feat: added classes

webcal/src/main/java/com/onixbyte/icalendar/calendar/property/CalendarProperty.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.calendar.property;
+
+import com.onixbyte.icalendar.property.CalendarResolvable;
+
+public interface CalendarProperty extends CalendarResolvable {
+}

webcal/src/main/java/com/onixbyte/icalendar/calendar/property/CalendarScale.java

@@ -15,16 +15,14 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.calendar;
-
-import com.onixbyte.icalendar.property.Prop;
+package com.onixbyte.icalendar.calendar.property;
 
 /**
  * CalendarScale
  *
  * @author Zihlu WANG
  */
-public enum CalendarScale implements Prop {
+public enum CalendarScale implements CalendarProperty {
 
     GREGORIAN,
     ;

webcal/src/main/java/com/onixbyte/icalendar/calendar/property/Method.java

@@ -15,11 +15,9 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.calendar;
+package com.onixbyte.icalendar.calendar.property;
 
-import com.onixbyte.icalendar.property.Prop;
-
-public enum Method implements Prop {
+public enum Method implements CalendarProperty {
 
     PUBLISH("PUBLISH"),
     REQUEST("REQUEST"),

webcal/src/main/java/com/onixbyte/icalendar/calendar/property/ProductIdentifier.java

@@ -15,18 +15,16 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.calendar;
-
-import com.onixbyte.icalendar.property.Prop;
+package com.onixbyte.icalendar.calendar.property;
 
 /**
  * ProductIdentifier
  *
  * @author Zihlu WANG
  */
-public final class ProductIdentifier implements Prop {
+public final class ProductIdentifier implements CalendarProperty {
 
-    private String value;
+    private final String value;
 
     @Override
     public String resolve() {
@@ -34,29 +32,28 @@ public final class ProductIdentifier implements Prop {
     }
 
     public static class Builder {
-        private final ProductIdentifier productIdentifier;
+        private String productIdentifier;
 
         private Builder() {
-            this.productIdentifier = new ProductIdentifier();
         }
 
         public Builder productIdentifier(String productIdentifier) {
-            this.productIdentifier.value = productIdentifier;
+            this.productIdentifier = productIdentifier;
             return this;
         }
 
         public Builder productIdentifier(String companyName, String productName) {
-            this.productIdentifier.value = "-//" + companyName + "//" + productName + "//EN";
+            this.productIdentifier = "-//" + companyName + "//" + productName + "//EN";
             return this;
         }
 
         public Builder productIdentifier(String companyName, String productName, String languageTag) {
-            this.productIdentifier.value = "-//" + companyName + "//" + productName + "//" + languageTag;
+            this.productIdentifier = "-//" + companyName + "//" + productName + "//" + languageTag;
             return this;
         }
 
         public ProductIdentifier build() {
-            return productIdentifier;
+            return new ProductIdentifier(productIdentifier);
         }
     }
 
@@ -66,6 +63,7 @@ public final class ProductIdentifier implements Prop {
 
     private static final String PROPERTY_NAME = "PRODID";
 
-    private ProductIdentifier() {
+    private ProductIdentifier(String value) {
+        this.value = value;
     }
 }

webcal/src/main/java/com/onixbyte/icalendar/calendar/property/Version.java

@@ -15,16 +15,14 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.calendar;
-
-import com.onixbyte.icalendar.property.Prop;
+package com.onixbyte.icalendar.calendar.property;
 
 /**
  * Version
  *
  * @author Zihlu WANG
  */
-public enum Version implements Prop {
+public enum Version implements CalendarProperty {
 
     VERSION_2_0,
     ;

webcal/src/main/java/com/onixbyte/icalendar/component/Calendar.java

@@ -17,10 +17,10 @@
 
 package com.onixbyte.icalendar.component;
 
