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Java example source code file (StrictChronology.java)

This example Java source code file (StrictChronology.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

assembledchronology, chronology, datetimefield, illegalargumentexception, must, strictchronology, string

The StrictChronology.java Java example source code

/*
 *  Copyright 2001-2005 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.chrono;

import org.joda.time.Chronology;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeZone;
import org.joda.time.field.StrictDateTimeField;

/**
 * Wraps another Chronology, ensuring all the fields are strict.
 * <p>
 * StrictChronology is thread-safe and immutable.
 *
 * @author Brian S O'Neill
 * @since 1.0
 * @see StrictDateTimeField
 * @see LenientChronology
 */
public final class StrictChronology extends AssembledChronology {

    /** Serialization lock */
    private static final long serialVersionUID = 6633006628097111960L;

    /**
     * Create a StrictChronology for any chronology.
     *
     * @param base the chronology to wrap
     * @throws IllegalArgumentException if chronology is null
     */
    public static StrictChronology getInstance(Chronology base) {
        if (base == null) {
            throw new IllegalArgumentException("Must supply a chronology");
        }
        return new StrictChronology(base);
    }

    private transient Chronology iWithUTC;

    /**
     * Create a StrictChronology for any chronology.
     *
     * @param base the chronology to wrap
     */
    private StrictChronology(Chronology base) {
        super(base, null);
    }

    public Chronology withUTC() {
        if (iWithUTC == null) {
            if (getZone() == DateTimeZone.UTC) {
                iWithUTC = this;
            } else {
                iWithUTC = StrictChronology.getInstance(getBase().withUTC());
            }
        }
        return iWithUTC;
    }

    public Chronology withZone(DateTimeZone zone) {
        if (zone == null) {
            zone = DateTimeZone.getDefault();
        }
        if (zone == DateTimeZone.UTC) {
            return withUTC();
        }
        if (zone == getZone()) {
            return this;
        }
        return StrictChronology.getInstance(getBase().withZone(zone));
    }

    protected void assemble(Fields fields) {
        fields.year = convertField(fields.year);
        fields.yearOfEra = convertField(fields.yearOfEra);
        fields.yearOfCentury = convertField(fields.yearOfCentury);
        fields.centuryOfEra = convertField(fields.centuryOfEra);
        fields.era = convertField(fields.era);
        fields.dayOfWeek = convertField(fields.dayOfWeek);
        fields.dayOfMonth = convertField(fields.dayOfMonth);
        fields.dayOfYear = convertField(fields.dayOfYear);
        fields.monthOfYear = convertField(fields.monthOfYear);
        fields.weekOfWeekyear = convertField(fields.weekOfWeekyear);
        fields.weekyear = convertField(fields.weekyear);
        fields.weekyearOfCentury = convertField(fields.weekyearOfCentury);

        fields.millisOfSecond = convertField(fields.millisOfSecond);
        fields.millisOfDay = convertField(fields.millisOfDay);
        fields.secondOfMinute = convertField(fields.secondOfMinute);
        fields.secondOfDay = convertField(fields.secondOfDay);
        fields.minuteOfHour = convertField(fields.minuteOfHour);
        fields.minuteOfDay = convertField(fields.minuteOfDay);
        fields.hourOfDay = convertField(fields.hourOfDay);
        fields.hourOfHalfday = convertField(fields.hourOfHalfday);
        fields.clockhourOfDay = convertField(fields.clockhourOfDay);
        fields.clockhourOfHalfday = convertField(fields.clockhourOfHalfday);
        fields.halfdayOfDay = convertField(fields.halfdayOfDay);
    }

    private static final DateTimeField convertField(DateTimeField field) {
        return StrictDateTimeField.getInstance(field);
    }

    //-----------------------------------------------------------------------
    /**
     * A strict chronology is only equal to a strict chronology with the
     * same base chronology.
     * 
     * @param obj  the object to compare to
     * @return true if equal
     * @since 1.4
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof StrictChronology == false) {
            return false;
        }
        StrictChronology chrono = (StrictChronology) obj;
        return getBase().equals(chrono.getBase());
    }

    /**
     * A suitable hashcode for the chronology.
     * 
     * @return the hashcode
     * @since 1.4
     */
    public int hashCode() {
        return 352831696 + getBase().hashCode() * 7;
    }

    /**
     * A debugging string for the chronology.
     * 
     * @return the debugging string
     */
    public String toString() {
        return "StrictChronology[" + getBase().toString() + ']';
    }

}

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