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 com.fasterxml.jackson.annotation.JsonIgnore;
  import io.github.classgraph.ClassGraph;
  import org.apache.beam.sdk.options.Default;
  import org.apache.beam.sdk.options.DefaultValueFactory;
  import org.apache.beam.sdk.options.Description;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.util.InstanceBuilder;
  
  /** Pipeline options dedicated to detecting classpath resources. */
  public interface PipelineResourcesOptions extends PipelineOptions {
  
    /**
     * The class of the pipeline resources detector factory that should be created and used to create
     * the detector. If not set explicitly, a default class will be used to instantiate the factory.
     */
    @JsonIgnore
    @Description(
        "The class of the pipeline resources detector factory that should be created and used to create "
            + "the detector. If not set explicitly, a default class will be used to instantiate the factory.")
    @Default.Class(ClasspathScanningResourcesDetectorFactory.class)
    Class<? extends PipelineResourcesDetector.Factory> getPipelineResourcesDetectorFactoryClass();
  
    void setPipelineResourcesDetectorFactoryClass(
        Class<? extends PipelineResourcesDetector.Factory> factoryClass);
  
    /**
     * Instance of a pipeline resources detection algorithm. If not set explicitly, a default
     * implementation will be used.
     */
    @JsonIgnore
    @Description(
        "Instance of a pipeline resources detection algorithm. If not set explicitly, a default implementation will be used")
    @Default.InstanceFactory(PipelineResourcesDetectorFactory.class)
    PipelineResourcesDetector getPipelineResourcesDetector();
  
    void setPipelineResourcesDetector(PipelineResourcesDetector pipelineResourcesDetector);
  
    /**
     * Creates {@link PipelineResourcesDetector} instance based on provided pipeline options or
     * default values set for them.
     */
    class PipelineResourcesDetectorFactory implements DefaultValueFactory<PipelineResourcesDetector> {
  
      @Override
      public PipelineResourcesDetector create(PipelineOptions options) {
        PipelineResourcesOptions resourcesOptions = options.as(PipelineResourcesOptions.class);
  
        PipelineResourcesDetector.Factory resourcesToStage =
            InstanceBuilder.ofType(PipelineResourcesDetector.Factory.class)
                .fromClass(resourcesOptions.getPipelineResourcesDetectorFactoryClass())
                .fromFactoryMethod("create")
                .build();
  
        return resourcesToStage.getPipelineResourcesDetector();
      }
    }
  
    /** Constructs the default {@link PipelineResourcesDetector} instance. */
    class ClasspathScanningResourcesDetectorFactory implements PipelineResourcesDetector.Factory {
  
      public static ClasspathScanningResourcesDetectorFactory create() {
        return new ClasspathScanningResourcesDetectorFactory();
      }
  
      @Override
      public PipelineResourcesDetector getPipelineResourcesDetector() {
        return new ClasspathScanningResourcesDetector(new ClassGraph());
      }
    }
  }
  