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Java example source code file (NullConverter.java)

This example Java source code file (NullConverter.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

abstractconverter, chronology, class, durationconverter, instance, instantconverter, intervalconverter, nullconverter, object, partialconverter, periodconverter

The NullConverter.java Java example source code

/*
 *  Copyright 2001-2009 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.convert;

import org.joda.time.Chronology;
import org.joda.time.DateTimeUtils;
import org.joda.time.Period;
import org.joda.time.ReadWritableInterval;
import org.joda.time.ReadWritablePeriod;

/**
 * NullConverter converts null to an instant, partial, duration, period
 * or interval. Null means now for instant/partial, zero for duration/period
 * and from now to now for interval.
 *
 * @author Stephen Colebourne
 * @author Brian S O'Neill
 * @since 1.0
 */
class NullConverter extends AbstractConverter
        implements InstantConverter, PartialConverter, DurationConverter, PeriodConverter, IntervalConverter {

    /**
     * Singleton instance.
     */
    static final NullConverter INSTANCE = new NullConverter();

    /**
     * Restricted constructor.
     */
    protected NullConverter() {
        super();
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the millisecond duration, which is zero.
     * 
     * @param object  the object to convert, which is null
     * @return the millisecond duration
     */
    public long getDurationMillis(Object object) {
        return 0L;
    }

    //-----------------------------------------------------------------------
    /**
     * Sets the given ReadWritableDuration to zero milliseconds.
     *
     * @param duration duration to get modified
     * @param object  the object to convert, which is null
     * @param chrono  the chronology to use
     * @throws NullPointerException if the duration is null
     */
    public void setInto(ReadWritablePeriod duration, Object object, Chronology chrono) {
        duration.setPeriod((Period) null);
    }

    //-----------------------------------------------------------------------
    /**
     * Extracts interval endpoint values from an object of this converter's
     * type, and sets them into the given ReadWritableInterval.
     *
     * @param writableInterval interval to get modified, not null
     * @param object  the object to convert, which is null
     * @param chrono  the chronology to use, may be null
     * @throws NullPointerException if the interval is null
     */
    public void setInto(ReadWritableInterval writableInterval, Object object, Chronology chrono) {
        writableInterval.setChronology(chrono);
        long now = DateTimeUtils.currentTimeMillis();
        writableInterval.setInterval(now, now);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns null.
     * 
     * @return null
     */
    public Class<?> getSupportedType() {
        return null;
    }

}

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