groovy

Before I move on to the next iteration example, you should know about one other bit of syntactic sugar regarding Maps in Groovy.

It has always been a dream of mine to write Eclipse plug-ins in other languages like JavaScript, Groovy or Scala.

The next stop on this Groovy roadshow is to plug it into a build process, specifically my maven. xml file.

In the next article, I'll explore the dynamic nature of Groovy with you in greater detail.

It also seems to be picking up a lot of mind-share as the defacto 'Java Scripting Language', which is helping that community.

Drop one of these groovy guitars into your drink, and give it a stir. Will it make great music?

Since the inception of the Practically Groovy series almost a year ago, I've given you several opportunities to get to know closures.

In this article, the new and noteworthy features have been outlined, but we have barely scratched the surface of this new version of Groovy.

It's been almost a year since I introduced you to Groovy with the article " Feeling Groovy" in the alt. lang. jre series.

This release brings with it a raft of updates to the core Groovy language and libraries.

One of the joys of working with Groovy is all of the new methods that it adds to java. lang. String.

To do that, you will write a simple Groovy method that copies the field values in a JSON object into a chart URL.

But as the Groovy users regularly asked for this old construct to be also part of Groovy, the team decided to bring it back to Groovy.

Finally, you see one more bit of Groovy syntactic sugar you can use when calling getters on a class.

When it comes down to it I must be able to declare my domain classes in packages and the JetBrains plugin can't handle that.

Completely scrapping Ant or Maven and using Groovy for the entire build process would be a bit extreme in this case.

As you can see, unlike typical Java code, Groovy controls my iteration-specific code while allowing me to pass in the behavior I need.

The only project that has more downloads and a busier mailing list is Grails, a popular Web framework implemented in Groovy (see Resources).

In the next installment, I'll delve further into the functional features of a couple of dynamic languages on the JVM: Groovy and JRuby.

I hope I've made it clear that Groovy's Builders enable you to avoid the underlying markup of a particular language, like XML.

GORM helps mitigate the leaky-abstraction problem by allowing you to represent your object model in a way that makes sense in Groovy.

You may have noticed that the operator in Groovy is already overloaded in a few different areas, especially when it comes to collections.

Pixel Groovy is a user-controlled tutorial archive where members decide which tutorials to promote to the front page.

If you were a groovy chick, or are now a groovy hen, let's get together and listen to my boss collection of eight-track tapes.

A few simple examples will bring you up to speed on the Groovy String types I'll be working with in this article.

Groovy's handy-dandy shortcuts let me invoke the toJSON method on all objects within a collection with a *. invocation.

Before and after advice types are particularly easy to implement in Groovy.

This series, as its name implies, is all about practical uses for Groovy know-how.

Groovy allows you to add new methods to any class (including java. lang. Integer, which is how Groovy treats number literals).

In the next section, I'll put Groovy's template engine to the test with a more complicated example.

But as you get more comfortable with the newer syntax, your code will gradually evolve to embrace the more concise, expressive Groovy style.

Nestled among the branches, up off the ground, there's a nine-foot-diameter hardwood floor and groovy round mattress inside.

Well, let's just say you developed something cool in Groovy; wouldn't it be nice to be able to incorporate it into your Java programs, too?

Groovy's triple quotes (commonly called a HereDoc in other languages) make it effortless to store the XML internally, as shown in Listing 4.

Once your Java file is in place, you can create a "shadow" file next to it named AirportHbmConstraints. groovy, shown in Listing 10.

If, at some point later, I needed to make a change, I'd have to go into the Groovy script's logic to do it.

Graphic artist Antje Gerwien treads a fine line between groovy and grotesque, the the above bag designs illustrate so well.

I've shown in recent articles in the Practically Groovy series that Groovy is a superb tool for constructing reporting applications.

As the GDK cheekily says on its first page, "This document describes the methods added to the JDK to make it more groovy. "

Known as the Groovy Grove, Coconut Grove is a lush, tropical paradise on the edge of Biscayne Bay in sunny Southern Florida.

You might want to be a bit more fail-safe when doing database inserts and deletes in BootStrap. groovy.

"Mom and Dad, yeah, " he shouted. "Thank you Mom and Dad for turning me on to such a groovy profession. "

Groovy's collect method is rather slick, by the way: it allows me to drop in a corresponding loop that creates Race instances.

The last line of a Groovy method is an implicit return statement.

Even without knowing Groovy or easyb, you should be able to follow the code in Listing 10 and see that everything works as planned.

As a super-set of Java, it has a very straight-forward learning curve from Java.

