Tutorials : The Anatomy Of A Groovy Builder :

Delegating Scope

b.screen {
    title( "My Page" )
    ...
}

b.screen {
    b.title( "My Page" )
    ...
}

The first class, NoDelegating, defines a screen method that takes a closure and then executes the closure and a title method. In the example tests below, the title method should never be called. The second class, SimpleDelegating, defines the same methods, but in the screen method it delegates the execution context of the closure to itself. The result is that any method calls made within the closure will be executed against the SimpleDelegating instance. The two tests below show the difference in behavior between the non-delegating and the delegating class:

@Test( expected = MissingMethodException )
public void noDelegationExample() {

    NoDelegating b = new NoDelegating();

    b.screen {
        title( "My Title" )
    }
}

@Test
public void simpleDelegatingExample() {

    SimpleDelegating b = new SimpleDelegating()

    b.screen {
        title( "My Title" )
    }

    assertEquals( true, b.titleCalled )
}

Groovy Named Arguments

navItem( name: "Home", focus: true, visible: true )
navItem( name: "Admin", focus: false, visible: false )
navItem( name: "Logout", focus: false, visible: true )

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