Java tutorial
/* * Copyright (c) 2014. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License for Helena Local Inc. All rights reseved. */ package org.montanafoodhub.base.get; import android.content.Context; import android.text.TextUtils; import android.util.Log; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.montanafoodhub.base.Hub; import org.montanafoodhub.base.HubInit; import org.montanafoodhub.base.Order; import java.io.*; import java.net.UnknownHostException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Iterator; import java.util.List; /** * Created by abbie on 1/24/14. */ public class OrderHub extends Hub implements Runnable { private static boolean isFirstLoad = true; private static Context context; private static Calendar lastRefreshTS; private String fileName = "HL-OrderHub.csv"; private SimpleDateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy"); public OrderHub(Context context) { this.context = context; } private void parseCSV(List<Order> myOrderArr, InputStream inputStream) throws IOException, ParseException { InputStreamReader inputStreamReader = new InputStreamReader(inputStream); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); TextUtils.SimpleStringSplitter simpleStringSplitter = new TextUtils.SimpleStringSplitter(','); String receiveString = ""; boolean firstTime = true; while ((receiveString = bufferedReader.readLine()) != null) { if (firstTime) { // remove header firstTime = false; } else { // build Order Order order = new Order(); simpleStringSplitter.setString(receiveString); Iterator<String> iterator = simpleStringSplitter.iterator(); // Date OID (Order ID) IID (Item ID) PID (Producer ID) BID (Buyer ID) Buyer Url if (iterator.hasNext()) { String date = iterator.next(); if (!date.equals("")) { order.getDate().setTime(dateFormat.parse(date)); } } if (iterator.hasNext()) { String orderId = iterator.next(); if (!orderId.equals("")) { order.setOrderID(orderId); } } if (iterator.hasNext()) { String itemId = iterator.next(); if (!itemId.equals("")) { order.setItemID(itemId); } } if (iterator.hasNext()) { String producerId = iterator.next(); if (!producerId.equals("")) { order.setProducerID(producerId); } } if (iterator.hasNext()) { String buyerId = iterator.next(); if (!buyerId.equals("")) { order.setBuyerID(buyerId); } } if (iterator.hasNext()) { String buyerUrl = iterator.next(); if (!buyerUrl.equals("")) { order.setBuyerUrl(buyerUrl); } } myOrderArr.add(order); } } } protected List<Order> readFromFile(Context context) { List<Order> myOrderArr = new ArrayList<Order>(); try { // getItem the time the file was last changed here File myFile = new File(context.getFilesDir() + "/" + fileName); SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss"); String lastRefreshTSStr = sdf.format(myFile.lastModified()); Log.w(HubInit.logTag, "Using file (" + fileName + ") last modified on : " + lastRefreshTSStr); lastRefreshTS = sdf.getCalendar(); // create products from the file here InputStream inputStream = context.openFileInput(fileName); if (inputStream != null) { parseCSV(myOrderArr, inputStream); } inputStream.close(); } catch (FileNotFoundException e) { Log.e(HubInit.logTag, "File (" + fileName + ") not found: " + e.toString()); } catch (IOException e) { Log.e(HubInit.logTag, "Can not read file (" + fileName + ") : " + e.toString()); } catch (ParseException pe) { Log.e(HubInit.logTag, "Can't parse Order date (" + fileName + ") : " + pe.toString()); } Log.w(HubInit.logTag, "Number of orders loaded: " + myOrderArr.size()); return myOrderArr; } public List<Order> getOrderArr() throws IOException { List<Order> out = new ArrayList<Order>(); try { if (isFirstLoad) { // try to load disk file first. out = readFromFile(context); } else { out = loadFromServer(context); } } catch (IOException ie) { Log.w(logTag, "OrderHub().getOrderArr couldn't be loaded..."); } finally { isFirstLoad = false; } return out; } protected List<Order> loadFromServer(Context context) throws IOException { HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(orderHubDataUrl); try { // first try the net HttpResponse response = client.execute(request); Log.w(HubInit.logTag, "HTTP execute Response.getStatusLine() = " + response.getStatusLine()); // make net version local BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent())); writeToFile(context, rd, fileName); Log.w(HubInit.logTag, "Wrote file from the net to device..."); } catch (UnknownHostException e) { Log.w(HubInit.logTag, "Couldn't getItem the file from the net just using file from device... "); } // regardless of net work with file return readFromFile(context); } public static List<Order> getOrdersForBuyer(String buyerId) { List<Order> buyerOrder = new ArrayList<Order>(); // load relevant for (Order order : Hub.orderArr) { if (order.getBuyerID().equalsIgnoreCase(buyerId)) { buyerOrder.add(order); } } return buyerOrder; } public static Calendar getLastRefreshTS() { return lastRefreshTS; } @Override public void run() { try { Hub.orderArr = new OrderHub(context).getOrderArr(); broadcastRefresh(context, HubType.ORDER_HUB); Log.w(logTag, "OrderHub().getOrderMap loaded..."); } catch (IOException e) { Log.w(logTag, "OrderHub().getOrderMap couldn't be loaded..."); } } @Override public void refresh() { try { Hub.orderArr = loadFromServer(context); broadcastRefresh(context, HubType.ORDER_HUB); Log.w(logTag, "OrderHub().refresh loaded..."); } catch (IOException e) { Log.w(logTag, "OrderHub().refresh couldn't be loaded..."); } } }