public class DatabaseListView extends SQLiteOpenHelper {
private Context context;
private static final String DATABASE_NAME = "person.db";
private static final int DATABASE_VERSION = 1;
private static final String TABlE_NAME = "person";
private static final String COLUMN_ID = "_Id";
private static final String COLUMN_NAME = "Name";
private static final String COLUMN_BIRTH_DATE = "Birth_Date";
private static final String COLUMN_GENDER = "Gender";
private static final String COLUMN_INTERESTS = "Interests";
private static final String COLUMN_CHINESE_LEVEL = "Chinese_Level";
private static final String COLUMN_SELF_INTRO = "Self_Introduction";
public DatabaseListView(#Nullable Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
String sql = "CREATE TABLE " + TABlE_NAME +
" (" + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_NAME + " TEXT, " +
COLUMN_BIRTH_DATE + " TEXT," +
COLUMN_GENDER + " TEXT, " +
COLUMN_INTERESTS + " TEXT, " +
COLUMN_CHINESE_LEVEL + " DOUBLE, " +
COLUMN_SELF_INTRO + " TEXT)";
sqLiteDatabase.execSQL(sql);
}
public void saveInfo(String personName, String personBirth, String personGender, String personInterests,
double chineseLevel, String selfIntro) {
SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(COLUMN_NAME, personName);
cv.put(COLUMN_BIRTH_DATE, personBirth);
cv.put(COLUMN_GENDER, personGender);
cv.put(COLUMN_INTERESTS, personInterests);
cv.put(COLUMN_CHINESE_LEVEL, chineseLevel);
cv.put(COLUMN_SELF_INTRO, selfIntro);
sqLiteDatabase.insert(TABlE_NAME, null, cv);
sqLiteDatabase.close();
}
#Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
sqLiteDatabase.execSQL("DROP TABLE IF EXISTS " + TABlE_NAME);
onCreate(sqLiteDatabase);
}
}
This Question is about Android Studio Person Manager project I've created the table "person.db " but i can't see my database saved in sqlite browser all i see is an empty table but no data information.
have a look at the official docs from google.
When working with Databases i suggest using a ORM. I "automatically" creates your tables, manage your relationships and insert data in an efficent way
Related
I've got an object that looks like this
import lombok.Data;
import org.neo4j.ogm.annotation.GraphId;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.Relationship;
import java.util.HashSet;
import java.util.Set;
#Data
#NodeEntity
public class GPlayer {
#GraphId
private Long id;
#Relationship(type = "comrade", direction = Relationship.UNDIRECTED)
private Set<GPlayer> comrades;
// #Indexed(unique = true) doesn't work in v4
private String name;
/**
* Adds new comrade.
*
* #param comrade comrade
*/
public void acquainted(GPlayer comrade) {
if (null == comrades) {
comrades = new HashSet<>();
} else {
if (comrades.contains(comrade)) {
return;
}
}
comrades.add(comrade);
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
GPlayer gPlayer = (GPlayer) o;
if (!id.equals(gPlayer.id)) return false;
return name.equals(gPlayer.name);
}
#Override
public int hashCode() {
int result = super.hashCode();
result = 31 * result + id.hashCode();
result = 31 * result + name.hashCode();
return result;
}
#Override
public String toString() {
return "GPlayer{" +
"id=" + id +
", comrades=" + comrades +
", name='" + name + '\'' +
'}';
}
}
I want to store it in Neo4j with unique name. So when I insert GPlayer - if the object with such name doesn't exist I don't want to insert it.
I have repository that looks like this
public interface GraphPlayerRepository extends GraphRepository<GPlayer> {
List<GPlayer> findAll();
GPlayer findByName(String name);
}
To insert I do like this
private Long createPlayer(String playerName, String comrade, GraphPlayerRepository gRepo) {
GPlayer gPlayer = gRepo.findByName(playerName);
if (null == gPlayer) {
gPlayer = new GPlayer();
gPlayer.setName(playerName);
if (null != comrade) {
gPlayer.acquainted(gRepo.findByName(comrade));
}
gRepo.save(gPlayer);
LOGGER.info("Created new GRAPH player: {}", gPlayer);
} else {
gPlayer.acquainted(gRepo.findByName(comrade));
gRepo.save(gPlayer);
LOGGER.info("Updated player: {}", gPlayer);
}
return gPlayer.getId();
}
But it looks rather verbose. Is there a way to make it simpler?
