PhutilMethodNotImplementedException.php
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	<?php

	/**
	* An exception thrown when a method is called on a class which does not
	* provide an implementation for the called method. This is sometimes the case
	* when a base class expects subclasses to provide their own implementations,
	* for example.
	*/
	final class PhutilMethodNotImplementedException extends Exception {

	public function __construct($message = null) {
	if ($message) {
	parent::__construct($message);
	} else {
	$caller = idx(debug_backtrace(false), 1);

	$class = idx($caller, 'class');
	$function = idx($caller, 'function');

	if ($class) {
	parent::__construct(
	pht('Method %s in class %s is not implemented!', $function, $class));
	} else {
	parent::__construct(pht('Function %s is not implemented!', $function));
	}
	}
	}

	}