/*
* 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 com.google.common.base.Preconditions.checkNotNull;
import androidx.test.espresso.remote.annotation.RemoteMsgConstructor;
import androidx.test.espresso.remote.annotation.RemoteMsgField;
import java.util.List;
import javax.annotation.Nullable;
/**
* 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);
}
}