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/*
 *  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;
import org.joda.time.DateTimeFieldType;
import org.joda.time.IllegalFieldValueException;

/**
 * Wraps another field such that a certain value is skipped.
 * 

* This is most useful for years where you want to skip zero, so the * sequence runs ...,2,1,-1,-2,... *

* SkipDateTimeField is thread-safe and immutable. * * @author Brian S O'Neill * @author Stephen Colebourne * @since 1.0 */ public final class SkipDateTimeField extends DelegatedDateTimeField { /** Serialization version. */ private static final long serialVersionUID = -8869148464118507846L; /** 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 skips zero. * * @param chronology the chronology to use * @param field the field to skip zero on */ public SkipDateTimeField(Chronology chronology, DateTimeField field) { this(chronology, field, 0); } /** * Constructor. * * @param chronology the chronology to use * @param field the field to skip zero on * @param skip the value to skip */ public SkipDateTimeField(Chronology chronology, DateTimeField field, int skip) { super(field); iChronology = chronology; int min = super.getMinimumValue(); if (min < skip) { iMinValue = min - 1; } else if (min == skip) { iMinValue = skip + 1; } 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) { if (value == iSkip) { throw new IllegalFieldValueException (DateTimeFieldType.year(), Integer.valueOf(value), null, null); } value++; } return super.set(millis, value); } public int getMinimumValue() { return iMinValue; } private Object readResolve() { return getType().getField(iChronology); } }





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