Add dicore3-core, without really irrelevant packages

1 files changed, 55 insertions, 0 deletions

diff --git a/dicore3/core/src/main/java/io/dico/dicore/event/ChainedListenerHandle.java b/dicore3/core/src/main/java/io/dico/dicore/event/ChainedListenerHandle.java
new file mode 100644
index 0000000..86b8448
--- /dev/null
+++ b/dicore3/core/src/main/java/io/dico/dicore/event/ChainedListenerHandle.java
@@ -0,0 +1,55 @@
+package io.dico.dicore.event;
+
+import io.dico.dicore.InterfaceChain;
+
+public interface ChainedListenerHandle extends InterfaceChain<ListenerHandle, ChainedListenerHandle>, ListenerHandle {
+    
+    @Override
+    default ChainedListenerHandle getEmptyInstance() {
+        return ChainedListenerHandles.empty();
+    }
+    
+    @Override
+    default ChainedListenerHandle withElement(ListenerHandle element) {
+        if (element == null) {
+            return this;
+        }
+        
+        int count = getElementCount() + 1;
+        return new ChainedListenerHandle() {
+            @Override
+            public void register() {
+                try {
+                    ChainedListenerHandle.this.register();
+                } finally {
+                    element.register();
+                }
+            }
+            
+            @Override
+            public void unregister() {
+                try {
+                    ChainedListenerHandle.this.unregister();
+                } finally {
+                    element.unregister();
+                }
+            }
+            
+            @Override
+            public ChainedListenerHandle withoutLastNode() {
+                return ChainedListenerHandle.this;
+            }
+            
+            @Override
+            public ListenerHandle getDelegateOfLastNode() {
+                return element;
+            }
+            
+            @Override
+            public int getElementCount() {
+                return count;
+            }
+        };
+    }
+    
+}