runners/google-cloud-dataflow-java/worker/src/test/java/org/apache/beam/runners/dataflow/worker/StepContextStateInternalsFactory.java

/*
 * 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.dataflow.worker;

import org.apache.beam.runners.core.StateInternals;
import org.apache.beam.runners.core.StateInternalsFactory;
import org.apache.beam.runners.core.StepContext;

/**
 * A {@link StateInternalsFactory} that uses the {@link StateInternals} from the provided {@link
 * StepContext}.
 */
class StepContextStateInternalsFactory<K> implements StateInternalsFactory<K> {
  private final StepContext stepContext;

  public StepContextStateInternalsFactory(StepContext stepContext) {
    this.stepContext = stepContext;
  }

  @Override
  @SuppressWarnings("unchecked")
  public StateInternals stateInternalsForKey(K key) {
    return stepContext.stateInternals();
  }
}