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package simpledb;

import java.io.Serializable;

import java.util.Arrays;

import java.util.Iterator;

import simpledb.TupleDesc.TDItem;

/**

* Tuple maintains information about the contents of a tuple. Tuples have a

* specified schema specified by a TupleDesc object and contain Field objects

* with the data for each field.

*/

public class Tuple implements Serializable {

private static final long serialVersionUID = 1L;

private Field[] record;

private TupleDesc tup_desc;

private RecordId rid;

/**

* Create a new tuple with the specified schema (type).

*

* @param td

* the schema of this tuple. It must be a valid TupleDesc

* instance with at least one field.

*/

public Tuple(TupleDesc td) {

tup_desc = td;

record = new Field[tup_desc.numFields()];

}

/**

* @return The TupleDesc representing the schema of this tuple.

*/

public TupleDesc getTupleDesc() {

return tup_desc;

}

/**

* @return The RecordId representing the location of this tuple on disk. May

* be null.

*/

public RecordId getRecordId() {

// some code goes here

return rid;

}

/**

* Set the RecordId information for this tuple.

*

* @param rid

* the new RecordId for this tuple.

*/

public void setRecordId(RecordId rid) {

this.rid = rid;

}

/**

* Change the value of the ith field of this tuple.

*

* @param i

* index of the field to change. It must be a valid index.

* @param f

* new value for the field.

*/

public void setField(int i, Field f) {

// some code goes here

record[i] = f;

}

/**

* @return the value of the ith field, or null if it has not been set.

*

* @param i

* field index to return. Must be a valid index.

*/

public Field getField(int i) {

return record[i];

}

/**

* Returns the contents of this Tuple as a string. Note that to pass the

* system tests, the format needs to be as follows:

*

* column1\tcolumn2\tcolumn3\t...\tcolumnN\n

*

* where \t is any whitespace, except newline, and \n is a newline

*/

public String toString() {

// some code goes here

String output = "";

for(int i = 0; i< record.length; i++)

{

output += record[i].toString();

if(i+1 != record.length) output += " ";

else output += "\n";

}

/*for(Field f:record)

{

output += f.toString();

output += " ";

}

output += "\n";*/

return output;

}

/**

* @return

* An iterator which iterates over all the fields of this tuple

* */

public Iterator<Field> fields()

{

System.out.println("Tuple fields()");

Iterable<Field> iterable = Arrays.asList(record);

return iterable.iterator();

}

/**

* reset the TupleDesc of the tuple

* */

public void resetTupleDesc(TupleDesc td)

{

tup_desc = td; //TODO (unclear)

}

}