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.direct;
  
  import java.util.Objects;
  import org.apache.beam.runners.local.StructuralKey;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.MoreObjects;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * A (Step, Key) pair. This is useful as a map key or cache key for things that are available
   * per-step in a keyed manner (e.g. State).
   */
  final class StepAndKey {
    private final AppliedPTransform<?, ?, ?> step;
    private final StructuralKey<?> key;
  
    /** Create a new {@link StepAndKey} with the provided step and key. */
    public static StepAndKey of(AppliedPTransform<?, ?, ?> step, StructuralKey<?> key) {
      return new StepAndKey(step, key);
    }
  
    private StepAndKey(AppliedPTransform<?, ?, ?> step, StructuralKey<?> key) {
      this.step = step;
      this.key = key;
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(StepAndKey.class)
          .add("step", step.getFullName())
          .add("key", key.getKey())
          .toString();
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(step, key);
    }
  
    @Override
    public boolean equals(@Nullable Object other) {
      if (other == this) {
        return true;
      } else if (!(other instanceof StepAndKey)) {
        return false;
      } else {
        StepAndKey that = (StepAndKey) other;
        return Objects.equals(this.step, that.step) && Objects.equals(this.key, that.key);
      }
    }
  }
  