OOP Aggregation

[Anon]

I'm trying to figure out how to implement the OOP concept of aggregation. For example, I have classes Table, TableRow, and DataCell. An instance of Table contains an array of TableRow objects and in turn each instance of TableRow contains an array of DataCell objects. Basically, Tables have Rows, Rows have DataCells. A Table method called addRow() creates an instance of TableRow. How do I access a TableRow method (like addDataCell())?

Any ideas? Thanks.

Chris

[rrijnders]

<?php

// "Cell" class
class Cell
{
var $myData;
function Cell()
{
$this->myData = 0;
}
function assignCellVal($val)
{
$this->myData = $val;
}

}

// "Row" class
class Row
{
var $myCell;
function Row()
{
// create instance of "Cell"
$this->myCell = new Cell();
}
function assignCellVal($val)
{
$this->myCell->assignCellVal($val);
}
}

// "Table" class
class Table
{
var $myRow;
function Table()
{
// create instance of "Row"
$this->myRow = new Row();
}
function assignCellVal($val)
{
$this->myRow->assignCellVal($val);
}
}

// Create instance of "Table"
// ... which in turn creates a "Row"
// ... which in turn creates a "Cell"
$myTable = new Table();

// Assign a value directly to a cell
$myTable->myRow->myCell->myData = 25;

// Or use proper method invocation
$myTable->assignCellVal(50);

print "The Data Value Is " . $myTable->myRow->myCell->myData;

?>

HTH

-- Rich Rijnders
-- Irvine, CA US