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.kafka.connect.data;
  
  import org.apache.kafka.connect.errors.DataException;
  
  import java.math.BigDecimal;
  import java.math.BigInteger;
  
  /**
   * <p>
   *     An arbitrary-precision signed decimal number. The value is unscaled * 10 ^ -scale where:
   *     <ul>
   *         <li>unscaled is an integer </li>
   *         <li>scale is an integer representing how many digits the decimal point should be shifted on the unscaled value</li>
   *     </ul>
   * </p>
   * <p>
   *     Decimal does not provide a fixed schema because it is parameterized by the scale, which is fixed on the schema
   *     rather than being part of the value.
   * </p>
   * <p>
   *     The underlying representation of this type is bytes containing a two's complement integer
   * </p>
   */
  public class Decimal {
      public static final String LOGICAL_NAME = "org.apache.kafka.connect.data.Decimal";
      public static final String SCALE_FIELD = "scale";
  
      /**
       * Returns a SchemaBuilder for a Decimal with the given scale factor. By returning a SchemaBuilder you can override
       * additional schema settings such as required/optional, default value, and documentation.
       * @param scale the scale factor to apply to unscaled values
       * @return a SchemaBuilder
       */
      public static SchemaBuilder builder(int scale) {
          return SchemaBuilder.bytes()
                  .name(LOGICAL_NAME)
                  .parameter(SCALE_FIELD, Integer.toString(scale))
                  .version(1);
      }
  
      public static Schema schema(int scale) {
          return builder(scale).build();
      }
  
      /**
       * Convert a value from its logical format ({@link BigDecimal}) to its encoded format (byte[]).
       * @param value the logical value
       * @return the encoded value
       */
      public static byte[] fromLogical(Schema schema, BigDecimal value) {
          int schemaScale = scale(schema);
          if (value.scale() != schemaScale)
              throw new DataException(String.format(
                  "Decimal value has mismatching scale for given Decimal schema. "
                      + "Schema has scale %d, value has scale %d.",
                  schemaScale,
                  value.scale()
              ));
          return value.unscaledValue().toByteArray();
      }
  
      /**
       * Convert a value from its encoded format (byte[]) to its logical format ({@link BigDecimal}).
       * @param value the encoded value
       * @return the logical value
       */
      public static BigDecimal toLogical(Schema schema, byte[] value) {
          return new BigDecimal(new BigInteger(value), scale(schema));
      }
  
      private static int scale(Schema schema) {
          String scaleString = schema.parameters().get(SCALE_FIELD);
          if (scaleString == null)
              throw new DataException("Invalid Decimal schema: scale parameter not found.");
          try {
              return Integer.parseInt(scaleString);
          } catch (NumberFormatException e) {
              throw new DataException("Invalid scale parameter found in Decimal schema: ", e);
          }
      }
  }
  