Package groovy.util

Class DelegatingScript

  • All Implemented Interfaces:
    GroovyObject
    public abstract class DelegatingScript
extends Script
    Script that performs method invocations and property access like Closure does.

    DelegatingScript is a convenient basis for loading a custom-defined DSL as a Script, then execute it. The following sample code illustrates how to do it: 

     class MyDSL {
     public void foo(int x, int y, Closure z) { ... }
     public void setBar(String a) { ... }
 }

 CompilerConfiguration cc = new CompilerConfiguration();
 cc.setScriptBaseClass(DelegatingScript.class.getName());
 GroovyShell sh = new GroovyShell(cl,new Binding(),cc);
 DelegatingScript script = (DelegatingScript)sh.parse(new File("my.dsl"))
 script.setDelegate(new MyDSL());
 script.run();

    my.dsl can look like this: 

     foo(1,2) {
     ....
 }
 bar = ...;

    DelegatingScript does this by delegating property access and method invocation to the delegate object.

    More formally speaking, given the following script: 

     a = 1;
 b(2);

    Using DelegatingScript as the base class, the code will run as: 

     delegate.a = 1;
 delegate.b(2);
    ... whereas in plain Script, this will be run as: 
     binding.setProperty("a",1);
 ((Closure)binding.getProperty("b")).call(2);

    • Constructor Detail

      • DelegatingScript

        protected DelegatingScript()

      • DelegatingScript

        protected DelegatingScript​(Binding binding)

    • Method Detail

      • setDelegate

        public void setDelegate​(java.lang.Object delegate)
        Sets the delegation target.

      • invokeMethod

        public java.lang.Object invokeMethod​(java.lang.String name,
                                     java.lang.Object args)
        Description copied from class: Script
        Invoke a method (or closure in the binding) defined.
        Specified by:
        invokeMethod in interface GroovyObject
        Overrides:
        invokeMethod in class Script
        Parameters:
        name - method to call
        args - arguments to pass to the method
        Returns:
        value

      • getProperty

        public java.lang.Object getProperty​(java.lang.String property)
        Description copied from interface: GroovyObject
        Retrieves a property value.
        Specified by:
        getProperty in interface GroovyObject
        Overrides:
        getProperty in class Script
        Parameters:
        property - the name of the property of interest
        Returns:
        the given property

      • setProperty

        public void setProperty​(java.lang.String property,
                        java.lang.Object newValue)
        Description copied from interface: GroovyObject
        Sets the given property to the new value.
        Specified by:
        setProperty in interface GroovyObject
        Overrides:
        setProperty in class Script
        Parameters:
        property - the name of the property of interest
        newValue - the new value for the property

      • getDelegate

        public java.lang.Object getDelegate()