fr.free.pierre.reliquet.trackit.utils.InformationFinder.java Source code

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Here is the source code for fr.free.pierre.reliquet.trackit.utils.InformationFinder.java

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/**
 * Copyright 2013 Pierre Reliquet
 *
 * Track-it is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * Track-it is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * Track-it. If not, see <http://www.gnu.org/licenses/>
 */
package fr.free.pierre.reliquet.trackit.utils;

import android.os.AsyncTask;
import android.util.Log;
import android.widget.EditText;
import fr.free.pierre.reliquet.trackit.BuildConfig;
import org.apache.commons.lang.StringEscapeUtils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * @author Pierre Reliquet
 */
public class InformationFinder extends AsyncTask<String, Void, String> {

    private static final String END_PATTERN = "</h3>";
    private static final String END_SUB_PATTERN = "</span>";
    private static final String SEARCH_LINK = "http://www.amazon.";
    private static final String SEARCH_LINK_END = "/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=";
    private static final String START_PATTERN = "<div id=\"result_0\"";
    private static final String START_SUB_PATTERN = "<span class=\"lrg bold\"";
    private static final String SUB_START_SUB_PATTERN = ">";
    private static final Map<String, String> LANGUAGES;

    static {
        LANGUAGES = new HashMap<String, String>();
        LANGUAGES.put("fr", "fr");
        LANGUAGES.put("de", "de");
    }

    private final EditText productTitle;

    public InformationFinder(EditText productTitle) {
        this.productTitle = productTitle;
    }

    private String internalFindTitleFromBarcode(String barcode, String extension) throws Exception {
        URL url = new URL(SEARCH_LINK + extension + SEARCH_LINK_END + barcode);
        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
        StringBuilder result = new StringBuilder();
        String parsing;
        String line = "";
        try {
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            parsing = result.substring(result.indexOf(START_PATTERN) + START_PATTERN.length());
            parsing = parsing.substring(0, parsing.indexOf(END_PATTERN));
            parsing = parsing.substring(parsing.indexOf(START_SUB_PATTERN) + START_SUB_PATTERN.length());
            parsing = parsing.substring(parsing.indexOf(SUB_START_SUB_PATTERN) + SUB_START_SUB_PATTERN.length());
            parsing = parsing.substring(0, parsing.indexOf(END_SUB_PATTERN));
        } catch (Exception e) {
            if (BuildConfig.DEBUG) {
                Log.e("PARSING", "An error occured while searching the information over the internet");
                e.printStackTrace();
            }
            parsing = "";
        } finally {
            in.close();
        }
        return StringEscapeUtils.unescapeHtml(parsing);
    }

    @Override
    protected void onPreExecute() {
        this.productTitle.setEnabled(false);
    }

    @Override
    protected String doInBackground(String... params) {
        String extension = "";
        String locale = Locale.getDefault().getLanguage();
        if (LANGUAGES.containsKey(locale)) {
            extension = LANGUAGES.get(locale);
        } else {
            extension = "com";
        }
        String result = "";
        try {
            result = this.internalFindTitleFromBarcode(params[0], extension);
        } catch (Exception e) {
            result = "";
        }
        return result;
    }

    @Override
    protected void onPostExecute(String result) {
        this.productTitle.setText(result);
        this.productTitle.setEnabled(true);
    }
}