com.alphabetbloc.accessmrs.tasks.CheckConnectivityTask.java Source code

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Here is the source code for com.alphabetbloc.accessmrs.tasks.CheckConnectivityTask.java

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/*
 * Copyright (C) 2012 Louis Fazen
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.alphabetbloc.accessmrs.tasks;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.AbstractHttpEntity;

import android.content.SharedPreferences;
import android.content.SyncResult;
import android.os.AsyncTask;
import android.preference.PreferenceManager;

import com.alphabetbloc.accessmrs.R;
import com.alphabetbloc.accessmrs.listeners.SyncDataListener;
import com.alphabetbloc.accessmrs.utilities.App;
import com.alphabetbloc.accessmrs.utilities.NetworkUtils;

/**
 * 
 * @author Louis Fazen (louis.fazen@gmail.com)
 * 
 */
public class CheckConnectivityTask extends AsyncTask<SyncResult, String, String> {

    private String mServer;
    static final int MAX_CONN_PER_ROUTE = 20;
    static final int MAX_CONNECTIONS = 20;
    //   private static final String TAG = CheckConnectivityTask.class.getSimpleName();

    protected SyncDataListener mStateListener;
    private HttpClient httpClient;

    protected static String mUsername;
    protected static String mPassword;
    protected static Integer mCohort;
    protected static boolean mSavedSearch;
    protected static Integer mProgram;
    protected static SyncResult sSyncResult;

    @Override
    protected String doInBackground(SyncResult... values) {
        sSyncResult = values[0];
        boolean connected = false;

        try {
            getServerCredentials();
            httpClient = NetworkUtils.getHttpClient();
            DataInputStream dis = getServerStream();
            if (dis != null) {
                dis.close();
                connected = true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return String.valueOf(connected);
    }

    @Override
    protected void onPostExecute(String result) {
        // reset the credentials
        mUsername = null;
        mPassword = null;
        mCohort = null;
        mProgram = null;
        mServer = null;

        synchronized (this) {
            if (mStateListener != null)
                mStateListener.syncComplete(result, sSyncResult);

        }
    }

    public void setSyncListener(SyncDataListener sl) {
        synchronized (this) {
            mStateListener = sl;
        }
    }

    public void setServerCredentials(String username, String password) {
        setServerCredentials(null, username, password);
    }

    public void setServerCredentials(String server, String username, String password) {
        mServer = server;
        mUsername = username;
        mPassword = password;
    }

    protected void getServerCredentials() {
        if (mServer == null)
            mServer = NetworkUtils.getPatientDownloadUrl();
        if (mUsername == null)
            mUsername = NetworkUtils.getServerUsername();
        if (mPassword == null)
            mPassword = NetworkUtils.getServerPassword();

        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(App.getApp());
        mSavedSearch = settings.getBoolean(App.getApp().getString(R.string.key_use_saved_searches), false);
        mCohort = Integer.valueOf(settings.getString(App.getApp().getString(R.string.key_saved_search), "0"));
        mProgram = Integer.valueOf(settings.getString(App.getApp().getString(R.string.key_program), "0"));
    }

    protected DataInputStream getServerStream() throws Exception {

        HttpPost request = new HttpPost(mServer);
        request.setEntity(new OdkAuthEntity());
        HttpResponse response = httpClient.execute(request);
        response.getStatusLine().getStatusCode();
        HttpEntity responseEntity = response.getEntity();
        responseEntity.getContentLength();

        DataInputStream zdis = new DataInputStream(new GZIPInputStream(responseEntity.getContent()));

        int status = zdis.readInt();
        if (status == HttpURLConnection.HTTP_UNAUTHORIZED) {
            zdis.close();
            throw new IOException("Access denied. Check your username and password.");
        } else if (status <= 0 || status >= HttpURLConnection.HTTP_BAD_REQUEST) {
            zdis.close();
            throw new IOException("Connection Failed. Please Try Again.");
        } else {
            assert (status == HttpURLConnection.HTTP_OK); // success
            return zdis;
        }
    }

    private static class OdkAuthEntity extends AbstractHttpEntity {

        public boolean isRepeatable() {
            return false;
        }

        public long getContentLength() {
            return -1;
        }

        public boolean isStreaming() {
            return false;
        }

        public InputStream getContent() throws IOException {
            // Should be implemented as well but is irrelevant for this case
            throw new UnsupportedOperationException();
        }

        public void writeTo(final OutputStream outstream) throws IOException {
            DataOutputStream dos = new DataOutputStream(new GZIPOutputStream(outstream));
            dos.writeUTF(mUsername);
            dos.writeUTF(mPassword);
            dos.writeBoolean(mSavedSearch);
            if (mCohort > 0)
                dos.writeInt(mCohort);
            if (mProgram > 0)
                dos.writeInt(mProgram);
            dos.close();
        }

    };

}