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.InputStream;
  import java.io.PrintStream;
  import java.nio.file.Files;
  import java.util.List;
  
  /**
   * Tool implementation for generating Avro JSON schemata from idl format files.
   */
  public class IdlTool 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.size() > (useJavaCC ? 3 : 2)
          || (args.size() == 1 && (args.get(0).equals("--help") || args.get(0).equals("-help")))) {
        err.println("Usage: idl [--useJavaCC] [in [out]]");
        err.println();
        err.println("If an output path is not specified, outputs to stdout.");
        err.println("If no input or output is specified, takes input from");
        err.println("stdin and outputs to stdout.");
        err.println("The special path \"-\" may also be specified to refer to");
        err.println("stdin and stdout.");
        return -1;
      }
  
      String inputName = getArg(args, useJavaCC ? 1 : 0, "-");
      File inputFile = "-".equals(inputName) ? null : new File(inputName);
      String outputName = getArg(args, useJavaCC ? 2 : 1, "-");
      File outputFile = "-".equals(outputName) ? null : new File(outputName);
  
      Schema m = null;
      Protocol p;
      if (useJavaCC) {
        // noinspection deprecation
        try (Idl parser = new Idl(inputFile)) {
          p = parser.CompilationUnit();
          for (String warning : parser.getWarningsAfterParsing()) {
            err.println("Warning: " + warning);
          }
        }
      } 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);
        }
        p = idlFile.getProtocol();
        m = idlFile.getMainSchema();
      }
  
      PrintStream parseOut = out;
      if (outputFile != null) {
        parseOut = new PrintStream(Files.newOutputStream(outputFile.toPath()));
      }
  
      if (m == null && p == null) {
        err.println("Error: the IDL file does not contain a schema nor a protocol.");
        return 1;
      }
      try {
        parseOut.print(m == null ? p.toString(true) : m.toString(true));
      } finally {
        if (parseOut != out) // Close only the newly created FileOutputStream
          parseOut.close();
      }
      return 0;
    }
  
    private String getArg(List<String> args, int index, String defaultValue) {
      if (index < args.size()) {
        return args.get(index);
      } else {
        return defaultValue;
      }
    }
  
    @Override
    public String getName() {
      return "idl";
    }
  
    @Override
    public String getShortDescription() {
      return "Generates a JSON schema or protocol from an Avro IDL file";
    }
  }
  