content: /*
   * Copyright 2013-2025 Real Logic Limited.
   *
   * Licensed 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
   *
   * https://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 uk.co.real_logic.sbe.json;
  
  import org.agrona.DirectBuffer;
  import org.agrona.concurrent.UnsafeBuffer;
  import uk.co.real_logic.sbe.ir.Ir;
  import uk.co.real_logic.sbe.ir.Token;
  import uk.co.real_logic.sbe.otf.OtfHeaderDecoder;
  import uk.co.real_logic.sbe.otf.OtfMessageDecoder;
  
  import java.nio.ByteBuffer;
  import java.util.List;
  
  /**
   * Pretty Print JSON based upon the given Ir.
   */
  public class JsonPrinter
  {
      private final OtfHeaderDecoder headerDecoder;
      private final Ir ir;
  
      /**
       * Create a new JSON printer for a given message Ir.
       *
       * @param ir for the message type.
       */
      public JsonPrinter(final Ir ir)
      {
          this.ir = ir;
          headerDecoder = new OtfHeaderDecoder(ir.headerStructure());
      }
  
      /**
       * Print the encoded message to the output.
       *
       * @param encodedMessage with header in buffer.
       * @param output         to write to.
       */
      public void print(final ByteBuffer encodedMessage, final StringBuilder output)
      {
          final UnsafeBuffer buffer = new UnsafeBuffer(encodedMessage);
          print(output, buffer, 0);
      }
  
      /**
       * Print the encoded message to the output.
       *
       * @param output to write too.
       * @param buffer with encoded message and header.
       * @param offset at which the header begins.
       */
      public void print(final StringBuilder output, final DirectBuffer buffer, final int offset)
      {
          final int blockLength = headerDecoder.getBlockLength(buffer, offset);
          final int templateId = headerDecoder.getTemplateId(buffer, offset);
          final int schemaId = headerDecoder.getSchemaId(buffer, offset);
          final int actingVersion = headerDecoder.getSchemaVersion(buffer, offset);
  
          validateId(schemaId);
  
          final int messageOffset = offset + headerDecoder.encodedLength();
          final List<Token> msgTokens = ir.getMessage(templateId);
  
          OtfMessageDecoder.decode(
              buffer,
              messageOffset,
              actingVersion,
              blockLength,
              msgTokens,
              new JsonTokenListener(output));
      }
  
      /**
       * Print an encoded message to a String.
       *
       * @param encodedMessage with header in buffer.
       * @return encoded message in JSON format.
       */
      public String print(final ByteBuffer encodedMessage)
      {
          final StringBuilder sb = new StringBuilder();
          print(encodedMessage, sb);
  
          return sb.toString();
      }
  
      private void validateId(final int schemaId)
      {
          if (schemaId != ir.id())
          {
              throw new IllegalArgumentException("Required schema id " + ir.id() + " but was " + schemaId);
          }
      }
  }
  