//File:  Handle.java
//CS 471 - Operating Systems Project
//Dennis Pereira, Ely Soto, John Cavalieri

//This file is the pointer class used by various functions to hold
//an instance of a specific device, module, file, or pipe. It also contains its //unique identifier and its read/write permissions.

import java.io.RandomAccessFile;
import java.io.IOException;

public class Handle
{
    private Object type;
    // Direct pointer to Object
    private int access;
    // 1 - Read, 2 - Write, 3 - Read/Write
    private String ThreadID;
    // Always Lowercase
    
    public Handle()
    {
    }
    
    public Handle(Object newType, int newAccess, String newID)
    {
        type = newType;
        access = newAccess;
        ThreadID = newID.toLowerCase();
    }
    
    public Object getType()
    {
        return type;
    }
    
    public int getAccess()
    {
        return access;
    }
    
    public String getID()
    {
        return ThreadID;
    }
    
    public void finalize()
    {
        System.out.println("Finalizing: " + ThreadID);
        
        if(ThreadID.startsWith("file"))
        {
            try
            {
                ((RandomAccessFile)type).close();
            }
            catch(IOException ex)
            {
                System.out.println("Error closing File: " + ex);
            }
        }
        if(ThreadID.startsWith("pipe"))
        {
            ((Pipe)type).close();
        }
        
    }
}