On 24 March 2010 12:06, Peter Lind <peter.e.lind@xxxxxxxxx> wrote: > Hmmm, that looks to me like you're trying to solve a problem in PHP > with a c/c++c/# overloading solution. I'd give the builder pattern a > try instead: http://en.wikipedia.org/wiki/Builder_pattern > > On 24 March 2010 13:01, Richard Quadling <rquadling@xxxxxxxxxxxxxx> wrote: >> Hi. >> >> I have a scenario where I would _like_ to have multiple constructors >> for a class. >> >> Each constructor has a greater number of parameters than the previous one. >> >> e.g. >> >> <?php >> class myClass { >> __construct(string $Key) // use key to get the complex details. >> __construct(string $Part1, string $Part2, string $Part3) // >> Alternative route to the complex details. >> __construct(array $Complex) // All the details >> } >> >> Essentially, SimpleKey is a key to a set of predefined rules. Part1, 2 >> and 3 are the main details and well documented defaults for the rest >> of the rules. Complex is all the rules. >> >> Each constructor will end up with all the parts being known ($Key, >> $Part1, $Part2, $Part3, $Complex). >> >> But, PHP doesn't support multiple constructors. >> >> Initially I thought about this ... >> >> __construct($Key_Part1_Complex, $Part2=Null, $Part3=Null) >> >> But then documenting the first param as being 1 of three different >> meanings is pretty much a no go. >> >> So I'm looking for a clean and easily understood way to provide this. >> >> I won't be the only user of the code and not everyone has the same >> knowledge level, hence a mechanism that is easily documentable. >> >> I think I may need a factory with multiple methods (FactoryKey, >> FactoryPart1To3, FactoryComplex). Make the factory a static/singleton. >> All these methods eventually call the real class with the complex >> rule. >> >> Is that obvious enough? >> >> Regards, >> >> Richard. >> >> >> -- >> ----- >> Richard Quadling >> "Standing on the shoulders of some very clever giants!" >> EE : http://www.experts-exchange.com/M_248814.html >> EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp >> Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 >> ZOPA : http://uk.zopa.com/member/RQuadling >> >> -- >> PHP General Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> >> > > > > -- > <hype> > WWW: http://plphp.dk / http://plind.dk > LinkedIn: http://www.linkedin.com/in/plind > Flickr: http://www.flickr.com/photos/fake51 > BeWelcome: Fake51 > Couchsurfing: Fake51 > </hype> > I'm not building different types of "pizza". Just the same pizza via different routes. Along the lines of ... Pizza = new Pizza('MyFavouritePizza') // A ham+pineapple+cheese pizza. Pizza = new Pizza('ham', 'pineapple', 'cheese'); // A generic ham+pineapple+cheese pizza Pizza = new Pizza(array('base' => 'thin', 'toppings' => array('ham', 'pineapple'), 'cheese'=>true)); // A complex description. I suppose the interfaces are beginner, intermediate and advanced, but ultimately all generate identical objects. Richard. -- ----- Richard Quadling "Standing on the shoulders of some very clever giants!" EE : http://www.experts-exchange.com/M_248814.html EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731 ZOPA : http://uk.zopa.com/member/RQuadling -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
