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/*
 *  Copyright 2001-2009 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 java.io.Serializable;
import java.util.HashMap;
import java.util.Locale;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeFieldType;
import org.joda.time.DurationField;
import org.joda.time.ReadablePartial;

/**
 * A placeholder implementation to use when a datetime field is not supported.
 * 

* UnsupportedDateTimeField is thread-safe and immutable. * * @author Brian S O'Neill * @since 1.0 */ public final class UnsupportedDateTimeField extends DateTimeField implements Serializable { /** Serialization version */ private static final long serialVersionUID = -1934618396111902255L; /** The cache of unsupported datetime field instances */ private static HashMap cCache; /** * Gets an instance of UnsupportedDateTimeField for a specific named field. * Names should be of standard format, such as 'monthOfYear' or 'hourOfDay'. * The returned instance is cached. * * @param type the type to obtain * @return the instance * @throws IllegalArgumentException if durationField is null */ public static synchronized UnsupportedDateTimeField getInstance( DateTimeFieldType type, DurationField durationField) { UnsupportedDateTimeField field; if (cCache == null) { cCache = new HashMap(7); field = null; } else { field = cCache.get(type); if (field != null && field.getDurationField() != durationField) { field = null; } } if (field == null) { field = new UnsupportedDateTimeField(type, durationField); cCache.put(type, field); } return field; } /** The field type */ private final DateTimeFieldType iType; /** The duration of the datetime field */ private final DurationField iDurationField; /** * Constructor. * * @param type the field type * @param durationField the duration to use */ private UnsupportedDateTimeField(DateTimeFieldType type, DurationField durationField) { if (type == null || durationField == null) { throw new IllegalArgumentException(); } iType = type; iDurationField = durationField; } //----------------------------------------------------------------------- // Design note: Simple accessors return a suitable value, but methods // intended to perform calculations throw an UnsupportedOperationException. public DateTimeFieldType getType() { return iType; } public String getName() { return iType.getName(); } /** * This field is not supported. * * @return false always */ public boolean isSupported() { return false; } /** * This field is not lenient. * * @return false always */ public boolean isLenient() { return false; } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int get(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsText(long instant, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsText(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsText(ReadablePartial partial, int fieldValue, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsText(ReadablePartial partial, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsText(int fieldValue, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsShortText(long instant, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsShortText(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsShortText(ReadablePartial partial, int fieldValue, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsShortText(ReadablePartial partial, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public String getAsShortText(int fieldValue, Locale locale) { throw unsupported(); } /** * Delegates to the duration field. * * @throws UnsupportedOperationException if the duration is unsupported */ public long add(long instant, int value) { return getDurationField().add(instant, value); } /** * Delegates to the duration field. * * @throws UnsupportedOperationException if the duration is unsupported */ public long add(long instant, long value) { return getDurationField().add(instant, value); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int[] add(ReadablePartial instant, int fieldIndex, int[] values, int valueToAdd) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int[] addWrapPartial(ReadablePartial instant, int fieldIndex, int[] values, int valueToAdd) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long addWrapField(long instant, int value) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int[] addWrapField(ReadablePartial instant, int fieldIndex, int[] values, int valueToAdd) { throw unsupported(); } /** * Delegates to the duration field. * * @throws UnsupportedOperationException if the duration is unsupported */ public int getDifference(long minuendInstant, long subtrahendInstant) { return getDurationField().getDifference(minuendInstant, subtrahendInstant); } /** * Delegates to the duration field. * * @throws UnsupportedOperationException if the duration is unsupported */ public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { return getDurationField().getDifferenceAsLong(minuendInstant, subtrahendInstant); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long set(long instant, int value) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int[] set(ReadablePartial instant, int fieldIndex, int[] values, int newValue) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long set(long instant, String text, Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long set(long instant, String text) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int[] set(ReadablePartial instant, int fieldIndex, int[] values, String text, Locale locale) { throw unsupported(); } /** * Even though this DateTimeField is unsupported, the duration field might * be supported. * * @return a possibly supported DurationField */ public DurationField getDurationField() { return iDurationField; } /** * Always returns null. * * @return null always */ public DurationField getRangeDurationField() { return null; } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public boolean isLeap(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getLeapAmount(long instant) { throw unsupported(); } /** * Always returns null. * * @return null always */ public DurationField getLeapDurationField() { return null; } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMinimumValue() { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMinimumValue(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMinimumValue(ReadablePartial instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMinimumValue(ReadablePartial instant, int[] values) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumValue() { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumValue(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumValue(ReadablePartial instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumValue(ReadablePartial instant, int[] values) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumTextLength(Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public int getMaximumShortTextLength(Locale locale) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long roundFloor(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long roundCeiling(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long roundHalfFloor(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long roundHalfCeiling(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long roundHalfEven(long instant) { throw unsupported(); } /** * Always throws UnsupportedOperationException * * @throws UnsupportedOperationException */ public long remainder(long instant) { throw unsupported(); } //------------------------------------------------------------------------ /** * Get a suitable debug string. * * @return debug string */ public String toString() { return "UnsupportedDateTimeField"; } /** * Ensure proper singleton serialization */ private Object readResolve() { return getInstance(iType, iDurationField); } private UnsupportedOperationException unsupported() { return new UnsupportedOperationException(iType + " field is unsupported"); } }





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