The resource handlers should have the same name as the resource models but a . groovy rather than . json file extension.

Groovy templates aren't rocket science. They're simply a means for facilitating the separation of a view from its model.

This standard, but arguably least-common-denominator approach, allows you to embed a Groovy script effortlessly.

In classic Groovy, if you declared a parameter to your closure you had to use a | character for a separator.

However, the most noticeable changes will be in the general runtime performance improvements of Groovy.

You no longer need to write getters and setters for your fields, because Groovy provides them for you automatically.

Object in your normal Java classes lets you dynamically execute Groovy scripts just as the classloader does.

Groovy also allows you to eliminate some parentheses around parameters, leading to fewer noise characters.

The GroovyPdfGenerator. groovy script must contain at least one class that implements your interface.

It's time to see how to integrate Groovy code into a Spring-based application.

Groovy allows you to create lightweight wrapper classes around interfaces for just this situation.

Love enlighten computation is make water one of methods of sedimentary lens check, can regard make water as groovy auxiliary examination.

First, I'll show a traditional implementation of the Decorator pattern in Groovy, then make it more dynamic in subsequent examples.

This addition, as you've probably guessed, clears up ambiguities in classic Groovy.

One of the most underappreciated aspects of Groovy is the fact that it fully supports Java syntax.

The first step towards simplifying chart creation with Groovy is to define the data structure(s) used to specify chart details.

Leveraging the syntax of Groovy builders for creating user interfaces would probably be very nice.

Using Groovy beans in a Spring application is just as easy as using Java beans.

Notice that the action of the form is authenticate, which matches the name of the closure in UserController. groovy.

This mapping is the first important step for using templates in Groovy or, for that matter, any language that has a template engine.

One of the big advantages of Groovy is its ability to easily parse XML and JSON without having to invest a lot of time writing parsing code.

Because Java syntax is valid Groovy syntax as well, the initial learning curve is practically nonexistent.

The main goal of our groovy space game is to kill aliens and accumulate points, so we'll need a procedure to alter the score.

The last part of the method parses the XML result using a Groovy XmlSlurper and stores the results in a hashmap.

I honestly don't know whether the top-line productivity is as high as Python and Ruby, but I don't have any evidence that it is not.

As I mentioned earlier, you don't need to worry about creating the getters and setters: Groovy dynamically generates them for you.

This, by the way, is the heart of Groovy - and just imagine how it works when you re running scripts!

Groovy, a JVM dynamic language with a Java-like syntax, sports impressively powerful features that make mimicking AOP a breeze.

Recently, we've also seen the rise of tools like the Spock testing framework and CodeNarc (the static analysis tool for Groovy and Java).

Indeed, as I explained earlier, Groovy is a great enhancement to these tools, not a replacement.

With this control, Groovy neatly shifts the responsibility of resource handling from me to itself.

EMCs require the use of closures, which means that you can only implement them in Groovy.

A hippie is someone who was able to dig and get it on with the groovy ideas of the sixties.

Compress photograph comparing with groovy file, the compressibility of the watch depends on more elements.

Much has changed since the last Practically Groovy installment was published in late 2006.

Happily, Groovy seamlessly integrates with your existing codebase.

Groovy distributions always contained two different shells: a command-line shell as well as a Swing console.

In Larsson's drawings, the underground rooms have the groovy, biomorphic look of an old Yes album cover.

In the next article, I'll demonstrate an old technology that is garnering fresh, new interest thanks to Groovy's flexible syntax: Swing.

In this case, I've shown you how Groovy can be used to enhance rather than replace an already very powerful utility: Ant.

I discussed how several of the Gang of Four patterns can be implemented in more expressive languages (like Groovy).

This particular extension lets you run test suites via the groovy command, and also offers up a host of new assert methods.

Of course in the case of replacing a single letter, Groovy offers a more concise replace method.

The benefits of working with XML in Groovy become even more evident when you store the XML in a String variable instead of a file.

Groovy has one of the busiest mailing lists at Codehaus. org, where the project is hosted (see Resources).

If you are following along with the Groovy Eclipse plugin, you can a breakpoint at the start of the main method and step through the code.

You can use a very Groovy-like set of nested configuration blocks to store your values in the configuration file.

Now any request going to a . groovy URI will invoke the GroovyServlet, which will grab the requested resource and execute it as is.

Groovy runs best on Java 5 or 6. Type java -version at a command prompt to confirm that you are up-to-date.

Figure 5 shows an example of a script called hello. groovy with an event handler method for a GET event.

