SpgrContainer.php

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<?php
class PHPExcel_Shared_Escher_DgContainer_SpgrContainer
{
        private $_parent;

        private $_children = array();

        public function setParent($parent)
        {
                $this->_parent = $parent;
        }

        public function getParent()
        {
                return $this->_parent;
        }

        public function addChild($child)
        {
                $this->_children[] = $child;
                $child->setParent($this);
        }

        public function getChildren()
        {
                return $this->_children;
        }

        public function getAllSpContainers()
        {
                $allSpContainers = array();

                foreach ($this->_children as $child) {
                        if ($child instanceof PHPExcel_Shared_Escher_DgContainer_SpgrContainer) {
                                $allSpContainers = array_merge($allSpContainers, $child->getAllSpContainers());
                        } else {
                                $allSpContainers[] = $child;
                        }
                }

                return $allSpContainers;
        }
}