eu.smartfp7.facebook.FacebookUtil.java Source code

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Here is the source code for eu.smartfp7.facebook.FacebookUtil.java

Source

package eu.smartfp7.facebook;

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

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import eu.smartfp7.foursquare.utils.Utils;

/**
 * [Copyright and License]
 */

/**
 * A class containing utility functions related to the Facebook Graph API.
 * 
 * @author Romain Deveaud <romain.deveaud at glasgow.ac.uk>
 *
 */
public class FacebookUtil {

    /**
     * Given the ID of a page, returns the JSON containing the complete information.
     */
    public static String getFacebookPageById(String id) throws IOException {
        return Utils.makeAPICall("http://graph.facebook.com/" + id);
    }

    /**
     * Given a JsonObject coming from a Facebook API call, returns a Collection of
     * FacebookPage objects.
     */
    public static Collection<FacebookPage> getFacebookPagesFromJSON(JsonObject jsonObj) {
        Collection<FacebookPage> return_coll = new ArrayList<FacebookPage>();

        for (JsonElement e : jsonObj.get("data").getAsJsonArray())
            return_coll.add(new FacebookPage(e.toString()));

        return return_coll;
    }

    /**
     * Given a user ID and an access token allowing listing his/her likes, returns
     * a list of FacebookPage objects (which only contain IDs, categories and names).
     */
    public static Collection<FacebookPage> getFacebookLikesByUserId(String user_id, String access_token)
            throws IOException {
        final String apiUrl = "https://graph.facebook.com/v2.8/" + user_id + "/likes?"
                + "fields=category,category_list,website,about,were_here_count,name,talking_about_count,username,company_overview,location,fan_count"
                + "&limit=100&access_token=" + access_token;
        System.err.println("Accessing fb graph api at " + apiUrl);
        JsonObject jsonObj = new JsonParser().parse(Utils.makeAPICall(apiUrl)).getAsJsonObject();
        try {
            return getFacebookPagesFromJSON(jsonObj);
        } catch (Exception e) {
            System.err.println(e + " Could not find desired items likes->data->[array] from JSON:");
            e.printStackTrace();
            System.err.println(jsonObj.toString());
            return new ArrayList<>();
        }
    }
}