org.joda.time.field.RemainderDateTimeField Maven / Gradle / Ivy
/*
* Copyright 2001-2013 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.field;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeFieldType;
import org.joda.time.DurationField;
/**
* Counterpart remainder datetime field to {@link DividedDateTimeField}. The
* field's unit duration is unchanged, but the range duration is scaled
* accordingly.
*
* RemainderDateTimeField is thread-safe and immutable.
*
* @see DividedDateTimeField
*
* @author Brian S O'Neill
* @since 1.0
*/
public class RemainderDateTimeField extends DecoratedDateTimeField {
@SuppressWarnings("unused")
private static final long serialVersionUID = 5708241235177666790L;
// Shared with DividedDateTimeField.
final int iDivisor;
final DurationField iRangeField;
/**
* Constructor.
*
* @param field the field to wrap, like "year()".
* @param type the field type this field actually uses
* @param divisor divisor, such as 100 years in a century
* @throws IllegalArgumentException if divisor is less than two
*/
public RemainderDateTimeField(DateTimeField field,
DateTimeFieldType type, int divisor) {
super(field, type);
if (divisor < 2) {
throw new IllegalArgumentException("The divisor must be at least 2");
}
DurationField rangeField = field.getDurationField();
if (rangeField == null) {
iRangeField = null;
} else {
iRangeField = new ScaledDurationField(
rangeField, type.getRangeDurationType(), divisor);
}
iDivisor = divisor;
}
/**
* Construct a RemainderDateTimeField that compliments the given
* DividedDateTimeField.
*
* @param dividedField complimentary divided field, like "century()".
*/
public RemainderDateTimeField(DividedDateTimeField dividedField) {
this(dividedField, dividedField.getType());
}
/**
* Construct a RemainderDateTimeField that compliments the given
* DividedDateTimeField.
*
* @param dividedField complimentary divided field, like "century()".
* @param type the field type this field actually uses
*/
public RemainderDateTimeField(DividedDateTimeField dividedField, DateTimeFieldType type) {
super(dividedField.getWrappedField(), type);
iDivisor = dividedField.iDivisor;
iRangeField = dividedField.iDurationField;
}
//-----------------------------------------------------------------------
/**
* Get the remainder from the specified time instant.
*
* @param instant the time instant in millis to query.
* @return the remainder extracted from the input.
*/
public int get(long instant) {
int value = getWrappedField().get(instant);
if (value >= 0) {
return value % iDivisor;
} else {
return (iDivisor - 1) + ((value + 1) % iDivisor);
}
}
/**
* Add the specified amount to the specified time instant, wrapping around
* within the remainder range if necessary. The amount added may be
* negative.
*
* @param instant the time instant in millis to update.
* @param amount the amount to add (can be negative).
* @return the updated time instant.
*/
public long addWrapField(long instant, int amount) {
return set(instant, FieldUtils.getWrappedValue(get(instant), amount, 0, iDivisor - 1));
}
/**
* Set the specified amount of remainder units to the specified time instant.
*
* @param instant the time instant in millis to update.
* @param value value of remainder units to set.
* @return the updated time instant.
* @throws IllegalArgumentException if value is too large or too small.
*/
public long set(long instant, int value) {
FieldUtils.verifyValueBounds(this, value, 0, iDivisor - 1);
int divided = getDivided(getWrappedField().get(instant));
return getWrappedField().set(instant, divided * iDivisor + value);
}
/**
* Returns a scaled version of the wrapped field's unit duration field.
*/
public DurationField getRangeDurationField() {
return iRangeField;
}
/**
* Get the minimum value for the field, which is always zero.
*
* @return the minimum value of zero.
*/
public int getMinimumValue() {
return 0;
}
/**
* Get the maximum value for the field, which is always one less than the
* divisor.
*
* @return the maximum value
*/
public int getMaximumValue() {
return iDivisor - 1;
}
public long roundFloor(long instant) {
return getWrappedField().roundFloor(instant);
}
public long roundCeiling(long instant) {
return getWrappedField().roundCeiling(instant);
}
public long roundHalfFloor(long instant) {
return getWrappedField().roundHalfFloor(instant);
}
public long roundHalfCeiling(long instant) {
return getWrappedField().roundHalfCeiling(instant);
}
public long roundHalfEven(long instant) {
return getWrappedField().roundHalfEven(instant);
}
public long remainder(long instant) {
return getWrappedField().remainder(instant);
}
/**
* Returns the divisor applied, in the field's units.
*
* @return the divisor
*/
public int getDivisor() {
return iDivisor;
}
private int getDivided(int value) {
if (value >= 0) {
return value / iDivisor;
} else {
return ((value + 1) / iDivisor) - 1;
}
}
}