-import com.onixbyte.icalendar.property.calendar.CalendarScale;
-import com.onixbyte.icalendar.property.calendar.Method;
-import com.onixbyte.icalendar.property.calendar.ProductIdentifier;
-import com.onixbyte.icalendar.property.calendar.Version;
+import com.onixbyte.icalendar.calendar.property.CalendarScale;
+import com.onixbyte.icalendar.calendar.property.Method;
+import com.onixbyte.icalendar.calendar.property.ProductIdentifier;
+import com.onixbyte.icalendar.calendar.property.Version;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -100,9 +100,7 @@ public final class Calendar {
                 .ifPresent((_method) -> calendarBuilder.append(_method.resolve()).append('\n'));
 
         if (!components.isEmpty()) {
-            for (var component : components) {
-                calendarBuilder.append(component.resolve()).append('\n');
-            }
+            components.forEach(((component) -> calendarBuilder.append(component.resolve()).append('\n')));
         }
 
         calendarBuilder.append("END:").append(COMPONENT_NAME).append('\n');

webcal/src/main/java/com/onixbyte/icalendar/component/CalendarComponent.java

@@ -18,10 +18,12 @@
 package com.onixbyte.icalendar.component;
 
 /**
- * The abstract sealed class {@code WebCalendarNode} represents a node in a web calendar, such as an <a href="">event</a>, a to-do
- * item, or an alarm. It provides common properties and methods for all calendar components and events.
+ * The abstract sealed class {@code WebCalendarNode} represents a node in a web calendar, such as an
+ * <a href="some_link">event</a>, a to-do item, or an alarm. It provides common properties and
+ * methods for all calendar components and events.
  * <p>
- * Subclasses of {@code WebCalendarNode} should implement the {@link #resolve()} method to generate the corresponding iCalendar content for the specific calendar component or event.
+ * Subclasses of {@code WebCalendarNode} should implement the {@link #resolve()} method to generate
+ * the corresponding iCalendar content for the specific calendar component or event.
  *
  * @author Zihlu Wang
  * @version 1.1.0

webcal/src/main/java/com/onixbyte/icalendar/component/Event.java

@@ -17,8 +17,9 @@
 
 package com.onixbyte.icalendar.component;
 
-import com.onixbyte.icalendar.property.component.DateTimeStamp;
-import com.onixbyte.icalendar.property.component.UniqueIdentifier;
+import com.onixbyte.icalendar.component.property.Classification;
+import com.onixbyte.icalendar.component.property.DateTimeStamp;
+import com.onixbyte.icalendar.component.property.UniqueIdentifier;
 
 /**
  * Event
@@ -27,11 +28,39 @@ import com.onixbyte.icalendar.property.component.UniqueIdentifier;
  */
 public class Event extends CalendarComponent {
 
+    /*
+     * The following properties are REQUIRED, but MUST NOT occur more than once.
+     */
+
+    /**
+     *
+     */
     private DateTimeStamp dtStamp;
 
+    /**
+     *
+     */
     private UniqueIdentifier uid;
 
+    /*
+     * The following property is REQUIRED if the component appears in an iCalendar object that
+     * doesn't specify the "METHOD" property; otherwise, it is OPTIONAL; in any case, it MUST NOT
+     * occur more than once.
+     */
 
+    /**
+     *
+     */
+    private DateTimeStamp dtStart;
+
+    /*
+     * The following properties are OPTIONAL, but MUST NOT occur more than once.
+     */
+
+    /**
+     *
+     */
+    private Classification classification;
 
     @Override
     public String resolve() {

webcal/src/main/java/com/onixbyte/icalendar/component/property/Attachment.java

@@ -15,19 +15,19 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.component;
+package com.onixbyte.icalendar.component.property;
 
-import com.onixbyte.icalendar.property.Prop;
 import com.onixbyte.icalendar.property.parameter.FormatType;
 
 import java.net.URI;
+import java.util.Optional;
 
 /**
- * Attach
+ * Attachment
  *
  * @author Zihlu WANG
  */
-public final class Attach implements Prop {
+public final class Attachment implements ComponentProperty {
 
     private FormatType formatType;
 
