DoubleType.java
/*
* 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.MutableDouble;
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.TypeSerializer;
import org.apache.cassandra.serializers.DoubleSerializer;
import org.apache.cassandra.serializers.MarshalException;
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.ByteSource;
import org.apache.cassandra.utils.bytecomparable.ByteSourceInverse;
public class DoubleType extends NumberType<Double>
{
public static final DoubleType instance = new DoubleType();
private static final ByteBuffer MASKED_VALUE = instance.decompose(0d);
DoubleType() {super(ComparisonType.CUSTOM);} // singleton
public boolean isEmptyValueMeaningless()
{
return true;
}
@Override
public boolean isFloatingPoint()
{
return true;
}
public <VL, VR> int compareCustom(VL left, ValueAccessor<VL> accessorL, VR right, ValueAccessor<VR> accessorR)
{
return compareComposed(left, accessorL, right, accessorR, this);
}
@Override
public <V> ByteSource asComparableBytes(ValueAccessor<V> accessor, V data, ByteComparable.Version version)
{
return ByteSource.optionalSignedFixedLengthFloat(accessor, data);
}
@Override
public <V> V fromComparableBytes(ValueAccessor<V> accessor, ByteSource.Peekable comparableBytes, ByteComparable.Version version)
{
return ByteSourceInverse.getOptionalSignedFixedLengthFloat(accessor, comparableBytes, 8);
}
public ByteBuffer fromString(String source) throws MarshalException
{
// Return an empty ByteBuffer for an empty string.
if (source.isEmpty())
return ByteBufferUtil.EMPTY_BYTE_BUFFER;
try
{
return decompose(Double.valueOf(source));
}
catch (NumberFormatException e1)
{
throw new MarshalException(String.format("Unable to make double from '%s'", source), e1);
}
}
@Override
public Term fromJSONObject(Object parsed) throws MarshalException
{
try
{
if (parsed instanceof String)
return new Constants.Value(fromString((String) parsed));
else
return new Constants.Value(getSerializer().serialize(((Number) parsed).doubleValue()));
}
catch (ClassCastException exc)
{
throw new MarshalException(String.format(
"Expected a double value, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
}
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
Double value = getSerializer().deserialize(buffer);
if (value == null)
return "\"\"";
// JSON does not support NaN, Infinity and -Infinity values. Most of the parser convert them into null.
if (value.isNaN() || value.isInfinite())
return "null";
return value.toString();
}
public CQL3Type asCQL3Type()
{
return CQL3Type.Native.DOUBLE;
}
public TypeSerializer<Double> getSerializer()
{
return DoubleSerializer.instance;
}
@Override
public ArgumentDeserializer getArgumentDeserializer()
{
return new NumberArgumentDeserializer<MutableDouble>(new MutableDouble())
{
@Override
protected void setMutableValue(MutableDouble mutable, ByteBuffer buffer)
{
mutable.setValue(ByteBufferUtil.toDouble(buffer));
}
};
}
@Override
public int valueLengthIfFixed()
{
return 8;
}
@Override
public ByteBuffer add(Number left, Number right)
{
return ByteBufferUtil.bytes(left.doubleValue() + right.doubleValue());
}
@Override
public ByteBuffer substract(Number left, Number right)
{
return ByteBufferUtil.bytes(left.doubleValue() - right.doubleValue());
}
@Override
public ByteBuffer multiply(Number left, Number right)
{
return ByteBufferUtil.bytes(left.doubleValue() * right.doubleValue());
}
@Override
public ByteBuffer divide(Number left, Number right)
{
return ByteBufferUtil.bytes(left.doubleValue() / right.doubleValue());
}
@Override
public ByteBuffer mod(Number left, Number right)
{
return ByteBufferUtil.bytes(left.doubleValue() % right.doubleValue());
}
@Override
public ByteBuffer negate(Number input)
{
return ByteBufferUtil.bytes(-input.doubleValue());
}
@Override
public ByteBuffer abs(Number input)
{
return ByteBufferUtil.bytes(Math.abs(input.doubleValue()));
}
@Override
public ByteBuffer exp(Number input)
{
return ByteBufferUtil.bytes(Math.exp(input.doubleValue()));
}
@Override
public ByteBuffer log(Number input)
{
return ByteBufferUtil.bytes(Math.log(input.doubleValue()));
}
@Override
public ByteBuffer log10(Number input)
{
return ByteBufferUtil.bytes(Math.log10(input.doubleValue()));
}
@Override
public ByteBuffer round(Number input)
{
return ByteBufferUtil.bytes((double) Math.round(input.doubleValue()));
}
@Override
public ByteBuffer getMaskedValue()
{
return MASKED_VALUE;
}
}