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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.time.LocalTime;
import java.time.ZoneOffset;
import org.apache.cassandra.cql3.Constants;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
import org.apache.cassandra.serializers.TimeSerializer;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.bytecomparable.ByteComparable;
import org.apache.cassandra.utils.bytecomparable.ByteComparable.Version;
import org.apache.cassandra.utils.bytecomparable.ByteSource;
import org.apache.cassandra.utils.bytecomparable.ByteSourceInverse;
/**
* Nanosecond resolution time values
*/
public class TimeType extends TemporalType
{
public static final TimeType instance = new TimeType();
private static final ArgumentDeserializer ARGUMENT_DESERIALIZER = new DefaultArgumentDeserializer(instance);
private static final ByteBuffer DEFAULT_MASKED_VALUE = instance.decompose(0L);
private TimeType() {super(ComparisonType.BYTE_ORDER);} // singleton
public ByteBuffer fromString(String source) throws MarshalException
{
return decompose(TimeSerializer.timeStringToLong(source));
}
@Override
public ByteSource asComparableBytes(ValueAccessor accessor, V data, Version version)
{
// While BYTE_ORDER would still work for this type, making use of the fixed length is more efficient.
// This type does not allow non-present values, but we do just to avoid future complexity.
return ByteSource.optionalFixedLength(accessor, data);
}
@Override
public V fromComparableBytes(ValueAccessor accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version)
{
return ByteSourceInverse.getOptionalFixedLength(accessor, comparableBytes, 8);
}
@Override
public boolean isValueCompatibleWithInternal(AbstractType otherType)
{
return this == otherType || otherType == LongType.instance;
}
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 time value, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
}
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
return '"' + TimeSerializer.instance.toString(TimeSerializer.instance.deserialize(buffer)) + '"';
}
@Override
public CQL3Type asCQL3Type()
{
return CQL3Type.Native.TIME;
}
@Override
public TypeSerializer getSerializer()
{
return TimeSerializer.instance;
}
@Override
public ArgumentDeserializer getArgumentDeserializer()
{
return ARGUMENT_DESERIALIZER;
}
@Override
public ByteBuffer now()
{
return decompose(LocalTime.now(ZoneOffset.UTC).toNanoOfDay());
}
@Override
public ByteBuffer getMaskedValue()
{
return DEFAULT_MASKED_VALUE;
}
}