@@ -35,6 +35,14 @@ public final class Attach implements Prop {
 
     @Override
     public String resolve() {
-        return "";
+        final var attachmentBuilder = new StringBuilder("ATTACH");
+
+        Optional.ofNullable(formatType)
+                .ifPresent((fmtType) -> attachmentBuilder.append(fmtType.resolve()));
+
+        attachmentBuilder.append(":")
+                .append(uri.toString());
+
+        return attachmentBuilder.toString();
     }
 }

webcal/src/main/java/com/onixbyte/icalendar/component/property/Categories.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.component.property;
+
+public class Categories {
+}

webcal/src/main/java/com/onixbyte/icalendar/component/property/Classification.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.component.property;
+
+public enum Classification {
+}

webcal/src/main/java/com/onixbyte/icalendar/component/property/ComponentProperty.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.component.property;
+
+import com.onixbyte.icalendar.property.CalendarResolvable;
+
+public interface ComponentProperty extends CalendarResolvable {
+}

webcal/src/main/java/com/onixbyte/icalendar/component/property/DateTimeCreated.java

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.component;
+package com.onixbyte.icalendar.component.property;
 
 /**
  * DateTimeCreated

webcal/src/main/java/com/onixbyte/icalendar/component/property/DateTimeStamp.java

@@ -15,19 +15,19 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.component;
+package com.onixbyte.icalendar.component.property;
 
+import com.onixbyte.icalendar.calendar.property.Method;
 import com.onixbyte.icalendar.config.Formatters;
-import com.onixbyte.icalendar.property.Prop;
 
 import java.time.LocalDateTime;
 
 /**
  * In the case of an {@link com.onixbyte.icalendar.component.Calendar iCalendar} object that specifies a "{@link
- * com.onixbyte.icalendar.property.calendar.Method Method}" property, this property specifies the date and time that
+ * Method Method}" property, this property specifies the date and time that
  * the instance of the {@link com.onixbyte.icalendar.component.Calendar iCalendar} object was created. In the case of
  * an {@link com.onixbyte.icalendar.component.Calendar iCalendar} object that doesn't specify a "{@link
- * com.onixbyte.icalendar.property.calendar.Method Method}" property, this property specifies the date and time that
+ * Method Method}" property, this property specifies the date and time that
  * the information associated with the calendar component was last revised in the calendar store.
  * <p>
  * The value MUST be specified in the UTC time format.
@@ -37,19 +37,19 @@ import java.time.LocalDateTime;
  * com.onixbyte.icalendar.component.Calendar iCalendar} objects.
  * <p>
  * In the case of an {@link com.onixbyte.icalendar.component.Calendar iCalendar} object that specifies a "{@link
- * com.onixbyte.icalendar.property.calendar.Method Method}" property, this property differs from the "{@link
+ * Method Method}" property, this property differs from the "{@link
  * DateTimeCreated CREATED}" and "{@link LastModified LAST-MODIFIED}" properties. These two properties are used to
  * specify when the particular calendar data in the calendar store was created and last modified. This is different
  * from when the {@link com.onixbyte.icalendar.component.Calendar iCalendar} object representation of the calendar
  * service information was created or last modified.
  * <p>
  * In the case of an {@link com.onixbyte.icalendar.component.Calendar iCalendar} object that specifies a "{@link
- * com.onixbyte.icalendar.property.calendar.Method METHOD}" property, this property is equivalent to the "{@link
+ * Method METHOD}" property, this property is equivalent to the "{@link
  * LastModified LAST-MODIFIED}" property.
  *
  * @author Zihlu WANG
  */
-public final class DateTimeStamp implements Prop {
+public final class DateTimeStamp implements ComponentProperty {
 
     private static final String PROPERTY_NAME = "DTSTAMP";
 

webcal/src/main/java/com/onixbyte/icalendar/component/property/LastModified.java

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.component;
+package com.onixbyte.icalendar.component.property;
 
 /**
  * LastModified

webcal/src/main/java/com/onixbyte/icalendar/component/property/UniqueIdentifier.java

