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<?php |
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/** |
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* Copyright (C) 2019-2022 Graham Breach |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* For more information, please contact <graham@goat1000.com> |
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*/ |
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|
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namespace Goat1000\SVGGraph; |
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|
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/** |
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* For iterating over structured data |
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*/ |
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class StructuredDataIterator implements \Iterator { |
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|
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private $data = 0; |
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private $dataset = 0; |
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private $position = 0; |
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private $count = 0; |
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private $structure = null; |
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private $key_field = 0; |
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private $dataset_fields = []; |
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|
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public function __construct(&$data, $dataset, $structure) |
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{ |
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$this->dataset = $dataset; |
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$this->data =& $data; |
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$this->count = count($data); |
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$this->structure = $structure; |
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|
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$this->key_field = $structure['key']; |
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$this->dataset_fields = $structure['value']; |
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} |
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|
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#[\ReturnTypeWillChange] |
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public function current() |
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{ |
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return $this->getItemByIndex($this->position); |
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} |
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|
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#[\ReturnTypeWillChange] |
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public function key() |
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{ |
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return $this->position; |
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} |
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|
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#[\ReturnTypeWillChange] |
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public function next() |
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{ |
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++$this->position; |
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} |
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|
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#[\ReturnTypeWillChange] |
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public function rewind() |
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{ |
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$this->position = 0; |
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} |
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|
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#[\ReturnTypeWillChange] |
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public function valid() |
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{ |
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return $this->position < $this->count; |
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} |
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|
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/** |
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* Returns an item by index |
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*/ |
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public function getItemByIndex($index) |
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{ |
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if(isset($this->data[$index])) { |
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$key = $this->key_field === null ? $index : null; |
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return new StructuredDataItem($this->data[$index], |
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$this->structure, $this->dataset, $key); |
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} |
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return null; |
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} |
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|
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/** |
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* Returns an item by key |
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*/ |
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public function getItemByKey($key) |
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{ |
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if($this->key_field === null) { |
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if(isset($this->data[$key])) |
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return new StructuredDataItem($this->data[$key], $this->structure, |
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$this->dataset, $key); |
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return null; |
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} |
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|
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foreach($this->data as $item) |
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if(isset($item[$this->key_field]) && $item[$this->key_field] == $key) |
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return new StructuredDataItem($item, $this->structure, |
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$this->dataset, $key); |
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return null; |
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} |
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} |
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|
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|