You could use the name as the id of the entity
#Index(unique=true, primary=true)
private String name;
Then no need to declare the findByName method, just use Neo4jRepository
public interface GraphPlayerRepository extends Neo4jRepository<GPlayer, String> {
...
}
and use repository.findOne(name) to get players from the name.
That said, the implementation of hashCode and Equals is incorrect : it is strongly advised not to use the Long id in these. See here.
Otherwise, not related to SDN, but improvements could include :
use lombok to generate hashcode and equals
initialize the hashSet at the field level
You could also migrate to SDN 5 and make use of Optional return types to avoid the if/else nullity check blocks.
I have some tweets that I have already indexed "TweetIndexer" with lucene knowing that each tweet contains an ID, USER, TEXT, and DATE.
I want to only retrieve the date with another class "TweetSearcher" how to proceed?
Example of tweet:
"0","1467811372","Mon Apr 06 22:20:00 PDT 2009","NO_QUERY","joy_wolf","#Kwesidei not the whole crew ".
This my class TweetIndexer:
import org.apache.lucene.analysis.core.KeywordAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
public class TweetIndexer {
protected static final String COMMA = "\",\"";
protected static final String POLARITY = "polarity";
protected static final String ID = "id";
protected static final String DATE = "date";
protected static final String QUERY = "query";
protected static final String USER = "user";
protected static final String TEXT = "text";
public static void main(String[] args) throws Exception {
try {
String indexDir = "D:\\tweet\\index";
String dataFile = "D:\\tweet\\collection\\tweets.csv";
TweetIndexer tweetIndexer = new TweetIndexer();
long start = System.currentTimeMillis();
int count = tweetIndexer.index(new File(indexDir), new File(dataFile));
System.out.print(String.format("Indexed %d documents in %d seconds", count, (System.currentTimeMillis() - start) / 1000));
}
catch (Exception e) {
System.out.println("Usage: java TweetIndexer <index directory> <csv data file>");
}
}
private int index(File indexDir, File dataFile) throws Exception {
IndexWriter indexWriter = new IndexWriter(
FSDirectory.open(indexDir),
new IndexWriterConfig(Version.LUCENE_44, new KeywordAnalyzer()));
int count = indexFile(indexWriter, dataFile);
indexWriter.close();
return count;
}
private int indexFile(IndexWriter indexWriter, File dataFile) throws IOException {
FieldType fieldType = new FieldType();
fieldType.setStored(true);
fieldType.setIndexed(true);
BufferedReader bufferedReader = new BufferedReader(new FileReader(dataFile));
String line = "";
int count = 0;
while ((line = bufferedReader.readLine()) != null) {
// Hack to ignore commas within elements in csv (so we can split on "," rather than just ,)
line = line.substring(1, line.length() - 1);
String[] tweetInfo = line.split(COMMA);
Document document = new Document();
document.add(new Field(POLARITY, tweetInfo[0], fieldType));
document.add(new Field(ID, tweetInfo[1], fieldType));
document.add(new Field(DATE, tweetInfo[2], fieldType));
document.add(new Field(QUERY, tweetInfo[3], fieldType));
document.add(new StringField(USER, tweetInfo[4], Field.Store.YES));
document.add(new StringField(TEXT, tweetInfo[5], Field.Store.YES));
indexWriter.addDocument(document);
count++;
}
return count;
}
}
And this is short java code for my class TweetSearcher:
public class TweetSearcher {
public static void main(String[] args) throws Exception {
try {
String indexDir = "D:\\tweet\\index";
int numHits = Integer.parseInt("3");
TweetSearcher tweetSearcher = new TweetSearcher();
tweetSearcher.dateSearch(new File(indexDir), numHits);
private void dateSearch(File indexDir, int numHits) throws Exception {
System.out.println("Find dates:");
Directory directory = FSDirectory.open(indexDir);
DirectoryReader directoryReader = DirectoryReader.open(directory);
IndexSearcher indexSearcher = new IndexSearcher(directoryReader);
I am trying to use AWS Cognito services for user authentication through ruby SDK.
