net.vivekiyer.GAL.ConnectionChecker.java Source code

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Here is the source code for net.vivekiyer.GAL.ConnectionChecker.java

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/* Copyright 2010 Vivek Iyer
 * 
 * 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 net.vivekiyer.GAL;

import java.net.SocketTimeoutException;
import java.net.UnknownHostException;

import org.apache.http.conn.ConnectTimeoutException;

import android.os.AsyncTask;

/**
 * @author Vivek Iyer
 *
 * This class is a helper class that checks if the settings provided by the user are valid
 * and correspond to a valid Exchange server. It does this by querying the Exchange server for
 * OPTIONS (via the OPTIONS command) and gets the Active Sync protocol version supported by the server
 * If the server is running 2007 or above, it also provisions the device on the server. 
 */
class ConnectionChecker extends AsyncTask<ActiveSyncManager, Void, Boolean> {

    public static final int UNDEFINED = -100;
    public static final int SSL_PEER_UNVERIFIED = -101;
    public static final int UNKNOWN_HOST = -102;
    public static final int TIMEOUT = -103;

    // Callback to call once the check is complete
    private TaskCompleteCallback callback;

    // variable that stores the status of the HTTP connection
    private int statusCode = 0;

    // variable that stores the status of the parsed message
    // (if available; if not it is equal to Parser.STATUS_NOT_SET)
    private int requestStatus = Parser.STATUS_NOT_SET;

    // variable that stores the error string
    private String errorString = ""; //$NON-NLS-1$

    /**
     * @param callback Callback to call once the task is complete
     */
    public void setCallback(TaskCompleteCallback callback) {
        this.callback = callback;
    }

    public ConnectionChecker(TaskCompleteCallback _callback) {
        callback = _callback;
    }

    @Override
    protected Boolean doInBackground(ActiveSyncManager... params) {
        try {
            ActiveSyncManager syncMgr = params[0];
            // Let's try to connect to the server
            statusCode = syncMgr.getExchangeServerVersion();

            requestStatus = syncMgr.getRequestStatus();

            return ((statusCode == 200)
                    && ((requestStatus == Parser.STATUS_NOT_SET) || (requestStatus == Parser.STATUS_OK)));

        } catch (javax.net.ssl.SSLPeerUnverifiedException spue) {
            statusCode = SSL_PEER_UNVERIFIED;
            errorString = spue.toString();
            Debug.Log(errorString);
        } catch (UnknownHostException e) {
            statusCode = UNKNOWN_HOST;
            errorString = e.toString();
            Debug.Log(errorString);
        } catch (ConnectTimeoutException e) {
            statusCode = TIMEOUT;
            errorString = e.toString();
            Debug.Log(errorString);
        } catch (SocketTimeoutException e) {
            statusCode = TIMEOUT;
            errorString = e.toString();
            Debug.Log(errorString);
        } catch (Exception e) {
            statusCode = UNDEFINED;
            errorString = e.toString();
            Debug.Log(errorString);
        }
        return false;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        // now that the task is complete
        // call the callback with the status
        callback.taskComplete(result, statusCode, requestStatus, errorString);
    }
}