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AddPatientActivity.java
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Thu, Jan 9, 12:22

AddPatientActivity.java
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package ch.epfl.pharma;
import java.sql.SQLException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import ch.epfl.pharma.database.DatabaseHelper;
import ch.epfl.pharma.framework.Patient;
import ch.epfl.pharma.framework.Patient.Sex;
import ch.epfl.pharma.ui.ErrorDialogFragment;
import crypto.elgamal.PartialSecret;
import database.DBconnectorClient;
import database.DatabaseConfig;
public class AddPatientActivity extends Activity {
@SuppressWarnings("unused")
private static final String TAG = AddPatientActivity.class.getName();
private DatabaseHelper mDbHelper = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_patient);
String dbName = getResources().getString(R.string.database_name);
mDbHelper = new DatabaseHelper(this, dbName);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add_patient, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void addPatient(View view) {
EditText editPatientId = (EditText) findViewById(R.id.edittext_addpatient_patientid);
EditText editLastname = (EditText) findViewById(R.id.edittext_addpatient_lastname);
EditText editFirstname = (EditText) findViewById(R.id.edittext_addpatient_firstname);
EditText editAddress = (EditText) findViewById(R.id.edittext_addpatient_address);
String strPatientId = editPatientId.getText().toString();
String lastname = editLastname.getText().toString();
String firstname = editFirstname.getText().toString();
String strAddress = editAddress.getText().toString();
InvalidInputField inputStatus = getInputFieldStatus(strPatientId, lastname, firstname, strAddress);
if (inputStatus == InvalidInputField.NONE) {
int patientId = Integer.valueOf(strPatientId);
Patient patient = new Patient(patientId, firstname, lastname, Sex.NA, null, strAddress, null);
AsyncAddPatient asyncTask = new AsyncAddPatient(this);
asyncTask.execute(patient);
} else {
// invalid fields
InvalidInputDialogFragment invalidDialog = new InvalidInputDialogFragment(inputStatus);
invalidDialog.show(getFragmentManager(), "invalid_input_argument");
switch(inputStatus) {
case PATIENT_ID:
editPatientId.requestFocus();
break;
case LASTNAME:
editLastname.requestFocus();
break;
case FIRSTNAME:
editFirstname.requestFocus();
break;
case ADDRESS:
editAddress.requestFocus();
break;
case NONE:
default:
break;
}
}
}
private InvalidInputField getInputFieldStatus(String strPatientId, String strLastname,
String strFirstname, String strAddress) {
if (strPatientId.isEmpty()) {
return InvalidInputField.PATIENT_ID;
}
if (strLastname.isEmpty()) {
return InvalidInputField.LASTNAME;
}
if (strFirstname.isEmpty()) {
return InvalidInputField.FIRSTNAME;
}
if (strAddress.isEmpty()) {
return InvalidInputField.ADDRESS;
}
return InvalidInputField.NONE;
}
private enum InvalidInputField {
NONE,
PATIENT_ID,
LASTNAME,
FIRSTNAME,
ADDRESS
}
private class InvalidInputDialogFragment extends DialogFragment {
private InvalidInputField reason;
public InvalidInputDialogFragment(InvalidInputField reason) {
this.reason = reason;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Invalid input");
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setMessage(getReasonMessage());
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
return builder.create();
}
private String getReasonMessage() {
String message = "What is patient's ";
switch(reason) {
case ADDRESS:
message += "address";
break;
case FIRSTNAME:
message += "firstname";
break;
case LASTNAME:
message += "lastname";
break;
case PATIENT_ID:
message += "id";
break;
case NONE:
throw new IllegalStateException("Not a consistant InvalidInputfield.");
}
message += "?";
return message;
};
}
private class AsyncAddPatient extends AsyncTask<Patient, Void, AddPatientState> {
private final String TAG = AsyncAddPatient.class.getName();
private Activity parent;
private Handler mHandler;
public AsyncAddPatient(Activity parent) {
super();
this.parent = parent;
this.mHandler = new Handler();
}
@Override
protected void onPreExecute() {
// TODO: show progress bar circle
super.onPreExecute();
}
@Override
protected AddPatientState doInBackground(Patient... patients) {
Patient patient = patients[0];
int patientId = patient.getPatientId();
// status of operation
AddPatientState status;
// check if patient already exists in database
mDbHelper.openDatabase();
boolean patientExists = mDbHelper.patientExists(patient);
if (patientExists) {
status = AddPatientState.EXISTS;
} else {
// request crypto keys from server
PartialSecret secret;
try {
secret = getCryptoKey(patientId);
// insert patient and key into database
mDbHelper.insertPatient(patient);
mDbHelper.insertPrivateKey(patientId, secret);
status = AddPatientState.ADDED;
Log.d(TAG, "Patient inserted: " + patientId);
} catch (SQLException e) {
Log.e(TAG, e.getMessage(), e);
status = AddPatientState.FAILED;
}
}
mDbHelper.close();
return status;
}
@Override
protected void onPostExecute(AddPatientState status) {
switch (status) {
case ADDED:
displayToastSuccessAndQuit();
break;
case EXISTS:
displayWarningPatientExists();
break;
case FAILED:
displayError();
break;
default:
throw new IllegalStateException("Unallowed AddPatient state in adding operation");
}
}
private void displayWarningPatientExists() {
ErrorDialogFragment warningFrag = new ErrorDialogFragment("Patient already exists",
"The patient specified already exists. Specify a new one or cancel operation");
warningFrag.show(getFragmentManager(), "database_patient_exists");
}
private void displayError() {
// display error message
ErrorDialogFragment errorFrag = new ErrorDialogFragment("Connection error",
"Failed to establish connection with distant service to fetch cryptographic key.");
errorFrag.show(getFragmentManager(), "database_access_crypto_failed");
}
private void displayToastSuccessAndQuit() {
Context mContext = getApplicationContext();
CharSequence text = "Patient addedd successfully";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(mContext, text, duration);
toast.show();
// after showing toast, close activity
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
parent.finish();
}
}, duration);
}
private PartialSecret getCryptoKey(int patientId) throws SQLException {
String dbIp = getResources().getString(R.string.db_client_ip);
String dbName = getResources().getString(R.string.db_client_dbname);
String dbUser = getResources().getString(R.string.db_client_user);
String dbPwd = getResources().getString(R.string.db_client_password);
DatabaseConfig dbConfig = new DatabaseConfig(dbIp, dbName, dbUser, dbPwd);
DBconnectorClient dbClient = new DBconnectorClient(dbConfig);
dbClient.openConnection();
PartialSecret secret = dbClient.getPrivateKey(patientId);
dbClient.closeConnection();
return secret;
}
}
private enum AddPatientState {
ADDED,
EXISTS,
FAILED
}
}

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