| 1 | /* |
| 2 | * Copyright 2001-2005 Stephen Colebourne |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.joda.time.field; |
| 17 | |
| 18 | import org.joda.time.Chronology; |
| 19 | import org.joda.time.DateTimeField; |
| 20 | import org.joda.time.DateTimeFieldType; |
| 21 | import org.joda.time.IllegalFieldValueException; |
| 22 | |
| 23 | /** |
| 24 | * Wraps another field such that a certain value is skipped. |
| 25 | * <p> |
| 26 | * This is most useful for years where you want to skip zero, so the |
| 27 | * sequence runs ...,2,1,-1,-2,... |
| 28 | * <p> |
| 29 | * SkipDateTimeField is thread-safe and immutable. |
| 30 | * |
| 31 | * @author Brian S O'Neill |
| 32 | * @author Stephen Colebourne |
| 33 | * @since 1.0 |
| 34 | */ |
| 35 | public final class SkipDateTimeField extends DelegatedDateTimeField { |
| 36 | |
| 37 | /** Serialization version. */ |
| 38 | private static final long serialVersionUID = -8869148464118507846L; |
| 39 | |
| 40 | /** The chronology to wrap. */ |
| 41 | private final Chronology iChronology; |
| 42 | /** The value to skip. */ |
| 43 | private final int iSkip; |
| 44 | /** The calculated minimum value. */ |
| 45 | private transient int iMinValue; |
| 46 | |
| 47 | /** |
| 48 | * Constructor that skips zero. |
| 49 | * |
| 50 | * @param chronology the chronoogy to use |
| 51 | * @param field the field to skip zero on |
| 52 | */ |
| 53 | public SkipDateTimeField(Chronology chronology, DateTimeField field) { |
| 54 | this(chronology, field, 0); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Constructor. |
| 59 | * |
| 60 | * @param chronology the chronoogy to use |
| 61 | * @param field the field to skip zero on |
| 62 | * @param skip the value to skip |
| 63 | */ |
| 64 | public SkipDateTimeField(Chronology chronology, DateTimeField field, int skip) { |
| 65 | super(field); |
| 66 | iChronology = chronology; |
| 67 | int min = super.getMinimumValue(); |
| 68 | if (min < skip) { |
| 69 | iMinValue = min - 1; |
| 70 | } else if (min == skip) { |
| 71 | iMinValue = skip + 1; |
| 72 | } else { |
| 73 | iMinValue = min; |
| 74 | } |
| 75 | iSkip = skip; |
| 76 | } |
| 77 | |
| 78 | //----------------------------------------------------------------------- |
| 79 | public int get(long millis) { |
| 80 | int value = super.get(millis); |
| 81 | if (value <= iSkip) { |
| 82 | value--; |
| 83 | } |
| 84 | return value; |
| 85 | } |
| 86 | |
| 87 | public long set(long millis, int value) { |
| 88 | FieldUtils.verifyValueBounds(this, value, iMinValue, getMaximumValue()); |
| 89 | if (value <= iSkip) { |
| 90 | if (value == iSkip) { |
| 91 | throw new IllegalFieldValueException |
| 92 | (DateTimeFieldType.year(), new Integer(value), null, null); |
| 93 | } |
| 94 | value++; |
| 95 | } |
| 96 | return super.set(millis, value); |
| 97 | } |
| 98 | |
| 99 | public int getMinimumValue() { |
| 100 | return iMinValue; |
| 101 | } |
| 102 | |
| 103 | private Object readResolve() { |
| 104 | return getType().getField(iChronology); |
| 105 | } |
| 106 | |
| 107 | } |