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/*
 *  Copyright 2001-2007 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 com.facebook.presto.jdbc.internal.joda.time.field;

import com.facebook.presto.jdbc.internal.joda.time.Chronology;
import com.facebook.presto.jdbc.internal.joda.time.DateTimeField;

/**
 * Converts a strict DateTimeField into a lenient one. By being lenient, the
 * set method accepts out of bounds values, performing an addition instead.
 * 

* LenientDateTimeField is thread-safe and immutable. * * @author Brian S O'Neill * @see com.facebook.presto.jdbc.internal.joda.time.chrono.LenientChronology * @see StrictDateTimeField * @since 1.0 */ public class LenientDateTimeField extends DelegatedDateTimeField { private static final long serialVersionUID = 8714085824173290599L; private final Chronology iBase; /** * Returns a lenient version of the given field. If it is already lenient, * then it is returned as-is. Otherwise, a new LenientDateTimeField is * returned. */ public static DateTimeField getInstance(DateTimeField field, Chronology base) { if (field == null) { return null; } if (field instanceof StrictDateTimeField) { field = ((StrictDateTimeField)field).getWrappedField(); } if (field.isLenient()) { return field; } return new LenientDateTimeField(field, base); } protected LenientDateTimeField(DateTimeField field, Chronology base) { super(field); iBase = base; } public final boolean isLenient() { return true; } /** * Set values which may be out of bounds by adding the difference between * the new value and the current value. */ public long set(long instant, int value) { // lenient needs to handle time zone chronologies // so we do the calculation using local milliseconds long localInstant = iBase.getZone().convertUTCToLocal(instant); long difference = FieldUtils.safeSubtract(value, get(instant)); localInstant = getType().getField(iBase.withUTC()).add(localInstant, difference); return iBase.getZone().convertLocalToUTC(localInstant, false, instant); } }





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