| 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.convert; |
| 17 | |
| 18 | import org.joda.time.Chronology; |
| 19 | import org.joda.time.DateTimeUtils; |
| 20 | import org.joda.time.Period; |
| 21 | import org.joda.time.ReadWritableInterval; |
| 22 | import org.joda.time.ReadWritablePeriod; |
| 23 | |
| 24 | /** |
| 25 | * NullConverter converts null to an instant, partial, duration, period |
| 26 | * or interval. Null means now for instant/partial, zero for duration/period |
| 27 | * and from now to now for interval. |
| 28 | * |
| 29 | * @author Stephen Colebourne |
| 30 | * @author Brian S O'Neill |
| 31 | * @since 1.0 |
| 32 | */ |
| 33 | class NullConverter extends AbstractConverter |
| 34 | implements InstantConverter, PartialConverter, DurationConverter, PeriodConverter, IntervalConverter { |
| 35 | |
| 36 | /** |
| 37 | * Singleton instance. |
| 38 | */ |
| 39 | static final NullConverter INSTANCE = new NullConverter(); |
| 40 | |
| 41 | /** |
| 42 | * Restricted constructor. |
| 43 | */ |
| 44 | protected NullConverter() { |
| 45 | super(); |
| 46 | } |
| 47 | |
| 48 | //----------------------------------------------------------------------- |
| 49 | /** |
| 50 | * Gets the millisecond duration, which is zero. |
| 51 | * |
| 52 | * @param object the object to convert, which is null |
| 53 | * @return the millisecond duration |
| 54 | */ |
| 55 | public long getDurationMillis(Object object) { |
| 56 | return 0L; |
| 57 | } |
| 58 | |
| 59 | //----------------------------------------------------------------------- |
| 60 | /** |
| 61 | * Sets the given ReadWritableDuration to zero milliseconds. |
| 62 | * |
| 63 | * @param duration duration to get modified |
| 64 | * @param object the object to convert, which is null |
| 65 | * @param chrono the chronology to use |
| 66 | * @throws NullPointerException if the duration is null |
| 67 | */ |
| 68 | public void setInto(ReadWritablePeriod duration, Object object, Chronology chrono) { |
| 69 | duration.setPeriod((Period) null); |
| 70 | } |
| 71 | |
| 72 | //----------------------------------------------------------------------- |
| 73 | /** |
| 74 | * Extracts interval endpoint values from an object of this converter's |
| 75 | * type, and sets them into the given ReadWritableInterval. |
| 76 | * |
| 77 | * @param writableInterval interval to get modified, not null |
| 78 | * @param object the object to convert, which is null |
| 79 | * @param chrono the chronology to use, may be null |
| 80 | * @throws NullPointerException if the interval is null |
| 81 | */ |
| 82 | public void setInto(ReadWritableInterval writableInterval, Object object, Chronology chrono) { |
| 83 | writableInterval.setChronology(chrono); |
| 84 | long now = DateTimeUtils.currentTimeMillis(); |
| 85 | writableInterval.setInterval(now, now); |
| 86 | } |
| 87 | |
| 88 | //----------------------------------------------------------------------- |
| 89 | /** |
| 90 | * Returns null. |
| 91 | * |
| 92 | * @return null |
| 93 | */ |
| 94 | public Class getSupportedType() { |
| 95 | return null; |
| 96 | } |
| 97 | |
| 98 | } |