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Java example source code file (

This example Java source code file ( is included in the "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

chronology, delegateddatetimefield, lenientdatetimefield, strictdatetimefield

The Java example source code

 *  Copyright 2001-2007 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
 *  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.Chronology;
import org.joda.time.DateTimeField;

 * Converts a strict DateTimeField into a lenient one. By being lenient, the
 * set method accepts out of bounds values, performing an addition instead.
 * <p>
 * LenientDateTimeField is thread-safe and immutable.
 * @author Brian S O'Neill
 * @see org.joda.time.chrono.LenientChronology
 * @see StrictDateTimeField
 * @since 1.0
public class LenientDateTimeField extends DelegatedDateTimeField {

    private static final long serialVersionUID = 8714085824173290599L;

    private final Chronology iBase;

     * Returns a lenient version of the given field. If it is already lenient,
     * then it is returned as-is. Otherwise, a new LenientDateTimeField is
     * returned.
    public static DateTimeField getInstance(DateTimeField field, Chronology base) {
        if (field == null) {
            return null;
        if (field instanceof StrictDateTimeField) {
            field = ((StrictDateTimeField)field).getWrappedField();
        if (field.isLenient()) {
            return field;
        return new LenientDateTimeField(field, base);

    protected LenientDateTimeField(DateTimeField field, Chronology base) {
        iBase = base;

    public final boolean isLenient() {
        return true;

     * Set values which may be out of bounds by adding the difference between
     * the new value and the current value.
    public long set(long instant, int value) {
        // lenient needs to handle time zone chronologies
        // so we do the calculation using local milliseconds
        long localInstant = iBase.getZone().convertUTCToLocal(instant);
        long difference = FieldUtils.safeSubtract(value, get(instant));
        localInstant = getType().getField(iBase.withUTC()).add(localInstant, difference);
        return iBase.getZone().convertLocalToUTC(localInstant, false, instant);

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