Immutable calendar hierarchy

jollyday-core/src/main/java/de/focus_shift/jollyday/core/CalendarHierarchy.java

@@ -3,30 +3,33 @@
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Objects;
+import java.util.StringJoiner;
 
 import static de.focus_shift.jollyday.core.util.ResourceUtil.UNDEFINED;
 import static de.focus_shift.jollyday.core.util.ResourceUtil.getCountryDescription;
 
 /**
  * Bean class for describing the configuration hierarchy.
  */
-public class CalendarHierarchy {
+public final class CalendarHierarchy {
 
   private final String id;
-  private Map<String, CalendarHierarchy> children = new HashMap<>();
   private final CalendarHierarchy parent;
-  private String fallbackDescription;
+  private final String fallbackDescription;
+  private final Map<String, CalendarHierarchy> children = new HashMap<>();
 
   /**
    * Constructor which takes a eventually existing parent hierarchy node and
    * the ID of this hierarchy.
    *
+   * @param id     a {@link String} object.
    * @param parent a {@link CalendarHierarchy} object.
-   * @param id     a {@link java.lang.String} object.
    */
-  public CalendarHierarchy(final CalendarHierarchy parent, final String id) {
-    this.parent = parent;
+  public CalendarHierarchy(final String id, final String fallbackDescription, final CalendarHierarchy parent) {
     this.id = id;
+    this.parent = parent;
+    this.fallbackDescription = fallbackDescription;
   }
 
   /**
@@ -60,63 +63,50 @@ public String getDescription(Locale locale) {
   }
 
   /**
-   * Recursively returns the properties key to retrieve the description from
-   * the localized resource bundle.
+   * <p>
+   * Getter for the field <code>children</code>.
+   * </p>
    *
-   * @return
+   * @return the children
    */
-  private String getPropertiesKey() {
-    if (parent != null) {
-      return parent.getPropertiesKey() + "." + getId();
-    }
-    return getId();
+  public Map<String, CalendarHierarchy> getChildren() {
+    return children;
   }
 
-  /**
-   * {@inheritDoc}
-   * <p>
-   * Compares Hierarchies by id.
-   */
   @Override
-  public boolean equals(final Object obj) {
-    if (obj instanceof CalendarHierarchy) {
-      return ((CalendarHierarchy) obj).getId().equals(this.getId());
+  public boolean equals(Object obj) {
+    if (!(obj instanceof CalendarHierarchy)) {
+      return false;
     }
-    return super.equals(obj);
+
+    final CalendarHierarchy that = (CalendarHierarchy) obj;
+    return Objects.equals(id, that.id);
   }
 
   @Override
   public int hashCode() {
-    return getId().hashCode();
+    return Objects.hashCode(id);
   }
 
-  /**
-   * <p>
-   * Setter for the field <code>children</code>.
-   * </p>
-   *
-   * @param children the children to set
-   */
-  public void setChildren(final Map<String, CalendarHierarchy> children) {
-    this.children = children;
-  }
-
-  /**
-   * <p>
-   * Getter for the field <code>children</code>.
-   * </p>
-   *
-   * @return the children
-   */
-  public Map<String, CalendarHierarchy> getChildren() {
-    return children;
+  @Override
+  public String toString() {
+    return new StringJoiner(", ", CalendarHierarchy.class.getSimpleName() + "[", "]")
+      .add("id='" + id + "'")
+      .add("parentId='" + (parent != null ? parent.getId() : "") + "'")
+      .add("description='" + getDescription() + "'")
+      .add("children=" + children)
+      .toString();
   }
 
   /**
-   * @param description the fallback description
+   * Recursively returns the properties key to retrieve the description from
+   * the localized resource bundle.
    */
-  public void setFallbackDescription(final String description) {
-    this.fallbackDescription = description;
+  private String getPropertiesKey() {
+    if (parent != null) {
+      return parent.getPropertiesKey() + "." + getId();
+    }
+    return getId();
   }
 
   private String receiveFallbackDescription(final String description) {

jollyday-core/src/main/java/de/focus_shift/jollyday/core/impl/DefaultHolidayManager.java

@@ -164,7 +164,7 @@ public Set<Holiday> getHolidays(final LocalDate startDateInclusive, final LocalD
    */
   @Override
   public CalendarHierarchy getCalendarHierarchy() {
-    return createConfigurationHierarchy(configuration, null);
+    return createConfigurationHierarchy(configuration, null, null);
   }
 
   /**
@@ -329,15 +329,15 @@ protected static void validateConfigurationHierarchy(final Configuration configu
    * @param calendarHierarchy the calendars hierarchy
    * @return configuration hierarchy
    */
-  private static CalendarHierarchy createConfigurationHierarchy(final Configuration configuration, final CalendarHierarchy calendarHierarchy) {
-    final CalendarHierarchy hierarchy = new CalendarHierarchy(calendarHierarchy, configuration.hierarchy());
-    hierarchy.setFallbackDescription(configuration.description());
-    configuration.subConfigurations()
-      .forEach(subConfiguration -> {
-          final CalendarHierarchy subHierarchy = createConfigurationHierarchy(subConfiguration, hierarchy);
-          hierarchy.getChildren().put(subHierarchy.getId(), subHierarchy);
-        }
-      );
+  private static CalendarHierarchy createConfigurationHierarchy(final Configuration configuration, final CalendarHierarchy calendarHierarchy, final String fallbackDescription) {
+    final String description = configuration.description() != null ? configuration.description() : fallbackDescription;
+    final CalendarHierarchy hierarchy = new CalendarHierarchy(configuration.hierarchy(), description, calendarHierarchy);
+
+    configuration.subConfigurations().forEach(subConfiguration -> {
+      final CalendarHierarchy subHierarchy = createConfigurationHierarchy(subConfiguration, hierarchy, subConfiguration.description());
+      hierarchy.getChildren().put(subHierarchy.getId(), subHierarchy);
+    });
+
     return hierarchy;
   }
 }

jollyday-tests/src/test/java/de/focus_shift/jollyday/tests/CalendarHierarchyTest.java

@@ -0,0 +1,19 @@
+package de.focus_shift.jollyday.tests;
+
+import de.focus_shift.jollyday.core.HolidayCalendar;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+
+import static de.focus_shift.jollyday.core.HolidayManager.getInstance;
+import static de.focus_shift.jollyday.core.ManagerParameters.create;
+
+class CalendarHierarchyTest {
+
+  @Test
+  void name() {
+    Arrays.stream(HolidayCalendar.values()).forEach(holidayCalendar -> {
+      System.out.println(getInstance(create(holidayCalendar)).getCalendarHierarchy());
+    });
+  }
+}