Examples of groovy.lang.Closure

groovy.lang.Closure
Represents any closure object in Groovy.
Groovy allows instances of Closures to be called in a short form. For example:
```
 def a = 1 def c = {a} assert c() == 1 
```
To be able to use a Closure in this way with your own subclass, you need to provide a doCall method with any signature you want to. This ensures that {@link #getMaximumNumberOfParameters()} and {@link #getParameterTypes()} will work too without any additional code. If no doCall method is provided a closure must be used in its long form like
```
 def a = 1 def c = {a} assert c.call() == 1 
```
@author James Strachan @author John Wilson @author Jochen Theodorou @author Graeme Rocher @author Paul King @version $Revision: 22366 $

        assertThat(transformer.transform("original"), equalTo("original"));
    }


    @Test
    public void originalObjectIsSetAsDelegateForClosure() {
        Closure closure = HelperUtil.toClosure("{ substring(1, 3) }");


        transformer.add(closure);


        assertThat(transformer.transform("original"), equalTo("ri"));
    }

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        assertThat(transformer.transform("original"), equalTo("ri"));
    }
    
    @Test
    public void closureCanTransformAStringIntoAGString() {
        Closure closure = HelperUtil.toClosure("{ \"[$it]\" }");


        transformer.add(closure);


        assertThat(transformer.transform("original"), equalTo("[original]"));
    }

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        assertThat(fileCollection.getDependencySpec(), sameInstance(spec));
    }


    @Test
    public void filesWithClosureSpec() {
        Closure closure = HelperUtil.toClosure("{ dep -> dep.group == 'group1' }");
        final Set<File> fileSet = toSet(new File("somePath"));
        prepareForFilesBySpec(fileSet);
        assertThat(configuration.files(closure), equalTo(fileSet));
        assertThat(configuration.getState(), equalTo(Configuration.State.RESOLVED));
    }

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        assertThat(configuration.getState(), equalTo(Configuration.State.RESOLVED));
    }


    @Test
    public void fileCollectionWithClosureSpec() {
        Closure closure = HelperUtil.toClosure("{ dep -> dep.group == 'group1' }");
        DefaultConfiguration.ConfigurationFileCollection fileCollection = (DefaultConfiguration.ConfigurationFileCollection)
                configuration.fileCollection(closure);
        assertThat(fileCollection.getDependencySpec().isSatisfiedBy(HelperUtil.createDependency("group1", "name", "version")),
                equalTo(true));
        assertThat(fileCollection.getDependencySpec().isSatisfiedBy(HelperUtil.createDependency("group2", "name", "version")),

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    public void copyWithClosure() {
        prepareConfigurationForCopyTest();
        Set<Dependency> expectedDependenciesToCopy = new HashSet<Dependency>(configuration.getDependencies());
        configuration.addDependency(HelperUtil.createDependency("group3", "name3", "version3"));


        Closure specClosure = HelperUtil.toClosure("{ element ->  !element.group.equals(\"group3\")}");
        Configuration copiedConfiguration = configuration.copy(specClosure);


        assertThatCopiedConfigurationHasElementsAndName(copiedConfiguration, expectedDependenciesToCopy);
    }

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    public void copyRecursiveWithSpec() {
        prepareConfigurationForCopyRecursiveTest();
        Set<Dependency> expectedDependenciesToCopy = new HashSet<Dependency>(configuration.getAllDependencies());
        configuration.addDependency(HelperUtil.createDependency("group3", "name3", "version3"));


        Closure specClosure = HelperUtil.toClosure("{ element ->  !element.group.equals(\"group3\")}");
        Configuration copiedConfiguration = configuration.copyRecursive(specClosure);


        assertThatCopiedConfigurationHasElementsAndName(copiedConfiguration, expectedDependenciesToCopy);
    }

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    @Test
    public void eachObjectIsAvailableAsConfigureMethod() {
        Bean bean = new Bean();
        container.addObject("child", bean);


        Closure closure = toClosure("{ beanProperty = 'value' }");
        assertTrue(container.getAsDynamicObject().hasMethod("child", closure));
        container.getAsDynamicObject().invokeMethod("child", closure);
        assertThat(bean.getBeanProperty(), equalTo("value"));


        call("{ it.child { beanProperty = 'value 2' } }", container);

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    @Test
    public void addRuleByClosure() {
        String testPropertyKey = "org.gradle.test.addRuleByClosure";
        String expectedTaskName = "someTaskName";
        Closure ruleClosure = HelperUtil.toClosure(String.format("{ taskName -> System.setProperty('%s', '%s') }",
                testPropertyKey, expectedTaskName));
        container.addRule("description", ruleClosure);
        container.getRules().get(0).apply(expectedTaskName);
        assertThat(System.getProperty(testPropertyKey), equalTo(expectedTaskName));
        System.getProperties().remove(testPropertyKey);

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        Map event = (Map) handback;
        if (event != null) {
            Object del = event.get("managedObject");
            Object callback = event.get("callback");
            if (callback != null && callback instanceof Closure) {
                Closure closure = (Closure) callback;
                closure.setDelegate(del);
                if (closure.getMaximumNumberOfParameters() == 1)
                    closure.call(buildOperationNotificationPacket(notification));
                else closure.call();
            }
        }
    }

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            Map event = (Map) handback;
            if (event != null) {
                Object del = event.get("managedObject");
                Object callback = event.get("callback");
                if (callback != null && callback instanceof Closure) {
                    Closure closure = (Closure) callback;
                    closure.setDelegate(del);
                    if (closure.getMaximumNumberOfParameters() == 1)
                        closure.call(buildAttributeNotificationPacket(note));
                    else closure.call();
                }
            }
        }

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