restApi.ApiCaller.java Source code

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Here is the source code for restApi.ApiCaller.java

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/*
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package restApi;

import UI.MainUI;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.SwingWorker;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFormattedTextField;
import javax.swing.SwingUtilities;
import static org.apache.http.HttpHeaders.USER_AGENT;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;

/**
 *
 * @author sanju singh
 */
public class ApiCaller extends SwingWorker<Object, Void> {

    private String builtUrl;
    private String jsonStr;
    private MainUI context;

    private String baseUrl = "https://query.yahooapis.com/v1/public/yql?";
    private String q = "select * from yahoo.finance.xchange where pair in (\"USDINR\",\"GBPINR\",\"EURINR\",\"JPYINR\")";
    private String diagnostics = "true";
    private String env = "store://datatables.org/alltableswithkeys";
    private String format = "json";

    public ApiCaller(MainUI context) {
        this.context = context;
    }

    @Override
    protected Void doInBackground() throws IOException {

        List<NameValuePair> params = new LinkedList<NameValuePair>();

        params.add(new BasicNameValuePair("q", q));
        params.add(new BasicNameValuePair("format", format));
        params.add(new BasicNameValuePair("diagnostics", diagnostics));
        params.add(new BasicNameValuePair("env", env));

        String paramString = URLEncodedUtils.format(params, "utf-8");

        builtUrl = baseUrl + paramString;

        HttpClient client = HttpClients.createDefault();

        HttpGet request = new HttpGet(builtUrl);

        // add request header
        request.addHeader("User-Agent", USER_AGENT);

        HttpResponse response = client.execute(request);

        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

        StringBuffer result = new StringBuffer();
        String line = "";
        while ((line = rd.readLine()) != null) {
            result.append(line);
        }

        jsonStr = result.toString();

        return null;

    }

    @Override
    public void done() {
        try {
            get();
            System.out.println("\n" + builtUrl + "\n\n" + jsonStr);
            String[] rate = new JsonDataParser().parseXRate(jsonStr);

            context.showTodayRate(rate);
            context.calcForecast(rate);

        } catch (InterruptedException | ExecutionException ex) {
            context.showNetworkError();
            Logger.getLogger(ApiCaller.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

}