Android Open Source - final_app Book Result Info Retriever

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The source code is released under:

CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright 2011 ZXing authors//from  w  ww.  j  av  a 2 s  .c o m
 *
 * 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.google.zxing.client.android.result.supplement;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.content.Context;
import android.widget.TextView;

import com.google.zxing.client.android.HttpHelper;
import com.google.zxing.client.android.LocaleManager;
import com.google.zxing.client.android.R;
import com.google.zxing.client.android.history.HistoryManager;

/**
 * @author Kamil Kaczmarczyk
 * @author Sean Owen
 */
final class BookResultInfoRetriever extends SupplementalInfoRetriever {

  private final String isbn;
  private final String source;
  private final Context context;

  BookResultInfoRetriever(TextView textView, String isbn, HistoryManager historyManager, Context context) {
    super(textView, historyManager);
    this.isbn = isbn;
    this.source = context.getString(R.string.msg_google_books);
    this.context = context;
  }

  @Override
  void retrieveSupplementalInfo() throws IOException {

    CharSequence contents = HttpHelper.downloadViaHttp("https://www.googleapis.com/books/v1/volumes?q=isbn:" + isbn, HttpHelper.ContentType.JSON);

    if (contents.length() == 0) {
      return;
    }

    String title;
    String pages;
    Collection<String> authors = null;

    try {

      JSONObject topLevel = (JSONObject) new JSONTokener(contents.toString()).nextValue();
      JSONArray items = topLevel.optJSONArray("items");
      if (items == null || items.isNull(0)) {
        return;
      }

      JSONObject volumeInfo = ((JSONObject) items.get(0)).getJSONObject("volumeInfo");
      if (volumeInfo == null) {
        return;
      }

      title = volumeInfo.optString("title");
      pages = volumeInfo.optString("pageCount");

      JSONArray authorsArray = volumeInfo.optJSONArray("authors");
      if (authorsArray != null && !authorsArray.isNull(0)) {
        authors = new ArrayList<String>(authorsArray.length());
        for (int i = 0; i < authorsArray.length(); i++) {
          authors.add(authorsArray.getString(i));
        }
      }

    } catch (JSONException e) {
      throw new IOException(e);
    }

    Collection<String> newTexts = new ArrayList<String>();
    maybeAddText(title, newTexts);
    maybeAddTextSeries(authors, newTexts);
    maybeAddText(pages == null || pages.isEmpty() ? null : pages + "pp.", newTexts);

    String baseBookUri = "http://www.google." + LocaleManager.getBookSearchCountryTLD(context) + "/search?tbm=bks&source=zxing&q=";

    append(isbn, source, newTexts.toArray(new String[newTexts.size()]), baseBookUri + isbn);
  }

}

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