The Groovy Swing Console allows a user to enter and run Groovy scripts. This page documents the features of this user interface.
The Groovy Console:
Handy tips for running scripts:
You can open any text file, edit it, run it (as a Groovy Script) and then save it again when you are finished.
__' (two underscores). The result of the last run is
_[-1], the result of the second to last run is
[-2]and so forth.
To embed a Swing console in your application, simply create the Console object,
load some variables, and then launch it. The console can be embedded in either Java or Groovy code.
The Java code for this is:
Once the console is launched, you can use the variable values in Groovy code.
An example of how to embed either the GroovyConsole or GroovyShell in a Spring Web application can be found at Embedding a Groovy Console in a Java Server Application
You can customize the way script output results are visualized. Let's see how we can customize this. For example, viewing a map result would show something like this:
What you see here is the usual textual representation of a Map. But, what if we enabled custom visualization of certain results? The Swing console allows you to do just that. First of all, you have to ensure that the visualization option is ticked: View -> Visualize Script Results — for the record, all settings of the Groovy Console are stored and remembered thanks to the Preference API. There are a few result visualizations built-in: if the script returns a java.awt.Image, a javax.swing.Icon, or a java.awt.Component with no parent, the object is displayed instead of its toString() representation. Otherwise, everything else is still just represented as text. Now, create the following Groovy script in ~/.groovy/OutputTransforms.groovy:
The Groovy Swing console will execute that script on startup, injecting a transforms list in the binding of the script, so that you can add your own script results representations. In our case, we transform the Map into a nice-looking Swing JTable. And we're now able to visualize maps in a friendly and attractive fashion, as the screenshot below shows:
Groovy Console can visualize the AST (Abstract Syntax Tree) representing the currently edited script, as shown by the screenshot below. This is particularly handy when you want to develop AST transformations.