long ms = nanos / 1000000;
nanos -= ms * 1000000;
long second = ms / 1000;
ms -= second * 1000;
int minute = (int) (second / 60);
second -= minute * 60;
int hour = minute / 60;
minute -= hour * 60;
long millis = DateTimeUtils.getMillis(tz, year, month, day, hour, minute, (int) second, (int) ms);
ms = DateTimeUtils.convertToLocal(new Date(millis), Calendar.getInstance(TimeZone.getTimeZone("UTC")));
long md = DateTimeUtils.MILLIS_PER_DAY;
long absoluteDay = (ms >= 0 ? ms : ms - md + 1) / md;
ms -= absoluteDay * md;
nanos += ms * 1000000;
}
}
return ValueTimestamp.fromDateValueAndNanos(dateValue, nanos);
}
public long getDateValue() {
return dateValue;
}
public long getNanos() {
return nanos;
}
public Timestamp getTimestamp() {
return DateTimeUtils.convertDateValueToTimestamp(dateValue, nanos);
}
public int getType() {
return Value.TIMESTAMP;
}
public String getString() {
StringBuilder buff = new StringBuilder(DISPLAY_SIZE);
ValueDate.appendDate(buff, dateValue);
buff.append(' ');
ValueTime.appendTime(buff, nanos, true);
return buff.toString();
}
public String getSQL() {
return "TIMESTAMP '" + getString() + "'";
}
public long getPrecision() {
return PRECISION;
}
public int getScale() {
return DEFAULT_SCALE;
}
public int getDisplaySize() {
return DISPLAY_SIZE;
}
public Value convertScale(boolean onlyToSmallerScale, int targetScale) {
if (targetScale >= DEFAULT_SCALE) {
return this;
}
if (targetScale < 0) {
throw DbException.getInvalidValueException("scale", targetScale);
}
long n = nanos;
BigDecimal bd = BigDecimal.valueOf(n);
bd = bd.movePointLeft(9);
bd = MathUtils.setScale(bd, targetScale);
bd = bd.movePointRight(9);
long n2 = bd.longValue();
if (n2 == n) {
return this;
}
return fromDateValueAndNanos(dateValue, n2);
}
protected int compareSecure(Value o, CompareMode mode) {
ValueTimestamp t = (ValueTimestamp) o;
int c = MathUtils.compareLong(dateValue, t.dateValue);
if (c != 0) {
return c;
}
return MathUtils.compareLong(nanos, t.nanos);
}
public boolean equals(Object other) {
if (this == other) {
return true;
} else if (!(other instanceof ValueTimestamp)) {
return false;
}
ValueTimestamp x = (ValueTimestamp) other;
return dateValue == x.dateValue && nanos == x.nanos;
}
public int hashCode() {
return (int) (dateValue ^ (dateValue >>> 32) ^ nanos ^ (nanos >>> 32));
}
public Object getObject() {
return getTimestamp();
}
public void set(PreparedStatement prep, int parameterIndex) throws SQLException {
prep.setTimestamp(parameterIndex, getTimestamp());
}
public Value add(Value v) {
ValueTimestamp t = (ValueTimestamp) v.convertTo(Value.TIMESTAMP);
long d1 = DateTimeUtils.absoluteDayFromDateValue(dateValue);
long d2 = DateTimeUtils.absoluteDayFromDateValue(t.dateValue);
return DateTimeUtils.normalizeTimestamp(d1 + d2, nanos + t.nanos);
}
public Value subtract(Value v) {
ValueTimestamp t = (ValueTimestamp) v.convertTo(Value.TIMESTAMP);
long d1 = DateTimeUtils.absoluteDayFromDateValue(dateValue);
long d2 = DateTimeUtils.absoluteDayFromDateValue(t.dateValue);
return DateTimeUtils.normalizeTimestamp(d1 - d2, nanos - t.nanos);
}
}
