silverstripe-framework/src/View/ViewableData_Customised.php

<?php

namespace SilverStripe\View;

class ViewableData_Customised extends ViewableData
{

	/**
	 * @var ViewableData
	 */
	protected $original, $customised;

	/**
	 * Instantiate a new customised ViewableData object
	 *
	 * @param ViewableData $originalObject
	 * @param ViewableData $customisedObject
	 */
	public function __construct(ViewableData $originalObject, ViewableData $customisedObject)
	{
		$this->original = $originalObject;
		$this->customised = $customisedObject;

		$this->original->setCustomisedObj($this);

		parent::__construct();
	}

	public function __call($method, $arguments)
	{
		if ($this->customised->hasMethod($method)) {
			return call_user_func_array(array($this->customised, $method), $arguments);
		}

		return call_user_func_array(array($this->original, $method), $arguments);
	}

	public function __get($property)
	{
		if (isset($this->customised->$property)) {
			return $this->customised->$property;
		}

		return $this->original->$property;
	}

	public function __set($property, $value)
	{
		$this->customised->$property = $this->original->$property = $value;
	}

	public function hasMethod($method)
	{
		return $this->customised->hasMethod($method) || $this->original->hasMethod($method);
	}

	public function cachedCall($field, $arguments = null, $identifier = null)
	{
		if ($this->customised->hasMethod($field) || $this->customised->hasField($field)) {
			return $this->customised->cachedCall($field, $arguments, $identifier);
		}
		return $this->original->cachedCall($field, $arguments, $identifier);
	}

	public function obj($fieldName, $arguments = null, $cache = false, $cacheName = null)
	{
		if ($this->customised->hasField($fieldName) || $this->customised->hasMethod($fieldName)) {
			return $this->customised->obj($fieldName, $arguments, $cache, $cacheName);
		}
		return $this->original->obj($fieldName, $arguments, $cache, $cacheName);
	}

}