java code for Collection Mapping: TreeMap

PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
























/////////////////////////////////////////////////////////////////////////

import java.util.*;

public class Console {
private int id;
private String name;
private Map games;

public Console() {
}

public Console(String name) {
this.name = name;
}

public void setId(int i) {
id = i;
}

public int getId() {
return id;
}

public void setName(String n) {
name = n;
}

public String getName() {
return name;
}

public void setGames(Map m) {
games = m;
}

public Map getGames() {
return games;
}
}

/////////////////////////////////////////////////////////////////////////
public class Game {
private int id;
private String name;

public Game() {
}

public Game(String name) {
this.name = name;
}

public void setId(int i) {
id = i;
}

public int getId() {
return id;
}

public void setName(String s) {
name = s;
}

public String getName() {
return name;
}

public boolean equals(Object obj) {
if (obj == null) return false;
if (!this.getClass().equals(obj.getClass())) return false;

Game obj2 = (Game)obj;

if ((this.id == obj2.getId()) &&
this.name.equals(obj2.getName())) {
return true;
}

return false;
}

public int hashCode() {
int tmp = 0;
tmp = (id + name).hashCode();

return tmp;
}
}


/////////////////////////////////////////////////////////////////////////

import java.util.*;

public class GameComparator implements Comparator {
public int compare(Object o1, Object o2) {
Game game1 = (Game)o1;
Game game2 = (Game)o2;

return game1.getName().compareTo(game2.getName());
}

public boolean equals(Object obj) {
if (obj == null) return false;
if (!this.getClass().equals(obj.getClass())) return false;


return true;
}

}


/////////////////////////////////////////////////////////////////////////


"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">



org.hsqldb.jdbcDriver
jdbc:hsqldb:data/tutorial
sa



1


org.hibernate.dialect.HSQLDialect


true







/////////////////////////////////////////////////////////////////////////

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

public static final SessionFactory sessionFactory;

static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}

public static final ThreadLocal session = new ThreadLocal();

public static Session currentSession() throws HibernateException {
Session s = (Session) session.get();
// Open a new Session, if this thread has none yet
if (s == null) {
s = sessionFactory.openSession();
// Store it in the ThreadLocal variable
session.set(s);
}
return s;
}

public static void closeSession() throws HibernateException {
Session s = (Session) session.get();
if (s != null)
s.close();
session.set(null);
}

static Connection conn;
static Statement st;
public static void setup(String sql) {
try {
// Step 1: Load the JDBC driver.
Class.forName("org.hsqldb.jdbcDriver");
System.out.println("Driver Loaded.");
// Step 2: Establish the connection to the database.
String url = "jdbc:hsqldb:data/tutorial";

conn = DriverManager.getConnection(url, "sa", "");
System.out.println("Got Connection.");

st = conn.createStatement();
st.executeUpdate(sql);
} catch (Exception e) {
System.err.println("Got an exception! ");
e.printStackTrace();
System.exit(0);
}
}
public static void checkData(String sql) {
try {
HibernateUtil.outputResultSet(st
.executeQuery(sql));
// conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}

public static void outputResultSet(ResultSet rs) throws Exception{
ResultSetMetaData metadata = rs.getMetaData();

int numcols = metadata.getColumnCount();
String[] labels = new String[numcols];
int[] colwidths = new int[numcols];
int[] colpos = new int[numcols];
int linewidth;

for (int i = 0; i < numcols; i++) {
labels[i] = metadata.getColumnLabel(i + 1); // get its label
System.out.print(labels[i]+" ");
}
System.out.println("------------------------");

while (rs.next()) {
for (int i = 0; i < numcols; i++) {
Object value = rs.getObject(i + 1);
if(value == null){
System.out.print(" ");
}else{
System.out.print(value.toString().trim()+" ");
}

}
System.out.println(" ");
}
}
}
/////////////////////////////////////////////////////////////////////////
public class Instructions {
private int id;
private String info;

public Instructions() {
}

public Instructions(String info) {
this.info = info;
}

public void setId(int i) {
id = i;
}

public int getId() {
return id;
}

public void setInfo(String s) {
info = s;
}

public String getInfo() {
return info;
}
}


/////////////////////////////////////////////////////////////////////////
import java.io.Serializable;
import java.util.*;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.criterion.*;
import org.hibernate.event.*;
import org.hibernate.event.def.*;

public class Main {
public static void main(String[] args) throws Exception {
HibernateUtil.setup("create table console (id int, name varchar);");
HibernateUtil.setup("create table game (id int, name varchar);");
HibernateUtil.setup("create table instructions (id int, info varchar );");
HibernateUtil.setup("create table game_instructions (parent_id int,game_id int,instructions_id int);");

Session session = HibernateUtil.currentSession();


Console sp = new Console("Console");

TreeMap p = new TreeMap(new GameComparator());
Game g = new Game("Game 1");
Game g2 = new Game("Game 2");
p.put(g, new Instructions("Instructions for Game 1"));
p.put(g2, new Instructions("Instructions for Game 2"));
sp.setGames(p);

session.save(g);
session.save(g2);
session.flush();

session.save(sp);
session.flush();


session.flush();
session.close();
HibernateUtil.checkData("select * from console");
HibernateUtil.checkData("select * from game");
HibernateUtil.checkData("select * from instructions");
HibernateUtil.checkData("select * from game_instructions");
}
}