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<?php |
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/* |
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* This file is part of the kaloa/util package. |
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* |
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* For full copyright and license information, please view the LICENSE file |
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* that was distributed with this source code. |
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*/ |
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namespace Kaloa\Util\Tree; |
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use Closure; |
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/** |
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* A simple tree structure |
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* |
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* There will always be a single distinct root node |
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*/ |
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final class Node |
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{ |
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private $content = null; |
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private $children = array(); |
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private $parent = null; |
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public function __construct($value) |
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{ |
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$this->content = $value; |
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} |
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public function addChild(Node $child) |
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{ |
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$this->children[] = $child; |
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$child->setParent($this); |
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} |
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public function hasChildren() |
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{ |
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return (count($this->children) > 0); |
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} |
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public function setParent(Node $node) |
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{ |
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$this->parent = $node; |
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} |
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public function getParent() |
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{ |
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return $this->parent; |
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} |
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public function getChildren() |
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{ |
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return $this->children; |
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} |
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public function getContent() |
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{ |
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return $this->content; |
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} |
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/** |
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* Displays all elements from a tree in hierarchic order |
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* |
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* @param int $level Current level of indentation |
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*/ |
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public function display($level = 0) |
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{ |
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$value = $this->getContent(); |
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if (null === $value) { |
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$value = 'null'; |
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} elseif (is_object($value)) { |
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$value = get_class($value); |
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} elseif (is_array($value)) { |
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$value = 'Array'; |
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} |
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$ret = str_repeat(' ', $level * 4) . $value . "\n"; |
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$children = $this->getChildren(); |
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foreach ($children as $child) { |
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$ret .= $child->display($level + 1); |
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} |
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return $ret; |
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} |
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/** |
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* |
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* @param Closure $expr |
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* @return array |
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*/ |
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public function getNodesByFilter(Closure $expr) |
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{ |
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$nodes = array(); |
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foreach ($this->children as $child) { |
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if ($expr($child->getContent())) { |
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$nodes[] = $child; |
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} |
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foreach ($child->getNodesByFilter($expr) as $node) { |
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$nodes[] = $node; |
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} |
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} |
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return $nodes; |
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} |
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} |
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mermshaus /
kaloa-util
