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 test.plugins;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.StandardCharsets;
  import java.util.Map;
  import java.util.stream.Collectors;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.net.URL;
  
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.data.SchemaAndValue;
  import org.apache.kafka.connect.storage.Converter;
  import org.apache.kafka.connect.components.Versioned;
  
  /**
   * Fake plugin class for testing classloading isolation
   * See {@link org.apache.kafka.connect.runtime.isolation.TestPlugins}
   * <p>Load resource(s) from the isolated classloader instance.
   * Exfiltrates data via {@link ReadVersionFromResource#fromConnectData(String, Schema, Object)}
   * and {@link ReadVersionFromResource#toConnectData(String, byte[])}.
   */
  public class ReadVersionFromResource implements Converter, Versioned {
      @Override
      public void configure(final Map<String, ?> configs, final boolean isKey) {
  
      }
  
      private String version(InputStream stream) throws IOException {
          try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
              return reader.lines()
                      .filter(s -> !s.isEmpty() && !s.startsWith("#"))
                      .collect(Collectors.toList())
                      .get(0);
          }
      }
  
      @Override
      public byte[] fromConnectData(final String topic, final Schema schema, final Object value) {
          try (InputStream stream = this.getClass().getResourceAsStream("/version")) {
              return version(stream).getBytes(StandardCharsets.UTF_8);
          } catch (IOException e) {
              throw new AssertionError(e);
          }
      }
  
      @Override
      public SchemaAndValue toConnectData(final String topic, final byte[] value) {
          try {
              Enumeration<URL> e = this.getClass().getClassLoader().getResources("version");
              ArrayList<String> versions = new ArrayList<>();
              while (e.hasMoreElements()) {
                  try (InputStream stream = e.nextElement().openStream()) {
                      versions.add(version(stream));
                  }
              }
              return new SchemaAndValue(null, versions);
          } catch (IOException e) {
              throw new AssertionError(e);
          }
      }
  
      @Override
      public String version() {
          try (InputStream stream = this.getClass().getResourceAsStream("/version")) {
              return version(stream);
          } catch (IOException e) {
              throw new AssertionError(e);
          }
      }
  }