gistfile1.java

package com.gmail.ebeletskiy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class HttpManager {
	private HttpClient httpClient;
	private HttpGet httpGet;
	private HttpResponse httpResponse;
	private HttpEntity httpEntity;
	private InputStream instream; 
	private BufferedReader buffReader;
	private String readLine;
	private StringBuilder stringBuilder;
	private JSONObject json;
	
	HttpManager() {
		httpClient = new DefaultHttpClient();
		httpGet = new HttpGet(MyConfig.WEB_SERVER);
		if (MyConfig.DEBUG) Log.d("Dev", "HttpManager created");
	}	
	
	 /*Makes a GET Request to specified URL
	 Return simple JSON*/
	public JSONObject getRequest(URI url) {
		if (MyConfig.DEBUG) Log.d("Dev", "HttpManager's getRequest() invoked");
		try {
			httpResponse = httpClient.execute(httpGet);
			if (httpResponse.getStatusLine().getStatusCode() == 200) {
				httpEntity = httpResponse.getEntity();
				
				if (httpEntity != null) {
					instream = httpEntity.getContent(); 
					String convertedString = convertStreamToString(instream);
					return convertToJSON(convertedString);
				}
			}
			return null;
		} catch (ClientProtocolException e) {
			if (MyConfig.DEBUG) Log.d("Dev", "Something went wrong in getRequest()");
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			if (MyConfig.DEBUG) Log.d("Dev", "Something went wrong in getRequest()");
			e.printStackTrace();
			return null;
		}
	}
	
	/*Reads data from InputStream and put it in String*/
	private String convertStreamToString(InputStream instream) {
		buffReader = new BufferedReader(new InputStreamReader(instream));	
		stringBuilder = new StringBuilder();
		
        try {
        	while ((readLine = buffReader.readLine()) != null) {
				stringBuilder.append(readLine + "\n");
				if (MyConfig.DEBUG) Log.d("Dev", "Read response " + readLine);
			}
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                instream.close();
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }
        return stringBuilder.toString();
	}
	
	/*Converts String to JSON*/
	private JSONObject convertToJSON(String string) {
		try {
			return json = new JSONObject(string);
		} catch (JSONException e) {
			if (MyConfig.DEBUG) Log.d("Dev", "Converting String to JSON was't successfull"); 
			e.printStackTrace();
			return null;
		}
	}
}