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PODesign Patterns Recommendation for Filtering Option
 

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    <p>I am thinking to create a filter object which filters and delete everything like html tags from a context. But I want it to be independent which means the design pattern I can apply will help me to add more filters in the future without effecting the current codes. I thought Abstract Factory but it seems it ain't gonna work out the way I want. So maybe builder but it looks same. I don't know I am kinda confused, some one please recommend me a design pattern which can solve my problem but before that let me elaborate the problem a little bit.</p> <p>Lets say I have a class which has Description field or property what ever. And I need filters which remove the things I want from this Description property. So whenever I apply the filter I can add more filter in underlying tier. So instead of re-touching the Description field, I can easily add more filters and all the filters will run for Description field and delete whatever they are supposed to delete from the Description context.</p> <p>I hope I could describe my problem. I think some of you ran into the same situation before.</p> <p>Thanks in advance...</p> <p><strong>Edit :</strong> </p> <p>I actually want to create filters as types/classes instead of regular methods or whatever. Like :</p> <pre><code>class TextFilter : IFilter { private string something; public string Awesome {get;set;} public string FilterYo(string textFiltered) { // Do filtering } } class HtmlFilter : IFilter { private string something; private string iGotSomething; public string Awesome {get;set;} public string FilterYo(string textFiltered) { // Do filtering } } class Main { protected void Main(object sender, EventArgs e) { InputClass input = new InputClass(); string filtered = new StartFiltering().Filter(input.Description); // at this moment, my input class shouldn't know anything about filters or something. I don't know if it makes any sense but this is what in my mind. } } </code></pre> <p>At this point if I want to apply Abstract Factory which would be meaningless or Builder as well. Because I don't want a particular thing, I need all of them kinda.</p> <p>Thanks for your answers by the way.</p> <p><strong>Edit 2 - Possible Answer for Me</strong></p> <p>Okay lets think about strategy pattern with interfaces rather than delegates.</p> <pre><code>interface IFilter //Strategy interface { string Filter(string text); } class LinkFilter:IFilter //Strategy concrete class { public string Filter(string text) { //filter link tags and return pure text; } } class PictureFilter:IFilter //Strategy concrete class { public string Filter(string text) { //filter links and return pure text; } } class Context { private IFilter _filter; private string _text; public Context(IFilter filter,string text) { this._filter = filter; this._text = text; } public void UpdateFilter(IFilter filter) { this._filter = filter; } public string RunFilter() { this._text = _filter.Filter(this._text); return this._text; } } class MainProgram { static void Main() { MyObject obj = new MyObject(); LinkFilter lfilter = new LinkFilter(); PictureFilter pfilter = new PictureFilter(); Context con = new Context(lfilter,obj.Description); string desc = con.RunFilter(); con.UpdateFilter(pfilter); desc = con.RunFilter(); } } </code></pre>
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