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.message;
  
  import java.io.BufferedWriter;
  import java.io.IOException;
  import java.util.Map;
  import java.util.TreeMap;
  
  public class MetadataJsonConvertersGenerator implements TypeClassGenerator {
      private final HeaderGenerator headerGenerator;
      private final CodeBuffer buffer;
      private final TreeMap<Short, MessageSpec> apis;
  
      public MetadataJsonConvertersGenerator(String packageName) {
          this.headerGenerator = new HeaderGenerator(packageName);
          this.apis = new TreeMap<>();
          this.buffer = new CodeBuffer();
      }
  
      @Override
      public String outputName() {
          return MessageGenerator.METADATA_JSON_CONVERTERS_JAVA;
      }
  
      @Override
      public void registerMessageType(MessageSpec spec) {
          if (spec.type() == MessageSpecType.METADATA) {
              short id = spec.apiKey().get();
              MessageSpec prevSpec = apis.put(id, spec);
              if (prevSpec != null) {
                  throw new RuntimeException("Duplicate metadata record entry for type " +
                          id + ". Original claimant: " + prevSpec.name() + ". New " +
                          "claimant: " + spec.name());
              }
          }
      }
  
      @Override
      public void generateAndWrite(BufferedWriter writer) throws IOException {
          buffer.printf("public class MetadataJsonConverters {%n");
          buffer.incrementIndent();
          generateWriteJson();
          buffer.printf("%n");
          generateReadJson();
          buffer.printf("%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
          headerGenerator.generate();
  
          headerGenerator.buffer().write(writer);
          buffer.write(writer);
      }
  
      private void generateWriteJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static JsonNode writeJson(ApiMessage apiMessage, short apiVersion) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (apiMessage.apiKey()) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, MessageSpec> entry : apis.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.write((%s) apiMessage, apiVersion);%n", apiMessageClassName, apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown metadata id \"" +
                  " + apiMessage.apiKey());%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateReadJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static ApiMessage readJson(JsonNode json, short apiKey, short apiVersion) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (apiKey) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, MessageSpec> entry : apis.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.read(json, apiVersion);%n", apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown metadata id \"" +
                  " + apiKey);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  }
  