89 lines
2.3 KiB
PHP
89 lines
2.3 KiB
PHP
<?php
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namespace Goodby\CSV\Export\Standard\Collection;
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use Iterator;
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use IteratorAggregate;
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class CallbackCollection implements Iterator
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{
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private $callable;
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private $data;
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public function __construct($data, $callable)
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{
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$this->callable = $callable;
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if (!is_callable($callable)) {
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throw new \InvalidArgumentException('the second argument must be callable');
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}
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if (is_array($data)) {
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$ao = new \ArrayObject($data);
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$this->data = $ao->getIterator();
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} elseif ($data instanceof Iterator) {
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$this->data = $data;
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} elseif ($data instanceof IteratorAggregate) {
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$this->data = $data->getIterator();
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} else {
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throw new \InvalidArgumentException('data must be an array or an Iterator/IteratorAggregate');
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}
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}
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/**
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* (PHP 5 >= 5.0.0)<br/>
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* Return the current element
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* @link http://php.net/manual/en/iterator.current.php
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* @return mixed Can return any type.
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*/
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public function current()
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{
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return call_user_func($this->callable, $this->data->current());
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}
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/**
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* (PHP 5 >= 5.0.0)<br/>
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* Move forward to next element
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* @link http://php.net/manual/en/iterator.next.php
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* @return void Any returned value is ignored.
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*/
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public function next()
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{
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$this->data->next();
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}
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/**
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* (PHP 5 >= 5.0.0)<br/>
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* Return the key of the current element
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* @link http://php.net/manual/en/iterator.key.php
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* @return mixed scalar on success, or null on failure.
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*/
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public function key()
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{
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return $this->data->key();
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}
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/**
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* (PHP 5 >= 5.0.0)<br/>
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* Checks if current position is valid
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* @link http://php.net/manual/en/iterator.valid.php
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* @return boolean The return value will be casted to boolean and then evaluated.
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* Returns true on success or false on failure.
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*/
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public function valid()
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{
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return $this->data->valid();
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}
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/**
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* (PHP 5 >= 5.0.0)<br/>
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* Rewind the Iterator to the first element
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* @link http://php.net/manual/en/iterator.rewind.php
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* @return void Any returned value is ignored.
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*/
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public function rewind()
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{
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$this->data->rewind();
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}
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}
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