// 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.sps;

import com.google.sps.data.ShoppingListTextEntry;
import java.io.IOException;
import java.util.List;

/**
 * This class generates a shopping list based on image 1) It uses cloudVisionAPI to scan an image
 * containing shopping list items and detect text from it. 2) It then uses an algorithm to create
 * shopping sentences (queries) from the text and their position. 3) This list of queries is
 * returned to the Servlet from the method 'imageToShoppingListExtractor'.
 */
public class ImageTextDectector {

  TextDetectionAPI textDetectionAPI;

  public ImageTextDectector(TextDetectionAPI textDetectionAPI) {
    this.textDetectionAPI = textDetectionAPI;
  }

  public String imageToShoppingListExtractor(byte[] shoppingImageBytes)
      throws IOException, PhotoDetectionException {
    List<ShoppingListTextEntry> shoppingListText = textDetectionAPI.detect(shoppingImageBytes);

    return createShoppingListQuery(shoppingListText);
  }

  /** Creates query from the text detected by cloudVision API. */
  private String createShoppingListQuery(List<ShoppingListTextEntry> shoppingListText)
      throws PhotoDetectionException {
    // ToDo: Make an algorithm to create query sentences by separating out text returned by
    // cloudVisionAPI; to group shoppping items based on their position (y axis).
    if (shoppingListText.size() == 0) {
      throw new PhotoDetectionException("Shopping List doesn't contain any text");
    }
    String queryItem = "";
    for(ShoppingListTextEntry singleWord : shoppingListText) {
      queryItem += singleWord.getText()+" ";
    }
    return PhotoShoppingUtil.formatQuery(queryItem);
  }
}

// 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.sps;

import com.google.sps.data.ShoppingListTextEntry;
import java.io.IOException;
import java.util.List;

/**
 * This class generates a shopping list based on image 1) It uses cloudVisionAPI to scan an image
 * containing shopping list items and detect text from it. 2) It then uses an algorithm to create
 * shopping sentences (queries) from the text and their position. 3) This list of queries is
 * returned to the Servlet from the method 'imageToShoppingListExtractor'.
 */
public class ImageTextDectector {

  TextDetectionAPI textDetectionAPI;

  public ImageTextDectector(TextDetectionAPI textDetectionAPI) {
    this.textDetectionAPI = textDetectionAPI;
  }

  public String imageToShoppingListExtractor(byte[] shoppingImageBytes)
      throws IOException, PhotoDetectionException {
    List<ShoppingListTextEntry> shoppingListText = textDetectionAPI.detect(shoppingImageBytes);

    return createShoppingListQuery(shoppingListText);
  }

  /** Creates query from the text detected by cloudVision API. */
  private String createShoppingListQuery(List<ShoppingListTextEntry> shoppingListText)
      throws PhotoDetectionException {
    // ToDo: Make an algorithm to create query sentences by separating out text returned by
    // cloudVisionAPI; to group shoppping items based on their position (y axis).
    if (shoppingListText.size() == 0) {
      throw new PhotoDetectionException("Shopping List doesn't contain any text");
    }
    String queryItem = "";
    for(ShoppingListTextEntry singleWord : shoppingListText) {
      queryItem += singleWord.getText() + " ";
    }
    return PhotoShoppingUtil.formatQuery(queryItem);
  }
}

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