@@ -15,16 +15,14 @@
  * limitations under the License.
  */
 
-package com.onixbyte.icalendar.property.component;
-
-import com.onixbyte.icalendar.property.Prop;
+package com.onixbyte.icalendar.component.property;
 
 /**
  * UniqueIdentifier
  *
  * @author Zihlu WANG
  */
-public final class UniqueIdentifier implements Prop {
+public final class UniqueIdentifier implements ComponentProperty {
 
     private String value;
 

webcal/src/main/java/com/onixbyte/icalendar/datatype/CalendarUserAddress.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.datatype;
+
+import java.net.URI;
+
+public final class CalendarUserAddress  {
+
+    private URI value;
+
+    public CalendarUserAddress(URI value) {
+        if (!"mailto".equalsIgnoreCase(value.getScheme())) {
+            throw new IllegalArgumentException("Calendar User Address (CAL-ADDRESS) only accept mailto URI.");
+        }
+        this.value = value;
+    }
+
+    @Override
+    public String toString() {
+        return value.toString();
+    }
+}

webcal/src/main/java/com/onixbyte/icalendar/property/CalendarResolvable.java

@@ -17,7 +17,7 @@
 
 package com.onixbyte.icalendar.property;
 
-public interface Prop {
+public interface CalendarResolvable {
 
     String resolve();
 

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/AlternateRepresentation.java

@@ -17,7 +17,7 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
-import com.onixbyte.icalendar.property.Prop;
+import com.onixbyte.icalendar.property.CalendarResolvable;
 
 import java.net.URI;
 
@@ -33,33 +33,43 @@ import java.net.URI;
  *
  * @author Zihlu Wang
  */
-public final class AlternateRepresentation implements Prop {
+public final class AlternateRepresentation implements PropertyParameter {
 
     private static final String PROPERTY_NAME = "ALTREP";
 
-    private URI uri;
+    private URI value;
 
-    private AlternateRepresentation() {
-    }
-
-    public AlternateRepresentation setUri(String uri) {
-        this.uri = URI.create(uri);
-        return this;
-    }
-
-    public AlternateRepresentation setUri(URI uri) {
-        this.uri = uri;
-        return this;
-    }
-
-    public static AlternateRepresentation createInstance(String uri) {
-        var instance = new AlternateRepresentation();
-        instance.uri = URI.create(uri);
-        return instance;
+    private AlternateRepresentation(URI uri) {
+        this.value = uri;
     }
 
     @Override
     public String resolve() {
-        return PROPERTY_NAME + "=\"" + uri.toString() + "\"";
+        return PROPERTY_NAME + "=\"" + value.toString() + "\"";
+    }
+
+    public static class Builder {
+        private URI uri;
+
+        private Builder() {
+        }
+
+        public Builder uri(String uri) {
+            this.uri = URI.create(uri);
+            return this;
+        }
+
+        public Builder uri(URI uri) {
+            this.uri = uri;
+            return this;
+        }
+
+        public AlternateRepresentation build() {
+            return new AlternateRepresentation(uri);
+        }
+    }
+
+    public static Builder builder() {
+        return new Builder();
     }
 }

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/CalendarUserType.java

@@ -17,14 +17,14 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
-import com.onixbyte.icalendar.property.Prop;
+import com.onixbyte.icalendar.property.CalendarResolvable;
 
 /**
  * CalendarUserType
  *
  * @author Zihlu WANG
  */
-public enum CalendarUserType implements Prop {
+public enum CalendarUserType implements PropertyParameter {
 
     /**
      * An individual.

