Create enum property type, trivial code simplification

src/main/java/fr/xephi/authme/settings/custom/DatabaseSettings.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.settings.custom;
 
+import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.settings.custom.domain.Comment;
 import fr.xephi.authme.settings.custom.domain.Property;
 import fr.xephi.authme.settings.custom.domain.SettingsClass;
@@ -12,8 +13,8 @@ public class DatabaseSettings implements SettingsClass {
 
 	@Comment({"What type of database do you want to use?",
 			"Valid values: sqlite, mysql"})
-    public static final Property<String> BACKEND =
-        newProperty(STRING, "DataSource.backend", "sqlite");
+    public static final Property<DataSource.DataSourceType> BACKEND =
+        newProperty(DataSource.DataSourceType.class, "DataSource.backend", DataSource.DataSourceType.SQLITE);
 
 	@Comment("Enable database caching, should improve database performance")
     public static final Property<Boolean> USE_CACHING =

src/main/java/fr/xephi/authme/settings/custom/NewSetting.java

@@ -28,8 +28,6 @@ public class NewSetting {
         ConverterSettings.class, DatabaseSettings.class, EmailSettings.class, HooksSettings.class,
         ProtectionSettings.class, PurgeSettings.class, SecuritySettings.class);
 
-    private static final int YAML_INDENTATION = 4;
-
     private File file;
     private YamlConfiguration configuration;
 
@@ -75,7 +73,7 @@ public class NewSetting {
                 if (newPathParts.size() > 1) {
                     for (String path : newPathParts.subList(0, newPathParts.size() - 1)) {
                         writer.append("\n")
-                            .append(StringUtils.repeat(" ", indentationLevel * YAML_INDENTATION))
+                            .append(indent(indentationLevel))
                             .append(path)
                             .append(": ");
                         ++indentationLevel;
@@ -83,12 +81,12 @@ public class NewSetting {
                 }
                 for (String comment : entry.getValue()) {
                     writer.append("\n")
-                        .append(StringUtils.repeat(" ", indentationLevel * YAML_INDENTATION))
+                        .append(indent(indentationLevel))
                         .append("# ")
                         .append(comment);
                 }
                 writer.append("\n")
-                    .append(StringUtils.repeat(" ", indentationLevel * YAML_INDENTATION))
+                    .append(indent(indentationLevel))
                     .append(CollectionUtils.getRange(newPathParts, newPathParts.size() - 1).get(0))
                     .append(": ");
 
@@ -96,7 +94,7 @@ public class NewSetting {
                 String delim = "";
                 for (String yamlLine : yamlLines) {
                     writer.append(delim).append(yamlLine);
-                    delim = "\n" + StringUtils.repeat(" ", indentationLevel * YAML_INDENTATION);
+                    delim = "\n" + indent(indentationLevel);
                 }
 
                 currentPath = propertyPath.subList(0, propertyPath.size() - 1);
@@ -109,6 +107,15 @@ public class NewSetting {
         }
     }
 
+    private static String indent(int level) {
+        // YAML uses indentation of 4 spaces
+        StringBuilder sb = new StringBuilder(level * 4);
+        for (int i = 0; i < level; ++i) {
+            sb.append("    ");
+        }
+        return sb.toString();
+    }
+
     private static PropertyMap getAllPropertyFields() {
         PropertyMap properties = new PropertyMap();
         for (Class<?> clazz : CONFIGURATION_CLASSES) {

src/main/java/fr/xephi/authme/settings/custom/domain/Property.java

@@ -31,6 +31,10 @@ public class Property<T> {
         return new Property<>(type, path, Arrays.asList(defaultValues));
     }
 
