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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.UUID;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.cql3.Constants;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.serializers.UUIDSerializer;
import org.apache.cassandra.utils.TimeUUID;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUIDAsBytes;
// Fully compatible with UUID, and indeed is interpreted as UUID for UDF
public abstract class AbstractTimeUUIDType<T> extends TemporalType<T>
{
AbstractTimeUUIDType()
{
super(ComparisonType.CUSTOM);
} // singleton
public boolean isEmptyValueMeaningless()
{
return true;
}
public <VL, VR> int compareCustom(VL left, ValueAccessor<VL> accessorL, VR right, ValueAccessor<VR> accessorR)
{
// Compare for length
boolean p1 = accessorL.size(left) == 16, p2 = accessorR.size(right) == 16;
if (!(p1 & p2))
{
// should we assert exactly 16 bytes (or 0)? seems prudent
assert p1 || accessorL.isEmpty(left);
assert p2 || accessorR.isEmpty(right);
return p1 ? 1 : p2 ? -1 : 0;
}
long msb1 = accessorL.getLong(left, 0);
long msb2 = accessorR.getLong(right, 0);
msb1 = reorderTimestampBytes(msb1);
msb2 = reorderTimestampBytes(msb2);
assert (msb1 & topbyte(0xf0L)) == topbyte(0x10L);
assert (msb2 & topbyte(0xf0L)) == topbyte(0x10L);
int c = Long.compare(msb1, msb2);
if (c != 0)
return c;
// this has to be a signed per-byte comparison for compatibility
// so we transform the bytes so that a simple long comparison is equivalent
long lsb1 = signedBytesToNativeLong(accessorL.getLong(left, 8));
long lsb2 = signedBytesToNativeLong(accessorR.getLong(right, 8));
return Long.compare(lsb1, lsb2);
}
// takes as input 8 signed bytes in native machine order
// returns the first byte unchanged, and the following 7 bytes converted to an unsigned representation
// which is the same as a 2's complement long in native format
public static long signedBytesToNativeLong(long signedBytes)
{
return signedBytes ^ 0x0080808080808080L;
}
private static long topbyte(long topbyte)
{
return topbyte << 56;
}
protected static long reorderTimestampBytes(long input)
{
return (input << 48)
| ((input << 16) & 0xFFFF00000000L)
| (input >>> 32);
}
public ByteBuffer fromString(String source) throws MarshalException
{
ByteBuffer parsed = UUIDType.parse(source);
if (parsed == null)
throw new MarshalException(String.format("Unknown timeuuid representation: %s", source));
if (parsed.remaining() == 16 && UUIDType.version(parsed) != 1)
throw new MarshalException("TimeUUID supports only version 1 UUIDs");
return parsed;
}
@Override
public Term fromJSONObject(Object parsed) throws MarshalException
{
try
{
return new Constants.Value(fromString((String) parsed));
}
catch (ClassCastException exc)
{
throw new MarshalException(
String.format("Expected a string representation of a timeuuid, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
}
}
public CQL3Type asCQL3Type()
{
return CQL3Type.Native.TIMEUUID;
}
@Override
public ByteBuffer decomposeUntyped(Object value)
{
if (value instanceof UUID)
return UUIDSerializer.instance.serialize((UUID) value);
if (value instanceof TimeUUID)
return TimeUUID.Serializer.instance.serialize((TimeUUID) value);
return super.decomposeUntyped(value);
}
@Override
public int valueLengthIfFixed()
{
return 16;
}
@Override
public long toTimeInMillis(ByteBuffer value)
{
return TimeUUID.deserialize(value).unix(MILLISECONDS);
}
@Override
public ByteBuffer addDuration(ByteBuffer temporal, ByteBuffer duration)
{
throw new UnsupportedOperationException();
}
@Override
public ByteBuffer substractDuration(ByteBuffer temporal, ByteBuffer duration)
{
throw new UnsupportedOperationException();
}
@Override
public ByteBuffer now()
{
return ByteBuffer.wrap(nextTimeUUIDAsBytes());
}
@Override
public boolean equals(Object obj)
{
return obj instanceof AbstractTimeUUIDType<?>;
}
}