If Groovy isn't to your taste, we could re-implement the above examples in the dynamic language of your choice.

Groovy allows you to add direct support for numeric quantities via open classes.

This is another one of the many seemingly small features in Groovy that facilitates code readability through the reduction of noise.

Groovy's Metaobject-Protocol is a mechanism by which application developers can modify the implementation and behaviour of their language.

But I hope that I've demonstrated that we can get very far, with relatively little effort, thanks to the power of the Groovy language.

The fact that Groovy offers a concise Java-like syntax that also preserves Java semantics is pretty compelling.

Groovy improves the Java language's concept of iterators by making them implicit and more simple to use.

The key's value would be whatever I chose as my favorite scripting language (in this case, Groovy, of course).

This restriction is lifted in Groovy; you can change the values of variables in a containing scope from within an anonymous inner class.

Following convention over configuration, the controller should be named AirportHbmController. groovy.

I'm using Groovy's syntactic sugar to execute a code block, which is to place a set of parentheses adjacent to the code block's variable.

Gant is basically a Groovy way of invoking Ant tasks, which by itself gives you a lot compared to a good old build. xml.

Mastering Grails: Scott Davis's companion series focuses on this Groovy-based platform for Web development.

"Groovy name, groovy man, groovy politics! " del Toro said of his character.

When you are getting started with Groovy, much of your code will end up looking just like traditional Java code.

What makes Groovy particularly appealing with respect to other scripting platforms is its seamless integration with the Java platform.

BSF attempts to offer a common API for embedding any scripting language in a normal Java application, including Groovy.

His affable style and dedication to both Groovy and Grails has resonated with a broad swath of readers.

Each widget is comprised of a Groovy template (. gt file) and supporting JavaScript.

Creating a template with Groovy's template framework is quite similar to creating a JSP, since you can reuse the syntax found in JSPs.

Looking at the above GSP should seriously remind you of standard Groovy template development.

Groovy supports the notion of Builders, which are logical mechanisms for defining hierarchical data structures (see Resources).

In fact, I compiled my groovy unit tests into normal Java . class files and ran them as part of a Maven build.

Ever the expert expresses, if reasonable operation, the cost of network sale has the in part of groovy sale only.

While I could do something similar with Java code using anonymous inner classes, it's simply easier and less esoteric in Groovy.

In the previous installments of the Practically Groovy series, you discovered some pretty nifty features of Groovy.

In the flow's script activity instance, you provide the name of the Groovy script you will be calling along with other arguments (Figure 4).

But as you saw, Groovy is a great solution for Java developers who already know the Java language.

From the Gant installation section, enter a unique name and the location of the Groovy installation on the machine where Hudson is running.

Groovy functions require the def keyword, and you can think of them as globally static methods available within a script's scope.

Direct support for Groovy sources would be particularly helpful.

The setting includes these group strategy: Firewall, correspond immediately, groovy safety is installed, etc.

Classpaths are always important, so I've taken special care to create a proper classpath for Groovy to run.

You can customize the startup and shutdown process by adding your own code to the init and destroy closures in the BootStrap. groovy file.

Jakarta Commons Lang: These helper utilities for the java. lang API include classes you can use for metaprogramming with Groovy.

Scott talked about Failsafe database inserts and deletes in BootStrap. groovy to avoid duplicate records in the database.

script, shown in Listing 6. To get at the namespaced elements, you need to declare a couple of groovy. xml. Namespace variables.

You've now seen several different ways to configure Groovy language beans and how easy it is to use them in your Spring-based applications.

Although I'm only mentioning the plugin for IntelliJ IDEA, for your Groovy developments, you don't have to change your habits.

Everyone from experienced Java architects to non-Java programmers can easily grasp the intention of the code.

Groovy TagLibs and partial templates give you a more sophisticated way of sharing code and behavior across Web pages.

We will be able to access this set of name-value pairs in our Groovy code using Zero's global context.

In the column on Ant scripting with Groovy, I wrote a simple utility that generated a checksum report of class files.

If javac were a pluggable compiler, you could instruct it to compile both your Groovy and Java files at the same time.

The expression language used by the play template engine is Groovy, which provides a syntax consistent with Java.

This is why Groovy introduced the concept of a delegate.

Dynamic languages like Groovy make implementing custom-AOP infrastructure painless.

The new Groovy support can be used to write different OpenXava components like JPA entities, actions, and the test cases.

A groovy application for your mobile phone that will literally make your eyes spin.

Although a good IDE is almost a requirement for writing Java code these days, the same isn't necessarily true when it comes to Groovy.

