SearchInteractor.java

/*
 * Copyright 2017 Hannes Dorfmann.
 *
 * 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 com.hannesdorfmann.mosby3.sample.mvi.businesslogic.interactor.search;

import com.hannesdorfmann.mosby3.sample.mvi.businesslogic.searchengine.SearchEngine;
import io.reactivex.Observable;

/**
 * Interacts with {@link SearchEngine} to search for items
 *
 * @author Hannes Dorfmann
 */
public class SearchInteractor {
  private final SearchEngine searchEngine;

  public SearchInteractor(SearchEngine searchEngine) {
    this.searchEngine = searchEngine;
  }

  /**
   * Search for items
   */
  public Observable<SearchViewState> search(String searchString) {
    // Empty String, so no search
    if (searchString.isEmpty()) {
      return Observable.just(new SearchViewState.SearchNotStartedYet());
    }

    // search for product
    return searchEngine.searchFor(searchString)
        .map(products -> {
          if (products.isEmpty()) {
            return new SearchViewState.EmptyResult(searchString);
          } else {
            return new SearchViewState.SearchResult(searchString, products);
          }
        })
        .startWith(new SearchViewState.Loading())
        .onErrorReturn(error -> new SearchViewState.Error(searchString, error));
  }
}