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TimestampType.java
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TimestampType.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cassandra.db.marshal;
import java.nio.ByteBuffer;
import java.util.Date;
import org.apache.cassandra.cql3.Constants;
import org.apache.cassandra.cql3.Term;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.serializers.TimestampSerializer;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* Type for date-time values.
*
* This is meant as a replacement for DateType, as DateType wrongly compare
* pre-unix-epoch dates, sorting them *after* post-unix-epoch ones (due to it's
* use of unsigned bytes comparison).
*/
public class TimestampType extends AbstractType<Date>
{
private static final Logger logger = LoggerFactory.getLogger(TimestampType.class);
public static final TimestampType instance = new TimestampType();
private TimestampType() {super(ComparisonType.CUSTOM);} // singleton
public boolean isEmptyValueMeaningless()
{
return true;
}
public int compareCustom(ByteBuffer o1, ByteBuffer o2)
{
return LongType.compareLongs(o1, o2);
}
public ByteBuffer fromString(String source) throws MarshalException
{
// Return an empty ByteBuffer for an empty string.
if (source.isEmpty())
return ByteBufferUtil.EMPTY_BYTE_BUFFER;
return ByteBufferUtil.bytes(TimestampSerializer.dateStringToTimestamp(source));
}
public ByteBuffer fromTimeInMillis(long millis) throws MarshalException
{
return ByteBufferUtil.bytes(millis);
}
@Override
public Term fromJSONObject(Object parsed) throws MarshalException
{
if (parsed instanceof Long)
return new Constants.Value(ByteBufferUtil.bytes((Long) parsed));
try
{
return new Constants.Value(TimestampType.instance.fromString((String) parsed));
}
catch (ClassCastException exc)
{
throw new MarshalException(String.format(
"Expected a long or a datestring representation of a timestamp value, but got a %s: %s",
parsed.getClass().getSimpleName(), parsed));
}
}
private String toString(Date date)
{
return date != null ? TimestampSerializer.getJsonDateFormatter().format(date) : "";
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
return '"' + toString(TimestampSerializer.instance.deserialize(buffer)) + '"';
}
@Override
public boolean isCompatibleWith(AbstractType<?> previous)
{
if (super.isCompatibleWith(previous))
return true;
if (previous instanceof DateType)
{
logger.warn("Changing from DateType to TimestampType is allowed, but be wary that they sort differently for pre-unix-epoch timestamps "
+ "(negative timestamp values) and thus this change will corrupt your data if you have such negative timestamp. So unless you "
+ "know that you don't have *any* pre-unix-epoch timestamp you should change back to DateType");
return true;
}
return false;
}
@Override
public boolean isValueCompatibleWithInternal(AbstractType<?> otherType)
{
return this == otherType || otherType == DateType.instance || otherType == LongType.instance;
}
public CQL3Type asCQL3Type()
{
return CQL3Type.Native.TIMESTAMP;
}
public TypeSerializer<Date> getSerializer()
{
return TimestampSerializer.instance;
}
@Override
protected int valueLengthIfFixed()
{
return 8;
}
}