File Server/Resource/CompositeResourceStore.php

1:	<?php
2:
3:	declare(strict_types=1);
4:
5:	/**
6:	* This file is part of the Nexus MCP SDK package.
7:	*
8:	* (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com>
9:	*
10:	* For the full copyright and license information, please view
11:	* the LICENSE file that was distributed with this source code.
12:	*/
13:
14:	namespace Nexus\Mcp\Server\Resource;
15:
16:	use Nexus\Mcp\Core\Schema\Cursor;
17:	use Nexus\Mcp\Core\Schema\Result\InputRequiredResult;
18:	use Nexus\Mcp\Core\Schema\Result\ListResourcesResult;
19:	use Nexus\Mcp\Core\Schema\Result\ReadResourceResult;
20:	use Nexus\Mcp\Server\Exception\ResourceNotFoundException;
21:	use Nexus\Mcp\Server\ListChangeSourceInterface;
22:	use Nexus\Mcp\Server\ServerContext;
23:
24:	/**
25:	* Chains a primary `ResourceStoreInterface` (exact-URI matches) with a fallback
26:	* `ResourceTemplateStoreInterface` (URI-template matches). `read()` tries the
27:	* primary first. On `ResourceNotFoundException` it falls through to the template
28:	* store, only re-raising the not-found when neither side matches. `list()`
29:	* delegates to the primary unchanged.
30:	*/
31:	final readonly class CompositeResourceStore implements ListChangeSourceInterface, ResourceStoreInterface
32:	{
33:	public function __construct(private ResourceStoreInterface $resourceStore, private ResourceTemplateStoreInterface $resourceTemplateStore)
34:	{
35:	}
36:
37:	#[\Override]
38:	public function onListChanged(\Closure $listener): void
39:	{
40:	foreach ([$this->resourceStore, $this->resourceTemplateStore] as $store) {
41:	if ($store instanceof ListChangeSourceInterface) {
42:	$store->onListChanged($listener);
43:	}
44:	}
45:	}
46:
47:	#[\Override]
48:	public function list(?Cursor $cursor): ListResourcesResult
49:	{
50:	return $this->resourceStore->list($cursor);
51:	}
52:
53:	#[\Override]
54:	public function read(string $uri, ServerContext $context): InputRequiredResult\|ReadResourceResult
55:	{
56:	try {
57:	return $this->resourceStore->read($uri, $context);
58:	} catch (ResourceNotFoundException) {
59:	return $this->resourceTemplateStore->read($uri, $context);
60:	}
61:	}
62:	}
63:

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