The screenshot shows the debugger at a breakpoint inside the around security Closure in Runner. groovy.

So, what does the groovy processing measure after the patient art of lumbar protrusion of the intervertebral disc have?

You've heard people say for years that Groovy is a dynamic programming language for the JVM. But what does that really mean?

Recall that GORM is a thin Groovy facade over Hibernate, so it shouldn't surprise you that all of your old Hibernate tricks will still work.

In the last installment, I showed two different syntaxes in Groovy for open classes.

Grails supports Spring configuration through an alternate file: resources. groovy.

conf files; the parsing code from this method is copied from the previous tutorial and modified slightly to use a more Groovy-like syntax.

Groovy offers several features that make building DSLs easier. Support for quantities is a common requirement in DSLs.

Wouldn't you agree, baby you and me got a groovy kind of love?

Yes, that's two lines of Groovy and we have a namespace-aware XML parser and a map builder. It's almost too good to be true!

The resources directory in a WebSphere sMash application treats Groovy files in a unique way.

Groovy Eclipse comes with an embedded Groovy runtime library that is split off as its own Eclipse plugin (or in OSGi parlance, bundle).

Spring's support for Groovy lets you make such changes to a deployed application and have them take effect immediately.

I mentioned earlier that Groovy's SwingBuilder makes it possible to construct GUIs in an extremely simple manner.

Our web controller implements a "save" method, and we've mocked up a model Object using powerful Groovy features (Expando and Closures).

In Groovy, using the def keyword allows me to take advantage of duck-typing.

A Groovy configuration file is almost a domain-specific language (DSL) for storing your configuration settings.

Of course, the JSR-compliant parser has rendered some now "classic" syntax incompatible with the new Groovy.

Once you create the plug-in project, edit the ShiroWebXmlPlugin. groovy file, and add the code shown in Listing 7.

Once again, I am taking advantage of the seamless integration between the Java language and Groovy.

With Groovy and its support for duck-typing, there is no casting involved.

After groovy disinfection, use weak stimulation and medium and exciting technique commonly.

Template engines are like XSLT and can produce any format for which a template is defined, including XML, HTML, SQL, and Groovy code.

Notice the correlation between the virtual named resource and the Groovy handler's file name.

I categorize Groovy's overloadable operators into three logical groups: comparison operators, math-like operators, and array-like operators.

Ability to run Groovy classes, scripts and JUnit test cases written in Groovy.

By the way, if you're getting dizzy, don't be surprised: Using overload operators turns the Groovy language almost backwards.

I first wrote about the def keyword in the original Feeling Groovy article, a few months back.

In " Smooth Operators, " you learned that Groovy supports operator overloading.

The Command design pattern appears in Groovy as a code block, which is anything defined within free-standing curly braces ({ and }).

Although this Groovy shortcut syntax for Maps is undeniably cool, it is also the source of a common gotcha when you use reflection on Maps.

I'll conclude with a working example that shows you, first hand, how to integrate these groovy features with Eclipse and Maven.

Debugger: You can debug step by step across your Java and Groovy code, set breakpoints, show variables, the current stack, etc.

The Groovy script that you just wrote is almost like executable pseudocode.

Essentially, builders allow you to easily represent nested tree-like data structures, such as XML documents, in Groovy.

Just when you thought you'd learned it all, it turns out there are a few more ways to play with Groovy in the Java language.

In reality, Groovy calls the default no-argument constructor first and then calls the appropriate setter for each field.

Looking back at Config. groovy, you notice that logging output for the org. hibernate package is set to off.

By choosing to implement in Groovy, you can utilize an Eclipse plug-in to facilitate application creation and testing.

The next statement creates a groovy. xml. MarkupBuilder.

They also present a different way to handle behavior -- something Groovy (and its distant cousin Ruby) rely on heavily.

Obviously, Groovy's first class support for closures makes some tasks that are onerous in Java a breeze.

The Groovy language, version 1. 7, was recently released supporting refinements to the language itself as well as library enhancements.

Groovy project page: Download Groovy and learn more about closures and closure composition.

We also take advantage of Groovy's convenient parameter naming support to instantiate our AopDetails Object.

And even more groovy, you can see a swim-lane representation of all the actions in a use case organized by actor.

In all cases, these technologies are complementary, and in most cases, Groovy is the simpler alternative for on-the-fly development.

Groovy is a dynamic language that runs on the JVM and seamlessly integrates with the Java language.

Bear in mind that I'm dealing with the same java. io. File class in both Groovy and the Java language.

Groovy: In transmit the frequency in measuring to answer (extent and phasic ) by compensation.

