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.runners.samza.translation;
  
  import java.util.Map;
  import java.util.Set;
  import org.apache.beam.runners.samza.SamzaPipelineOptions;
  import org.apache.beam.runners.samza.util.StoreIdGenerator;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.runners.TransformHierarchy;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PValue;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  
  /** Helper that provides context data such as output for config generation. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class ConfigContext {
    private final Map<PValue, String> idMap;
    private AppliedPTransform<?, ?, ?> currentTransform;
    private final SamzaPipelineOptions options;
    private final StoreIdGenerator storeIdGenerator;
  
    public ConfigContext(
        Map<PValue, String> idMap, Set<String> nonUniqueStateIds, SamzaPipelineOptions options) {
      this.idMap = idMap;
      this.options = options;
      this.storeIdGenerator = new StoreIdGenerator(nonUniqueStateIds);
    }
  
    public void setCurrentTransform(AppliedPTransform<?, ?, ?> currentTransform) {
      this.currentTransform = currentTransform;
    }
  
    public void clearCurrentTransform() {
      this.currentTransform = null;
    }
  
    @SuppressWarnings("unchecked")
    public <OutT extends PValue> OutT getOutput(PTransform<?, OutT> transform) {
      return (OutT) Iterables.getOnlyElement(this.currentTransform.getOutputs().values());
    }
  
    public String getOutputId(TransformHierarchy.Node node) {
      return getIdForPValue(Iterables.getOnlyElement(node.getOutputs().values()));
    }
  
    public SamzaPipelineOptions getPipelineOptions() {
      return this.options;
    }
  
    public StoreIdGenerator getStoreIdGenerator() {
      return storeIdGenerator;
    }
  
    private String getIdForPValue(PValue pvalue) {
      final String id = idMap.get(pvalue);
      if (id == null) {
        throw new IllegalArgumentException("No id mapping for value: " + pvalue);
      }
      return id;
    }
  }
  