MoodleRestDiscussion.java

package in.co.praveenkumar.mdroid.moodlerest;

import in.co.praveenkumar.mdroid.helper.GsonExclude;
import in.co.praveenkumar.mdroid.model.MoodleDiscussion;

import java.io.Reader;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import android.util.Log;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;

public class MoodleRestDiscussion {
	private final String DEBUG_TAG = "MoodleRestDiscussion";
	private String mUrl;
	private String token;

	public MoodleRestDiscussion(String mUrl, String token) {
		this.mUrl = mUrl;
		this.token = token;
	}

	/**
	 * Get all discussions for the list of forums.
	 * 
	 * @param forumids
	 *            List of forumids
	 * 
	 * @return ArrayList of MoodleDiscussion
	 * 
	 * @author Praveen Kumar Pendyala (praveen@praveenkumar.co.in)
	 */
	public ArrayList<MoodleDiscussion> getDiscussions(List<String> forumids) {
		ArrayList<MoodleDiscussion> mDiscussions = null;
		String format = MoodleRestOption.RESPONSE_FORMAT;
		String function = MoodleRestOption.FUNCTION_GET_DISCUSSIONS;

		try {
			// Adding all parameters.
			String params = "";

			if (forumids == null)
				forumids = new ArrayList<>();

			for (int i = 0; i < forumids.size(); i++)
				params += "&forumids[" + i + "]="
						+ URLEncoder.encode(forumids.get(i), "UTF-8");

			// Build a REST call url to make a call.
			String restUrl = mUrl + "/webservice/rest/server.php" + "?wstoken="
					+ token + "&wsfunction=" + function
					+ "&moodlewsrestformat=" + format;

			// Fetch content now.
			MoodleRestCall mrc = new MoodleRestCall();
			Reader reader = mrc.fetchContent(restUrl, params);
			GsonExclude ex = new GsonExclude();
			Gson gson = new GsonBuilder()
					.addDeserializationExclusionStrategy(ex)
					.addSerializationExclusionStrategy(ex).create();
			mDiscussions = gson.fromJson(reader,
					new TypeToken<List<MoodleDiscussion>>() {
					}.getType());
		} catch (Exception e) {
			Log.d(DEBUG_TAG, "URL encoding failed");
			e.printStackTrace();
		}

		return mDiscussions;
	}

}