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
   *
   *     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 org.apache.avro.tool;
  
  import org.apache.avro.Protocol;
  import org.apache.avro.Schema;
  import org.apache.avro.compiler.idl.Idl;
  import org.apache.avro.idl.IdlFile;
  import org.apache.avro.idl.IdlReader;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.InputStream;
  import java.io.PrintStream;
  import java.util.List;
  
  /**
   * Extract the Avro JSON schemata of the types of a protocol defined through an
   * idl format file.
   */
  public class IdlToSchemataTool implements Tool {
    @Override
    public int run(InputStream in, PrintStream out, PrintStream err, List<String> args) throws Exception {
      boolean useJavaCC = "--useJavaCC".equals(getArg(args, 0, null));
  
      if (args.isEmpty() || args.size() > (useJavaCC ? 3 : 2) || isRequestingHelp(args)) {
        err.println("Usage: idl2schemata [--useJavaCC] [idl [outdir]]");
        err.println();
        err.println("If an output directory is not specified, " + "outputs to current directory.");
        return -1;
      }
  
      String inputName = getArg(args, useJavaCC ? 1 : 0, "-");
      File inputFile = "-".equals(inputName) ? null : new File(inputName);
      File outputDirectory = getOutputDirectory(getArg(args, useJavaCC ? 2 : 1, ""));
  
      if (useJavaCC) {
        try (Idl parser = new Idl(inputFile)) {
          final Protocol protocol = parser.CompilationUnit();
          final List<String> warnings = parser.getWarningsAfterParsing();
          for (String warning : warnings) {
            err.println("Warning: " + warning);
          }
          for (Schema schema : protocol.getTypes()) {
            print(schema, outputDirectory);
          }
        }
      } else {
        IdlReader parser = new IdlReader();
        IdlFile idlFile = inputFile == null ? parser.parse(in) : parser.parse(inputFile.toPath());
        for (String warning : idlFile.getWarnings()) {
          err.println("Warning: " + warning);
        }
        for (Schema schema : idlFile.getNamedSchemas().values()) {
          print(schema, outputDirectory);
        }
      }
  
      return 0;
    }
  
    private boolean isRequestingHelp(List<String> args) {
      return args.size() == 1 && (args.get(0).equals("--help") || args.get(0).equals("-help"));
    }
  
    private String getArg(List<String> args, int index, String defaultValue) {
      if (index < args.size()) {
        return args.get(index);
      } else {
        return defaultValue;
      }
    }
  
    private File getOutputDirectory(String dirname) {
      File outputDirectory = new File(dirname);
      outputDirectory.mkdirs();
      return outputDirectory;
    }
  
    private void print(Schema schema, File outputDirectory) throws FileNotFoundException {
      String dirpath = outputDirectory.getAbsolutePath();
      String filename = dirpath + "/" + schema.getName() + ".avsc";
      FileOutputStream fileOutputStream = new FileOutputStream(filename);
      PrintStream printStream = new PrintStream(fileOutputStream);
      printStream.println(schema.toString(true));
      printStream.close();
    }
  
    @Override
    public String getName() {
      return "idl2schemata";
    }
  
    @Override
    public String getShortDescription() {
      return "Extract JSON schemata of the types from an Avro IDL file";
    }
  }
  