org.openbmap.unifiedNlp.services.JSONParser.java Source code

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Here is the source code for org.openbmap.unifiedNlp.services.JSONParser.java

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/*
   Radiobeacon - Openbmap Unified Network Location Provider
Copyright (C) 2013  wish7
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package org.openbmap.unifiedNlp.services;

import android.util.Log;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import org.openbmap.unifiedNlp.BuildConfig;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

public class JSONParser {
    private static final String TAG = JSONParser.class.getSimpleName();
    private static final String USER_AGENT = "Openbmap NLP/" + BuildConfig.VERSION_NAME;

    private static InputStream is = null;
    private static JSONObject jObj = null;
    private static String json = "";

    // constructor
    public JSONParser() {
    }

    /**
     * Sends a http post request
     *
     * @param url JSON endpoint
     * @param params JSON parameters
     * @return server reply
     */
    public JSONObject getJSONFromUrl(String url, JSONObject params) {

        try {
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            //passes the results to a string builder/entity
            StringEntity se = new StringEntity(params.toString());

            //sets the post request as the resulting string
            httpPost.setEntity(se);
            //sets a request header so the page receving the request
            //will know what to do with it
            httpPost.setHeader("Accept", "application/json");
            httpPost.setHeader("Content-type", "application/json");
            httpPost.setHeader("User-Agent", USER_AGENT);
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "n");
                }
                is.close();
                json = sb.toString();
            } catch (Exception e) {
                Log.e(TAG, "Error converting result " + e.toString());
            }

            try {
                httpEntity.consumeContent();
            } catch (IOException e) {
                Log.e(TAG, "Error closing http entity");
            }

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON String
        return jObj;
    }
}