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Java example source code file (SkipUndoDateTimeField.java)

This example Java source code file (SkipUndoDateTimeField.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

chronology, datetimefield, delegateddatetimefield, object, skipundodatetimefield

The SkipUndoDateTimeField.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.field;

import org.joda.time.Chronology;
import org.joda.time.DateTimeField;

/**
 * Wraps another field such that a certain value is added back into
 * the sequence of numbers.
 * <p>
 * This reverses the effect of SkipDateTimeField. This isn't very
 * elegant.
 * <p>
 * SkipUndoDateTimeField is thread-safe and immutable.
 *
 * @author Brian S O'Neill
 * @author Stephen Colebourne
 * @since 1.0
 */
public final class SkipUndoDateTimeField extends DelegatedDateTimeField {

    /** Serialization version. */
    private static final long serialVersionUID = -5875876968979L;

    /** The chronology to wrap. */
    private final Chronology iChronology;
    /** The value to skip. */
    private final int iSkip;
    /** The calculated minimum value. */
    private transient int iMinValue;

    /**
     * Constructor that reinserts zero.
     * 
     * @param chronology  the chronoogy to use
     * @param field  the field to skip zero on
     */
    public SkipUndoDateTimeField(Chronology chronology, DateTimeField field) {
        this(chronology, field, 0);
    }

    /**
     * Constructor.
     * 
     * @param chronology  the chronoogy to use
     * @param field  the field to skip zero on
     * @param skip  the value to skip
     */
    public SkipUndoDateTimeField(Chronology chronology, DateTimeField field, int skip) {
        super(field);
        iChronology = chronology;
        int min = super.getMinimumValue();
        if (min < skip) {
            iMinValue = min + 1;
        } else if (min == skip + 1) {
            iMinValue = skip;
        } else {
            iMinValue = min;
        }
        iSkip = skip;
    }

    //-----------------------------------------------------------------------
    public int get(long millis) {
        int value = super.get(millis);
        if (value < iSkip) {
            value++;
        }
        return value;
    }

    public long set(long millis, int value) {
        FieldUtils.verifyValueBounds(this, value, iMinValue, getMaximumValue());
        if (value <= iSkip) {
            value--;
        }
        return super.set(millis, value);
    }

    public int getMinimumValue() {
        return iMinValue;
    }

    private Object readResolve() {
        return getType().getField(iChronology);
    }

}

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