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SearchEngine.java
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SearchEngine.java
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/*
* Copyright 2019 Google LLC
*
* 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
*
* https://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.google.firebase.ml.md.java.productsearch;
import android.content.Context;
import android.util.Log;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.tasks.Tasks;
import com.google.firebase.ml.md.java.objectdetection.DetectedObject;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/** A fake search engine to help simulate the complete work flow. */
public class SearchEngine {
private static final String TAG = "SearchEngine";
public interface SearchResultListener {
void onSearchCompleted(DetectedObject object, List<Product> productList);
}
private final RequestQueue searchRequestQueue;
private final ExecutorService requestCreationExecutor;
public SearchEngine(Context context) {
searchRequestQueue = Volley.newRequestQueue(context);
requestCreationExecutor = Executors.newSingleThreadExecutor();
}
public void search(DetectedObject object, SearchResultListener listener) {
// Crops the object image out of the full image is expensive, so do it off the UI thread.
Tasks.call(requestCreationExecutor, () -> createRequest(object))
.addOnSuccessListener(productRequest -> searchRequestQueue.add(productRequest.setTag(TAG)))
.addOnFailureListener(
e -> {
Log.e(TAG, "Failed to create product search request!", e);
// Remove the below dummy code after your own product search backed hooked up.
List<Product> productList = new ArrayList<>();
for (int i = 0; i < 8; i++) {
productList.add(
new Product(/* imageUrl= */ "", "Product title " + i, "Product subtitle " + i));
}
listener.onSearchCompleted(object, productList);
});
}
private static JsonObjectRequest createRequest(DetectedObject searchingObject) throws Exception {
byte[] objectImageData = searchingObject.getImageData();
if (objectImageData == null) {
throw new Exception("Failed to get object image data!");
}
// Hooks up with your own product search backend here.
throw new Exception("Hooks up with your own product search backend.");
}
public void shutdown() {
searchRequestQueue.cancelAll(TAG);
requestCreationExecutor.shutdown();
}
}