001: /*
002: * Copyright 2001-2006 Stephen Colebourne
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016: package org.joda.time.convert;
017:
018: import org.joda.time.Chronology;
019: import org.joda.time.DateTimeUtils;
020: import org.joda.time.DateTimeZone;
021: import org.joda.time.ReadablePartial;
022:
023: /**
024: * ReadablePartialConverter extracts partial fields and chronology from a ReadablePartial.
025: *
026: * @author Stephen Colebourne
027: * @since 1.0
028: */
029: class ReadablePartialConverter extends AbstractConverter implements
030: PartialConverter {
031:
032: /**
033: * Singleton instance.
034: */
035: static final ReadablePartialConverter INSTANCE = new ReadablePartialConverter();
036:
037: /**
038: * Restricted constructor.
039: */
040: protected ReadablePartialConverter() {
041: super ();
042: }
043:
044: //-----------------------------------------------------------------------
045: /**
046: * Gets the chronology, which is taken from the ReadablePartial.
047: *
048: * @param object the ReadablePartial to convert, must not be null
049: * @param zone the specified zone to use, null means default zone
050: * @return the chronology, never null
051: */
052: public Chronology getChronology(Object object, DateTimeZone zone) {
053: return getChronology(object, (Chronology) null).withZone(zone);
054: }
055:
056: /**
057: * Gets the chronology, which is taken from the ReadableInstant.
058: * <p>
059: * If the passed in chronology is non-null, it is used.
060: * Otherwise the chronology from the instant is used.
061: *
062: * @param object the ReadablePartial to convert, must not be null
063: * @param chrono the chronology to use, null means use that from object
064: * @return the chronology, never null
065: */
066: public Chronology getChronology(Object object, Chronology chrono) {
067: if (chrono == null) {
068: chrono = ((ReadablePartial) object).getChronology();
069: chrono = DateTimeUtils.getChronology(chrono);
070: }
071: return chrono;
072: }
073:
074: /**
075: * Extracts the values of the partial from an object of this converter's type.
076: * The chrono parameter is a hint to the converter, should it require a
077: * chronology to aid in conversion.
078: *
079: * @param fieldSource a partial that provides access to the fields.
080: * This partial may be incomplete and only getFieldType(int) should be used
081: * @param object the object to convert
082: * @param chrono the chronology to use, which is the non-null result of getChronology()
083: * @return the array of field values that match the fieldSource, must be non-null valid
084: * @throws ClassCastException if the object is invalid
085: */
086: public int[] getPartialValues(ReadablePartial fieldSource,
087: Object object, Chronology chrono) {
088: ReadablePartial input = (ReadablePartial) object;
089: int size = fieldSource.size();
090: int[] values = new int[size];
091: for (int i = 0; i < size; i++) {
092: values[i] = input.get(fieldSource.getFieldType(i));
093: }
094: chrono.validate(fieldSource, values);
095: return values;
096: }
097:
098: //-----------------------------------------------------------------------
099: /**
100: * Returns ReadableInstant.class.
101: *
102: * @return ReadableInstant.class
103: */
104: public Class getSupportedType() {
105: return ReadablePartial.class;
106: }
107:
108: }
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