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Groovy example source code file (EnumTest.groovy)

This example Groovy source code file (EnumTest.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

a, a, all_colors, b, b, foo3284, foo32842, foo4444, red, string, string, x, x, y

The Groovy EnumTest.groovy source code

/*
 * Copyright 2003-2009 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 gls.enums

import gls.CompilableTestSupport

/**
 * Tests various properties of enums.
 *
 * @author Paul King
 * @author Roshan Dawrani
 */
class EnumTest extends CompilableTestSupport {

    void testValues() {
        assert UsCoin.values().size() == 4
        assert UsCoin.values().toList().sum{ it.value } == 41
    }

    void testNext() {
        def coin = UsCoin.penny
        def coins = [coin++, coin++, coin++, coin++, coin]
        assert coins == [UsCoin.penny, UsCoin.nickel, UsCoin.dime, UsCoin.quarter, UsCoin.penny]
    }

    void testPrevious() {
        def coin = UsCoin.quarter
        def coins = [coin--, coin--, coin--, coin--, coin]
        assert coins == [UsCoin.quarter, UsCoin.dime, UsCoin.nickel, UsCoin.penny, UsCoin.quarter]
    }

    void testRange() {
        def coinRange1 = UsCoin.penny..UsCoin.dime
        assert (UsCoin.nickel in coinRange1)
        assert !(UsCoin.quarter in coinRange1)
    }

    void testMinValue() {
        assert UsCoin.MIN_VALUE == UsCoin.penny
        shouldFail(MissingPropertyException) {
           EmptyEnum.MIN_VALUE
        }
    }

    void testMaxValue() {
        assert UsCoin.MAX_VALUE == UsCoin.quarter
        shouldFail(MissingPropertyException) {
           EmptyEnum.MAX_VALUE
        }
    }

    void testComparators() {
        assert UsCoin.nickel <=> UsCoin.penny  ==  1
        assert UsCoin.nickel <=> UsCoin.nickel ==  0
        assert UsCoin.nickel <=> UsCoin.dime   == -1
        assert UsCoin.nickel <=  UsCoin.nickel
        assert UsCoin.nickel <=  UsCoin.dime
        assert UsCoin.nickel >=  UsCoin.penny
        assert UsCoin.nickel >=  UsCoin.nickel
    }

    void testStepWithRange() {
        def coinRange2 = UsCoin.nickel..UsCoin.quarter
        def coins = coinRange2.toList()
        assert coins == [UsCoin.nickel, UsCoin.dime, UsCoin.quarter]
        coins = coinRange2.step(2)
        assert coins == [UsCoin.nickel, UsCoin.quarter]
        coins = coinRange2.step(3)
        assert coins == [UsCoin.nickel]
        coins = coinRange2.step(4)
        assert coins == [UsCoin.nickel]
        coins = coinRange2.step(-1)
        assert coins == [UsCoin.quarter, UsCoin.dime, UsCoin.nickel]
        coins = coinRange2.step(-2)
        assert coins == [UsCoin.quarter, UsCoin.nickel]
        coins = coinRange2.step(-3)
        assert coins == [UsCoin.quarter]
        coins = coinRange2.step(-4)
        assert coins == [UsCoin.quarter]
    }

    void testStepWithReverseRange() {
        def coinRange2 = UsCoin.quarter..UsCoin.nickel
        def coins = coinRange2.toList()
        assert coins == [UsCoin.quarter, UsCoin.dime, UsCoin.nickel]
        coins = coinRange2.step(2)
        assert coins == [UsCoin.quarter, UsCoin.nickel]
        coins = coinRange2.step(3)
        assert coins == [UsCoin.quarter]
        coins = coinRange2.step(4)
        assert coins == [UsCoin.quarter]
        coins = coinRange2.step(-1)
        assert coins == [UsCoin.nickel, UsCoin.dime, UsCoin.quarter]
        coins = coinRange2.step(-2)
        assert coins == [UsCoin.nickel, UsCoin.quarter]
        coins = coinRange2.step(-3)
        assert coins == [UsCoin.nickel]
        coins = coinRange2.step(-4)
        assert coins == [UsCoin.nickel]
    }

    void testEnumWithSingleListInConstructor() {
        def sh = new GroovyShell();
        def enumStr;
        
