FilterExpression.php
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FilterExpression.php
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	<?php

	namespace RESTful;

	class FilterExpression
	{
	public $field,
	$op,
	$val,
	$not_op;

	public function __construct($field, $op, $val, $not_op = null)
	{
	$this->field = $field;
	$this->op = $op;
	$this->val = $val;
	$this->not_op = $not_op;
	}

	public function not()
	{
	if (null === $this->not_op) {
	throw new \LogicException(sprintf('Filter cannot be inverted'));
	}
	$temp = $this->op;
	$this->op = $this->not_op;
	$this->not_op = $temp;

	return $this;
	}
	}