FEATURE: Add ContentSubgraphInterface::findClosestNode()

Neos.ContentGraph.DoctrineDbalAdapter/src/Domain/Repository/ContentSubgraph.php

@@ -34,6 +34,7 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindAncestorNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindBackReferencesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindChildNodesFilter;
+use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindClosestNodeFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindDescendantNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindPrecedingSiblingNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindReferencesFilter;
@@ -355,6 +356,50 @@ public function countAncestorNodes(NodeAggregateId $entryNodeAggregateId, CountA
         );
     }
 
+    public function findClosestNode(NodeAggregateId $entryNodeAggregateId, FindClosestNodeFilter $filter): ?Node
+    {
+        $queryBuilderInitial = $this->createQueryBuilder()
+            ->select('n.*, ph.name, ph.contentstreamid, ph.parentnodeanchor')
+            ->from($this->tableNamePrefix . '_node', 'n')
+            // we need to join with the hierarchy relation, because we need the node name.
+            ->innerJoin('n', $this->tableNamePrefix . '_hierarchyrelation', 'ph', 'n.relationanchorpoint = ph.childnodeanchor')
+            ->andWhere('ph.contentstreamid = :contentStreamId')
+            ->andWhere('ph.dimensionspacepointhash = :dimensionSpacePointHash')
+            ->andWhere('n.nodeaggregateid = :entryNodeAggregateId');
+        $this->addRestrictionRelationConstraints($queryBuilderInitial, 'n', 'ph');
+
+        $queryBuilderRecursive = $this->createQueryBuilder()
+            ->select('p.*, h.name, h.contentstreamid, h.parentnodeanchor')
+            ->from('ancestry', 'c')
+            ->innerJoin('c', $this->tableNamePrefix . '_node', 'p', 'p.relationanchorpoint = c.parentnodeanchor')
+            ->innerJoin('p', $this->tableNamePrefix . '_hierarchyrelation', 'h', 'h.childnodeanchor = p.relationanchorpoint')
+            ->where('h.contentstreamid = :contentStreamId')
+            ->andWhere('h.dimensionspacepointhash = :dimensionSpacePointHash');
+        $this->addRestrictionRelationConstraints($queryBuilderRecursive, 'p');
+
+        $queryBuilderCte = $this->createQueryBuilder()
+            ->select('*')
+            ->from('ancestry', 'p')
+            ->setMaxResults(1)
+            ->setParameter('contentStreamId', $this->contentStreamId->value)
+            ->setParameter('dimensionSpacePointHash', $this->dimensionSpacePoint->hash)
+            ->setParameter('entryNodeAggregateId', $entryNodeAggregateId->value);
+        if ($filter->nodeTypeConstraints !== null) {
+            $this->addNodeTypeConstraints($queryBuilderCte, $filter->nodeTypeConstraints, 'p');
+        }
+        $nodeRows = $this->fetchCteResults(
+            $queryBuilderInitial,
+            $queryBuilderRecursive,
+            $queryBuilderCte,
+            'ancestry'
+        );
+        return $this->nodeFactory->mapNodeRowsToNodes(
+            $nodeRows,
+            $this->dimensionSpacePoint,
+            $this->visibilityConstraints
+        )->first();
+    }
+
     public function findDescendantNodes(NodeAggregateId $entryNodeAggregateId, FindDescendantNodesFilter $filter): Nodes
     {
         ['queryBuilderInitial' => $queryBuilderInitial, 'queryBuilderRecursive' => $queryBuilderRecursive, 'queryBuilderCte' => $queryBuilderCte] = $this->buildDescendantNodesQueries($entryNodeAggregateId, $filter);
@@ -666,7 +711,7 @@ private function buildSiblingsQuery(bool $preceding, NodeAggregateId $siblingNod
     /**
      * @return array{queryBuilderInitial: QueryBuilder, queryBuilderRecursive: QueryBuilder, queryBuilderCte: QueryBuilder}
      */
-    private function buildAncestorNodesQueries(NodeAggregateId $entryNodeAggregateId, FindAncestorNodesFilter|CountAncestorNodesFilter $filter): array
+    private function buildAncestorNodesQueries(NodeAggregateId $entryNodeAggregateId, FindAncestorNodesFilter|CountAncestorNodesFilter|FindClosestNodeFilter $filter): array
     {
         $queryBuilderInitial = $this->createQueryBuilder()
             ->select('n.*, ph.name, ph.contentstreamid, ph.parentnodeanchor')