        enumStr = """
            enum ListEnum1 {
                ONE([111, 222])
                ListEnum1(Object listArg){
                    assert listArg == [111, 222]
                    assert listArg instanceof java.util.ArrayList
                }
            }
            println ListEnum1.ONE
        """
        sh.evaluate(enumStr);
            
        enumStr = """
            enum ListEnum2 {
                TWO([234, [567,12]])
                ListEnum2(Object listArg){
                    assert listArg == [234, [567, 12]]
                    assert listArg instanceof java.util.ArrayList
                }
            }
            println ListEnum2.TWO
        """
        sh.evaluate(enumStr);
    }
    
    void testSingleListDoesNoInfluenceMaps() {
        // the fix for GROOVY-2933 caused map["taku"]
        // to become map[(["take])] instead. -> GROOVY-3214
        assertScript """
            public enum FontFamily {
                ARIAL
            
                static public void obtainMyMap()
                {
                    Map map = [:]
                    map["taku"] = "dio"
                    assert map.taku == "dio"
                }
            }
            FontFamily.obtainMyMap()
        """
    }
 
    void testMutipleValuesDontGetWronglyWrappedInList() {
        // the fix for GROOVY-3214 caused multiple values passed in an enum const
        // to get wrapped in an extra ListExpression. -> GROOVY-3276
        assertScript """
            enum GROOVY3276 {
               A(1,2), B(3,4)
           
               GROOVY3276(int xx, int yy) { 
                   x=xx 
                   y=yy 
               }
               public int x
               public int y
           }
           
           assert GROOVY3276.A.x == 1
           assert GROOVY3276.B.y == 4
        """
    }

    // the fix for GROOVY-3161
    def void testStaticEnumFieldWithEnumValues() {
        def allColors = GroovyColors3161.ALL_COLORS
        assert allColors.size == 3
        assert allColors[0] == GroovyColors3161.red
        assert allColors[1] == GroovyColors3161.blue
        assert allColors[2] == GroovyColors3161.green
    }

    // the fix for GROOVY-3283
    def void testImportStaticMoreThanOneEnum() {
        assertScript """
            enum Foo3283 { A,B }
            enum Bar3283 { X,Y }
            
            import static Foo3283.*
            import static Bar3283.*
            
            a = A
            x = X
        """
    }

    void testCallBehaviorOnEnumForGROOVY3284() {
        // test the usage in a non-script class first
        for (f in Foo3284) {
            assert f() == "A"
        }
        assert Foo3284.A.call() == "A"
        assert Foo3284.A() == "A"
        def a = Foo3284.A
        assert a() == "A"

        // now test the usage in a script but this time type Closure not specified explicitly
        assertScript """
            enum Foo32842 {
                B({ "B" })
                Foo32842(c) {
                  call = c
                }
                def call
            }
            for (f in Foo32842) {
                assert f() == "B"
            }
    
            assert Foo32842.B.call() == "B"
    
            assert Foo32842.B() == "B"
            b = Foo32842.B
            assert b() == "B"
        """
    }

    void testClassResolutionForInnerEnumsWithPackageNameGROOVY3483() {

        assertScript """
            package familie
            
            class Mother3483 {
                Mother3483.Child child
                
                enum Child{
                    Franz,
                    Ferdi,
                    Nand
                }
            }
            
            def mother = new Mother3483(child: Mother3483.Child.Franz)
            
            assert mother.child as String == 'Franz'
        """
    }

    void testInnerEnumUsedInDefiningClassWithUnqualifiedEnumNameUsed() {
        //GROOVY-3110
        assertScript """
            class Class3110 {
                enum Enum3110{FOO, BAR}
                Enum3110 var
                def setEnumVar() {
                    var = Enum3110.FOO
                }
                def getEnumVar() {
                    var
                }
            }
            
            def obj = new Class3110()
            obj.setEnumVar()
            assert obj.getEnumVar() == Class3110.Enum3110.FOO
        """
    }

    void testStaticFieldInitValuesInAStaticBlock() {
        // GROOVY-3693 - trigger enum class load to test it - asserts are present in the enum 
        GrooyColors3693.r
    }
    
