KwikAPIService.java

package kwik.services;

import java.io.Serializable;
import java.util.List;

import kwik.app.KwikApp;
import kwik.remote.api.AbstractCategory;
import kwik.remote.api.Category;
import kwik.remote.api.Order;
import kwik.remote.api.Product;
import kwik.remote.api.SubCategory;
import kwik.remote.api.User;
import kwik.remote.api.exceptions.APIBadResponseException;
import kwik.remote.api.exceptions.HTTPException;
import kwik.remote.api.exceptions.XMLParseException;
import android.app.IntentService;
import android.content.Intent;
import android.os.Bundle;
import android.os.ResultReceiver;

public class KwikAPIService extends IntentService {
	
	public static final String	GET_CATEGORIES_CMD		= "GetCategories";
	public static final String	GET_SUBCATEGORIES_CMD	= "GetSubCategories";
	public static final String	GET_CAT_PRODUCTS_CMD	= "GetProductsByCategories";
	public static final String	GET_SUBCAT_PRODUCTS_CMD	= "GetProductsBySubCategories";
	public static final String	GET_PRODUCT_CMD			= "GetProductByID";
	public static final String	GET_PRODUCTS_CMD		= "GetProducts";
	public static final String	GET_ORDERS_CMD		    = "GetOrders";
	public static final String	SIGN_IN_CMD				= "UserSignIn";
	
	public static final int		API_BAD_RESPONSE_ERROR	= -1;
	public static final int		STATUS_ERROR			= -2;
	public static final int		STATUS_ILLEGAL_ARGUMENT	= -3;
	public static final int		STATUS_OK				= 0;
	
	/*
	 * Se debe crear un constructor sin parametros y asignarle un nombre al
	 * servicio.
	 */
	public KwikAPIService() {
		super("GetCategoriesService");
	}
	
	/*
	 * Evento que se ejecuta cuando se invocó el servicio por medio de un
	 * Intent.
	 */
	@Override
	protected void onHandleIntent(final Intent intent) {
		final ResultReceiver receiver = intent.getParcelableExtra("receiver");
		final String command = intent.getStringExtra("command");
		final Integer category_id = intent.getIntExtra("category_id", -1);
		final Integer subcategory_id = intent.getIntExtra("subcategory_id", -1);
		final Integer product_id = intent.getIntExtra("product_id", -1);
		final String criteria = intent.getStringExtra("criteria");
		final String username = intent.getStringExtra("username");
		final String password = intent.getStringExtra("password");
		
		final Bundle b = new Bundle();
		try {
			
			if (command.equals(GET_CATEGORIES_CMD)) {
				getCategories(receiver, b);
			} else if (command.equals(GET_SUBCATEGORIES_CMD)) {
				getSubCategories(receiver, b, category_id);
			} else if (command.equals(GET_CAT_PRODUCTS_CMD)) {
				getProductsByCategory(receiver, b, category_id);
			} else if (command.equals(GET_SUBCAT_PRODUCTS_CMD)) {
				getProductsBySubCategory(receiver, b, category_id, subcategory_id);
			} else if (command.equals(GET_PRODUCT_CMD)) {
				getProductByID(receiver, b, product_id);
			} else if (command.equals(GET_PRODUCTS_CMD)) {
				getProducts(receiver, b, criteria);
			} else if (command.equals(SIGN_IN_CMD)) {
				makeLogin(receiver, b, username, password);
			} else if (command.equals(GET_ORDERS_CMD)) {
				getOrders(receiver, b);
			}
		} catch (APIBadResponseException e) {
			b.putSerializable("return", (Serializable) e.error);
			receiver.send(API_BAD_RESPONSE_ERROR, b);
			e.printStackTrace();
		} catch (XMLParseException e) {
			b.putSerializable("return", (Serializable) e.toString());
			receiver.send(STATUS_ILLEGAL_ARGUMENT, b);
			e.printStackTrace();
		} catch (HTTPException e) {
			b.putSerializable("return", (Serializable) e.toString());
			receiver.send(STATUS_ERROR, b);
			e.printStackTrace();
		}
		
		// Es importante terminar el servicio lo antes posible.
		this.stopSelf();
	}
	
	private void getOrders(ResultReceiver receiver, Bundle b) throws APIBadResponseException, XMLParseException, HTTPException {
		User u = ((KwikApp)getApplication()).getCurrentUser();
		List<Order> orders = u.getOrderList();
		
		b.putSerializable("return", (Serializable) orders);
		receiver.send(STATUS_OK, b);
	}

	private void makeLogin(ResultReceiver receiver, Bundle b, String username, String password)
			throws APIBadResponseException, XMLParseException, HTTPException {
		
		User u = null;
		
		u = User.signIn(username, password);
		
		b.putSerializable("return", (Serializable) u);
		receiver.send(STATUS_OK, b);
	}
	
	private void getProducts(ResultReceiver receiver, Bundle b, String criteria) throws APIBadResponseException,
			XMLParseException, HTTPException {
		
		List<Product> p = null;
		
		p = new Product().getProducts("DESC", criteria);
		
		b.putSerializable("return", (Serializable) p);
		receiver.send(STATUS_OK, b);
	}
	
	private void getProductByID(ResultReceiver receiver, Bundle b, int product_id) throws APIBadResponseException,
			XMLParseException, HTTPException {
		
		Product p = null;
		
		p = Product.getProduct(product_id);
		
		b.putSerializable("return", (Serializable) p);
		receiver.send(STATUS_OK, b);
	}
	
	private void getProductsByCategory(ResultReceiver receiver, Bundle b, int category_id)
			throws APIBadResponseException, XMLParseException, HTTPException {
		
		List<Product> products = null;
		
		Category c = new Category();
		c.id = category_id;
		
		products = c.getProducts();
		
		b.putSerializable("return", (Serializable) products);
		receiver.send(STATUS_OK, b);
	}
	
	private void getProductsBySubCategory(ResultReceiver receiver, Bundle b, int category_id, int subcategory_id)
			throws APIBadResponseException, XMLParseException, HTTPException {
		
		List<Product> products = null;
		
		SubCategory c = new SubCategory();
		c.id = subcategory_id;
		c.category_id = category_id;
		
		products = c.getProducts();
		
		b.putSerializable("return", (Serializable) products);
		receiver.send(STATUS_OK, b);
	}
	
	private void getSubCategories(ResultReceiver receiver, Bundle b, int category_id) throws APIBadResponseException,
			XMLParseException, HTTPException {
		
		List<? extends AbstractCategory> subCategories = null;
		
		Category c = new Category();
		c.id = category_id;
		
		subCategories = c.getSubCategoryList();
		
		b.putSerializable("return", (Serializable) subCategories);
		receiver.send(STATUS_OK, b);
	}
	
	private void getCategories(ResultReceiver receiver, Bundle b) throws APIBadResponseException, XMLParseException,
			HTTPException {
		
		List<Category> categories = null;
		
		categories = Category.getCategoryList();
		
		b.putSerializable("return", (Serializable) categories);
		receiver.send(STATUS_OK, b);
	}
	
}