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/CommonName.java

@@ -17,7 +17,7 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
-import com.onixbyte.icalendar.property.Prop;
+import com.onixbyte.icalendar.property.CalendarResolvable;
 
 /**
  * Common Name can be specified on properties with a CAL-ADDRESS value type. The parameter
@@ -27,26 +27,38 @@ import com.onixbyte.icalendar.property.Prop;
  *
  * @author Zihlu Wang
  */
-public final class CommonName implements Prop {
+public final class CommonName implements PropertyParameter {
 
-    private String value;
+    private static final String PROPERTY_NAME = "CN";
 
-    private CommonName() {
+    private final String value;
+
+    private CommonName(String value) {
+        this.value = value;
     }
 
-    public CommonName setValue(String value) {
-        this.value = value;
+    public static class Builder {
+        private String value;
+
+        private Builder() {
+        }
+
+        public Builder commonName(String commonName) {
+            this.value = commonName;
             return this;
         }
 
-    public static CommonName createInstance(String commonName) {
-        var instance = new CommonName();
-        instance.value = commonName;
-        return instance;
+        public CommonName build() {
+            return new CommonName(value);
+        }
+    }
+
+    public static Builder builder() {
+        return new Builder();
     }
 
     @Override
     public String resolve() {
-        return "CN=\"" + this.value + "\"";
+        return PROPERTY_NAME + "=\"" + this.value + "\"";
     }
 }

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/Delegatee.java

@@ -17,10 +17,49 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
+import com.onixbyte.icalendar.datatype.CalendarUserAddress;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Delegate
  *
  * @author Zihlu WANG
  */
-public class Delegatee {
+public final class Delegatee implements PropertyParameter {
+
+    private static final String PROPERTY_NAME = "DELEGATED-TO";
+
+    private final List<CalendarUserAddress> value;
+
+    private Delegatee(List<CalendarUserAddress> value) {
+        this.value = value;
+    }
+
+    public static class Builder {
+        private List<CalendarUserAddress> value;
+
+        private Builder() {
+            this.value = new ArrayList<>();
+        }
+
+        public Builder addDelegatee(URI delegateeUri) {
+            value.add(new CalendarUserAddress(delegateeUri));
+            return this;
+        }
+
+        public Delegatee build() {
+            return new Delegatee(value);
+        }
+    }
+
+    @Override
+    public String resolve() {
+        return PROPERTY_NAME + "=" + String.join(",", value
+                .stream()
+                .map((_value) -> "\"" + _value + "\"")
+                .toList());
+    }
 }

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/Delegator.java

@@ -17,7 +17,7 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
-import com.onixbyte.icalendar.property.Prop;
+import com.onixbyte.icalendar.property.CalendarResolvable;
 
 import java.net.URI;
 
@@ -26,7 +26,7 @@ import java.net.URI;
  *
  * @author Zihlu WANG
  */
-public final class Delegator implements Prop {
+public final class Delegator implements PropertyParameter {
 
     private static final String PROPERTY_NAME = "DELEGATED-FROM";
 

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/FormatType.java

@@ -17,14 +17,14 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
-import com.onixbyte.icalendar.property.Prop;
+import com.onixbyte.icalendar.property.CalendarResolvable;
 
 /**
  * FormatType
  *
  * @author Zihlu WANG
  */
-public enum FormatType implements Prop {
+public enum FormatType implements PropertyParameter {
 
     JSON("application/json"),
 

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/Language.java

@@ -17,10 +17,257 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
+import com.onixbyte.icalendar.property.CalendarResolvable;
+
 /**
  * Language
  *
  * @author Zihlu WANG
  */
-public class Language {
+public enum Language implements PropertyParameter {
+
+    AFRIKAANS("af"),
+    SOUTH_AFRICA_AFRIKAANS("af-ZA"),
+    ARABIC("ar"),
+    UAE_ARABIC("ar-AE"),
+    BAHRAIN_ARABIC("ar-BH"),
+    ALGERIA_ARABIC("ar-DZ"),
+    EGYPT_ARABIC("ar-EG"),
+    IRAQ_ARABIC("ar-IQ"),
+    JORDAN_ARABIC("ar-JO"),
+    KUWAIT_ARABIC("ar-KW"),
+    LEBANON_ARABIC("ar-LB"),
+    LIBYA_ARABIC("ar-LY"),
+    MOROCCO_ARABIC("ar-MA"),
+    OMAN_ARABIC("ar-OM"),
+    QATAR_ARABIC("ar-QA"),
+    SAUDI_ARABIA_ARABIC_("ar-SA"),
+    SYRIA_ARABIC("ar-SY"),
+    TUNISIA_ARABIC("ar-TN"),
+    YEMEN_ARABIC("ar-YE"),
+    LATIN_AZERI("az"),
+    AZERBAIJAN_LATIN_AZERI("az-AZ"),
+    AZERBAIJAN_CYRILLIC_AZERI("az-Cyrl-AZ"),
+    BELARUSIAN("be"),
+    BELARUS_BELARUSIAN("be-BY"),
+    BULGARIAN("bg"),
+    BULGARIA_BULGARIAN("bg-BG"),
+    BOSNIA_AND_HERZEGOVINA_BOSNIAN("bs-BA"),
+    CATALAN("ca"),
+    SPAIN_CATALAN("ca-ES"),
+    CZECH("cs"),
+    CZECH_REPUBLIC_CZECH("cs-CZ"),
+    WELSH("cy"),
+    UNITED_KINGDOM_WELSH("cy-GB"),
+    DANISH("da"),
+    DENMARK_DANISH("da-DK"),
+    GERMAN("de"),
+    AUSTRIA_GERMAN("de-AT"),
+    SWITZERLAND_GERMAN("de-CH"),
+    GERMANY_GERMAN("de-DE"),
+    LIECHTENSTEIN_GERMAN("de-LI"),
+    LUXEMBOURG_GERMAN("de-LU"),
+    DIVEHI("dv"),
+    MALDIVES_DIVEHI("dv-MV"),
+    GREEK("el"),
+    GREECE_GREEK("el-GR"),
+    ENGLISH("en"),
+    AUSTRALIA_ENGLISH("en-AU"),
+    BELIZE_ENGLISH("en-BZ"),
+    CANADA_ENGLISH("en-CA"),
+    CARIBBEAN_ENGLISH("en-CB"),
+    UNITED_KINGDOM_ENGLISH("en-GB"),
+    IRELAND_ENGLISH("en-IE"),
+    JAMAICA_ENGLISH("en-JM"),
+    NEW_ZEALAND_ENGLISH("en-NZ"),
+    PHILIPPINES_ENGLISH("en-PH"),
+    TRINIDAD_AND_TOBAGO_ENGLISH("en-TT"),
+    UNITED_STATES_ENGLISH("en-US"),
+    SOUTH_AFRICA_ENGLISH("en-ZA"),
+    ZIMBABWE_ENGLISH("en-ZW"),
+    ESPERANTO("eo"),
+    SPANISH("es"),
+    ARGENTINA_SPANISH("es-AR"),
+    BOLIVIA_SPANISH("es-BO"),
+    CHILE_SPANISH("es-CL"),
+    COLOMBIA_SPANISH("es-CO"),
+    COSTA_RICA_SPANISH("es-CR"),
+    DOMINICAN_REPUBLIC_SPANISH("es-DO"),
+    ECUADOR_SPANISH("es-EC"),
+    SPAIN_SPANISH("es-ES"),
+    GUATEMALA_SPANISH("es-GT"),
+    HONDURAS_SPANISH("es-HN"),
+    MEXICO_SPANISH("es-MX"),
