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.serializers;
  
  import org.apache.cassandra.db.marshal.ValueAccessor;
  import org.apache.cassandra.utils.ByteBufferUtil;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  import java.nio.ByteBuffer;
  
  public class DecimalSerializer extends TypeSerializer<BigDecimal>
  {
      public static final DecimalSerializer instance = new DecimalSerializer();
  
      public <V> BigDecimal deserialize(V value, ValueAccessor<V> accessor)
      {
          if (value == null || accessor.isEmpty(value))
              return null;
  
          // do not consume the contents of the ByteBuffer
          int scale = accessor.getInt(value, 0);
          BigInteger bi = new BigInteger(accessor.toArray(value, 4, accessor.size(value) - 4));
          return new BigDecimal(bi, scale);
      }
  
      public ByteBuffer serialize(BigDecimal value)
      {
          if (value == null)
              return ByteBufferUtil.EMPTY_BYTE_BUFFER;
  
          BigInteger bi = value.unscaledValue();
          int scale = value.scale();
          byte[] bibytes = bi.toByteArray();
  
          ByteBuffer bytes = ByteBuffer.allocate(4 + bibytes.length);
          bytes.putInt(scale);
          bytes.put(bibytes);
          bytes.rewind();
          return bytes;
      }
  
      public <T> void validate(T value, ValueAccessor<T> accessor) throws MarshalException
      {
          // We at least store the scale.
          if (!accessor.isEmpty(value) && accessor.size(value) < 4)
              throw new MarshalException(String.format("Expected 0 or at least 4 bytes (%d)", accessor.size(value)));
      }
  
      public String toString(BigDecimal value)
      {
          return value == null ? "" : value.toString();
      }
  
      public Class<BigDecimal> getType()
      {
          return BigDecimal.class;
      }
  }
  