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linq在java中的开源介绍
LINQ for Java Integrating Query, Sets and Transform operations in J2EE Olmo del Corral LINQ for Java The LINQ Project is a set of extensions to the .NET Framework for language-integrated query, set, and transform operations. Extends C# width native language syntax and class libraries for queries. We will show a way to do it in Java without making any change in the Java language. Query Example This is the way a C# 3 Query look like. It sorts, group and proyect the already defined collection: IEnumerablePerson people; Seems a SQL Query, but is just syntax sugar. So you can do the same without using it Without Query Expressions Without the cosmetics, it starts feeling standard Java code. In the 5th line, Name = is omitted. The compiler do it for you. But it makes confusing. It is worth? Without Anonymous Fields in Object Inicializators A step further in code normalization. But, what new {…} means?? It’s a Anonymous Type. Just like a Java Anonymous Class but only with Fields, Properties… The correct way of doing it’s by building your own class. Without Anonymous Types Now we have PersonResume class with a well-known syntax! Again, what kind of constructor have braces instead of () ? It’s a Object Inizializator, this expression calls the default constructor and then iterates setting every involver property. In Java we should create a specific constructor: Without Objects Inicializators PersonResume class has a constructor with every field. Much more Java-like! You said people is a IEnumerablePerson, so… Are Where, OrderBy, GroupBy methods of IEnumerableT? Not really. Those Are Extensional Methods, act as it those where in IEnumerableT, but in fact they are out. Confusing, right? Sun people prefer simplicity. A static method is a better approach. Without Extensional Methods Select, OrderBy, GroupBy… should be static methods in Java. Right! The only missing thing is the = operator. Some kind of p
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