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<?php declare(strict_types = 1); | |
/* | |
* Copyright (c) 2018, Josef Kufner <josef@kufner.cz> | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
*/ | |
namespace Smalldb\Graph; | |
class Node extends AbstractGraphElement | |
{ | |
/** | |
* List of edges connected to this node. | |
* | |
* The edge may in this node start, or end, or both (or more in case | |
* of hyper-edges). However, the edge is present in the list only once. | |
* | |
* @var Edge[] | |
*/ | |
private array $connectedEdges = []; | |
/** | |
* Nested graph. | |
*/ | |
private ?NestedGraph $nestedGraph = null; | |
public function __construct(NestedGraph $graph, string $id, array $attrs) | |
{ | |
parent::__construct($graph, $id, $attrs); | |
$this->getGraph()->addNode($this); | |
} | |
public function remove() | |
{ | |
$this->getGraph()->removeNode($this); | |
} | |
public function connectEdge(Edge $edge): self | |
{ | |
$id = $edge->getId(); | |
if (isset($this->connectedEdges[$id])) { | |
throw new DuplicateEdgeException(sprintf("Edge \"%s\" already connected to node \"%s\".", $id, $this->getId())); //@codeCoverageIgnore | |
} else { | |
$this->connectedEdges[$id] = $edge; | |
return $this; | |
} | |
} | |
public function disconnectEdge(Edge $edge): self | |
{ | |
$id = $edge->getId(); | |
if (isset($this->connectedEdges[$id])) { | |
unset($this->connectedEdges[$id]); | |
return $this; | |
} else { | |
throw new MissingEdgeException(sprintf("Edge \"%s\" is not connected to node \"%s\".", $id, $this->getId())); //@codeCoverageIgnore | |
} | |
} | |
/** | |
* Get list of edges connected to this node. | |
* | |
* An edge may be connected multiple times to the node, but it will | |
* be present in this list only once. | |
* | |
* @return Edge[] | |
*/ | |
public function getConnectedEdges(): array | |
{ | |
return $this->connectedEdges; | |
} | |
/** | |
* Get nested graph of this node. The graph is created if the node does not have any. | |
* | |
* @return NestedGraph | |
*/ | |
public function getNestedGraph(): NestedGraph | |
{ | |
return $this->nestedGraph !== null | |
? $this->nestedGraph | |
: ($this->nestedGraph = $this->getRootGraph()->createNestedGraph($this)); | |
} | |
/** | |
* Does the node have a nested graph? | |
*/ | |
public function hasNestedGraph(): bool | |
{ | |
return $this->nestedGraph !== null; | |
} | |
/** | |
* Handle change of an attribute. | |
*/ | |
protected function onAttrChanged(string $key, $oldValue, $newValue) | |
{ | |
$this->getGraph()->nodeAttrChanged($this, $key, $oldValue, $newValue); | |
} | |
} |