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   *  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
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
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  package org.apache.cayenne.crypto.transformer.value;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  import java.util.Arrays;
  
  /**
   * Converts between {@link java.math.BigDecimal} and byte[]
   *
   * @since 4.0
   */
  public class BigDecimalConverter implements BytesConverter<BigDecimal> {
  
      public static final BytesConverter<BigDecimal> INSTANCE = new BigDecimalConverter();
  
      private static final int INTEGER_BYTES = Integer.SIZE / Byte.SIZE;
      private static final int MIN_BYTES = INTEGER_BYTES + 1;
  
      static BigDecimal getBigDecimal(byte[] bytes) {
  
          byte[] unscaledBytes, scaleBytes;
  
          if (bytes.length < MIN_BYTES) {
              throw new IllegalArgumentException("byte[] is too small for a BigDecimal value: " + bytes.length);
          }
  
          scaleBytes = Arrays.copyOfRange(bytes, 0, INTEGER_BYTES);
          unscaledBytes = Arrays.copyOfRange(bytes, INTEGER_BYTES, bytes.length);
  
          return new BigDecimal(new BigInteger(unscaledBytes), IntegerConverter.getInt(scaleBytes));
      }
  
      static byte[] getBytes(BigDecimal bigDecimal) {
  
          byte[] result, unscaledBytes, scaleBytes;
  
          unscaledBytes = bigDecimal.unscaledValue().toByteArray();
          scaleBytes = IntegerConverter.getBytes(bigDecimal.scale());
  
          result = new byte[INTEGER_BYTES + unscaledBytes.length];
          System.arraycopy(scaleBytes, 0, result, INTEGER_BYTES - scaleBytes.length, scaleBytes.length);
          System.arraycopy(unscaledBytes, 0, result, INTEGER_BYTES, unscaledBytes.length);
  
          return result;
      }
  
      @Override
      public BigDecimal fromBytes(byte[] bytes) {
          return getBigDecimal(bytes);
      }
  
      @Override
      public byte[] toBytes(BigDecimal value) {
          return getBytes(value);
      }
  }
  