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Java example source code file (RemainderDateTimeField.java)

This example Java source code file (RemainderDateTimeField.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

datetimefieldtype, decorateddatetimefield, durationfield, illegalargumentexception, override, remainderdatetimefield, scaleddurationfield, suppresswarnings, the

The RemainderDateTimeField.java Java example source code

/*
 *  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.
 * <p>
 * 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 iDurationField;
    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);
        }
        iDurationField = field.getDurationField();
        iDivisor = divisor;
    }

    /**
     * Constructor.
     * 
     * @param field  the field to wrap, like "year()".
     * @param rangeField  the range field
     * @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, DurationField rangeField,
                                  DateTimeFieldType type, int divisor) {
        super(field, type);
        if (divisor < 2) {
            throw new IllegalArgumentException("The divisor must be at least 2");
        }
        iRangeField = rangeField;
        iDurationField = field.getDurationField();
        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) {
        this(dividedField, dividedField.getWrappedField().getDurationField(), type);
    }

    /**
     * Construct a RemainderDateTimeField that compliments the given
     * DividedDateTimeField.
     * This constructor allows the duration field to be set.
     *
     * @param dividedField  complimentary divided field, like "century()".
     * @param durationField  the duration field
     * @param type  the field type this field actually uses
     */
    public RemainderDateTimeField(DividedDateTimeField dividedField, DurationField durationField, DateTimeFieldType type) {
        super(dividedField.getWrappedField(), type);
        iDivisor = dividedField.iDivisor;
        iDurationField = durationField;
        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);
    }

    @Override
    public DurationField getDurationField() {
        return iDurationField;
    }

    /**
     * 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;
        }
    }

}

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