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<?php |
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declare(strict_types=1); |
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/* |
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* Copyright (C) 2019 Sebastian Böttger <[email protected]> |
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* You may use, distribute and modify this code under the |
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* terms of the MIT license. |
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* |
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* You should have received a copy of the MIT license with |
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* this file. If not, please visit: https://opensource.org/licenses/mit-license.php |
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*/ |
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namespace Seboettg\Forest; |
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use Countable; |
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use ErrorException; |
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use Seboettg\Collection\Stack; |
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use Seboettg\Forest\General\TreeNode; |
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use Seboettg\Forest\General\TreeNodeInterface; |
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use Seboettg\Forest\General\TreeTraversalInterface; |
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use Seboettg\Forest\General\TreeTraversalTrait; |
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/** |
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* Class Builder |
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* @package Seboettg\Forest |
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*/ |
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class GeneralTree implements Countable, TreeTraversalInterface |
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{ |
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use TreeTraversalTrait; |
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/** |
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* @var Stack |
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*/ |
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private $treeNodeStack; |
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/** |
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* @var string |
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*/ |
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private $itemType; |
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/** |
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* @var int |
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*/ |
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private $elementCount = 0; |
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/** |
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* @var TreeNodeInterface |
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*/ |
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private $root; |
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/** |
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* GeneralTree constructor. |
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* @param string $itemType |
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* @throws ErrorException |
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*/ |
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public function __construct(string $itemType) |
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{ |
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if (!class_exists($itemType)) { |
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throw new ErrorException("Could not find class $itemType"); |
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} |
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$this->itemType = $itemType; |
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} |
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/** |
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* @param mixed $value |
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* @return GeneralTree |
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*/ |
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public function root($value) |
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{ |
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$this->treeNodeStack = new Stack(); |
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$this->root = $this->nodeFactory($value); |
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$this->treeNodeStack->push($this->root); |
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return $this; |
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} |
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/** |
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* Add a child to the node enter in its scope |
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* |
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* @param mixed $value |
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* @return GeneralTree |
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*/ |
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public function subTree($value) |
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{ |
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$node = $this->nodeFactory($value); |
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$this->treeNodeStack->peek()->addChild($node); |
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$this->treeNodeStack->push($node); |
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return $this; |
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} |
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/** |
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* @param mixed $value |
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* @return GeneralTree |
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*/ |
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public function child($value) |
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{ |
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$node = $this->nodeFactory($value); |
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$this->treeNodeStack->peek()->addChild($node); |
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return $this; |
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} |
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/** |
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* @return GeneralTree |
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*/ |
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public function endSubTree() |
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{ |
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$this->treeNodeStack->pop(); |
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return $this; |
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} |
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/** |
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* @param mixed $value |
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* @return TreeNodeInterface |
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*/ |
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protected function nodeFactory($value): TreeNodeInterface |
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{ |
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++$this->elementCount; |
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if (is_object($value) && get_class($value) === $this->itemType) { |
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return new TreeNode($value); |
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} |
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$item = new $this->itemType($value); |
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return new TreeNode($item); |
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} |
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/** |
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* @return TreeNodeInterface |
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*/ |
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2 |
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public function getNode(): ?TreeNodeInterface |
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{ |
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return $this->treeNodeStack->peek(); |
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} |
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/** |
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* @return TreeNodeInterface |
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*/ |
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final public function getRoot(): ?TreeNodeInterface |
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{ |
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return $this->root; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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1 |
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final public function count(): int |
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{ |
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1 |
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return $this->elementCount; |
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} |
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} |
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seboettg /
Forest
