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 CoordinatorRecordJsonConvertersGenerator implements TypeClassGenerator {
      private final HeaderGenerator headerGenerator;
      private final CodeBuffer buffer;
      private final TreeMap<Short, CoordinatorRecord> records;
  
      private static final class CoordinatorRecord {
          final short id;
          MessageSpec key;
          MessageSpec value;
  
          CoordinatorRecord(short id) {
              this.id = id;
          }
      }
  
      public CoordinatorRecordJsonConvertersGenerator(String packageName) {
          this.headerGenerator = new HeaderGenerator(packageName);
          this.records = new TreeMap<>();
          this.buffer = new CodeBuffer();
      }
  
      @Override
      public String outputName() {
          return MessageGenerator.COORDINATOR_RECORD_JSON_CONVERTERS_JAVA;
      }
  
      @Override
      public void registerMessageType(MessageSpec spec) {
          switch (spec.type()) {
              case COORDINATOR_KEY: {
                  short id = spec.apiKey().get();
                  CoordinatorRecord record = records.computeIfAbsent(id, __ -> new CoordinatorRecord(id));
                  if (record.key != null) {
                      throw new RuntimeException("Duplicate coordinator record key for type " +
                          id + ". Original claimant: " + record.key.name() + ". New " +
                          "claimant: " + spec.name());
                  }
                  record.key = spec;
                  break;
              }
  
              case COORDINATOR_VALUE: {
                  short id = spec.apiKey().get();
                  CoordinatorRecord record = records.computeIfAbsent(id, __ -> new CoordinatorRecord(id));
                  if (record.value != null) {
                      throw new RuntimeException("Duplicate coordinator record value for type " +
                          id + ". Original claimant: " + record.key.name() + ". New " +
                          "claimant: " + spec.name());
                  }
                  record.value = spec;
                  break;
              }
  
              default:
                  // Ignore
          }
      }
  
      @Override
      public void generateAndWrite(BufferedWriter writer) throws IOException {
          buffer.printf("public class CoordinatorRecordJsonConverters {%n");
          buffer.incrementIndent();
          generateWriteKeyJson();
          buffer.printf("%n");
          generateWriteValueJson();
          buffer.printf("%n");
          generateReadKeyFromJson();
          buffer.printf("%n");
          generateReadValueFromJson();
          buffer.printf("%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
          headerGenerator.generate();
  
          headerGenerator.buffer().write(writer);
          buffer.write(writer);
      }
  
      private void generateWriteKeyJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static JsonNode writeRecordKeyAsJson(ApiMessage key) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (key.apiKey()) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().key.name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.write((%s) key, (short) 0);%n", apiMessageClassName, apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + key.apiKey());%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateWriteValueJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static JsonNode writeRecordValueAsJson(ApiMessage value, short version) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (value.apiKey()) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().value.name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.write((%s) value, version);%n", apiMessageClassName, apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + value.apiKey());%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateReadKeyFromJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static ApiMessage readRecordKeyFromJson(JsonNode json, short apiKey) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (apiKey) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().key.name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.read(json, (short) 0);%n", apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + apiKey);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateReadValueFromJson() {
          headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS);
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
  
          buffer.printf("public static ApiMessage readRecordValueFromJson(JsonNode json, short apiKey, short version) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (apiKey) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().value.name());
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %sJsonConverter.read(json, version);%n", apiMessageClassName);
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + apiKey);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  }
  