I could able to sign_up, confirm sign_up process using the methods
resp = client.sign_up({ client_id: "ClientIdType",
secret_hash: "SecretHashType",
username: "UsernameType",
password: "PasswordType",
user_attributes: [{ name:"AttributeNameType",
value: "AttributeValueType",
}],
validation_data: [{
name: "AttributeNameType",
value: "AttributeValueType",
}]
})
and confirm_sign_up using
resp = client.confirm_sign_up({client_id: "ClientIdType",
secret_hash: "SecretHashType",
username: "UsernameType",
confirmation_code: "ConfirmationCodeType"
})
But while trying to sign in the user through initiate_auth I am getting an error Missing required parameter SRP_A
cog_provider.initiate_auth({client_id: "xxxxxxxxx", auth_parameters: { username: "xxx", password: "xxx"}, auth_flow: "USER_SRP_AUTH"})
What does SRP_A indicate where to find it.
I have searched for this problem and It is suggested to use the admin_initiate_auth method for signing in a user which I don't believe a best practice.
Yes, SRP_A is a large integer as defined by the Secure Remote Password Protocol. Are you trying to do SRP or just authenticate with username and password. For username/password authentication you should use the AdminInitiateAuth operation.
In our SDKs, you can see the parameters that need to be computed and passed. Take for example the Javascript SDK:
https://github.com/aws/amazon-cognito-identity-js/blob/master/src/CognitoUser.js#L152
Or in the Android SDK:
https://github.com/aws/aws-sdk-android/blob/master/aws-android-sdk-cognitoidentityprovider/src/main/java/com/amazonaws/mobileconnectors/cognitoidentityprovider/CognitoUser.java#L2123
For AWS Java SDK:
here is the class to manage this:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.math.pro.ak.util.cognito;
import com.amazonaws.AmazonClientException;
import com.amazonaws.util.StringUtils;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
*
* #author marcus
*/
public class AuthenticationHelper {
private BigInteger a;
private BigInteger A;
private String poolName;
public AuthenticationHelper(String userPoolName) {
do {
a = new BigInteger(EPHEMERAL_KEY_LENGTH, SECURE_RANDOM).mod(N);
A = GG.modPow(a, N);
} while (A.mod(N).equals(BigInteger.ZERO));
if (userPoolName.contains("_")) {
poolName = userPoolName.split("_", 2)[1];
} else {
poolName = userPoolName;
}
}
public BigInteger geta() {
return a;
}
public BigInteger getA() {
return A;
}
private static final String HEX_N = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
+ "29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
+ "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
+ "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
+ "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
+ "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
+ "83655D23DCA3AD961C62F356208552BB9ED529077096966D"
+ "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B"
+ "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
+ "DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
+ "15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64"
+ "ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7"
+ "ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B"
+ "F12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
+ "BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31"
+ "43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF";
private static final BigInteger N = new BigInteger(HEX_N, 16);
private static final BigInteger GG = BigInteger.valueOf(2);
private static final BigInteger KK;
private static final int EPHEMERAL_KEY_LENGTH = 1024;
private static final int DERIVED_KEY_SIZE = 16;
private static final String DERIVED_KEY_INFO = "Caldera Derived Key";
private static final ThreadLocal<MessageDigest> THREAD_MESSAGE_DIGEST = new ThreadLocal<MessageDigest>() {
#Override
protected MessageDigest initialValue() {
try {
return MessageDigest.getInstance("SHA-256");
} catch (final NoSuchAlgorithmException e) {
throw new AmazonClientException("Exception in authentication", e);
}
}
};
private static final SecureRandom SECURE_RANDOM;
static {
try {
SECURE_RANDOM = SecureRandom.getInstance("SHA1PRNG");
final MessageDigest messageDigest = THREAD_MESSAGE_DIGEST.get();
messageDigest.reset();
messageDigest.update(N.toByteArray());
final byte[] digest = messageDigest.digest(GG.toByteArray());
KK = new BigInteger(1, digest);
} catch (final NoSuchAlgorithmException e) {
throw new AmazonClientException(e.getMessage(), e);
}
}
public byte[] getPasswordAuthenticationKey(String userId,
String userPassword,
BigInteger B,
BigInteger salt) {
// Authenticate the password
// u = H(A, B)
final MessageDigest messageDigest = THREAD_MESSAGE_DIGEST.get();
messageDigest.reset();
messageDigest.update(A.toByteArray());
final BigInteger u = new BigInteger(1, messageDigest.digest(B.toByteArray()));
if (u.equals(BigInteger.ZERO)) {
throw new AmazonClientException("Hash of A and B cannot be zero");
}
// x = H(salt | H(poolName | userId | ":" | password))
messageDigest.reset();
messageDigest.update(poolName.getBytes(StringUtils.UTF8));
messageDigest.update(userId.getBytes(StringUtils.UTF8));
messageDigest.update(":".getBytes(StringUtils.UTF8));
final byte[] userIdHash = messageDigest.digest(userPassword.getBytes(StringUtils.UTF8));
messageDigest.reset();
messageDigest.update(salt.toByteArray());
final BigInteger x = new BigInteger(1, messageDigest.digest(userIdHash));
final BigInteger s = (B.subtract(KK.multiply(GG.modPow(x, N)))
.modPow(a.add(u.multiply(x)), N)).mod(N);
Hkdf hkdf = null;
try {
hkdf = Hkdf.getInstance("HmacSHA256");
} catch (final NoSuchAlgorithmException e) {
throw new AmazonClientException(e.getMessage(), e);
}
hkdf.init(s.toByteArray(), u.toByteArray());
final byte[] key = hkdf.deriveKey(DERIVED_KEY_INFO, DERIVED_KEY_SIZE);
return key;
}
}
And call this the method:
userAuth.put("SRP_A", new AuthenticationHelper(request.getUsername()).getA().toString(16));
I'm new to java and I have a problem with reading a file using the scanner class.
