SearchDrinksTask.java

package com.markupartist.iglaset.activity;

import java.util.ArrayList;

import android.os.AsyncTask;
import android.util.Log;

import com.markupartist.iglaset.provider.BarcodeStore;
import com.markupartist.iglaset.provider.Drink;
import com.markupartist.iglaset.provider.DrinksStore;
import com.markupartist.iglaset.provider.RatingSearchCriteria;
import com.markupartist.iglaset.provider.RecommendationSearchCriteria;
import com.markupartist.iglaset.provider.SearchCriteria;

/**
 * Background task to search for drinks.
 */
public class SearchDrinksTask extends AsyncTask<SearchCriteria, Void, ArrayList<Drink>> {

	private final static String TAG = SearchDrinksTask.class.getSimpleName();
    private SearchDrinkProgressUpdatedListener mSearchDrinkProgressUpdatedListener;
    private SearchDrinkCompletedListener mSearchDrinkCompletedListener;
    private SearchDrinkErrorListener mSearchDrinkErrorListener;
    private Exception mCaughtException;

    @Override
    protected ArrayList<Drink> doInBackground(SearchCriteria... params) {
        publishProgress();
        SearchCriteria searchCriteria = params[0];
        try {
            if (searchCriteria.hasBarcode()) {
                BarcodeStore barcodeStore = BarcodeStore.getInstance();
                return barcodeStore.search(searchCriteria);
            } else if (searchCriteria instanceof RecommendationSearchCriteria) {
                DrinksStore drinksStore = DrinksStore.getInstance();
                return drinksStore.findRecommendations(
                        (RecommendationSearchCriteria) searchCriteria);
            } else if (searchCriteria instanceof RatingSearchCriteria) {
                DrinksStore drinksStore = DrinksStore.getInstance();
                return drinksStore.findRatedDrinks(
                        (RatingSearchCriteria) searchCriteria);
            } else {
                DrinksStore drinksStore = DrinksStore.getInstance();
                return drinksStore.searchDrinks(searchCriteria);
            }
        } catch (Exception e) {
            mCaughtException = e;
            Log.d(TAG, e.toString(), e);
        }
        return null;
    }

    @Override
    public void onProgressUpdate(Void... values) {
        if (mSearchDrinkProgressUpdatedListener != null) {
            mSearchDrinkProgressUpdatedListener.onSearchDrinkProgress();
        }
    }

    @Override
    protected void onPostExecute(ArrayList<Drink> result) {
        if (mCaughtException == null) {
            mSearchDrinkCompletedListener.onSearchDrinkComplete(result);
        } else {
            mSearchDrinkErrorListener.onSearchDrinkError(mCaughtException);
        }
    }

    /**
     * Set a listener for progress updated.
     * @param listener the listener to set
     */
    public void setSearchDrinkProgressUpdatedListener(
            SearchDrinkProgressUpdatedListener listener) {
        mSearchDrinkProgressUpdatedListener = listener;
    }

    /**
     * Set a listener for search completed.
     * @param listener the listener to set
     */
    public void setSearchDrinkCompletedListener(
            SearchDrinkCompletedListener listener) {
        mSearchDrinkCompletedListener = listener;
    }

    /**
     * Set listener for errors
     * @param listener the listener to set
     */
    public void setSearchDrinkErrorListener(SearchDrinkErrorListener listener) {
        mSearchDrinkErrorListener = listener;
    }

    /**
     * Listener for search progress updated.
     */
    public interface SearchDrinkProgressUpdatedListener {
        /**
         * Called when search progress is made.
         */
        public void onSearchDrinkProgress();
    }

    /**
     * Listener for search completed.
     */
    public interface SearchDrinkCompletedListener {
        /**
         * Called when search is completed.
         * @param result the search result
         */
        public void onSearchDrinkComplete(ArrayList<Drink> result);
    }

    /**
     * Listener for search completed.
     */
    public interface SearchDrinkErrorListener {
        /**
         * Called when a search error has occurred.
         * @param exception exception caught
         */
        public void onSearchDrinkError(Exception exception);
    }
}