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POIs changing an objects state/contents appropriate Iterator usage (php)
 

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  1. POIs changing an objects state/contents appropriate Iterator usage (php)
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    <p>Consider an object used to store a collection of items, but that collection may vary depending on predefined contexts.</p> <pre><code>Class Container implements IteratorAggregate ( protected $contexts; // list of associated contexts, example: array(0=&gt;1,1=&gt;3) protected $contents; // array public loadContents( $contextId ) { /* populates $this-&gt;contents*/ } public getContexts() { /* populates $this-&gt;contexts */ } ... public function getIterator() { return new ArrayIterator($this-&gt;contents); } public getContextIterator() { return new contextIterator($this); } } </code></pre> <p>The iterator looks like:</p> <pre><code>Class contextIterator { protected $container; protected $contexts; protected $currentContext; public function __construct($container) { $this-&gt;container = $container; $this-&gt;contexts = $container-&gt;getContexts(); $this-&gt;currentContext = 0; } public current() { $this-&gt;container-&gt;loadContents( $this-&gt;key() ); return $this-&gt;contexts[ $this-&gt;key() ]; } public function key() { return $this-&gt;currentContext; } public function next() { $this-&gt;currentContext++; } public function rewind() { $this-&gt;currentContext = 0; } public function valid() { return isset( $this-&gt;contexts[ $this-&gt;key() ] ); } } </code></pre> <p>For the few cases where each context needs to be examined iteratively, I do the following:</p> <pre><code>$myContainer = new Container(); foreach( $myContainer-&gt;getContextIterator() as $key =&gt; $value ) { $myContainer-&gt;someMethod(); } </code></pre> <p>The above is nice and compact, but it feels dirty to me since I'm never actually using $key or $value. Is using the iterator overkill? Further, should an iterator ever change the state/contents of the object it is iterating?</p>
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    1. CO`return $this->steps[ $this->key() ];` - where is `steps` declared? with full code it will be more easy to answer.
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    2. COwhoops, sorry about that. The property "steps" should of been "contexts". I edited my question. Do you still need more info?
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    3. COI really don't get what your trying to accomplish here. Is this something that you are used to doing in other languages? I feel stupid for even having to ask this because I am sure there are more experienced programmers that are going to groan at my ignorance here.
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