On 24 March 2010 12:39, Peter Lind <peter.e.lind@xxxxxxxxx> wrote: > And how exactly does that differ from building the same pizza in > different ways? Builder doesn't mean you have to create different > objects, it means taking the complexity in building a given object or > set of objects and storing it in one place. > > In your case, it allows you to build your object in different ways > while documenting it properly and avoid the huge switch inside your > constructor that Nilesh proposed. > > On 24 March 2010 13:35, Richard Quadling <rquadling@xxxxxxxxxxxxxx> wrote: >> 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 >> > > > > -- > <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> > Aha. light bulb moment. Thank you. -- ----- 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
