Groovy example source code file (Groovy4069Bug.groovy)

This example Groovy source code file (Groovy4069Bug.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

childx, childx, childy, childy, expandometaclass, groovy4069bug, groovyshell, groovytestcase, map, parentx, parentx, parenty, parenty

The Groovy Groovy4069Bug.groovy source code

package groovy.bugs

class Groovy4069Bug extends GroovyTestCase {

    void testEMCConstructorWithSubClassingTest1V1() {
        def shell = new GroovyShell()
        shell.evaluate """
            ExpandoMetaClass.enableGlobally()
            try {            
                // ChildX.metaClass
                def oldMetaClass = ParentX.metaClass
                
                def emc = new ExpandoMetaClass(ParentX, true, true)
                emc.initialize()
                GroovySystem.metaClassRegistry.setMetaClass(ParentX, emc)
                
                emc.constructor = { Map m -> ParentX.newInstance() }
                
                assert new ChildX([:]).class.name == 'ChildX'
                
                GroovySystem.metaClassRegistry.removeMetaClass(ParentX) 
                GroovySystem.metaClassRegistry.setMetaClass(ParentX, oldMetaClass)
                
                assert new ChildX([:]).class.name == 'ChildX'
            } finally {
                ExpandoMetaClass.disableGlobally()
            }
            class ParentX { def a }
            class ChildX extends ParentX { def b }
        """
    }
    
    void testEMCConstructorWithSubClassingTest1V2() {
        def shell = new GroovyShell()
        shell.evaluate """
            ExpandoMetaClass.enableGlobally()
            try {
                ChildX.metaClass
                def oldMetaClass = ParentX.metaClass
                
                def emc = new ExpandoMetaClass(ParentX, true, true)
                emc.initialize()
                GroovySystem.metaClassRegistry.setMetaClass(ParentX, emc)
                
                emc.constructor = { Map m -> ParentX.newInstance() }
                
                assert new ChildX([:]).class.name == 'ChildX'
                
                GroovySystem.metaClassRegistry.removeMetaClass(ParentX) 
                GroovySystem.metaClassRegistry.setMetaClass(ParentX, oldMetaClass)
                
                assert new ChildX([:]).class.name == 'ChildX'
            } finally {
                ExpandoMetaClass.disableGlobally()
            }
            class ParentX { def a }
            class ChildX extends ParentX { def b }
        """
    }
    
    void testEMCConstructorWithSubClassingTest2V1() {
        def shell = new GroovyShell()
        shell.evaluate """
            ExpandoMetaClass.enableGlobally()
            try {            
                // ChildY.metaClass
                def oldMetaClass = ChildY.metaClass
                
                def emc = new ExpandoMetaClass(ChildY, true, true)
                emc.initialize()
                GroovySystem.metaClassRegistry.setMetaClass(ChildY, emc)
                
                emc.constructor = { Map m -> ParentY.newInstance() }
                
                assert new ChildY([:]).class.name == 'ParentY'
                
                GroovySystem.metaClassRegistry.removeMetaClass(ChildY) 
                GroovySystem.metaClassRegistry.setMetaClass(ChildY, oldMetaClass)
                
                assert new ChildY([:]).class.name == 'ChildY'
            } finally {
                ExpandoMetaClass.disableGlobally()
            }
            class ParentY { def a }
            class ChildY extends ParentY { def b }
        """
    }

    void testEMCConstructorWithSubClassingTest2V2() {
        def shell = new GroovyShell()
        shell.evaluate """
            ExpandoMetaClass.enableGlobally()
            try {            
                ChildY.metaClass
                def oldMetaClass = ChildY.metaClass
                
                def emc = new ExpandoMetaClass(ChildY, true, true)
                emc.initialize()
                GroovySystem.metaClassRegistry.setMetaClass(ChildY, emc)
                
                emc.constructor = { Map m -> ParentY.newInstance() }
                
                assert new ChildY([:]).class.name == 'ParentY'
                
                GroovySystem.metaClassRegistry.removeMetaClass(ChildY) 
                GroovySystem.metaClassRegistry.setMetaClass(ChildY, oldMetaClass)
                
                assert new ChildY([:]).class.name == 'ChildY'
            } finally {
                ExpandoMetaClass.disableGlobally()
            }
            class ParentY { def a }
            class ChildY extends ParentY { def b }
        """
    }
}