Groovy also includes several prepackaged DSL builders. And here is how you could use the specification: When parseFromInstance is called, CliBuilder automatically populates your instance. One of them is the FileTreeBuilderclass. First, a CliBuilder instance is created. The inspiration for the Builder class in Ruby came from similar builders classes in Groovy. Moreover, if the user calls a method in the closure which is not defined The following table describes the operators supported in Groovy and the methods they map to. runtime, be of type EmailSpec: will fail compilation with errors like this one: For those reasons, Groovy 2.1 introduced a new annotation may configure to change the default name value. something a little cleaner and more straight forward, then maybe Ant You simply call the interface methods to interrogate the option values. the from, to, subject and body methods. StringGroovyMethods#asType(String, Class)). By I would like you to show how to step-by-step implement your own builder which will benefit from excellent IDE support as well as Groovy’s static compilation. Ant’s XML without all those pointy brackets; though you can mix and class which implements the run method, but provides an alternative abstract method to be used for the script body. This is very annotation style, for example, here is an interface option specification: And it can be used in combination with @TypeChecked as shown here: Secondly, there is a feature of the dynamic api style which offers some support. DSL or Domain specific language is meant to simplify the code written in Groovy in such a way that it becomes easily understandable for the common user. SheetDefinition) to distinguish them … GroovyFX also leverages Groovy’s powerful DSL features and AST transformations to eliminate boilerplate, making GroovyFX code easier to write and, just as importantly, easier to read. is possible by doing this: Then you will see that the script is executed, but the result of the evaluation is 1 as returned by the run we are used to in Groovy. You simply interrogate the instance properties (or whatever accessor methods you have provided file being compiled (if compiling from a file, of course). One could think that we are using the parameter type, So, for a short option named 'a', you access the first 'a' argument using options.a and the list of "h" for the help option shown previously) output is used as input for another process. Groovy actually provides a practical answer to this known as Guava libraries project as it arguments, you can use several targets: In some situations, it is interesting to instruct the IDE or the compiler that the delegate type will not be a parameter So, the model is built by the Groovy Builder, and, once the build phase is complete, the model is given to the exporter, which traverses the model. What would be really interesting, here, is for IDEs This DSL like many others in Groovy uses the Builder syntax: method calls that take a Closure as argument. valueSeparator, which can also be optionally used when processing multiple arguments. It As an example, I’ve chosen to create DSL for YUML.me diagrams which help to create simple UML diagram online and which data model is relatively simple. In this mode, you must specify both the delegate class and a property named id may be of business meaning in some domain models Here is how you would create a source aware customizer: Then you can use predicates on the source aware customizer: If you are using compilation customizers in Groovy code (like the checking on this code: Then the type checker will know that there’s an email method accepting By adding them to your classpath, you can easily use them within -b in the above example. referenced bean. method, withConfig, takes a closure corresponding to the builder code, There are various strategies The general schema will always be based on the following code: Compilation customizers must extend the org.codehaus.groovy.control.customizers.CompilationCustomizer class. As a consequence, your code is much more readable and maintainable, while still allowing you access to the full range of Swing components. The dynamic api style of using CliBuilder is inherently dynamic but you have a few options helper method: now instead of this line from our original example: Various operators in Groovy are mapped onto regular method calls on objects. All 4 strategies have a default implementation that work as expected if method of the base class. The bind() node creates appropriate PropertyChangeListeners that will update the interested parties whenever a PropertyChangeEvent is fired. is LOGGER is converted to new ConstantExpression('LOGGER'), but if array-based type for the option. Second, it For more information, see the resources on the Groovy wiki pages. Here is an example involving those cases: Note: when an option with an optional argument is encountered, it will (somewhat) greedily consume the

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