style: optimised delegator

Author: zihluwang

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

@@ -17,9 +17,13 @@
 
 package com.onixbyte.icalendar.property.parameter;
 
+import com.onixbyte.icalendar.datatype.CalendarUserAddress;
 import com.onixbyte.icalendar.property.CalendarResolvable;
 
 import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
 
 /**
  * Delegator
@@ -30,35 +34,58 @@ public final class Delegator implements PropertyParameter {
 
     private static final String PROPERTY_NAME = "DELEGATED-FROM";
 
-    private URI calendarUserAddress;
+    private List<CalendarUserAddress> value;
 
-    private Delegator() {
+    private Delegator(List<CalendarUserAddress> value) {
+        this.value = value;
     }
 
-    private Delegator setCalendarUserAddress(String calendarUserAddress) {
-        this.calendarUserAddress = URI.create(calendarUserAddress);
-        return this;
+    public static Builder builder() {
+        return new Builder();
     }
 
-    private Delegator setCalendarUserAddress(URI calendarUserAddress) {
-        this.calendarUserAddress = calendarUserAddress;
-        return this;
-    }
+    public static class Builder {
+        private List<CalendarUserAddress> value;
 
-    private static Delegator initialiseInstance() {
-        return new Delegator();
-    }
-    
-    public static Delegator createInstance(String calendarUserAddress) {
-        return initialiseInstance().setCalendarUserAddress(calendarUserAddress);
-    }
+        private Builder() {
+            value = new ArrayList<>();
+        }
+
+        public Builder addDelegator(CalendarUserAddress delegator) {
+            value.add(delegator);
+            return this;
+        }
+
+        public Builder addDelegator(String delegator) {
+            value.add(new CalendarUserAddress(delegator));
+            return this;
+        }
+
+        public Builder addDelegator(URI delegator) {
+            value.add(new CalendarUserAddress(delegator));
+            return this;
+        }
+
+        public Builder addDelegators(List<CalendarUserAddress> delegators) {
+            value.addAll(delegators);
+            return this;
+        }
+
+        public Builder addDelegators(Supplier<List<CalendarUserAddress>> delegators) {
+            value.addAll(delegators.get());
+            return this;
+        }
 
-    public static Delegator createInstance(URI calendarUserAddress) {
-        return initialiseInstance().setCalendarUserAddress(calendarUserAddress);
+        public Delegator build() {
+            return new Delegator(value);
+        }
     }
 
     @Override
     public String resolve() {
-        return PROPERTY_NAME + "=\"" + calendarUserAddress + "\"";
+        return PROPERTY_NAME + "=\"" + String.join(",", value
+                .stream()
+                .map((_value) -> "\"" + _value + "\"")
+                .toList()) + "\"";
     }
 }