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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 com.facebook.presto.jdbc.internal.joda.time.field;

import java.io.Serializable;

import com.facebook.presto.jdbc.internal.joda.time.DurationField;
import com.facebook.presto.jdbc.internal.joda.time.DurationFieldType;

/**
 * Duration field class representing a field with a fixed unit length of one
 * millisecond.
 * 

* MillisDurationField is thread-safe and immutable. * * @author Brian S O'Neill * @since 1.0 */ public final class MillisDurationField extends DurationField implements Serializable { /** Serialization lock. */ private static final long serialVersionUID = 2656707858124633367L; /** Singleton instance. */ public static final DurationField INSTANCE = new MillisDurationField(); /** * Restricted constructor. */ private MillisDurationField() { super(); } //------------------------------------------------------------------------ public DurationFieldType getType() { return DurationFieldType.millis(); } public String getName() { return "millis"; } /** * Returns true as this field is supported. * * @return true always */ public boolean isSupported() { return true; } /** * Returns true as this field is precise. * * @return true always */ public final boolean isPrecise() { return true; } /** * Returns the amount of milliseconds per unit value of this field. * * @return one always */ public final long getUnitMillis() { return 1; } //------------------------------------------------------------------------ public int getValue(long duration) { return FieldUtils.safeToInt(duration); } public long getValueAsLong(long duration) { return duration; } public int getValue(long duration, long instant) { return FieldUtils.safeToInt(duration); } public long getValueAsLong(long duration, long instant) { return duration; } public long getMillis(int value) { return value; } public long getMillis(long value) { return value; } public long getMillis(int value, long instant) { return value; } public long getMillis(long value, long instant) { return value; } public long add(long instant, int value) { return FieldUtils.safeAdd(instant, value); } public long add(long instant, long value) { return FieldUtils.safeAdd(instant, value); } public int getDifference(long minuendInstant, long subtrahendInstant) { return FieldUtils.safeToInt(FieldUtils.safeSubtract(minuendInstant, subtrahendInstant)); } public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { return FieldUtils.safeSubtract(minuendInstant, subtrahendInstant); } //------------------------------------------------------------------------ public int compareTo(DurationField otherField) { long otherMillis = otherField.getUnitMillis(); long thisMillis = getUnitMillis(); // cannot do (thisMillis - otherMillis) as can overflow if (thisMillis == otherMillis) { return 0; } if (thisMillis < otherMillis) { return -1; } else { return 1; } } public boolean equals(Object obj) { if (obj instanceof MillisDurationField) { return getUnitMillis() == ((MillisDurationField) obj).getUnitMillis(); } return false; } public int hashCode() { return (int) getUnitMillis(); } /** * Get a suitable debug string. * * @return debug string */ public String toString() { return "DurationField[millis]"; } /** * Deserialize to the singleton. */ private Object readResolve() { return INSTANCE; } }





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