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Commit c9485ac

Browse files
test enums with interface
1 parent bfeda0b commit c9485ac

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5 files changed

+202
-1
lines changed

5 files changed

+202
-1
lines changed
Lines changed: 48 additions & 0 deletions
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package enums;
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import java.util.ArrayList;
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import java.util.EnumSet;
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import java.util.List;
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/**
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*
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*/
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public enum CleanUpStage implements Stage<CleanUpStage> {
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SETUP_PARAMETERS, STOP_PROCESS, REMOVE_FILES;
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private static List<CleanUpStage> STAGES = new ArrayList<>(EnumSet.allOf(CleanUpStage.class));
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@Override
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public CleanUpStage getFirstStage() {
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return STAGES.get(0);
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}
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@Override
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public CleanUpStage getLastStage() {
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return STAGES.get(STAGES.size() - 1);
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}
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@Override
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public List<CleanUpStage> getSortedStage() {
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return new ArrayList<>(STAGES);
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}
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@Override
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public CleanUpStage upgradeTo() {
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if (getLastStage() == this) {
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return this;
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}
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return getStage(STAGES, 1);
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}
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@Override
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public CleanUpStage downgrade() {
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if (getFirstStage() == this) {
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return this;
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}
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return getStage(STAGES, -1);
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}
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}
Lines changed: 52 additions & 0 deletions
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package enums;
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import java.util.ArrayList;
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import java.util.EnumSet;
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import java.util.List;
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/**
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*
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*/
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public enum InstallStage implements Stage<InstallStage> {
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SETUP, INSTALL, JOIN;
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private static List<InstallStage> STAGES = new ArrayList<>(EnumSet.allOf(InstallStage.class));
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public static List<InstallStage> getStages() {
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return new ArrayList<>(STAGES);
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}
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@Override
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public InstallStage getFirstStage() {
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return STAGES.get(0);
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}
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@Override
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public InstallStage getLastStage() {
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return STAGES.get(STAGES.size() - 1);
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}
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@Override
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public List<InstallStage> getSortedStage() {
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return getStages();
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}
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@Override
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public InstallStage upgradeTo() {
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if (getLastStage() == this) {
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return this;
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}
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return getStage(STAGES, 1);
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}
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@Override
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public InstallStage downgrade() {
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if (getFirstStage() == this) {
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return this;
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}
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return getStage(STAGES, -1);
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}
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}

‎javademo/src/main/java/enums/Stage.java

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package enums;
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import java.util.List;
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/**
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*
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*/
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public interface Stage<T extends Enum> {
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/**
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* Check this enum is whether greater than other or not
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*/
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default boolean isGraterThan(T other) {
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return ((Enum) this).compareTo(other) > 0;
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}
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/**
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* Check this enum is whether less than other or not
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*/
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default boolean isLessThan(T other) {
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return ((Enum) this).compareTo(other) < 0;
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}
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default T getStage(List<T> stages, int delta) {
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if (stages == null || stages.isEmpty()) {
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throw new IllegalArgumentException("stages must be not empty");
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}
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int targetIdx = stages.indexOf(this) + delta;
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if (targetIdx < 0 || targetIdx >= stages.size()) {
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throw new IllegalArgumentException("Invalid index " + targetIdx + ". it is out of bounds stages");
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}
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return stages.get(targetIdx);
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}
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/**
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* Getting first stage
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*/
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T getFirstStage();
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/**
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* Getting last stage
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*/
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T getLastStage();
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/**
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* Getting sorted stage enums (asc)
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*/
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List<T> getSortedStage();
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/**
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* Getting next stage
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*/
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T upgradeTo();
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/**
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* Getting prev stage
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*/
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T downgrade();
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}

‎javademo/src/test/java/enums/EnumCompareTests.java

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Original file line numberDiff line numberDiff line change
@@ -11,7 +11,6 @@ public void compareTo() {
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assertTrue(TestEnums.COMPLETE.compareTo(TestEnums.STARTED) < 0);
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}
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public enum TestEnums {
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COMPLETE, STARTING, STARTED, STOPPING, STOPPED;
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}
Lines changed: 40 additions & 0 deletions
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package enums;
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import static org.junit.Assert.assertTrue;
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import java.util.List;
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import java.util.stream.IntStream;
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import org.junit.Test;
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/**
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*
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*/
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public class StageTests {
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@Test
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public void testStageEnums() {
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List<InstallStage> stages = InstallStage.getStages();
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InstallStage prevStage = null;
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int remain = stages.size();
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for (int i = 0; i < stages.size(); i++) {
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InstallStage currentStage = stages.get(i);
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if (i == 0) {
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assertTrue(currentStage == currentStage.getFirstStage());
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assertTrue(currentStage == currentStage.downgrade());
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} else if (i == stages.size() - 1) {
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assertTrue(currentStage == currentStage.getLastStage());
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assertTrue(currentStage == currentStage.upgradeTo());
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} else {
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assertTrue(currentStage.isGraterThan(prevStage));
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assertTrue(currentStage.downgrade() == prevStage);
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}
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prevStage = currentStage;
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remain--;
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}
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assertTrue(remain == 0);
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}
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}

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