org.joda.time.base.AbstractInterval Maven / Gradle / Ivy
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/*
* Copyright 2001-2011 Stephen Colebourne
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joda.time.base;
import org.joda.time.DateTime;
import org.joda.time.DateTimeUtils;
import org.joda.time.Duration;
import org.joda.time.Interval;
import org.joda.time.MutableInterval;
import org.joda.time.Period;
import org.joda.time.PeriodType;
import org.joda.time.ReadableInstant;
import org.joda.time.ReadableInterval;
import org.joda.time.field.FieldUtils;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
/**
* AbstractInterval provides the common behaviour for time intervals.
*
* This class should generally not be used directly by API users. The
* {@link ReadableInterval} interface should be used when different
* kinds of intervals are to be referenced.
*
* AbstractInterval subclasses may be mutable and not thread-safe.
*
* @author Brian S O'Neill
* @author Stephen Colebourne
* @since 1.0
*/
public abstract class AbstractInterval implements ReadableInterval {
/**
* Constructor.
*/
protected AbstractInterval() {
super();
}
//-----------------------------------------------------------------------
/**
* Validates an interval.
*
* @param start the start instant in milliseconds
* @param end the end instant in milliseconds
* @throws IllegalArgumentException if the interval is invalid
*/
protected void checkInterval(long start, long end) {
if (end < start) {
throw new IllegalArgumentException("The end instant must be greater or equal to the start");
}
}
//-----------------------------------------------------------------------
/**
* Gets the start of this time interval, which is inclusive, as a DateTime.
*
* @return the start of the time interval
*/
public DateTime getStart() {
return new DateTime(getStartMillis(), getChronology());
}
/**
* Gets the end of this time interval, which is exclusive, as a DateTime.
*
* @return the end of the time interval
*/
public DateTime getEnd() {
return new DateTime(getEndMillis(), getChronology());
}
//-----------------------------------------------------------------------
/**
* Does this time interval contain the specified millisecond instant.
*
* Non-zero duration intervals are inclusive of the start instant and
* exclusive of the end. A zero duration interval cannot contain anything.
*
* @param millisInstant the instant to compare to,
* millisecond instant from 1970-01-01T00:00:00Z
* @return true if this time interval contains the millisecond
*/
public boolean contains(long millisInstant) {
long thisStart = getStartMillis();
long thisEnd = getEndMillis();
return (millisInstant >= thisStart && millisInstant < thisEnd);
}
/**
* Does this time interval contain the current instant.
*
* Non-zero duration intervals are inclusive of the start instant and
* exclusive of the end. A zero duration interval cannot contain anything.
*
* @return true if this time interval contains the current instant
*/
public boolean containsNow() {
return contains(DateTimeUtils.currentTimeMillis());
}
/**
* Does this time interval contain the specified instant.
*
* Non-zero duration intervals are inclusive of the start instant and
* exclusive of the end. A zero duration interval cannot contain anything.
*
* For example:
*
* [09:00 to 10:00) contains 08:59 = false (before start)
* [09:00 to 10:00) contains 09:00 = true
* [09:00 to 10:00) contains 09:59 = true
* [09:00 to 10:00) contains 10:00 = false (equals end)
* [09:00 to 10:00) contains 10:01 = false (after end)
*
* [14:00 to 14:00) contains 14:00 = false (zero duration contains nothing)
*
* Passing in a null parameter will have the same effect as
* calling {@link #containsNow()}.
*
* @param instant the instant, null means now
* @return true if this time interval contains the instant
*/
public boolean contains(ReadableInstant instant) {
if (instant == null) {
return containsNow();
}
return contains(instant.getMillis());
}
/**
* Does this time interval contain the specified time interval.
*
* Non-zero duration intervals are inclusive of the start instant and
* exclusive of the end. The other interval is contained if this interval
* wholly contains, starts, finishes or equals it.
* A zero duration interval cannot contain anything.
*
* When two intervals are compared the result is one of three states:
* (a) they abut, (b) there is a gap between them, (c) they overlap.
* The contains method is not related to these states.
* In particular, a zero duration interval is contained at the start of
* a larger interval, but does not overlap (it abuts instead).
*
* For example:
*
* [09:00 to 10:00) contains [09:00 to 10:00) = true
* [09:00 to 10:00) contains [09:00 to 09:30) = true
* [09:00 to 10:00) contains [09:30 to 10:00) = true
* [09:00 to 10:00) contains [09:15 to 09:45) = true
* [09:00 to 10:00) contains [09:00 to 09:00) = true
*
* [09:00 to 10:00) contains [08:59 to 10:00) = false (otherStart before thisStart)
* [09:00 to 10:00) contains [09:00 to 10:01) = false (otherEnd after thisEnd)
* [09:00 to 10:00) contains [10:00 to 10:00) = false (otherStart equals thisEnd)
*
* [14:00 to 14:00) contains [14:00 to 14:00) = false (zero duration contains nothing)
*
* Passing in a null parameter will have the same effect as
* calling {@link #containsNow()}.
*
* @param interval the time interval to compare to, null means a zero duration interval now
* @return true if this time interval contains the time interval
*/
public boolean contains(ReadableInterval interval) {
if (interval == null) {
return containsNow();
}
long otherStart = interval.getStartMillis();
long otherEnd = interval.getEndMillis();
long thisStart = getStartMillis();
long thisEnd = getEndMillis();
return (thisStart <= otherStart && otherStart < thisEnd && otherEnd <= thisEnd);
}
/**
* Does this time interval overlap the specified time interval.
*
* Intervals are inclusive of the start instant and exclusive of the end.
* An interval overlaps another if it shares some common part of the
* datetime continuum.
*
* When two intervals are compared the result is one of three states:
* (a) they abut, (b) there is a gap between them, (c) they overlap.
* The abuts state takes precedence over the other two, thus a zero duration
* interval at the start of a larger interval abuts and does not overlap.
*
* For example:
*
* [09:00 to 10:00) overlaps [08:00 to 08:30) = false (completely before)
* [09:00 to 10:00) overlaps [08:00 to 09:00) = false (abuts before)
* [09:00 to 10:00) overlaps [08:00 to 09:30) = true
* [09:00 to 10:00) overlaps [08:00 to 10:00) = true
* [09:00 to 10:00) overlaps [08:00 to 11:00) = true
*
* [09:00 to 10:00) overlaps [09:00 to 09:00) = false (abuts before)
* [09:00 to 10:00) overlaps [09:00 to 09:30) = true
* [09:00 to 10:00) overlaps [09:00 to 10:00) = true
* [09:00 to 10:00) overlaps [09:00 to 11:00) = true
*
* [09:00 to 10:00) overlaps [09:30 to 09:30) = true
* [09:00 to 10:00) overlaps [09:30 to 10:00) = true
* [09:00 to 10:00) overlaps [09:30 to 11:00) = true
*
* [09:00 to 10:00) overlaps [10:00 to 10:00) = false (abuts after)
* [09:00 to 10:00) overlaps [10:00 to 11:00) = false (abuts after)
*
* [09:00 to 10:00) overlaps [10:30 to 11:00) = false (completely after)
*
* [14:00 to 14:00) overlaps [14:00 to 14:00) = false (abuts before and after)
* [14:00 to 14:00) overlaps [13:00 to 15:00) = true
*
*
* @param interval the time interval to compare to, null means a zero length interval now
* @return true if the time intervals overlap
*/
public boolean overlaps(ReadableInterval interval) {
long thisStart = getStartMillis();
long thisEnd = getEndMillis();
if (interval == null) {
long now = DateTimeUtils.currentTimeMillis();
return (thisStart < now && now < thisEnd);
} else {
long otherStart = interval.getStartMillis();
long otherEnd = interval.getEndMillis();
return (thisStart < otherEnd && otherStart < thisEnd);
}
}
//-----------------------------------------------------------------------
/**
* Is this time interval before the specified millisecond instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @param millisInstant the instant to compare to,
* millisecond instant from 1970-01-01T00:00:00Z
* @return true if this time interval is before the instant
*/
public boolean isBefore(long millisInstant) {
return (getEndMillis() <= millisInstant);
}
/**
* Is this time interval before the current instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @return true if this time interval is before the current instant
*/
public boolean isBeforeNow() {
return isBefore(DateTimeUtils.currentTimeMillis());
}
/**
* Is this time interval before the specified instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @param instant the instant to compare to, null means now
* @return true if this time interval is before the instant
*/
public boolean isBefore(ReadableInstant instant) {
if (instant == null) {
return isBeforeNow();
}
return isBefore(instant.getMillis());
}
/**
* Is this time interval entirely before the specified instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @param interval the interval to compare to, null means now
* @return true if this time interval is before the interval specified
*/
public boolean isBefore(ReadableInterval interval) {
if (interval == null) {
return isBeforeNow();
}
return isBefore(interval.getStartMillis());
}
//-----------------------------------------------------------------------
/**
* Is this time interval after the specified millisecond instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @param millisInstant the instant to compare to,
* millisecond instant from 1970-01-01T00:00:00Z
* @return true if this time interval is after the instant
*/
public boolean isAfter(long millisInstant) {
return (getStartMillis() > millisInstant);
}
/**
* Is this time interval after the current instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @return true if this time interval is after the current instant
*/
public boolean isAfterNow() {
return isAfter(DateTimeUtils.currentTimeMillis());
}
/**
* Is this time interval after the specified instant.
*
* Intervals are inclusive of the start instant and exclusive of the end.
*
* @param instant the instant to compare to, null means now
* @return true if this time interval is after the instant
*/
public boolean isAfter(ReadableInstant instant) {
if (instant == null) {
return isAfterNow();
}
return isAfter(instant.getMillis());
}
/**
* Is this time interval entirely after the specified interval.
*
* Intervals are inclusive of the start instant and exclusive of the end.
* Only the end time of the specified interval is used in the comparison.
*
* @param interval the interval to compare to, null means now
* @return true if this time interval is after the interval specified
*/
public boolean isAfter(ReadableInterval interval) {
long endMillis;
if (interval == null) {
endMillis = DateTimeUtils.currentTimeMillis();
} else {
endMillis = interval.getEndMillis();
}
return (getStartMillis() >= endMillis);
}
//-----------------------------------------------------------------------
/**
* Get this interval as an immutable Interval object.
*
* @return the interval as an Interval object
*/
public Interval toInterval() {
return new Interval(getStartMillis(), getEndMillis(), getChronology());
}
/**
* Get this time interval as a MutableInterval.
*
* This will always return a new MutableInterval with the same interval.
*
* @return the time interval as a MutableInterval object
*/
public MutableInterval toMutableInterval() {
return new MutableInterval(getStartMillis(), getEndMillis(), getChronology());
}
//-----------------------------------------------------------------------
/**
* Gets the duration of this time interval in milliseconds.
*
* The duration is equal to the end millis minus the start millis.
*
* @return the duration of the time interval in milliseconds
* @throws ArithmeticException if the duration exceeds the capacity of a long
*/
public long toDurationMillis() {
return FieldUtils.safeAdd(getEndMillis(), -getStartMillis());
}
/**
* Gets the duration of this time interval.
*
* The duration is equal to the end millis minus the start millis.
*
* @return the duration of the time interval
* @throws ArithmeticException if the duration exceeds the capacity of a long
*/
public Duration toDuration() {
long durMillis = toDurationMillis();
if (durMillis == 0) {
return Duration.ZERO;
} else {
return new Duration(durMillis);
}
}
//-----------------------------------------------------------------------
/**
* Converts the duration of the interval to a Period using the
* All period type.
*
* This method should be used to exract the field values describing the
* difference between the start and end instants.
*
* @return a time period derived from the interval
*/
public Period toPeriod() {
return new Period(getStartMillis(), getEndMillis(), getChronology());
}
/**
* Converts the duration of the interval to a Period using the
* specified period type.
*
* This method should be used to exract the field values describing the
* difference between the start and end instants.
*
* @param type the requested type of the duration, null means AllType
* @return a time period derived from the interval
*/
public Period toPeriod(PeriodType type) {
return new Period(getStartMillis(), getEndMillis(), type, getChronology());
}
//-----------------------------------------------------------------------
/**
* Compares this object with the specified object for equality based
* on start and end millis plus the chronology.
* All ReadableInterval instances are accepted.
*
* To compare the duration of two time intervals, use {@link #toDuration()}
* to get the durations and compare those.
*
* @param readableInterval a readable interval to check against
* @return true if the start and end millis are equal
*/
public boolean equals(Object readableInterval) {
if (this == readableInterval) {
return true;
}
if (readableInterval instanceof ReadableInterval == false) {
return false;
}
ReadableInterval other = (ReadableInterval) readableInterval;
return
getStartMillis() == other.getStartMillis() &&
getEndMillis() == other.getEndMillis() &&
FieldUtils.equals(getChronology(), other.getChronology());
}
/**
* Hashcode compatible with equals method.
*
* @return suitable hashcode
*/
public int hashCode() {
long start = getStartMillis();
long end = getEndMillis();
int result = 97;
result = 31 * result + ((int) (start ^ (start >>> 32)));
result = 31 * result + ((int) (end ^ (end >>> 32)));
result = 31 * result + getChronology().hashCode();
return result;
}
/**
* Output a string in ISO8601 interval format.
*
* From version 2.1, the string includes the time zone offset.
*
* @return re-parsable string (in the default zone)
*/
public String toString() {
DateTimeFormatter printer = ISODateTimeFormat.dateTime();
printer = printer.withChronology(getChronology());
StringBuffer buf = new StringBuffer(48);
printer.printTo(buf, getStartMillis());
buf.append('/');
printer.printTo(buf, getEndMillis());
return buf.toString();
}
}