ch.nexuscomputing.android.osciprimeics.news.HttpsTask.java Source code

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Here is the source code for ch.nexuscomputing.android.osciprimeics.news.HttpsTask.java

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/**
OsciPrime an Open Source Android Oscilloscope
Copyright (C) 2012  Manuel Di Cerbo, Nexus-Computing GmbH Switzerland
Copyright (C) 2012  Andreas Rudolf, Nexus-Computing GmbH Switzerland
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package ch.nexuscomputing.android.osciprimeics.news;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

public class HttpsTask {

    private static final int THREAD_JOIN_TIMEOUT = 1000;

    public interface IResponseCallback {
        void onResponse(News news);

        void onFinish();

        void onError(String msg);

        void onStartException(String msg);

        void onKillException(String msg);
    }

    private final HttpClient mHttpClient;
    private final HttpPost mHttpPost = new HttpPost();
    private final Thread mTaskThread;
    private final IResponseCallback mCallback;

    private final String mUrl;

    /**
     * used for several requests, for instance send outbox
     * 
     * @param url
     * @param params
     * @param callback
     */
    public HttpsTask(String url, IResponseCallback callback) {
        mUrl = url;
        mCallback = callback;
        mTaskThread = initThread();
        mTaskThread.setName("HttpTask");
        mHttpClient = new DefaultHttpClient();

    }

    public void start() {
        try {
            mTaskThread.start();
        } catch (IllegalStateException e) {
            mCallback.onStartException("Thread has already been started before");
        }

    }

    public void kill() {
        mHttpPost.abort();
        try {
            mTaskThread.join(THREAD_JOIN_TIMEOUT);
        } catch (InterruptedException e) {
            mCallback.onKillException("Could not join thread!");
        }
    }

    private Thread initThread() {
        return new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    String resp = connect();
                    News news = NewsParser.parse(resp);
                    if (news != null)
                        mCallback.onResponse(news);
                    else {
                        mCallback.onError("could not parse news");
                    }
                } catch (URISyntaxException e) {
                    if (e.getMessage() != null)
                        mCallback.onError("URISyntaxException: " + e.getMessage());
                    else
                        mCallback.onError("unclassified error occured during the http task");
                    return;
                } catch (UnsupportedEncodingException e) {
                    if (e.getMessage() != null)
                        mCallback.onError("UnsupportedEncodingException: " + e.getMessage());
                    else
                        mCallback.onError("unclassified error occured during the http task");
                    return;
                } catch (ClientProtocolException e) {
                    if (e.getMessage() != null)
                        mCallback.onError("ClientProtocolException: " + e.getMessage());
                    else
                        mCallback.onError("unclassified error occured during the http task");
                    return;
                } catch (IOException e) {
                    if (e.getMessage() != null)
                        mCallback.onError("IOException: " + e.getMessage());
                    else
                        mCallback.onError("unclassified error occured during the http task");
                    return;
                } catch (IllegalStateException e) {
                    if (e.getMessage() != null)
                        mCallback.onError("IOException: " + e.getMessage());
                    else
                        mCallback.onError("unclassified error occured during the http task");
                    return;
                }
                mCallback.onFinish();
            }
        });
    }

    private String connect() throws URISyntaxException, ClientProtocolException, IOException {
        mHttpPost.setURI(new URI(mUrl));
        HttpResponse resp = mHttpClient.execute(mHttpPost);
        BufferedReader brdr = new BufferedReader(new InputStreamReader(resp.getEntity().getContent()));
        StringBuffer sb = new StringBuffer();
        String line = "";
        while ((line = brdr.readLine()) != null) {
            sb.append(line);
        }
        return sb.toString();
    }

    public String getUrl() {
        return mUrl;
    }

    public IResponseCallback getCallback() {
        return mCallback;
    }

}