Classic Groovy was quite flexible (and indeed terse) when it came to variable declarations.

First, let's write a Groovy class that can hold the details of a method call that has just been intercepted.

This tutorial guides you step-by-step through the fundamental concepts of Groovy.

This also illustrates a recurring theme in Groovy: Make common coding conventions simple.

This painting and static, flat paint an entirely different, more space with real icing on the cake, Groovy.

GPars - Groovy Parallel Systems: Get started with Groovy's actor-based framework for concurrent programming on the Java platform.

Because this kind of relationship doesn't exist in the Java language, Groovy had to introduce a new concept: delegates.

Groovy shares the same libraries, the same object model, the same threading model, and the same security model as Java.

The rules on Groovy variables have probably taken the hardest hit with the new JSR-compliant syntax.

Thanks to the conciseness of the Groovy language, many people choose to use a simple text editor instead.

Listing 7 shows the RESTdoc comments for the httpd. groovy file; the method implementations have been removed for brevity.

In other words, if you are a C# developer, learning VB. NET or Java will not help you as much as learning Ruby or Groovy.

I won't tackle Scala Groovy integration in this article, although there is a lot of potential synergy between the two languages.

Project Zero lets you create a Groovy file, a handler, to serve as the named resource.

The examples in the article are written in the Java language; however, I've redefined them below using Groovy.

Like all of Groovy, the syntax was designed for a short learning curve and a big payoff.

Beijing has rich offerings when it comes to art, music, groovy boutiques and quiet temples.

As nice as the JConsole GUI is, it's even nicer being able to make changes from a Groovy script.

My girlfriend got a new hairstyle today. She looks really groovy now.

That all changed when Groovy 1. 5 was released a year later.

The form will submit to a groovlet; accordingly, create a groovy folder inside the WEB-INF directory in your project.

Other implementers of Groovy IDEs are certainly struggling with similar problems, is there any collaboration going on?

Listing 1 is a Groovy script named backupAirports. groovy that backs up the records from the airport table.

Another cool feature we are considering to implement is cross language refactoring between Java and Groovy.

The latest improvements in this area added support for Groovy and Grails applications.

This time use Groovy's shorthand notation (the 'it' object) for the closure.

You saw classic Groovy parameter syntax for closures in Listing 21 of " Feeling Groovy, " where I demonstrated iteration.

In fact, decision-making independent character is a cover only, as normative company, the group is decision-making it is groovy .

Run-time substitution is actually a common feature among dynamic languages, and, as usual, Groovy takes things one step further.

Does that mean that you can execute Groovy source code directly?

It's also a near-perfect fit for reporting applications and, most importantly, unit testing.

Groovy mailing list: Browse, search, or subscribe to the Groovy mailing list.

Until then, I hope that you find plenty of practical uses for Groovy.

The Groovy interpreter compiles the source code in-memory before handing it off to the JVM.

The analysis of the abstract syntax tree of the Groovy code, allows us to collect all relevant information we need.

Either way, the point is that in JSR Groovy, I have to precede the variable with something.

To start, you need to define an interface to serve as the contract that your Groovy beans follow.

To run the unit test, type groovy PropertiesTest at the command line.

Gaelyk is a Groovy framework whose terse syntax and coding shortcuts I'll leverage to quickly build my GAE web application.

Netflix, which has a famously groovy culture, worked this out some time ago.

Looking closely at the Groovlet in Listing 5 should take you back to the time when you first started writing Groovy scripts.

No flash outfits, groovy eco-friendly yoga mats or super flexible bodies needed here.

Putting Groovy in charge of resource handling is extremely powerful.

Groovy supports two different syntaxes for open classes: categories and the ExpandoMetaClass.

If you reboot Grails, it reverts to the persistent settings in Config. groovy.

To show off your work, you will need to create two projects: one to hold your Groovy wrapper code and one to hold your sample Ajax UI.

In all seriousness, think of Groovy's println shortcut as an implicit method pointer to System. out. println.

In the next sections, I'll show you how to use Groovy's autocalling feature to enable some sophisticated features in your templates.

My colleague said that my new shoes were very groovy. It was a nice compliment.

First, add the groovy-all JAR (at the time of this writing, it is 1. 6. 4) into your project's classpath.

Then type groovy -version to make sure that Groovy is properly installed.

Of fracture following character nurse groovy ?

A powerful new tool that supports the utilization of Ant within Groovy scripts.

These functions can be referenced directly by name and can be defined in Groovy scripts, where they can seriously facilitate reuse.