src/test/groovy/AbstractClassAndInterfaceTest.groovy

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy

import gls.CompilableTestSupport

class AbstractClassAndInterfaceTest extends CompilableTestSupport {

    void testInterface() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                void methodOne(Object o)
                Object methodTwo()
            }
            
            class B implements A {
                void methodOne(Object o){assert true}
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
            }
            
            def b = new B();
            return b.methodTwo()
            """
        def retVal = shell.evaluate(text)
        assert retVal.class == Object
    }

    void testClassImplementingAnInterfaceButMissesMethod() {
        shouldNotCompile """
            interface A {
                void methodOne(Object o)
                Object methodTwo()
            }
            
            class B implements A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
        
        shouldNotCompile """
            interface A {
                Object methodTwo()
            }
            interface B extends A{
                void methodOne(Object o)
            }
            
            class C implements A {
                void methodOne(Object o){assert true}
            }
            
            def b = new C();
            return b.methodTwo()
            """
    }

    void testClassImplementingNestedInterfaceShouldContainMethodsFromSuperInterfaces() {
        shouldNotCompile """
            interface A { def a() }
            interface B extends A { def b() }
            class BImpl implements B {
                def b(){ println 'foo' }
            }
            new BImpl().b()
            """
    }

    void testAbstractClass() {
        def shell = new GroovyShell()
        def text = """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
            }
            
            class B extends A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
        def retVal = shell.evaluate(text)
        assert retVal.class == Object
    }    
    
    void testClassExtendingAnAbstractClassButMissesMethod() {
        shouldNotCompile """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
                abstract void MethodThree()
            }
            
            abstract class B extends A {
                void methodOne(Object o){assert true}
            }
            
            class C extends B{}
            
            def b = new C();
            return b.methodTwo()
            """    
        
       shouldNotCompile """
            abstract class A {
                abstract void methodOne(Object o)
                Object methodTwo(){
                    assert true
                    methodOne(null)
                    return new Object()
                }
                abstract void MethodThree()
            }
            
            class B extends A {
                void methodOne(Object o){assert true}
            }
            
            def b = new B();
            return b.methodTwo()
            """
    }
    
    void testInterfaceAbstractClassCombination() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                void methodOne()
            }
            
            abstract class B implements A{
                abstract void methodTwo()
            }
            
            class C extends B {
                void methodOne(){assert true}
                void methodTwo(){
                  methodOne()
                }
            }
            def c = new C()
            c.methodTwo()
            """
        shell.evaluate(text)
        
        shouldNotCompile """
            interface A {
                void methodOne()
            }
            
            abstract class B implements A{
                abstract void methodTwo()
            }
            
            class C extends B {}
            def c = new c()
            c.methodTwo()
            """
    }
    
    void testDefaultModifiersForInterfaces() {
        def shell = new GroovyShell()
        def text = """
            import java.lang.reflect.Modifier
            
            interface A {
                def foo
            }
            
            def fields = A.class.declaredFields
            assert fields.length==1
            assert fields[0].name == "foo"
            assert Modifier.isPublic (fields[0].modifiers)
            assert Modifier.isStatic (fields[0].modifiers)
            assert Modifier.isFinal  (fields[0].modifiers)
            """
        shell.evaluate(text)
    }
    
    void testAccessToInterfaceField() {
        def shell = new GroovyShell()
        def text = """
            interface A {
                def foo=1
            }
            class B implements A {
              def foo(){foo}
            }
            assert new B().foo()==1
       """
       shell.evaluate(text)
    }

    void testImplementsDuplicateInterface() {
        shouldCompile """
        interface I {}
        class C implements I {}
        """
        shouldNotCompile """
        interface I {}
        class C implements I, I {}
        """
    }

    void testDefaultMethodParamsNotAllowedInInterface() {
        shouldCompile """
        interface Foo {
           def doit( String param, int o )
        }
        """
        shouldNotCompile """
        interface Foo {
           def doit( String param = "Groovy", int o )
        }
        """
    }
    
    void testClassImplementsItselfCreatingACycle() {
        def scriptStr = """
            package p1
            class XXX implements XXX {}
        """
        shouldNotCompile scriptStr
        
        scriptStr = """
            class YYY implements YYY {}
        """
        shouldNotCompile scriptStr
    }
}