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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 org.apache.commons.lang3.mutable.MutableByte;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.cql3.Constants;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
import org.apache.cassandra.serializers.ByteSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
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;
public class ByteType extends NumberType
{
public static final ByteType instance = new ByteType();
private static final ByteBuffer MASKED_VALUE = instance.decompose((byte) 0);
ByteType()
{
super(ComparisonType.CUSTOM);
} // singleton
public int compareCustom(VL left, ValueAccessor accessorL, VR right, ValueAccessor accessorR)
{
return accessorL.getByte(left, 0) - accessorR.getByte(right, 0);
}
@Override
public ByteSource asComparableBytes(ValueAccessor accessor, V data, Version version)
{
// This type does not allow non-present values, but we do just to avoid future complexity.
return ByteSource.optionalSignedFixedLengthNumber(accessor, data);
}
@Override
public V fromComparableBytes(ValueAccessor accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version)
{
return ByteSourceInverse.getOptionalSignedFixedLength(accessor, comparableBytes, 1);
}
public ByteBuffer fromString(String source) throws MarshalException
{
// Return an empty ByteBuffer for an empty string.
if (source.isEmpty())
return ByteBufferUtil.EMPTY_BYTE_BUFFER;
byte b;
try
{
b = Byte.parseByte(source);
}
catch (Exception e)
{
throw new MarshalException(String.format("Unable to make byte from '%s'", source), e);
}
return decompose(b);
}
public Term fromJSONObject(Object parsed) throws MarshalException
{
if (parsed instanceof String || parsed instanceof Number)
return new Constants.Value(fromString(String.valueOf(parsed)));
throw new MarshalException(String.format(
"Expected a byte value, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
return getSerializer().deserialize(buffer).toString();
}
@Override
public CQL3Type asCQL3Type()
{
return CQL3Type.Native.TINYINT;
}
@Override
public TypeSerializer getSerializer()
{
return ByteSerializer.instance;
}
@Override
public ArgumentDeserializer getArgumentDeserializer()
{
return new NumberArgumentDeserializer(new MutableByte())
{
@Override
protected void setMutableValue(MutableByte mutable, ByteBuffer buffer)
{
mutable.setValue(ByteBufferUtil.toByte(buffer));
}
};
}
@Override
public ByteBuffer add(Number left, Number right)
{
return ByteBufferUtil.bytes((byte) (left.byteValue() + right.byteValue()));
}
@Override
public ByteBuffer substract(Number left, Number right)
{
return ByteBufferUtil.bytes((byte) (left.byteValue() - right.byteValue()));
}
@Override
public ByteBuffer multiply(Number left, Number right)
{
return ByteBufferUtil.bytes((byte) (left.byteValue() * right.byteValue()));
}
@Override
public ByteBuffer divide(Number left, Number right)
{
return ByteBufferUtil.bytes((byte) (left.byteValue() / right.byteValue()));
}
@Override
public ByteBuffer mod(Number left, Number right)
{
return ByteBufferUtil.bytes((byte) (left.byteValue() % right.byteValue()));
}
public ByteBuffer negate(Number input)
{
return ByteBufferUtil.bytes((byte) -input.byteValue());
}
@Override
public ByteBuffer abs(Number input)
{
return ByteBufferUtil.bytes((byte) Math.abs(input.byteValue()));
}
@Override
public ByteBuffer exp(Number input)
{
return ByteBufferUtil.bytes((byte) Math.exp(input.byteValue()));
}
@Override
public ByteBuffer log(Number input)
{
return ByteBufferUtil.bytes((byte) Math.log(input.byteValue()));
}
@Override
public ByteBuffer log10(Number input)
{
return ByteBufferUtil.bytes((byte) Math.log10(input.byteValue()));
}
@Override
public ByteBuffer round(Number input)
{
return decompose(input.byteValue());
}
@Override
public ByteBuffer getMaskedValue()
{
return MASKED_VALUE;
}
}