content: /*
   * 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.MutableFloat;
  
  import org.apache.cassandra.cql3.CQL3Type;
  import org.apache.cassandra.cql3.terms.Constants;
  import org.apache.cassandra.cql3.terms.Term;
  import org.apache.cassandra.cql3.functions.ArgumentDeserializer;
  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;
  import org.apache.cassandra.utils.bytecomparable.ByteComparable;
  import org.apache.cassandra.utils.bytecomparable.ByteSource;
  import org.apache.cassandra.utils.bytecomparable.ByteSourceInverse;
  
  
  public class FloatType extends NumberType<Float>
  {
      public static final FloatType instance = new FloatType();
  
      private static final ByteBuffer MASKED_VALUE = instance.decompose(0f);
  
      FloatType() {super(ComparisonType.CUSTOM);} // singleton
  
      @Override
      public boolean allowsEmpty()
      {
          return true;
      }
  
      @Override
      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, 4);
      }
  
      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(Float.parseFloat(source));
        }
        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);
          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.FLOAT;
      }
  
      public TypeSerializer<Float> getSerializer()
      {
          return FloatSerializer.instance;
      }
  
      @Override
      public ArgumentDeserializer getArgumentDeserializer()
      {
          return new NumberArgumentDeserializer<MutableFloat>(new MutableFloat())
          {
              @Override
              protected void setMutableValue(MutableFloat mutable, ByteBuffer buffer)
              {
                  mutable.setValue(ByteBufferUtil.toFloat(buffer));
              }
          };
      }
  
      @Override
      public int valueLengthIfFixed()
      {
          return 4;
      }
  
      @Override
      public ByteBuffer add(Number left, Number right)
      {
          return ByteBufferUtil.bytes(left.floatValue() + right.floatValue());
      }
  
      @Override
      public ByteBuffer substract(Number left, Number right)
      {
          return ByteBufferUtil.bytes(left.floatValue() - right.floatValue());
      }
  
      @Override
      public ByteBuffer multiply(Number left, Number right)
      {
          return ByteBufferUtil.bytes(left.floatValue() * right.floatValue());
      }
  
      @Override
      public ByteBuffer divide(Number left, Number right)
      {
          return ByteBufferUtil.bytes(left.floatValue() / right.floatValue());
      }
  
      @Override
      public ByteBuffer mod(Number left, Number right)
      {
          return ByteBufferUtil.bytes(left.floatValue() % right.floatValue());
      }
  
      @Override
      public ByteBuffer negate(Number input)
      {
          return ByteBufferUtil.bytes(-input.floatValue());
      }
  
      @Override
      public ByteBuffer abs(Number input)
      {
          return ByteBufferUtil.bytes(Math.abs(input.floatValue()));
      }
  
      @Override
      public ByteBuffer exp(Number input)
      {
          return ByteBufferUtil.bytes((float) Math.exp(input.floatValue()));
      }
  
      @Override
      public ByteBuffer log(Number input)
      {
          return ByteBufferUtil.bytes((float) Math.log(input.floatValue()));
      }
  
      @Override
      public ByteBuffer log10(Number input)
      {
          return ByteBufferUtil.bytes((float) Math.log10(input.floatValue()));
      }
  
      @Override
      public ByteBuffer round(Number input)
      {
          return ByteBufferUtil.bytes((float) Math.round(input.floatValue()));
      }
  
      @Override
      public ByteBuffer getMaskedValue()
      {
          return MASKED_VALUE;
      }
  }
  