My objective is to read the following .txt file:
3
Emmalaan 23
3051JC Rotterdam
7 rooms
price 300000
Javastraat 88
4078KB Eindhoven
3 rooms
price 50000
Javastraat 93
4078KB Eindhoven
4 rooms
price 55000
The "3" on top of the file should be read as an integer that tells how many houses the file has. The following four lines after the "3" determine one house.
I try to read this file using a read method in the class portefeuille:
public static Portefeuille read(String infile)
{
Portefeuille returnvalue = new Portefeuille();
try
{
Scanner scan = new Scanner(new File(infile)).useDelimiter(" |/n");
int aantalwoningen = scan.nextInt();
for(int i = 0; i<aantalwoningen; ++i)
{
Woning.read(scan);
}
}
catch (FileNotFoundException e)
{
System.out.println("File could not be found");
}
catch (IOException e)
{
System.out.println("Exception while reading the file");
}
return returnvalue;
}
The read method in the Woning class looks like this:
public static Woning read(Scanner sc)
{
String token_adres = sc.next();
String token_dr = sc.next();
String token_postcd = sc.next();
String token_plaats = sc.next();
int token_vraagPrijs = sc.nextInt();
String token_kamerstxt = sc.next();
String token_prijstxt = sc.next();
int token_kamers = sc.nextInt();
return new Woning(adresp, token_vraagPrijs, token_kamers);
}
When I try to execute the following code:
Portefeuille port1 = Portefeuille.read("woningen.txt");
I get the following error:
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at Portefeuille.read(Portefeuille.java:48)
at Portefeuille.main(Portefeuille.java:112)
However if I use the read method from the Woning class to read one adres in a string format:
Emmalaan 23
3051JC Rotterdam
7 Rooms
price 300000
It works fine.
I tried to change the .txt file into only one address without the "3" on top so that it is exactly formatted like the address that should work. But when I call the read method from Woning class it still gives me the error.
Could anyone please help me with this?
Thank you!
I was also facing a similar issue, so I put my answer so that it could help in future:
There are two possible modifications which I did to make this code run.
First option: Change the use of useDelimiter method to .useDelimiter("\\r\\n") when creating the Scanner class, I was in windows so we might need \\r for Windows compatibility.
Using this modification, there will be no exception.But the code will again fail at int token_vraagPrijs = sc.nextInt();.
Because in the public static Woning read(Scanner sc), you are suing sc.next();.Actually this method finds and returns the next complete token from this scanner.A complete token is preceded and followed by input that matches the delimiter pattern.
So, every sc.next() is actually reading a line not a token.
So as per your code sc.nextInt() is trying to read something like Javastraat 88.So again it will give you the same exception.
Second option (Preferred):Don't use any delimiter, Scanner class will default whitespace and your code will work fine.I modified your code and It worked fine for me.
