Groovy example source code file (CategoryAnnotationTest.groovy)

This example Groovy source code file (CategoryAnnotationTest.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

category, category, distance3367, distance3367, guy, guy, list, myguyver, mytest, pre-01234-post, string, string, test, type

The Groovy CategoryAnnotationTest.groovy source code

/*
 * Copyright 2003-2011 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.lang

class CategoryAnnotationTest extends GroovyTestCase {
    void testTransformationOfPropertyInvokedOnThis() {
        //Test the fix for GROOVY-3367
        assertScript """
            @Category(Distance3367)
            class DistanceCategory3367 {
                Distance3367 plus(Distance3367 increment) {
                    new Distance3367(number: this.number + increment.number)
                }
            }
    
            class Distance3367 {
                def number
            }
    
            use(DistanceCategory3367) {
                def d1 = new Distance3367(number: 5)
                def d2 = new Distance3367(number: 10)
                def d3 = d1 + d2
                assert d3.number == 15
            }
        """
    }

    void testTransformationWithCatchClause() {
        //Test the fix for GROOVY-4801
        assertScript """
            class ExceptionHandler {
                static def handled(Object self, Closure block) {
                    try { block.call() }
                    catch (Throwable t) { t.message }
                }
            }

            @Mixin(ExceptionHandler)
            class Caller {
                def thrower() { handled { 1/0 } }
            }

            assert new Caller().thrower() == 'Division by zero'
        """
    }

    void testCategoryMethodsHavingDeclarationStatements() {
        // GROOVY-3543: Declaration statements in category class' methods were not being visited by 
        // CategoryASTTransformation's expressionTransformer resulting in declaration variables not being 
        // defined on varStack resulting in compilation errors later
        assertScript """
            @Category(Test)
            class TestCategory {
                String getSuperName1() { 
                    String myname = "" 
                    return myname + "hi from category" 
                }
                // 2nd test case of JIRA
                String getSuperName2() { 
                    String myname = this.getName() 
                    for(int i = 0; i < 5; i++) myname += i 
                    return myname + "-Post"
                }
                // 3rd test case of JIRA
                String getSuperName3() { 
                    String myname = this.getName() 
                    for(i in 0..4) myname += i
                    return myname + "-Post"
                }
            }
    
            interface Test { 
                String getName() 
            }
    
            class MyTest implements Test {
                String getName() {
                    return "Pre-"
                }
            }
    
            def onetest = new MyTest()
            use(TestCategory) { 
                assert onetest.getSuperName1() == "hi from category"
                assert onetest.getSuperName2() == "Pre-01234-Post"
                assert onetest.getSuperName3() == "Pre-01234-Post"
            }
        """
    }

    void testPropertyNameExpandingToGetterInsideCategoryMethod() {
        //GROOVY-3543: Inside the category method, this.getType().name was failing but this.getType().getName() was not.
        assertScript """
            @Category(Guy)
            class Naming {
                String getTypeName() {
                    if(this.getType() != null)
                        this.getType().name
                    else
                        ""
                }
            }
            
            interface Guy {
                Type getType()
            }
            
            class Type {
                String name
            }
            
            class MyGuyver implements Guy {
                Type type
            }
            
            def atype = new Type(name: 'String')
            def onetest = new MyGuyver(type:atype)
            
            use(Naming) {
                assert onetest.getTypeName() == onetest.getType().getName()
            }
        """
    }

    void testClosureUsingThis() {
        assertScript """
            @Category(Guy)
            class Filtering {
                List process() {
                    this.messages.findAll{it.name != this.getName()}
                }
            }
            
            interface Guy {
                String getName()
                List getMessages()
            }
            
            class MyGuyver implements Guy {
                List messages
                String name
            }
            
            def onetest = new MyGuyver(
                    name: 'coucou',
                    messages : [['name':'coucou'], ['name':'test'], ['name':'salut']])
            
            Guy.mixin   Filtering
            
            assert onetest.process() == onetest.messages.findAll{it.name != onetest.getName()}        
        """
    }

    void testClosureWithinDeclarationExpressionAndMultipleAssignment() {
        // GROOVY-4546
        assertScript """
            @Category(Integer)
            class MyOps {
                def multiplesUpTo4() { [this * 2, this * 3, this * 4] }
                def multiplesUpTo(num) {
                    (2..num).collect{ j -> this * j }
                }
                def alsoMultiplesUpTo(num) {
                    def ans = (2..num).collect{ i -> this * i }
                    ans
                }
                def twice() {
                    def (twice, thrice, quad) = multiplesUpTo4()
                    twice
                }
            }

            use(MyOps) {
                assert 5.multiplesUpTo4() == [10, 15, 20]
                assert 5.multiplesUpTo(6) == [10, 15, 20, 25, 30]
                assert 5.alsoMultiplesUpTo(6) == [10, 15, 20, 25, 30]
                assert 5.twice() == 10
            }
        """
    }
}