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/*
 *  Copyright 2001-2005 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.DurationFieldType;

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

* PreciseDurationField is thread-safe and immutable. * * @author Stephen Colebourne * @author Brian S O'Neill * @since 1.0 */ public class PreciseDurationField extends BaseDurationField { private static final long serialVersionUID = -8346152187724495365L; /** The size of the unit */ private final long iUnitMillis; /** * Constructor. * * @param type the field type * @param unitMillis the unit milliseconds */ public PreciseDurationField(DurationFieldType type, long unitMillis) { super(type); iUnitMillis = unitMillis; } //------------------------------------------------------------------------ /** * 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 the unit size of this field, in milliseconds */ public final long getUnitMillis() { return iUnitMillis; } //------------------------------------------------------------------------ /** * Get the value of this field from the milliseconds. * * @param duration the milliseconds to query, which may be negative * @param instant ignored * @return the value of the field, in the units of the field, which may be * negative */ public long getValueAsLong(long duration, long instant) { return duration / iUnitMillis; // safe } /** * Get the millisecond duration of this field from its value. * * @param value the value of the field, which may be negative * @param instant ignored * @return the milliseconds that the field represents, which may be * negative */ public long getMillis(int value, long instant) { return value * iUnitMillis; // safe } /** * Get the millisecond duration of this field from its value. * * @param value the value of the field, which may be negative * @param instant ignored * @return the milliseconds that the field represents, which may be * negative */ public long getMillis(long value, long instant) { return FieldUtils.safeMultiply(value, iUnitMillis); } public long add(long instant, int value) { long addition = value * iUnitMillis; // safe return FieldUtils.safeAdd(instant, addition); } public long add(long instant, long value) { long addition = FieldUtils.safeMultiply(value, iUnitMillis); return FieldUtils.safeAdd(instant, addition); } public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) { long difference = FieldUtils.safeSubtract(minuendInstant, subtrahendInstant); return difference / iUnitMillis; } //----------------------------------------------------------------------- /** * Compares this duration field to another. * Two fields are equal if of the same type and duration. * * @param obj the object to compare to * @return if equal */ public boolean equals(Object obj) { if (this == obj) { return true; } else if (obj instanceof PreciseDurationField) { PreciseDurationField other = (PreciseDurationField) obj; return (getType() == other.getType()) && (iUnitMillis == other.iUnitMillis); } return false; } /** * Gets a hash code for this instance. * * @return a suitable hashcode */ public int hashCode() { long millis = iUnitMillis; int hash = (int) (millis ^ (millis >>> 32)); hash += getType().hashCode(); return hash; } }





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