Neos.ContentGraph.PostgreSQLAdapter/src/Domain/Repository/ContentSubhypergraph.php

@@ -31,6 +31,7 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindBackReferencesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindChildNodesFilter;
+use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindClosestNodeFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindDescendantNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindPrecedingSiblingNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindReferencesFilter;
@@ -457,6 +458,13 @@ public function countAncestorNodes(
         return 0;
     }
 
+    public function findClosestNode(
+        NodeAggregateId $entryNodeAggregateId,
+        FindClosestNodeFilter $filter
+    ): ?Node {
+        return null;
+    }
+
     public function findDescendantNodes(
         NodeAggregateId $entryNodeAggregateId,
         FindDescendantNodesFilter $filter

Neos.ContentRepository.BehavioralTests/Tests/Behavior/Features/NodeTraversal/ClosestNode.feature

@@ -0,0 +1,98 @@
+@contentrepository @adapters=DoctrineDBAL
+  # TODO implement for Postgres
+Feature: Find nodes using the findClosestNode query
+
+  Background:
+    Given using the following content dimensions:
+      | Identifier | Values          | Generalizations      |
+      | language   | mul, de, en, ch | ch->de->mul, en->mul |
+    And using the following node types:
+    """yaml
+    'Neos.ContentRepository:Root': []
+    'Neos.ContentRepository.Testing:AbstractPage':
+      abstract: true
+    'Neos.ContentRepository.Testing:SomeMixin':
+      abstract: true
+    'Neos.ContentRepository.Testing:Homepage':
+      superTypes:
+        'Neos.ContentRepository.Testing:AbstractPage': true
+      childNodes:
+        terms:
+          type: 'Neos.ContentRepository.Testing:Terms'
+        contact:
+          type: 'Neos.ContentRepository.Testing:Contact'
+
+    'Neos.ContentRepository.Testing:Terms':
+      superTypes:
+        'Neos.ContentRepository.Testing:AbstractPage': true
+      properties:
+        text:
+          defaultValue: 'Terms default'
+    'Neos.ContentRepository.Testing:Contact':
+      superTypes:
+        'Neos.ContentRepository.Testing:AbstractPage': true
+        'Neos.ContentRepository.Testing:SomeMixin': true
+      properties:
+        text:
+          defaultValue: 'Contact default'
+    'Neos.ContentRepository.Testing:Page':
+      superTypes:
+        'Neos.ContentRepository.Testing:AbstractPage': true
+    'Neos.ContentRepository.Testing:SpecialPage':
+      superTypes:
+        'Neos.ContentRepository.Testing:AbstractPage': true
+    """
+    And using identifier "default", I define a content repository
+    And I am in content repository "default"
+    And I am user identified by "initiating-user-identifier"
+    And the command CreateRootWorkspace is executed with payload:
+      | Key                  | Value                |
+      | workspaceName        | "live"               |
+      | workspaceTitle       | "Live"               |
+      | workspaceDescription | "The live workspace" |
+      | newContentStreamId   | "cs-identifier"      |
+    And the graph projection is fully up to date
+    And I am in content stream "cs-identifier" and dimension space point {"language":"de"}
+    And the command CreateRootNodeAggregateWithNode is executed with payload:
+      | Key             | Value                         |
+      | nodeAggregateId | "lady-eleonode-rootford"      |
+      | nodeTypeName    | "Neos.ContentRepository:Root" |
+    And the graph projection is fully up to date
+    And the following CreateNodeAggregateWithNode commands are executed:
+      | nodeAggregateId | nodeName | nodeTypeName                               | parentNodeAggregateId  | initialPropertyValues | tetheredDescendantNodeAggregateIds       |
+      | home            | home     | Neos.ContentRepository.Testing:Homepage    | lady-eleonode-rootford | {}                    | {"terms": "terms", "contact": "contact"} |
