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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 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.reflect;
Utility to induce a schema from a class or a protocol from an interface.
public class InduceSchemaTool implements Tool {
  public int run(InputStream inPrintStream outPrintStream err,
      List<Stringargsthrows Exception {
    if (args.size() == 0 || args.size() > 2) {
      ..println("Usage: [colon-delimited-classpath] classname");
      return 1;
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    String className;
    if (args.size() == 2) {
      String classpaths = args.get(0);
      className = args.get(1);
      if (!classpaths.isEmpty()) {
        String[] paths = args.get(0).split(":");
        URL[] urls = new URL[paths.length];
        for (int i = 0; i < paths.length; ++i) {
          urls[i] = new File(paths[i]).toURI().toURL();
        classLoader = URLClassLoader.newInstance(urlsclassLoader);
    } else {
      className = args.get(0);
    Class<?> klass = classLoader.loadClass(className);
    if (klass.isInterface()) {
    } else {
    return 0;
  public String getName() {
    return "induce";
  public String getShortDescription() {
    return "Induce schema/protocol from Java class/interface via reflection.";
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