/**
 * A table with forks.
 * 
 * @author Franck van Breugel
 */
public class Table {
	private boolean[] available;
	
	/**
	 * Number of seat on a table.
	 */
	public static int SIZE = 5;
	
	/**
	 * Initializes this empty table.
	 */
	public Table() {
		this.available = new boolean[Table.SIZE];
		for (int id = 0; id < Table.SIZE; id++) {
			this.available[id] = true;
		}
	}

	/**
	 * Pick up the fork from this table with the given id.
	 * 
	 * @param id id of the fork.
	 */
	public synchronized void pickUp(int id) {
		while (!this.available[id]) {
			try {
				this.wait();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		this.available[id] = false;
	}
	
	/**
	 * Put down the fork on the table with the given id.
	 * 
	 * @param id id of the fork.
	 */
	public synchronized void putDown(int id) {
		this.available[id] = true;
		this.notifyAll();
	}
}