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Time.java 9.13 KB
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Stefan 提交于 2021年03月18日 23:35 +08:00 . init
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/*
* Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.sql;
import java.time.Instant;
import java.time.LocalTime;
/**
* <P>A thin wrapper around the <code>java.util.Date</code> class that allows the JDBC
* API to identify this as an SQL <code>TIME</code> value. The <code>Time</code>
* class adds formatting and
* parsing operations to support the JDBC escape syntax for time
* values.
* <p>The date components should be set to the "zero epoch"
* value of January 1, 1970 and should not be accessed.
*
* @since 1.1
*/
public class Time extends java.util.Date {
/**
* Constructs a <code>Time</code> object initialized with the
* given values for the hour, minute, and second.
* The driver sets the date components to January 1, 1970.
* Any method that attempts to access the date components of a
* <code>Time</code> object will throw a
* <code>java.lang.IllegalArgumentException</code>.
* <P>
* The result is undefined if a given argument is out of bounds.
*
* @param hour 0 to 23
* @param minute 0 to 59
* @param second 0 to 59
*
* @deprecated Use the constructor that takes a milliseconds value
* in place of this constructor
*/
@Deprecated(since="1.2")
public Time(int hour, int minute, int second) {
super(70, 0, 1, hour, minute, second);
}
/**
* Constructs a <code>Time</code> object using a milliseconds time value.
*
* @param time milliseconds since January 1, 1970, 00:00:00 GMT;
* a negative number is milliseconds before
* January 1, 1970, 00:00:00 GMT
*/
public Time(long time) {
super(time);
}
/**
* Sets a <code>Time</code> object using a milliseconds time value.
*
* @param time milliseconds since January 1, 1970, 00:00:00 GMT;
* a negative number is milliseconds before
* January 1, 1970, 00:00:00 GMT
*/
public void setTime(long time) {
super.setTime(time);
}
/**
* Converts a string in JDBC time escape format to a <code>Time</code> value.
*
* @param s time in format "hh:mm:ss"
* @return a corresponding <code>Time</code> object
*/
public static Time valueOf(String s) {
if (s == null) throw new java.lang.IllegalArgumentException();
int hour;
int minute;
int second;
int firstColon = s.indexOf(':');
int secondColon = s.indexOf(':', firstColon + 1);
int len = s.length();
if (firstColon > 0 && secondColon > 0 &&
secondColon < len - 1) {
hour = Integer.parseInt(s, 0, firstColon, 10);
minute = Integer.parseInt(s, firstColon + 1, secondColon, 10);
second = Integer.parseInt(s, secondColon + 1, len, 10);
} else {
throw new java.lang.IllegalArgumentException();
}
return new Time(hour, minute, second);
}
/**
* Formats a time in JDBC time escape format.
*
* @return a <code>String</code> in hh:mm:ss format
*/
@SuppressWarnings("deprecation")
public String toString () {
int hour = super.getHours();
int minute = super.getMinutes();
int second = super.getSeconds();
char[] buf = new char[8];
Date.formatDecimalInt(hour, buf, 0, 2);
buf[2] = ':';
Date.formatDecimalInt(minute, buf, 3, 2);
buf[5] = ':';
Date.formatDecimalInt(second, buf, 6, 2);
return new String(buf);
}
// Override all the date operations inherited from java.util.Date;
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a year component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #setYear
*/
@Deprecated(since="1.2")
public int getYear() {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a month component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #setMonth
*/
@Deprecated(since="1.2")
public int getMonth() {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a day component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
*/
@Deprecated(since="1.2")
public int getDay() {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a date component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #setDate
*/
@Deprecated(since="1.2")
public int getDate() {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a year component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #getYear
*/
@Deprecated(since="1.2")
public void setYear(int i) {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a month component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #getMonth
*/
@Deprecated(since="1.2")
public void setMonth(int i) {
throw new java.lang.IllegalArgumentException();
}
/**
* This method is deprecated and should not be used because SQL <code>TIME</code>
* values do not have a date component.
*
* @deprecated
* @exception java.lang.IllegalArgumentException if this
* method is invoked
* @see #getDate
*/
@Deprecated(since="1.2")
public void setDate(int i) {
throw new java.lang.IllegalArgumentException();
}
/**
* Private serial version unique ID to ensure serialization
* compatibility.
*/
static final long serialVersionUID = 8397324403548013681L;
/**
* Obtains an instance of {@code Time} from a {@link LocalTime} object
* with the same hour, minute and second time value as the given
* {@code LocalTime}. The nanosecond field from {@code LocalTime} is
* not part of the newly created {@code Time} object.
*
* @param time a {@code LocalTime} to convert
* @return a {@code Time} object
* @exception NullPointerException if {@code time} is null
* @since 1.8
*/
@SuppressWarnings("deprecation")
public static Time valueOf(LocalTime time) {
return new Time(time.getHour(), time.getMinute(), time.getSecond());
}
/**
* Converts this {@code Time} object to a {@code LocalTime}.
* <p>
* The conversion creates a {@code LocalTime} that represents the same
* hour, minute, and second time value as this {@code Time}. The
* nanosecond {@code LocalTime} field will be set to zero.
*
* @return a {@code LocalTime} object representing the same time value
* @since 1.8
*/
@SuppressWarnings("deprecation")
public LocalTime toLocalTime() {
return LocalTime.of(getHours(), getMinutes(), getSeconds());
}
/**
* This method always throws an UnsupportedOperationException and should
* not be used because SQL {@code Time} values do not have a date
* component.
*
* @exception java.lang.UnsupportedOperationException if this method is invoked
*/
@Override
public Instant toInstant() {
throw new java.lang.UnsupportedOperationException();
}
}
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