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.Locale;
  import java.util.Map;
  import java.util.TreeMap;
  
  public class CoordinatorRecordTypeGenerator 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 CoordinatorRecordTypeGenerator(String packageName) {
          this.headerGenerator = new HeaderGenerator(packageName);
          this.records = new TreeMap<>();
          this.buffer = new CodeBuffer();
      }
  
      @Override
      public String outputName() {
          return MessageGenerator.COORDINATOR_RECORD_TYPE_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 {
          generate();
          write(writer);
      }
  
      private void generate() {
          buffer.printf("public enum CoordinatorRecordType {%n");
          buffer.incrementIndent();
          generateEnumValues();
          buffer.printf("%n");
          generateInstanceVariables();
          buffer.printf("%n");
          generateEnumConstructor();
          buffer.printf("%n");
          generateFromApiKey();
          buffer.printf("%n");
          generateNewRecordKey();
          buffer.printf("%n");
          generateNewRecordValue();
          buffer.printf("%n");
          generateAccessor("id", "short");
          buffer.printf("%n");
          generateAccessor("lowestSupportedVersion", "short");
          buffer.printf("%n");
          generateAccessor("highestSupportedVersion", "short");
          buffer.printf("%n");
          generateToString();
          buffer.decrementIndent();
          buffer.printf("}%n");
          headerGenerator.generate();
      }
  
      private String cleanName(String name) {
          return name
              .replace("Key", "")
              .replace("Value", "");
      }
  
      private void generateEnumValues() {
          int numProcessed = 0;
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              MessageSpec key = entry.getValue().key;
              if (key == null) {
                  throw new RuntimeException("Coordinator record " + entry.getKey() + " has not key.");
              }
              MessageSpec value = entry.getValue().value;
              if (value == null) {
                  throw new RuntimeException("Coordinator record " + entry.getKey() + " has not key.");
              }
              String name = cleanName(key.name());
              numProcessed++;
              buffer.printf("%s(\"%s\", (short) %d, (short) %d, (short) %d)%s%n",
                  MessageGenerator.toSnakeCase(name).toUpperCase(Locale.ROOT),
                  MessageGenerator.capitalizeFirst(name),
                  entry.getKey(),
                  value.validVersions().lowest(),
                  value.validVersions().highest(),
                  (numProcessed == records.size()) ? ";" : ",");
          }
      }
  
      private void generateInstanceVariables() {
          buffer.printf("private final String name;%n");
          buffer.printf("private final short id;%n");
          buffer.printf("private final short lowestSupportedVersion;%n");
          buffer.printf("private final short highestSupportedVersion;%n");
      }
  
      private void generateEnumConstructor() {
          buffer.printf("CoordinatorRecordType(String name, short id, short lowestSupportedVersion, short highestSupportedVersion) {%n");
          buffer.incrementIndent();
          buffer.printf("this.name = name;%n");
          buffer.printf("this.id = id;%n");
          buffer.printf("this.lowestSupportedVersion = lowestSupportedVersion;%n");
          buffer.printf("this.highestSupportedVersion = highestSupportedVersion;%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateFromApiKey() {
          buffer.printf("public static CoordinatorRecordType fromId(short id) {%n");
          buffer.incrementIndent();
          buffer.printf("switch (id) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return %s;%n", MessageGenerator.
                  toSnakeCase(cleanName(entry.getValue().key.name())).toUpperCase(Locale.ROOT));
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + id);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateNewRecordKey() {
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
          buffer.printf("public ApiMessage newRecordKey() {%n");
          buffer.incrementIndent();
          buffer.printf("switch (id) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return new %s();%n",
                  MessageGenerator.capitalizeFirst(entry.getValue().key.name()));
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + id);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateNewRecordValue() {
          headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS);
          buffer.printf("public ApiMessage newRecordValue() {%n");
          buffer.incrementIndent();
          buffer.printf("switch (id) {%n");
          buffer.incrementIndent();
          for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) {
              buffer.printf("case %d:%n", entry.getKey());
              buffer.incrementIndent();
              buffer.printf("return new %s();%n",
                  MessageGenerator.capitalizeFirst(entry.getValue().value.name()));
              buffer.decrementIndent();
          }
          buffer.printf("default:%n");
          buffer.incrementIndent();
          headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS);
          buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" +
              " + id);%n");
          buffer.decrementIndent();
          buffer.decrementIndent();
          buffer.printf("}%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateAccessor(String name, String type) {
          buffer.printf("public %s %s() {%n", type, name);
          buffer.incrementIndent();
          buffer.printf("return this.%s;%n", name);
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void generateToString() {
          buffer.printf("@Override%n");
          buffer.printf("public String toString() {%n");
          buffer.incrementIndent();
          buffer.printf("return this.name();%n");
          buffer.decrementIndent();
          buffer.printf("}%n");
      }
  
      private void write(BufferedWriter writer) throws IOException {
          headerGenerator.buffer().write(writer);
          buffer.write(writer);
      }
  }
  