+    public static <E extends Enum<E>> Property<E> newProperty(Class<E> clazz, String path, E defaultValue) {
+        return new Property<>(new PropertyType.EnumProperty<>(clazz), path, defaultValue);
+    }
+
     // -----
     // Overloaded convenience methods for specific types
     // -----

src/main/java/fr/xephi/authme/settings/custom/domain/PropertyType.java

@@ -143,4 +143,40 @@ public abstract class PropertyType<T> {
         }
     }
 
+    /**
+     * Enum property.
+     * @param <E> The enum class
+     */
+    static final class EnumProperty<E extends Enum<E>> extends PropertyType<E> {
+        private Class<E> clazz;
+
+        public EnumProperty(Class<E> clazz) {
+            this.clazz = clazz;
+        }
+
+        @Override
+        public E getFromFile(Property<E> property, YamlConfiguration configuration) {
+            String textValue = configuration.getString(property.getPath());
+            if (textValue == null) {
+                return property.getDefaultValue();
+            }
+            E mappedValue = mapToEnum(textValue);
+            return mappedValue != null ? mappedValue : property.getDefaultValue();
+        }
+
+        @Override
+        protected List<String> asYaml(E value) {
+            return asList("'" + value + "'");
+        }
+
+        private E mapToEnum(String value) {
+            for (E entry : clazz.getEnumConstants()) {
+                if (entry.name().equalsIgnoreCase(value)) {
+                    return entry;
+                }
+            }
+            return null;
+        }
+    }
+
 }

src/main/java/fr/xephi/authme/util/CollectionUtils.java

@@ -60,15 +60,13 @@ public final class CollectionUtils {
         return coll == null || coll.isEmpty();
     }
 
-    public static <T> List<T> filterCommonStart(List<T> coll1, List<T> coll2) {
+    public static <T> List<T> filterCommonStart(List<T> list1, List<T> list2) {
         List<T> commonStart = new ArrayList<>();
-        int minSize = Math.min(coll1.size(), coll2.size());
-        for (int i = 0; i < minSize; ++i) {
-            if (Objects.equals(coll1.get(i), coll2.get(i))) {
-                commonStart.add(coll1.get(i));
-            } else {
-                break;
-            }
+        int minSize = Math.min(list1.size(), list2.size());
+        int i = 0;
+        while (i < minSize && Objects.equals(list1.get(i), list2.get(i))) {
+            commonStart.add(list1.get(i));
+            ++i;
         }
         return commonStart;
     }

src/main/java/fr/xephi/authme/util/StringUtils.java

@@ -117,12 +117,4 @@ public final class StringUtils {
         return "[" + th.getClass().getSimpleName() + "]: " + th.getMessage();
     }
 
-    public static String repeat(String str, int times) {
-        StringBuilder sb = new StringBuilder(str.length() * times);
-        for (int i = 0; i < times; ++i) {
-            sb.append(str);
-        }
-        return sb.toString();
-    }
-
 }

src/test/java/fr/xephi/authme/settings/custom/NewSettingTest.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.settings.custom;
 
+import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.settings.custom.domain.Property;
 import fr.xephi.authme.settings.custom.domain.PropertyType;
 import org.bukkit.configuration.file.YamlConfiguration;
@@ -83,12 +84,14 @@ public class NewSettingTest {
         String helpHeader = settings.getOption(newProperty("settings.helpHeader", ""));
         List<String> unsafePasswords = settings.getOption(
             newProperty(PropertyType.STRING_LIST, "Security.unsafePasswords"));
+        DataSource.DataSourceType dataSourceType = settings.getOption(DatabaseSettings.BACKEND);
 
         // then
         assertThat(result, equalTo(22));
         assertThat(systemName, equalTo(TestConfiguration.SYSTEM_NAME.getDefaultValue()));
         assertThat(helpHeader, equalTo("AuthMeReloaded"));
         assertThat(unsafePasswords, contains("123456", "qwerty", "54321"));
+        assertThat(dataSourceType, equalTo(DataSource.DataSourceType.MYSQL));
     }
 
     private File getConfigFile() {

src/test/resources/437-config-test.yml

@@ -3,7 +3,7 @@ test:
 DataSource:
     # What type of database do you want to use?
     # Valid values: sqlite, mysql
-    backend: sqlite
+    backend: mysql
     # Enable database caching, should improve database performance
     caching: true
 settings: