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.beam.sdk.util.construction.resources;
  
  import io.github.classgraph.ClassGraph;
  import java.io.File;
  import java.util.List;
  import java.util.stream.Collectors;
  
  /**
   * Attempts to detect all the resources to be staged using classgraph library.
   *
   * <p>See <a
   * href="https://github.com/classgraph/classgraph">https://github.com/classgraph/classgraph</a>
   */
  public class ClasspathScanningResourcesDetector implements PipelineResourcesDetector {
  
    private transient ClassGraph classGraph;
  
    public ClasspathScanningResourcesDetector(ClassGraph classGraph) {
      this.classGraph = classGraph;
    }
  
    /**
     * Detects classpath resources and returns a list of absolute paths to them.
     *
     * @param classLoader The classloader to use to detect resources to stage (optional).
     * @return A list of absolute paths to the resources the class loader uses.
     */
    @Override
    public List<String> detect(ClassLoader classLoader) {
      List<File> classpathContents =
          classGraph
              .disableNestedJarScanning()
              .addClassLoader(classLoader)
              .scan(1)
              .getClasspathFiles();
  
      return classpathContents.stream().map(File::getAbsolutePath).collect(Collectors.toList());
    }
  }
  