Code:
public class Test3{
public static void main(String... s)
{
read("test.txt");
}
public static void read(String infile)
{
try (Scanner scan = new Scanner(new File(infile)))
{
int aantalwoningen = scan.nextInt();
System.out.println(aantalwoningen);
for (int i = 0; i < aantalwoningen; ++i)
{
read(scan);
}
}
catch (FileNotFoundException e)
{
System.out.println("File could not be found");
}
}
public static void read(Scanner sc)
{
String token_adres = sc.next();
String token_dr = sc.next();
String token_postcd = sc.next();
String token_plaats = sc.next();
int token_vraagPrijs = sc.nextInt();
String token_kamerstxt = sc.next();
String token_prijstxt = sc.next();
int token_kamers = sc.nextInt();
System.out.println(token_adres + " " + token_dr + " " + token_postcd + " " + token_plaats + " "
+ token_vraagPrijs + " " + token_kamerstxt + " " + token_prijstxt + " " + token_kamers);
} }
I have to write a standalone Java app that monitors CQ5, deployed inside Weblogic (especially memory usage).
I was able to connect to the Domain Runtime Server in weblogic, using the class below (as found in the docs).
Now, I want to know which MBeans I need to monitor memory lows, so I can fire an event whenever a certain threshold is being hit.
Can any of you give me some insight? This is a pure JMX / Java question, unrelated to CQ.
I am trying to programmatically recreate what Jconsole already does. But I need it programmatically because I need to talk to an external API in case certain thresholds are being hit.
public class PrintServerState {
private static MBeanServerConnection connection;
private static JMXConnector connector;
private static final ObjectName service;
private static final ObjectName bundleWrite;
static {
try {
service = new ObjectName("com.bea:Name=DomainRuntimeService,Type=weblogic.management.mbeanservers.domainruntime.DomainRuntimeServiceMBean");
} catch (MalformedObjectNameException e) {
throw new AssertionError(e.getMessage());
}
}
/*
* Initialize connection to the Domain Runtime MBean Server
*/
public static void initConnection(String hostname, String portString,
String username, String password) throws IOException,
MalformedURLException {
String protocol = "t3";
Integer portInteger = Integer.valueOf(portString);
int port = portInteger.intValue();
String jndiroot = "/jndi/";
String mserver = "weblogic.management.mbeanservers.domainruntime";
JMXServiceURL serviceURL = new JMXServiceURL(protocol, hostname,
port, jndiroot + mserver);
Hashtable h = new Hashtable();
h.put(Context.SECURITY_PRINCIPAL, username);
h.put(Context.SECURITY_CREDENTIALS, password);
h.put(JMXConnectorFactory.PROTOCOL_PROVIDER_PACKAGES,
"weblogic.management.remote");
connector = JMXConnectorFactory.connect(serviceURL, h);
connection = connector.getMBeanServerConnection();
System.out.println("***************** get mbean count ************************* " + connection.getMBeanCount());
Set<ObjectName> mbeans = connection.queryNames(null, null);
for (ObjectName mbeanName : mbeans) {
System.out.println(mbeanName);
}
System.out.println("********************** ---- ***********************");
}
/*
* Print an array of ServerRuntimeMBeans.
* This MBean is the root of the runtime MBean hierarchy, and
* each server in the domain hosts its own instance.
*/
public static ObjectName[] getServerRuntimes() throws Exception {
return (ObjectName[])connection.getAttribute(service,
"ServerRuntimes");
}
/*
* Iterate through ServerRuntimeMBeans and get the name and state
*/
public void printNameAndState() throws Exception {
ObjectName[] serverRT = getServerRuntimes();
System.out.println("got server runtimes");
int length = (int) serverRT.length;
for (int i = 0; i < length; i++) {
String name = (String) connection.getAttribute(serverRT[i],
"Name");
String state = (String) connection.getAttribute(serverRT[i],
"Type");
System.out.println("Server name: " + name + ". Server state: "
+ state);
}
}
public static void main(String[] args) throws Exception {
String hostname = args[0];
String portString = args[1];
String username = args[2];
String password = args[3];
PrintServerState s = new PrintServerState();
System.out.println("hostname " + hostname);
System.out.println("portString " + portString);
System.out.println("username " + username);
System.out.println("password " + password);
initConnection(hostname, portString, username, password);
System.out.println("**************************************************");
s.printNameAndState();
connector.close();
}
}
Would this help -
domainRuntime()
cd('/ServerRuntimes/' + eval('managedServerName') + '/JVMRuntime/' + eval('managedServerName'))
heapFreeCurrentPerOld = str(cmo.getHeapFreePercent())
heapFreeCurrentValOld = str(cmo.getHeapFreeCurrent())