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How to implement a rule engine?

...ppet compiles the Rules into fast executable code (using Expression trees) and does not need any complicated switch statements: (Edit : full working example with generic method) public Func<User, bool> CompileRule(Rule r) { var paramUser = Expression.Parameter(typeof(User)); Expression...
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How to read the value of a private field from a different class in Java?

I have a poorly designed class in a 3rd-party JAR and I need to access one of its private fields. For example, why should I need to choose private field is it necessary? ...
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How do disable paging by swiping with finger in ViewPager but still be able to swipe programmaticall

I have ViewPager and below it I have 10 buttons. By clicking on button, for example #4, the pager goes immediately to page #4 by mPager.setCurrentItem(3); . But, I want to disable the paging by swiping with finger horizontally. Thus, the paging is done ONLY by clicking on the buttons. So, how I ...
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Create a new database with MySQL Workbench

...rowser", which shows the list of databases. (Side note: The terms "schema" and "database" are synonymous in this program.) Right-click on one of the existing databases and click "Create Schema...". This will launch a wizard that will help you create a database. If you'd prefer to do it in SQL, en...
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Error: This Android SDK requires Android Developer Toolkit version 22.6.1 or above

...dt 20.x.x Select the list items Let it be installed. Eclipse will restart and Its done. I hope this will helpful for you :) share | improve this answer | follow ...
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How do I recursively delete a directory and its entire contents (files + sub dirs) in PHP?

How do I delete a directory and its entire contents (files and subdirectories) in PHP? 21 Answers ...
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Detect If Browser Tab Has Focus

... Yes, window.onfocus and window.onblur should work for your scenario: http://www.thefutureoftheweb.com/blog/detect-browser-window-focus share | ...
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How to keep a git branch in sync with master

...git checkout master git merge mobiledevicesupport git push origin master and thats it. the assumption here is that mobilexxx is a topic branch with work that isn't ready to go into your main branch yet. So only merge into master when mobiledevicesupport is in a good place ...
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How can I make a weak protocol reference in 'pure' Swift (without @objc)

...ere). This seems to be bug. The only solution I have found is to use @objc and eliminate all Swift data types from the protocol. – Jim T Jul 3 '14 at 22:32 12 ...
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Try catch statements in C

... in C. However, is there a way to "simulate" them? Sure, there is assert and other tricks but nothing like try/catch, that also catch the raised exception. Thank you ...