Upgrade to some new nextcloud standards

lib/Service/NotFoundException.php

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+<?php
+namespace OCA\QuickNotes\Service;
+
+class NotFoundException extends ServiceException {}

lib/Service/NoteService.php

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+<?php
+namespace OCA\QuickNotes\Service;
+
+use Exception;
+
+use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\MultipleObjectsReturnedException;
+
+use OCA\OwnNotes\Db\Note;
+use OCA\OwnNotes\Db\NoteMapper;
+
+
+class NoteService {
+
+	private $mapper;
+
+	public function __construct(NoteMapper $mapper){
+		$this->mapper = $mapper;
+	}
+
+	public function findAll($userId) {
+		return $this->mapper->findAll($userId);
+	}
+
+	private function handleException ($e) {
+		if ($e instanceof DoesNotExistException ||
+			$e instanceof MultipleObjectsReturnedException) {
+			throw new NotFoundException($e->getMessage());
+		} else {
+			throw $e;
+		}
+	}
+
+	public function find($id, $userId) {
+		try {
+			return $this->mapper->find($id, $userId);
+
+			// in order to be able to plug in different storage backends like files
+			// for instance it is a good idea to turn storage related exceptions
+			// into service related exceptions so controllers and service users
+			// have to deal with only one type of exception
+		} catch(Exception $e) {
+			$this->handleException($e);
+		}
+	}
+
+	public function create($title, $content, $color = "#F7EB96", $userId) {
+		$note = new Note();
+		$note->setTitle($title);
+		$note->setContent($content);
+		$note->setColor($color);
+		$note->setUserId($userId);
+		return $this->mapper->insert($note);
+	}
+
+	public function update($id, $title, $content, $color = "#F7EB96", $userId) {
+		try {
+			$note = $this->mapper->find($id, $userId);
+			$note->setTitle($title);
+			$note->setContent($content);
+			$note->setColor($color);
+			return $this->mapper->update($note);
+		} catch(Exception $e) {
+			$this->handleException($e);
+		}
+	}
+
+	public function delete($id, $userId) {
+		try {
+			$note = $this->mapper->find($id, $userId);
+			$this->mapper->delete($note);
+			return $note;
+		} catch(Exception $e) {
+			$this->handleException($e);
+		}
+	}
+}

lib/Service/ServiceException.php

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+<?php
+namespace OCA\QuickNotes\Service;
+
+use Exception;
+
+class ServiceException extends Exception {}