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Field.php
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	<?php

	namespace RESTful;

	class Field
	{
	public $name;

	public function __construct($name)
	{
	$this->name = $name;
	}

	public function __get($name)
	{
	return new Field($this->name . '.' . $name);
	}

	public function in($vals)
	{
	return new FilterExpression($this->name, 'in', $vals, '!in');
	}

	public function startswith($prefix)
	{
	if (!is_string($prefix)) {
	throw new \InvalidArgumentException('"startswith" prefix must be a string');
	}

	return new FilterExpression($this->name, 'contains', $prefix);
	}

	public function endswith($suffix)
	{
	if (!is_string($suffix)) {
	throw new \InvalidArgumentException('"endswith" suffix must be a string');
	}

	return new FilterExpression($this->name, 'contains', $suffix);
	}

	public function contains($fragment)
	{
	if (!is_string($fragment)) {
	throw new \InvalidArgumentException('"contains" fragment must be a string');
	}

	return new FilterExpression($this->name, 'contains', $fragment, '!contains');
	}

	public function eq($val)
	{
	return new FilterExpression($this->name, '=', $val, '!eq');
	}

	public function lt($val)
	{
	return new FilterExpression($this->name, '<', $val, '>=');
	}

	public function lte($val)
	{
	return new FilterExpression($this->name, '<=', $val, '>');
	}

	public function gt($val)
	{
	return new FilterExpression($this->name, '>', $val, '<=');
	}

	public function gte($val)
	{
	return new FilterExpression($this->name, '>=', $val, '<');
	}

	public function asc()
	{
	return new SortExpression($this->name, true);
	}

	public function desc()
	{
	return new SortExpression($this->name, false);
	}
	}