+    NICARAGUA_SPANISH("es-NI"),
+    PANAMA_SPANISH("es-PA"),
+    PERU_SPANISH("es-PE"),
+    PUERTO_RICO_SPANISH("es-PR"),
+    PARAGUAY_SPANISH("es-PY"),
+    EL_SALVADOR_SPANISH("es-SV"),
+    URUGUAY_SPANISH("es-UY"),
+    VENEZUELA_SPANISH("es-VE"),
+    ESTONIAN("et"),
+    ESTONIA_ESTONIAN("et-EE"),
+    BASQUE("eu"),
+    SPAIN_BASQUE("eu-ES"),
+    FARSI("fa"),
+    IRAN_FARSI("fa-IR"),
+    FINNISH("fi"),
+    FINLAND_FINNISH("fi-FI"),
+    FAROESE("fo"),
+    FAROE_ISLANDS_FAROESE("fo-FO"),
+    FRENCH("fr"),
+    BELGIUM_FRENCH("fr-BE"),
+    CANADA_FRENCH("fr-CA"),
+    SWITZERLAND_FRENCH("fr-CH"),
+    FRANCE_FRENCH("fr-FR"),
+    LUXEMBOURG_FRENCH("fr-LU"),
+    MONACO_FRENCH("fr-MC"),
+    GALICIAN("gl"),
+    SPAIN_GALICIAN("gl-ES"),
+    GUJARATI("gu"),
+    INDIA_GUJARATI("gu-IN"),
+    HEBREW("he"),
+    ISRAEL_HEBREW("he-IL"),
+    HINDI("hi"),
+    INDIA_HINDI("hi-IN"),
+    CROATIAN("hr"),
+    BOSNIA_AND_HERZEGOVINA_CROATIAN("hr-BA"),
+    CROATIA_CROATIAN("hr-HR"),
+    HUNGARIAN("hu"),
+    HUNGARY_HUNGARIAN("hu-HU"),
+    ARMENIAN("hy"),
+    ARMENIA_ARMENIAN("hy-AM"),
+    INDONESIAN("id"),
+    INDONESIA_INDONESIAN("id-ID"),
+    ICELANDIC("is"),
+    ICELAND_ICELANDIC("is-IS"),
+    ITALIAN("it"),
+    SWITZERLAND_ITALIAN("it-CH"),
+    ITALY_ITALIAN("it-IT"),
+    JAPANESE("ja"),
+    JAPAN_JAPANESE("ja-JA"),
+    GEORGIAN("ka"),
+    GEORGIA_GEORGIAN("ka-GE"),
+    KAZAKH("kk"),
+    KAZAKHSTAN_KAZAKH("kk-KZ"),
+    KANNADA("kn"),
+    INDIA_KANNADA("kn-IN"),
+    KOREAN("ko"),
+    KOREA_KOREAN("ko-KR"),
+    KONKANI("kok"),
+    INDIA_KONKANI("kok-IN"),
+    KYRGYZ("ky"),
+    KYRGYZSTAN_KYRGYZ("ky-KG"),
+    LITHUANIAN("lt"),
+    LITHUANIA_LITHUANIAN("lt-LT"),
+    LATVIAN("lv"),
+    LATVIA_LATVIAN("lv-LV"),
+    MAORI("mi"),
+    NEW_ZEALAND_MAORI("mi-NZ"),
+    FYRO_MACEDONIAN("mk"),
+    MACEDONIA_FYRO_MACEDONIAN("mk-MK"),
+    MONGOLIAN("mn"),
+    MONGOLIA_MONGOLIAN("mn-MN"),
+    MARATHI("mr"),
+    INDIA_MARATHI("mr-IN"),
+    MALAY("ms"),
+    BRUNEI_DARUSSALAM_MALAY("ms-BN"),
+    MALAYSIA_MALAY("ms-MY"),
+    MALTESE("mt"),
+    MALTA_MALTESE("mt-MT"),
+    NORWEGIAN("nb"),
+    NORWAY_NORWEGIAN("nb-NO"),
+    DUTCH("nl"),
+    BELGIUM_DUTCH("nl-BE"),
+    NETHERLANDS_DUTCH("nl-NL"),
+    NORWAY_NYNORSK_NORWEGIAN("nn-NO"),
+    NORTHERN_SOTHO("ns"),
+    SOUTH_AFRICA_NORTHERN_SOTHO("ns-ZA"),
+    PUNJABI("pa"),
+    INDIA_PUNJABI("pa-IN"),
+    POLISH("pl"),
+    POLAND_POLISH("pl-PL"),
+    PASHTO("pt"),
+    AFGHANISTAN_PASHTO("ps-AR"),
+    PORTUGUESE("pt"),
+    BRAZIL_PORTUGUESE("pt-BR"),
+    PORTUGAL_PORTUGUESE("pt-PT"),
+    QUECHUA("qu"),
+    BOLIVIA_QUECHUA("qu-BO"),
+    ECUADOR_QUECHUA("qu-EC"),
+    PERU_QUECHUA("qu-PE"),
+    ROMANIAN("ro"),
+    ROMANIA_ROMANIAN("ro-RO"),
+    RUSSIAN("ru"),
+    RUSSIA_RUSSIAN("ru-RU"),
+    SANSKRIT("sa"),
+    INDIA_SANSKRIT("sa-IN"),
+    SAMI("se"),
+    FINLAND_SAMI("se-FI"),
+    NORWAY_SAMI("se-NO"),
+    SWEDEN_SAMI("se-SE"),
+    SLOVAK("sk"),
+    SLOVAKIA_SLOVAK("sk-SK"),
+    SLOVENIAN("sl"),
+    SLOVENIA_SLOVENIAN("sl-SI"),
+    ALBANIAN("sq"),
+    ALBANIA_ALBANIAN("sq-AL"),
+    BOSNIA_AND_HERZEGOVINA_LATIN_SERBIAN("sr-BA"),
+    BOSNIA_AND_HERZEGOVINA_CYRILLIC_SERBIAN("sr-Cyrl-BA"),
+    SERBIA_AND_MONTENEGRO_LATIN_SERBIAN("sr-SP"),
+    SERBIA_AND_MONTENEGRO_CYRILLIC_SERBIAN("sr-Cyrl-SP"),
+    SWEDISH("sv"),
+    FINLAND_SWEDISH("sv-FI"),
+    SWEDEN_SWEDISH("sv-SE"),
+    SWAHILI("sw"),
+    KENYA_SWAHILI("sw-KE"),
+    SYRIAC("syr"),
+    SYRIA_SYRIAC("syr-SY"),
+    TAMIL("ta"),
+    INDIA_TAMIL("ta-IN"),
+    TELUGU("te"),
+    INDIA_TELUGU("te-IN"),
+    THAI("th"),
+    THAILAND_THAI("th-TH"),
+    TAGALOG("tl"),
+    PHILIPPINES_TAGALOG("tl-PH"),
+    TSWANA("tn"),
+    SOUTH_AFRICA_TSWANA("tn-ZA"),
+    TURKISH("tr"),
+    TURKEY_TURKISH("tr-TR"),
+    TATAR("tt"),
+    RUSSIA_TATAR("tt-RU"),
+    TSONGA("ts"),
+    UKRAINIAN("uk"),
+    UKRAINE_UKRAINIAN("uk-UA"),
+    URDU("ur"),
+    PAKISTAN_URDU("ur-PK"),
+    UZBEK("uz"),
+    UZBEKISTAN_UZBEK("uz-UZ"),
+    UZBEKISTAN_CYRILLIC_UZBEK("uz-Cyrl-UZ"),
+    VIETNAMESE("vi"),
+    VIETNAM_VIETNAMESE("vi-VN"),
+    XHOSA("xh"),
+    SOUTH_AFRICA_XHOSA("xh-ZA"),
+    CHINESE("zh"),
+    SIMPLIFIED_CHINESE("zh-CN"),
+    HONG_KONG_CHINESE("zh-HK"),
+    MACAU_CHINESE("zh-MO"),
+    SINGAPORE_CHINESE("zh-SG"),
+    TRADITIONAL_CHINESE("zh-TW"),
+    ZULU("zu"),
+    SOUTH_AFRICA_ZULU("zu-ZA")
+    ;
+
+    private final String value;
+
+    Language(String value) {
+        this.value = value;
+    }
+
+    @Override
+    public String resolve() {
+        return "LANGUAGE=" + value;
+    }
 }

webcal/src/main/java/com/onixbyte/icalendar/property/parameter/PropertyParameter.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2024-2024 OnixByte.
+ *
+ * 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 com.onixbyte.icalendar.property.parameter;
+
+import com.onixbyte.icalendar.property.CalendarResolvable;
+
+public interface PropertyParameter extends CalendarResolvable {
+}