PHP Design Patterns Composite
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<?
abstract class StudentManager {
abstract function getStudent($previousStudent);
abstract function getStudentCount();
abstract function setStudentCount($new_count);
abstract function addStudent($oneStudent);
abstract function removeStudent($oneStudent);
}
class SingleStudentClass extends StudentManager {
private $firstName;
private $lastName;
function __construct($firstName, $lastName) {
$this->firstName = $firstName;
$this->lastName = $lastName;
}
function getStudent($studentToGet) {
if (1 == $studentToGet) {
return $this->firstName." by ".$this->lastName;
} else {
return FALSE;
}
}
function getStudentCount() {
return 1;
}
function setStudentCount($newCount) {
return FALSE;
}
function addStudent($oneStudent) {
return FALSE;
}
function removeStudent($oneStudent) {
return FALSE;
}
}
class MultipleStudentsClass extends StudentManager {
private $oneStudents = array();
private $studentCount;
public function __construct() {
$this->setStudentCount(0);
}
public function getStudentCount() {
return $this->studentCount;
}
public function setStudentCount($newCount) {
$this->studentCount = $newCount;
}
public function getStudent($studentToGet) {
if ($studentToGet <= $this->studentCount) {
return $this->oneStudents[$studentToGet]->getStudent(1);
} else {
return FALSE;
}
}
public function addStudent($oneStudent) {
$this->setStudentCount($this->getStudentCount() + 1);
$this->oneStudents[$this->getStudentCount()] = $oneStudent;
return $this->getStudentCount();
}
public function removeStudent($oneStudent) {
$counter = 0;
while (++$counter <= $this->getStudentCount()) {
if ($oneStudent->getStudent(1) ==
$this->oneStudents[$counter]->getStudent(1)) {
for ($x = $counter; $x < $this->getStudentCount(); $x++) {
$this->oneStudents[$x] = $this->oneStudents[$x + 1];
}
$this->setStudentCount($this->getStudentCount() - 1);
}
}
return $this->getStudentCount();
}
}
$firstStudent = new SingleStudentClass("A","B");
echo $firstStudent->getStudent(1);
echo "<BR>";
$secondStudent = new SingleStudentClass("C", "D");
echo $secondStudent->getStudent(1);
echo "<BR>";
$students = new MultipleStudentsClass();
$studentsCount = $students->addStudent($firstStudent);
echo $students->getStudent($studentsCount);
echo "<BR>";
$studentsCount = $students->addStudent($secondStudent);
echo $students->getStudent($studentsCount);
echo "<BR>";
$studentsCount = $students->removeStudent($firstStudent);
echo $students->getStudentCount();
echo "<BR>";
echo $students->getStudent(1);
echo "<BR>";
?>
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