org.apache.cassandra.db.marshal.FloatType Maven / Gradle / Ivy
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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,
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* See the License for the specific language governing permissions and
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*/
package org.apache.cassandra.db.marshal;
import java.nio.ByteBuffer;
import org.apache.cassandra.cql3.CQL3Type;
import org.apache.cassandra.cql3.Constants;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.serializers.TypeSerializer;
import org.apache.cassandra.serializers.FloatSerializer;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.transport.ProtocolVersion;
import org.apache.cassandra.utils.ByteBufferUtil;
public class FloatType extends AbstractType
{
public static final FloatType instance = new FloatType();
FloatType() {super(ComparisonType.CUSTOM);} // singleton
public boolean isEmptyValueMeaningless()
{
return true;
}
public int compareCustom(ByteBuffer o1, ByteBuffer o2)
{
if (!o1.hasRemaining() || !o2.hasRemaining())
return o1.hasRemaining() ? 1 : o2.hasRemaining() ? -1 : 0;
return compose(o1).compareTo(compose(o2));
}
public ByteBuffer fromString(String source) throws MarshalException
{
// Return an empty ByteBuffer for an empty string.
if (source.isEmpty())
return ByteBufferUtil.EMPTY_BYTE_BUFFER;
try
{
float f = Float.parseFloat(source);
return ByteBufferUtil.bytes(f);
}
catch (NumberFormatException e1)
{
throw new MarshalException(String.format("Unable to make float 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).floatValue()));
}
catch (ClassCastException exc)
{
throw new MarshalException(String.format(
"Expected a float value, but got a %s: %s", parsed.getClass().getSimpleName(), parsed));
}
}
@Override
public String toJSONString(ByteBuffer buffer, ProtocolVersion protocolVersion)
{
Float value = getSerializer().deserialize(buffer);
// 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.FLOAT;
}
public TypeSerializer getSerializer()
{
return FloatSerializer.instance;
}
@Override
protected int valueLengthIfFixed()
{
return 4;
}
}