Allot of fixes

src/zutil/db/DBQueue.java

@@ -0,0 +1,194 @@
+package zutil.db;
+
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Queue;
+
+import zutil.MultiPrintStream;
+import zutil.converters.Converter;
+
+/**
+ * This class creates a queue that stors the 
+ * data in a mysql table.
+ * The table should look like this:
+ * CREATE TABLE `queue` (
+ * 		`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
+ * 		`data` BINARY NOT NULL
+ * 	);
+ * @author Ziver
+ *
+ */
+public class DBQueue<E> implements Queue<E>{
+	// GO TO KNOW = SELECT LAST_INSERT_ID() as pos_id
+	private DBConnection db;
+	private String table;
+	
+	/**
+	 * Initiates the queue.<br>
+	 * <b>WARNING!!<b> this will erase all rows in the table
+	 * 
+	 * @param db is the connection to the DB
+	 * @param table is the name of the table
+	 */
+	public DBQueue(DBConnection db, String table){
+		this.db = db;
+		this.table = table;
+	}
+
+	public boolean add(Object arg0){
+		try {
+			PreparedStatement sql = db.getPreparedStatement("INSERT INTO "+table+" (data) VALUES(?)");
+			sql.setObject(1, arg0);
+			DBConnection.exec(sql);
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+			return false;
+		}
+		return true;
+	}	
+	
+	public E element() {
+		return peek();
+	}
+
+	public boolean offer(Object arg0) {
+		return add(arg0);
+	}
+
+	@SuppressWarnings("unchecked")
+	public synchronized E peek() {
+		try {
+			return db.exec("SELECT * FROM "+table+" LIMIT 1", new SQLResultHandler<E>(){
+				public E handle(Statement stmt, ResultSet rs) throws SQLException{
+					if (rs.next())
+						try {
+							return (E) Converter.toObject(rs.getBytes("data"));
+						} catch (Exception e) {
+							e.printStackTrace(MultiPrintStream.out);
+						}
+					return null;
+				}
+			});
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}
+		return null;
+	}
+
+	@SuppressWarnings("unchecked")
+	public synchronized E poll() {
+		try {
+			return db.exec("SELECT * FROM "+table+" LIMIT 1", new SQLResultHandler<E>(){
+				public E handle(Statement stmt, ResultSet rs) {
+					try{
+					if (rs.next()) {
+						db.exec("DELETE FROM "+table+" WHERE id="+rs.getInt("id")+" LIMIT 1");
+						return (E) Converter.toObject(rs.getBytes("data"));
+					}
+					}catch(Exception e){
+						e.printStackTrace(MultiPrintStream.out);
+					}
+					return null;
+				}				
+			});
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}
+		return null;
+	}
+
+	public E remove() {
+		return poll();
+	}
+
+	public boolean addAll(Collection<? extends E> arg0) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	public void clear() {
+		try {
+			db.exec("TRUNCATE TABLE `"+table+"`");
+		} catch (SQLException e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}		
+	}
+
+	public boolean contains(Object arg0) {
+		try {
+			return db.exec("SELECT data FROM "+table+" WHERE data='"+Converter.toBytes(arg0)+"' LIMIT 1", new SQLResultHandler<Boolean>(){
+				public Boolean handle(Statement stmt, ResultSet rs) throws SQLException{
+					return rs.next();
+				}
+			});
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}
+		return false;
+	}
+
+	public boolean containsAll(Collection<?> arg0) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	public boolean isEmpty() {
+		return (peek() != null);
+	}
+
+	public Iterator<E> iterator() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	public synchronized boolean remove(Object arg0) {
+		try {
+			db.exec("DELETE FROM "+table+" WHERE data='"+Converter.toBytes(arg0)+"' LIMIT 1");
+			return true;
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}
+		return false;
+	}
+
+	public synchronized boolean removeAll(Collection<?> arg0) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	public boolean retainAll(Collection<?> arg0) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	public int size() {
+		try {
+			return db.exec("SELECT count(*) FROM "+table, new SQLResultHandler<Integer>(){
+				public Integer handle(Statement stmt, ResultSet rs) throws SQLException{
+					if (rs.next()) 
+						return rs.getInt(1);
+					return 0;
+				}
+			});
+		} catch (Exception e) {
+			e.printStackTrace(MultiPrintStream.out);
+		}
+		return 0;
+	}
+
+	public E[] toArray() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@SuppressWarnings("unchecked")
+	public E[] toArray(Object[] arg0) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+}