better-testing

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;
			}
			}