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package simpledb;

import java.io.Serializable;

/**

* A RecordId is a reference to a specific tuple on a specific page of a

* specific table.

*/

public class RecordId implements Serializable {

private static final long serialVersionUID = 1L;

private PageId r_pid;

private int tuple_num;

/**

* Creates a new RecordId referring to the specified PageId and tuple

* number.

*

* @param pid

* the pageid of the page on which the tuple resides

* @param tupleno

* the tuple number within the page.

*/

public RecordId(PageId pid, int tupleno) {

// some code goes here

r_pid = pid;

tuple_num = tupleno;

}

/**

* @return the tuple number this RecordId references.

*/

public int tupleno() {

// some code goes here

return tuple_num;

}

/**

* @return the page id this RecordId references.

*/

public PageId getPageId() {

// some code goes here

return r_pid;

}

/**

* Two RecordId objects are considered equal if they represent the same

* tuple.

*

* @return True if this and o represent the same tuple

*/

@Override

public boolean equals(Object o) {

// some code goes here

if(o instanceof RecordId)

{

RecordId r_o = (RecordId) o;

boolean pids_equal = r_pid.equals(r_o.r_pid);

boolean tupnos_equal = tuple_num == r_o.tuple_num;

//System.out.println("pid: " + pids_equal + "; tupnos:" + tupnos_equal);

return pids_equal && tupnos_equal;

}

else

{

return false;

}

//throw new UnsupportedOperationException("implement this");

}

/**

* You should implement the hashCode() so that two equal RecordId instances

* (with respect to equals()) have the same hashCode().

*

* @return An int that is the same for equal RecordId objects.

*/

@Override

public int hashCode() {

// some code goes here

String s_page_num = Integer.toString(r_pid.pageNumber());

String s_tuple_num = Integer.toString(tuple_num);

String output = s_page_num + s_tuple_num;

return output.hashCode();

//throw new UnsupportedOperationException("implement this");

}

}