FilesCollection.php
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	<?php

	/**
	* _, __, _, _ __, _ _, _, _
	* / \ \|_) (_ \| \| \ \| /_\ \|\ \|
	* \ / \|_) , ) \| \|_/ \| \| \| \| \\|
	* ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
	*
	* Files Collection class
	*
	* @package ObsidianWorkspaces
	* @subpackage Collection
	* @author Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
	* @license http://www.opensource.org/licenses/bsd-license.php BSD
	* @filesource
	*/

	/**
	* Files Collection class
	*
	* This class repreesnts a collection of documents, stored on the filesystem.
	*/
	class FilesCollection extends Collection {
	///
	/// Helper methods
	///

	/**
	* Gets the path to the folder where the specified collection id is stored.
	*
	* @param string $collectionId The collection identifiant
	* @return string The path to the specified collection folder
	*/
	public static function getCollectionPath ($collectionId) {
	global $Config;
	if (!array_key_exists('DocumentStorage', $Config) \|\| !array_key_exists('Path', $Config['DocumentStorage'])) {
	throw new Exception("Configuration parameter missing: \$Config['DocumentStorage']['Path']. Expected value for this parameter is the path to the collections folders.");
	}
	$path = $Config['DocumentStorage']['Path'] . DIRECTORY_SEPARATOR . $collectionId;

	//Ensure directory exists. If not, creates it or throws an exception
	if (!file_exists($path) && !mkdir($path, 0700, true)) {
	throw new Exception("Directory doesn't exist and couldn't be created: $path");
	}

	return $path;
	}

	/**
	* Gets the path to the folder where the specified collection id is stored.
	*
	* @param string $documentId The document identifiant
	* @return string The path to the specified document file
	*/
	public function getDocumentPath ($documentId) {
	return static::getCollectionPath($this->id) . DIRECTORY_SEPARATOR . $documentId . '.json';
	}

	///
	/// Constructor
	///

	/**
	* Initializes a new instance of MongoCollection
	*
	* @param string the database identifiant
	*/
	public function __construct ($id) {
	$this->id = $id;
	}

	///
	/// CRUD features
	///

	/**
	* Adds a document to the collection
	*
	* @param CollectionDocument $document The document to add
	* @return boolean true if the operation succeeded; otherwise, false.
	*/
	public function add (CollectionDocument &$document) {
	if ($document->id === '') {
	$document->id = uniqid();
	}

	$filename = $this->getDocumentPath($document->id);
	if (file_exists($filename)) {
	throw new Exception("A document with the same identifiant is already in the collection, stored at $filename");
	}

	$data = json_encode($document);

	file_put_contents($filename, $data);
	}

	/**
	* Deletes a document from the collection
	*
	* @param string $documentId The identifiant of the document to delete
	* @return boolean true if the operation succeeded; otherwise, false.
	*/
	public function delete ($documentId) {
	$filename = $this->getDocumentPath($documentId);
	unlink($filename);
	}

	/**
	* Determines if a document exists
	*
	* @param CollectionDocument $document The document to check
	* @return boolean true if the document exists; otherwise, false.
	*/
	public function exists (CollectionDocument $document) {
	$filename = $this->getDocumentPath($document->id);
	return file_exists($filename);
	}

	/**
	* Updates a document in the collection
	*
	* @param CollectionDocument $document The document to update
	* @return boolean true if the operation succeeded; otherwise, false.
	*/
	public function update (CollectionDocument &$document) {
	if ($document->id === '') {
	$document->id = uniqid();
	user_error("An ID were expected for an update operation, but not provided. We'll use $document->id.", E_USER_WARNING);
	}

	$filename = $this->getDocumentPath($document->id);
	if (!file_exists($filename)) {
	user_error("File $filename doesn't exist. The update operation has became an insert one.", E_USER_WARNING);
	}

	$data = json_encode($document);

	file_put_contents($filename, $data);
	}

	/**
	* Gets a document from the collection
	*
	* @param string $documentId The identifiant of the document to get
	* @param CollectionDocument $document The document
	*/
	public function get ($documentId) {
	$type = $this->documentType;
	if (!class_exists($type)) {
	throw new Exception("Can't create an instance of $type. If the class exists, did you registered a SPL autoloader or updated includes/autoload.php?");
	}

	$filename = $this->getDocumentPath($documentId);
	$data = json_decode(file_get_contents($filename));
	return $type::loadFromObject($data);
	}

	/**
	* Adds or updates a document in the collection
	*
	* @param CollectionDocument $document The document to set
	* @return boolean true if the operation succeeded; otherwise, false.
	*/
	public function set (CollectionDocument &$document) {
	if ($document->id === '') {
	$document->id = uniqid();
	}
	$filename = $this->getDocumentPath($document->id);
	$data = json_encode($document);
	file_put_contents($filename, $data);
	}
	}

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