How can I dynamically override a class's "each" method in Groovy?

Posted by rewbs on Stack Overflow See other posts from Stack Overflow or by rewbs
Published on 2010-05-02T16:06:58Z Indexed on 2010/05/03 10:08 UTC
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Groovy adds each() and a number of other methods to java.lang.Object. I can't figure out how to use the Groovy metaclass to dynamically replace the default each() on a Java class.

I can see how to add new methods:

MyJavaClass.metaClass.myNewMethod = { closure -> /* custom logic */ }
new MyJavaClass().myNewMethod { item -> println item }  // runs custom logic

But it seems the same approach doesn't work when overriding methods:

MyJavaClass.metaClass.each = { closure -> /* custom logic */ }
new MyJavaClass().each { item -> println item }  // runs Object.each()

What am I doing wrong? How can I dynamically override each() in Groovy?

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