<?php
include ('wrapping.php');
class Product {
public $title;
public $description;
public $price;
function getTax() {
return $this->price * $this->taxRate;
}
}
// this wrapper changes how the title is displayed
class ProductTitleWrapping extends WrappingAbstract {
function __get($attr) {
if ($attr == 'title') {
return '!!' . $this->_wrappedObject->$attr . '!!';
}
return parent::__get($attr);
}
}
// this wrapper creates 2 new read only attributes: 'price_with_tax', 'price_without_tax'
class ProductTaxWrapping extends WrappingAbstract {
public $priceIncludesTax = true;
public $taxRate = 0.1;
function __get($attr) {
if ($attr == 'price_with_tax') {
if ($this->priceIncludesTax) {
return $this->_wrappedObject->price;
} else {
return $this->_wrappedObject->price * (1 + $this->taxRate);
}
}
if ($attr == 'price_without_tax') {
if (!$this->priceIncludesTax) {
return $this->_wrappedObject->price;
} else {
return $this->_wrappedObject->price / (1 + $this->taxRate);
}
}
return parent::__get($attr);
}
}
// this wrapper simulates what would happen if you were to sell the product to a different location
// where the tax rate is different
class ProductTaxZoneWrapping extends WrappingAbstract {
function __construct($object, $params = null) {
$object->taxRate = 0.2;
parent::__construct($object, $params);
}
}
function printTestResult($message, $correctValue, $outputValue) {
if ($correctValue == $outputValue) {
echo '<strong style="color: #090">TRUE</strong>: ';
} else {
echo '<strong style="color: #c00">FALSE</strong>: ';
}
if ($correctValue === null) {
$correctValue = 'null';
}
if ($correctValue === true) {
$correctValue = 'true';
}
if ($correctValue === false) {
$correctValue = 'false';
}
if ($outputValue === null) {
$outputValue = 'null';
}
if ($outputValue === true) {
$outputValue = 'true';
}
if ($outputValue === false) {
$outputValue = 'false';
}
printf($message, $correctValue, $outputValue);
echo '<br>';
}
$wf = new WrappingFactory;
$wf->addWrapping('Product', 'ProductTitleWrapping');
$wf->addWrapping('Product', 'ProductTaxWrapping');
$wf->addWrapping('Product', 'ProductTaxZoneWrapping');
echo '<h1>Wrap an existing object</h1>';
// create the product first and then wrap it
$product = new Product;
$product->price = 50;
$product->title = 'iPhone 5';
$product = $wf->wrap($product);
echo '<h2>Test product title</h2>';
printTestResult('Title should be <strong>%s</strong> and is <strong>%s</strong>.', '!!iPhone 5!!', $product->title);
$product->title = 'The new iPhone 5';
printTestResult('After the title was changed it should be <strong>%s</strong> and is <strong>%s</strong>.', '!!The new iPhone 5!!', $product->title);
printTestResult('The title of the BASE object should be <strong>%s</strong> and is <strong>%s</strong>.', 'The new iPhone 5', $product->_getBaseAttribute('title'));
echo '<h2>Test product price</h2>';
printTestResult('Price should be <strong>%s</strong> and is <strong>%s</strong>.', 50, $product->price);
$product->price = 40;
printTestResult('After the price was changed the price should be <strong>%s</strong> and is <strong>%s</strong>.', 40, $product->price);
printTestResult('The price of the BASE object should be <strong>%s</strong> and is <strong>%s</strong>.', 40, $product->_getBaseAttribute('price'));
echo '<h2>Test new attributes (price_with_tax and price_without_tax)</h2>';
printTestResult('Price WITH tax should be <strong>%s</strong> and is <strong>%s</strong>.', 40, $product->price_with_tax);
printTestResult('Price WITHOUT tax should be <strong>%s</strong> and is <strong>%s</strong>.', 40/1.2, $product->price_without_tax);
printTestResult('Tax rate should be <strong>%s</strong> and is <strong>%s</strong>.', 0.2, $product->taxRate);
printTestResult('Tax rate of the BASE object should be <strong>%s</strong> and is <strong>%s</strong>.', null, $product->_getBaseAttribute('taxRate'));
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