| 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.DurationField; |
| 19 | import org.joda.time.DurationFieldType; |
| 20 | |
| 21 | /** |
| 22 | * Scales a DurationField such that it's unit millis becomes larger in |
| 23 | * magnitude. |
| 24 | * <p> |
| 25 | * ScaledDurationField is thread-safe and immutable. |
| 26 | * |
| 27 | * @see PreciseDurationField |
| 28 | * |
| 29 | * @author Brian S O'Neill |
| 30 | * @since 1.0 |
| 31 | */ |
| 32 | public class ScaledDurationField extends DecoratedDurationField { |
| 33 | |
| 34 | private static final long serialVersionUID = -3205227092378684157L; |
| 35 | |
| 36 | private final int iScalar; |
| 37 | |
| 38 | /** |
| 39 | * Constructor |
| 40 | * |
| 41 | * @param field the field to wrap, like "year()". |
| 42 | * @param type the type this field will actually use |
| 43 | * @param scalar scalar, such as 100 years in a century |
| 44 | * @throws IllegalArgumentException if scalar is zero or one. |
| 45 | */ |
| 46 | public ScaledDurationField(DurationField field, DurationFieldType type, int scalar) { |
| 47 | super(field, type); |
| 48 | if (scalar == 0 || scalar == 1) { |
| 49 | throw new IllegalArgumentException("The scalar must not be 0 or 1"); |
| 50 | } |
| 51 | iScalar = scalar; |
| 52 | } |
| 53 | |
| 54 | public int getValue(long duration) { |
| 55 | return getWrappedField().getValue(duration) / iScalar; |
| 56 | } |
| 57 | |
| 58 | public long getValueAsLong(long duration) { |
| 59 | return getWrappedField().getValueAsLong(duration) / iScalar; |
| 60 | } |
| 61 | |
| 62 | public int getValue(long duration, long instant) { |
| 63 | return getWrappedField().getValue(duration, instant) / iScalar; |
| 64 | } |
| 65 | |
| 66 | public long getValueAsLong(long duration, long instant) { |
| 67 | return getWrappedField().getValueAsLong(duration, instant) / iScalar; |
| 68 | } |
| 69 | |
| 70 | public long getMillis(int value) { |
| 71 | long scaled = ((long) value) * ((long) iScalar); |
| 72 | return getWrappedField().getMillis(scaled); |
| 73 | } |
| 74 | |
| 75 | public long getMillis(long value) { |
| 76 | long scaled = FieldUtils.safeMultiply(value, iScalar); |
| 77 | return getWrappedField().getMillis(scaled); |
| 78 | } |
| 79 | |
| 80 | public long getMillis(int value, long instant) { |
| 81 | long scaled = ((long) value) * ((long) iScalar); |
| 82 | return getWrappedField().getMillis(scaled, instant); |
| 83 | } |
| 84 | |
| 85 | public long getMillis(long value, long instant) { |
| 86 | long scaled = FieldUtils.safeMultiply(value, iScalar); |
| 87 | return getWrappedField().getMillis(scaled, instant); |
| 88 | } |
| 89 | |
| 90 | public long add(long instant, int value) { |
| 91 | long scaled = ((long) value) * ((long) iScalar); |
| 92 | return getWrappedField().add(instant, scaled); |
| 93 | } |
| 94 | |
| 95 | public long add(long instant, long value) { |
| 96 | long scaled = FieldUtils.safeMultiply(value, iScalar); |
| 97 | return getWrappedField().add(instant, scaled); |
| 98 | } |
| 99 | |
| 100 | public int getDifference(long minuendInstant, long subtrahendInstant) { |
| 101 | return getWrappedField().getDifference(minuendInstant, subtrahendInstant) / iScalar; |
| 102 | } |
| 103 | |
| 104 | public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { |
| 105 | return getWrappedField().getDifferenceAsLong(minuendInstant, subtrahendInstant) / iScalar; |
| 106 | } |
| 107 | |
| 108 | public long getUnitMillis() { |
| 109 | return getWrappedField().getUnitMillis() * iScalar; |
| 110 | } |
| 111 | |
| 112 | //----------------------------------------------------------------------- |
| 113 | /** |
| 114 | * Returns the scalar applied, in the field's units. |
| 115 | * |
| 116 | * @return the scalar |
| 117 | */ |
| 118 | public int getScalar() { |
| 119 | return iScalar; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Compares this duration field to another. |
| 124 | * Two fields are equal if of the same type and duration. |
| 125 | * |
| 126 | * @param obj the object to compare to |
| 127 | * @return if equal |
| 128 | */ |
| 129 | public boolean equals(Object obj) { |
| 130 | if (this == obj) { |
| 131 | return true; |
| 132 | } else if (obj instanceof ScaledDurationField) { |
| 133 | ScaledDurationField other = (ScaledDurationField) obj; |
| 134 | return (getWrappedField().equals(other.getWrappedField())) && |
| 135 | (getType() == other.getType()) && |
| 136 | (iScalar == other.iScalar); |
| 137 | } |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Gets a hash code for this instance. |
| 143 | * |
| 144 | * @return a suitable hashcode |
| 145 | */ |
| 146 | public int hashCode() { |
| 147 | long scalar = iScalar; |
| 148 | int hash = (int) (scalar ^ (scalar >>> 32)); |
| 149 | hash += getType().hashCode(); |
| 150 | hash += getWrappedField().hashCode(); |
| 151 | return hash; |
| 152 | } |
| 153 | |
| 154 | } |