Initial commit

build.xml, etc. are modified a bit after opening in Netbeans 7.4.

1 files changed, 124 insertions, 0 deletions

diff --git a/src/Chapter2/Location/LocationTranslationExample.java b/src/Chapter2/Location/LocationTranslationExample.java
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+/* TweetTracker. Copyright (c) Arizona Board of Regents on behalf of Arizona State University
+ * @author shamanth
+ */
+package Chapter2.Location;
+
+import Chapter2.support.Location;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.json.JSONArray;
+import org.json.JSONException;
+
+public class LocationTranslationExample
+{
+
+      /**
+        * Translates a location string to coordinates using the database or Nominatim Service
+        * @param loc
+        * @return
+        */
+   public Location TranslateLoc(String loc)
+   {
+        if(loc!=null&&!loc.isEmpty())
+        {
+            String encodedLoc="";
+            try {
+                //Step 1: Encode the location name
+                 encodedLoc = URLEncoder.encode(loc, "UTF-8");
+            } catch (UnsupportedEncodingException ex) {
+                Logger.getLogger(LocationTranslationExample.class.getName()).log(Level.SEVERE, null, ex);
+            }
+             //Step 2: Create a get request to MapQuest API with the name of the location
+            String url= "http://open.mapquestapi.com/nominatim/v1/search?q="+encodedLoc+"&format=json";
+            String page = ReadHTML(url);
+            if(page!=null)
+            {
+                try{
+                    JSONArray results = new JSONArray(page);
+                   if(results.length()>0)
+                    {
+                       //Step 3: Read and extract the coordinates of the location as a JSONObject
+                        Location loca = new Location(results.getJSONObject(0).getDouble("lat"),results.getJSONObject(0).getDouble("lon"));
+                        return loca;
+                    }
+                }catch(JSONException ex)
+                {
+                    Logger.getLogger(LocationTranslationExample.class.getName()).log(Level.SEVERE, null, ex);
+                }
+            }
+        }
+        return null;
+  }
+
+    /**
+     * Extracts the html content of a URL
+     * @param url
+     * @return html page
+     */
+    public String ReadHTML(String url)
+    {
+        URLConnection conn = null;
+        URL theURL = null;
+        try
+        {
+                theURL = new URL(url);
+        }
+        catch ( MalformedURLException e)
+        {
+                System.out.println("Bad URL: " + theURL);
+                return null;
+        }
+        String page = "";
+        try
+        {
+            conn = theURL.openConnection();
+            HttpURLConnection huc = (HttpURLConnection) conn;
+            conn.setConnectTimeout(2000);
+            huc.setRequestProperty("User-Agent", "Mozilla/4.5");
+            //Set your email address in the request so MapQuest knows how to reach you in the event of problems
+            huc.setRequestProperty("Email", "twitterdataanalytics@gmail.com");
+            if(huc.getResponseCode()>=400&&huc.getResponseCode()<=404)
+            {
+                 return null;
+            }
+            conn.connect();
+            BufferedReader bRead = new BufferedReader(new InputStreamReader((InputStream) conn.getContent()));
+            String temp=null;
+             while( (temp= bRead.readLine())!=null)
+              {
+                  page = page+"\n"+temp;
+              }
+              bRead.close();
+        }
+        catch (IOException e) {
+                //System.out.print("ReadHTML IO Error:" + e.getMessage()+" \n");
+                return null;
+        }
+	return page;
+    }
+
+    public static void main(String[] args)
+    {
+        LocationTranslationExample lte = new LocationTranslationExample();
+        if(args!=null)
+        {
+            if(args.length>0)
+            {
+                for(int i=0;i<args.length;i++)
+                {
+                    System.out.println(lte.TranslateLoc(args[i]).toString());
+                }
+            }
+        }
+    }
+}