    void testCustomMethodOnEnum() {
        // GROOVY-2443
        assertScript """
            enum Day {
                SUNDAY {
                    String activity() { 'Relax' }
                }, MONDAY, TUESDAY, WEDNESDAY,
                THURSDAY, FRIDAY, SATURDAY
                String activity() { 'Work' }
            }
            assert "Work" == Day.MONDAY.activity() 
            assert "Relax" == Day.SUNDAY.activity()
        """
    }

    void testEnumConstantSubClassINITMethodOverrideINITOfEnumClass() {
        try {
            // cause loading of enum that causes its fields to be set and 
            // their instance initializer to be executed
            println Color3985
        }catch(ExceptionInInitializerError err) {
            assert err.cause.message == 'Color3985 RED instance initializer called successfully'
        }
    }

    void testEnumStaticInitWithAFieldUsingEnumValues() {
        //GROOVY-3996
        assertScript """
            enum Color3996 {
                R, G, B
                public static Color3996[] ALL_COLORS = [R, G, B]
            }
            
            assert Color3996.ALL_COLORS.size() == 3
            assert Color3996.ALL_COLORS[0] == Color3996.R
            assert Color3996.ALL_COLORS[1] == Color3996.G
            assert Color3996.ALL_COLORS[2] == Color3996.B
        """
    }

    void testEnumWithTopLevelNoBracketsMethodCall() {
        // GROOVY-3986
        assertScript """
            enum Color3986 {
                RED {
                  String toString() { sprintf '%s', 'foo' }
                },GREEN,BLUE
            }
            assert Color3986.RED.toString() == 'foo'
        """
    }

    void testEnumConstantSeparators() {
        // GROOVY-3047
        shouldCompile """
            enum Foo0 { X }
            enum Foo1 {

              Y

            }
            enum Foo2 {
              Z,
            }
            enum Foo3 { X, Y, Z,
            }
            enum Foo4 {
              X
              ,
            }
            enum Foo5 {
              X
              ,
              Y
            }
            enum Foo6 {
              X
              ,
              Y,
            }
            enum Foo7 {
              X
              ,
              Y
              ,
            }
        """
    }

    void testEnumWithSingleValueAndClassField() {
        // GROOVY-4268
        shouldCompile """
            private enum EnumWithSingleValueAndClassField {
                VALUE
                String toString() { "I'm a value" }
            }
        """
    }

    void testConstructorChainingInEnum() {
        // GROOVY-4444
        assertScript """
            enum Foo4444 {
                ONE(1), TWO(1, 2)
              
                int i
                int j
              
                Foo4444(int i) {
                    this(i, 0)
                }
            
                Foo4444(int i, int j) {
                    this.i = i
                    this.j = j
                }
            }
            
            def foos = [Foo4444.ONE, Foo4444.TWO]
            
            assert foos.size() == 2
            
            assert foos[0].i == 1
            assert foos[0].j == 0
            
            assert foos[1].i == 1
            assert foos[1].j == 2
        """
    }
    
    void testNamedArguments() {
        // this test is a result of GROOVY-4219 and should be changed once
        // GROOVY-4582 is implemented.
        shouldNotCompile """
            enum ImageSortField {
                FILENAME(field: null, name: null),
                TIME(field: null, name: null)
                
                def field
                def name
            
                public String toString(){
                    name
                }
            }
        """
    }
}


enum UsCoin {
    penny(1), nickel(5), dime(10), quarter(25)
    UsCoin(int value) { this.value = value }
    private final int value
    int getValue() { value }
}

enum EmptyEnum{}

enum GroovyColors3161 {
    red, blue, green
    static def ALL_COLORS = [red, blue, green]
}

enum GroovyColors3161B {
    red, blue, green,
    static def ALL_COLORS = [red, blue, green]
}

enum Foo3284 {
    A({ "A" })
    Foo3284(Closure c) {
      call = c
    }
    final Closure call
}

enum GrooyColors3693 {
    r, g, b
    static List list = [1, 2]
    static init() {
        assert list == [1, 2]
    }
    static { 
        init() 
    }
}

enum Color3985 {
    RED {
        { 
            throw new RuntimeException('Color3985 RED instance initializer called successfully') 
        }
    },GREEN,BLUE
}

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