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TIBCO ComputeDB store based off Pivotal GemFireXD
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.cache.query.internal.types;
import java.util.*;
/**
* Comparator for mixed comparisons between instances of
* java.util.Date, java.sql.Date, java.sql.Time, and java.sql.Timestamp.
*
* @version $Revision: 1.1 $
* @author ericz
*/
class TemporalComparator implements Comparator
{
// all temporal comparators are created equal
@Override
public boolean equals(Object obj)
{
return obj instanceof TemporalComparator;
}
// throws ClassCastExcepton if obj1 or obj2 is not a java.util.Date or subclass
public int compare(Object obj1, Object obj2)
{
java.util.Date date1 = (java.util.Date)obj1;
java.util.Date date2 = (java.util.Date)obj2;
long ms1 = date1.getTime();
long ms2 = date2.getTime();
// if we're dealing with Timestamps, then we need to extract milliseconds
// out of the nanos and then do a compare with the "extra" nanos
int extraNanos1 = 0;
int extraNanos2 = 0;
if (date1 instanceof java.sql.Timestamp)
{
int nanos = ((java.sql.Timestamp)date1).getNanos();
int ms = nanos / 1000000;
ms1 += ms;
extraNanos1 = nanos - (ms * 1000000);
}
if (date2 instanceof java.sql.Timestamp)
{
int nanos = ((java.sql.Timestamp)date2).getNanos();
int ms = nanos / 1000000;
ms2 += ms;
extraNanos2 = nanos - (ms * 1000000);
}
if (ms1 != ms2)
return ms1 < ms2 ? -1 : 1;
return extraNanos1 == extraNanos2 ? 0 : (extraNanos1 < extraNanos2 ? -1 : 1);
}
}