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JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6.0.X, MySQL 5.0.x, Apache 2.2.xx and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


Object Iteration

Object Iteration

PHP 5 provides a way for objects to be defined so it is possible to iterate through a list of items, with, for example a foreach statement. By default, all visible properties will be used for the iteration.

Example 19-22. Simple Object Iteration

<?php
class MyClass
{
    
public $var1 = 'value 1';
    
public $var2 = 'value 2';
    
public $var3 = 'value 3';

    
protected $protected = 'protected var';
    
private   $private   = 'private var';

    function
iterateVisible() {
       echo
"MyClass::iterateVisible:\n";
       foreach(
$this as $key => $value) {
           print
"$key => $value\n";
       }
    }
}

$class = new MyClass();

foreach(
$class as $key => $value) {
    print
"$key => $value\n";
}
echo
"\n";


$class->iterateVisible();

?>

The above example will output:

var1 => value 1
var2 => value 2
var3 => value 3

MyClass::iterateVisible:
var1 => value 1
var2 => value 2
var3 => value 3
protected => protected var
private => private var

As the output shows, the foreach iterated through all visible variables that can be accessed. To take it a step further you can implement one of PHP 5's internal interface named Iterator. This allows the object to decide what and how the object will be iterated.

Example 19-23. Object Iteration implementing Iterator

<?php
class MyIterator implements Iterator
{
    
private $var = array();

    
public function __construct($array)
    {
        if (
is_array($array)) {
            
$this->var = $array;
        }
    }

    
public function rewind() {
        echo
"rewinding\n";
        
reset($this->var);
    }

    
public function current() {
        
$var = current($this->var);
        echo
"current: $var\n";
        return
$var;
    }

    
public function key() {
        
$var = key($this->var);
        echo
"key: $var\n";
        return
$var;
    }

    
public function next() {
        
$var = next($this->var);
        echo
"next: $var\n";
        return
$var;
    }

    
public function valid() {
        
$var = $this->current() !== false;
        echo
"valid: {$var}\n";
        return
$var;
    }
}

$values = array(1,2,3);
$it = new MyIterator($values);

foreach (
$it as $a => $b) {
    print
"$a: $b\n";
}
?>

The above example will output:

rewinding
current: 1
valid: 1
current: 1
key: 0
0: 1
next: 2
current: 2
valid: 1
current: 2
key: 1
1: 2
next: 3
current: 3
valid: 1
current: 3
key: 2
2: 3
next:
current:
valid:

You can also define your class so that it doesn't have to define all the Iterator functions by simply implementing the PHP 5 IteratorAggregate interface.

Example 19-24. Object Iteration implementing IteratorAggregate

<?php
class MyCollection implements IteratorAggregate
{
    
private $items = array();
    
private $count = 0;

    
// Required definition of interface IteratorAggregate
    
public function getIterator() {
        return new
MyIterator($this->items);
    }

    
public function add($value) {
        
$this->items[$this->count++] = $value;
    }
}

$coll = new MyCollection();
$coll->add('value 1');
$coll->add('value 2');
$coll->add('value 3');

foreach (
$coll as $key => $val) {
    echo
"key/value: [$key -> $val]\n\n";
}
?>

The above example will output:

rewinding
current: value 1
valid: 1
current: value 1
key: 0
key/value: [0 -> value 1]

next: value 2
current: value 2
valid: 1
current: value 2
key: 1
key/value: [1 -> value 2]

next: value 3
current: value 3
valid: 1
current: value 3
key: 2
key/value: [2 -> value 3]

next:
current:
valid:

Note: For more examples of iterators, see the SPL Extension.


JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6.0.X, MySQL 5.0.x, Apache 2.2.xx and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


 
 
 

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