content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed 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 androidx.test.espresso.web.model;
  
  import static androidx.test.internal.util.Checks.checkNotNull;
  
  import androidx.annotation.Nullable;
  import androidx.test.espresso.remote.annotation.RemoteMsgConstructor;
  import androidx.test.espresso.remote.annotation.RemoteMsgField;
  import java.util.List;
  
  /**
   * Decorates another atom and transforms its output to another type.
   *
   * @param <I> the type of the parent Atom.
   * @param <O> the type of the parent atom after applying a transformation.
   */
  public class TransformingAtom<I, O> implements Atom<O> {
    @RemoteMsgField(order = 0)
    private final Atom<I> parent;
  
    @RemoteMsgField(order = 1)
    private final Transformer<I, O> transformer;
  
    @RemoteMsgConstructor
    public TransformingAtom(Atom<I> parent, Transformer<I, O> transformer) {
      this.parent = checkNotNull(parent);
      this.transformer = checkNotNull(transformer);
    }
  
    @Override
    public String getScript() {
      return parent.getScript();
    }
  
    @Override
    public List<Object> getArguments(@Nullable ElementReference elementContext) {
      return parent.getArguments(elementContext);
    }
  
    @Override
    public O transform(Evaluation eval) {
      return transformer.apply(parent.transform(eval));
    }
  
    /** Converts input to output. */
    public interface Transformer<I, O> {
      public O apply(I input);
    }
  }
  