+      | a               | a        | Neos.ContentRepository.Testing:Page        | home                   | {}                    | {}                                       |
+      | a1              | a1       | Neos.ContentRepository.Testing:Page        | a                      | {}                    | {}                                       |
+      | a2              | a2       | Neos.ContentRepository.Testing:Page        | a                      | {}                    | {}                                       |
+      | a2a             | a2a      | Neos.ContentRepository.Testing:SpecialPage | a2                     | {}                    | {}                                       |
+      | a2a1            | a2a1     | Neos.ContentRepository.Testing:Page        | a2a                    | {}                    | {}                                       |
+      | a2a2            | a2a2     | Neos.ContentRepository.Testing:Page        | a2a                    | {}                    | {}                                       |
+      | a2a2a           | a2a2a    | Neos.ContentRepository.Testing:Page        | a2a2                   | {}                    | {}                                       |
+      | a2a2b           | a2a2b    | Neos.ContentRepository.Testing:Page        | a2a2                   | {}                    | {}                                       |
+      | a2b             | a2b      | Neos.ContentRepository.Testing:Page        | a2                     | {}                    | {}                                       |
+      | a2b1            | a2b1     | Neos.ContentRepository.Testing:Page        | a2b                     | {}                    | {}                                       |
+      | b               | b        | Neos.ContentRepository.Testing:Page        | home                   | {}                    | {}                                       |
+    And the command DisableNodeAggregate is executed with payload:
+      | Key                          | Value         |
+      | nodeAggregateId              | "a2a2a"       |
+      | nodeVariantSelectionStrategy | "allVariants" |
+    And the graph projection is fully up to date
+    And the command DisableNodeAggregate is executed with payload:
+      | Key                          | Value         |
+      | nodeAggregateId              | "a2b"        |
+      | nodeVariantSelectionStrategy | "allVariants" |
+    And the graph projection is fully up to date
+
+  Scenario:
+    # findClosestNode queries without results
+#    When I execute the findClosestNode query for entry node aggregate id "non-existing" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:Page"}' I expect no node to be returned
+#    # a2a2a is disabled
+#    When I execute the findClosestNode query for entry node aggregate id "a2a2a" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:Page"}' I expect no node to be returned
+#    # a2b is disabled
+#    When I execute the findClosestNode query for entry node aggregate id "a2b1" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:Page"}' I expect no node to be returned
+
+    # findClosestNode queries with results
+    When I execute the findClosestNode query for entry node aggregate id "a2a2b" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:Page"}' I expect the node "a2a2b" to be returned
+    When I execute the findClosestNode query for entry node aggregate id "a2a2b" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:SpecialPage"}' I expect the node "a2a" to be returned
+    When I execute the findClosestNode query for entry node aggregate id "a2a2b" and filter '{"nodeTypeConstraints": "!Neos.ContentRepository.Testing:Page,!Neos.ContentRepository.Testing:SpecialPage"}' I expect the node "home" to be returned
+    When I execute the findClosestNode query for entry node aggregate id "a2a" and filter '{"nodeTypeConstraints": "Neos.ContentRepository.Testing:SpecialPage"}' I expect the node "a2a" to be returned

Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentGraphWithRuntimeCaches/ContentSubgraphWithRuntimeCaches.php

@@ -227,6 +227,12 @@ public function countAncestorNodes(NodeAggregateId $entryNodeAggregateId, Filter
         return $this->wrappedContentSubgraph->countAncestorNodes($entryNodeAggregateId, $filter);
     }
 
+    public function findClosestNode(NodeAggregateId $entryNodeAggregateId, Filter\FindClosestNodeFilter $filter): ?Node
+    {
+        // TODO: Implement findClosestNode() method.
+        return $this->wrappedContentSubgraph->findClosestNode($entryNodeAggregateId, $filter);
+    }
+
     public function findDescendantNodes(NodeAggregateId $entryNodeAggregateId, FindDescendantNodesFilter $filter): Nodes
     {
         // TODO: implement runtime caches

Neos.ContentRepository.Core/Classes/Projection/ContentGraph/ContentSubgraphInterface.php

@@ -109,6 +109,14 @@ public function findAncestorNodes(NodeAggregateId $entryNodeAggregateId, Filter\
      */
     public function countAncestorNodes(NodeAggregateId $entryNodeAggregateId, Filter\CountAncestorNodesFilter $filter): int;
 
+    /**
+     * Find the closest matching node, the entry node itself or the first ancestors of the $entryNodeAggregateId, that match the specified $filter and return it
+     * Note: in contrast to {@see findAncestorNodes()} the resulting node will be the entry node if it matches the filter!
+     *
+     * @return Node|null the closest node that matches the given $filter, or NULL if no matching node was found
+     */
+    public function findClosestNode(NodeAggregateId $entryNodeAggregateId, Filter\FindClosestNodeFilter $filter): ?Node;
+
     /**
      * Recursively find all nodes underneath the $entryNodeAggregateId that match the specified $filter and return them as a flat list
      *

Neos.ContentRepository.Core/Classes/Projection/ContentGraph/Filter/FindClosestNodeFilter.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Neos\ContentRepository\Core\Projection\ContentGraph\Filter;
+
+use Neos\ContentRepository\Core\Projection\ContentGraph\NodeTypeConstraints;
+
+/**
+ * Immutable filter DTO for {@see ContentSubgraphInterface::findClosestNode()}
+ *
+ * Example:
+ *
+ * FindClosestAncestorNodeFilter::create(nodeTypeConstraints: 'Some.Included:NodeType,!Some.Excluded:NodeType');
+ *
+ * @api for the factory methods; NOT for the inner state.
+ */
+final class FindClosestNodeFilter
+{
+    /**
+     * @internal (the properties themselves are readonly; only the write-methods are API.
+     */
+    private function __construct(
+        public readonly NodeTypeConstraints $nodeTypeConstraints
+    ) {
+    }
+
+    /**
+     * Creates an instance with the specified filter options
+     *
+     * Note: The signature of this method might be extended in the future, so it should always be used with named arguments
+     * @see https://www.php.net/manual/en/functions.arguments.php#functions.named-arguments
+     */
+    public static function create(
+        NodeTypeConstraints|string $nodeTypeConstraints
+    ): self {
+        if (is_string($nodeTypeConstraints)) {
+            $nodeTypeConstraints = NodeTypeConstraints::fromFilterString($nodeTypeConstraints);
+        }
+        return new self($nodeTypeConstraints);
+    }
+}

Neos.ContentRepository.TestSuite/Classes/Behavior/Features/Bootstrap/NodeTraversalTrait.php

@@ -26,6 +26,7 @@
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindAncestorNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindBackReferencesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindChildNodesFilter;
+use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindClosestNodeFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindDescendantNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindPrecedingSiblingNodesFilter;
 use Neos\ContentRepository\Core\Projection\ContentGraph\Filter\FindReferencesFilter;
@@ -283,6 +284,19 @@ public function iExecuteTheFindAncestorNodesQueryIExpectTheFollowingNodes(string
         Assert::assertSame($expectedTotalCount ?? count($expectedNodeIds), $actualCount, 'countAncestorNodes returned an unexpected result');
     }
 
+    /**
+     * @When /^I execute the findClosestNode query for entry node aggregate id "(?<entryNodeIdSerialized>[^"]*)"(?: and filter '(?<filterSerialized>[^']*)')? I expect (?:the node "(?<expectedNodeId>[^"]*)"|no node) to be returned?$/
+     */
+    public function iExecuteTheFindClosestNodeQueryIExpectTheFollowingNodes(string $entryNodeIdSerialized, string $filterSerialized = '', string $expectedNodeId = null): void
+    {
+        $entryNodeAggregateId = NodeAggregateId::fromString($entryNodeIdSerialized);
+        $filterValues = !empty($filterSerialized) ? json_decode($filterSerialized, true, 512, JSON_THROW_ON_ERROR) : [];
+        $filter = FindClosestNodeFilter::create(...$filterValues);
+        $subgraph = $this->getCurrentSubgraph();
+        $actualNodeId = $subgraph->findClosestNode($entryNodeAggregateId, $filter)?->nodeAggregateId->value;
+        Assert::assertSame($expectedNodeId, $actualNodeId, 'findClosestNode returned an unexpected result');
+    }
+
     /**
      * @When I execute the countNodes query I expect the result to be :expectedResult
      */