eneveu · December 11, 2015 12:58 · Jan 23, 2013 · Jan 23, 2013
diff --git a/TreeBuilderDemo.java b/TreeBuilderDemo.java
@@ -17,7 +17,5 @@ public void demo() {
                 .____________("h")
                 .____("i")
                 .build();
-
-
     }
 }
diff --git a/TreeBuilder.java b/TreeBuilder.java
@@ -0,0 +1,58 @@
+package rubber.duck;
+
+import com.google.common.collect.ImmutableMultimap;
+import com.google.common.collect.Lists;
+import org.apache.commons.lang.NotImplementedException;
+
+import java.util.List;
+
+// TODO: generate the tree from the list of temporary element holders
+// fail fast if an user calls methods in the wrong order
+public class TreeBuilder<T> {
+
+    private final List<TemporaryElementHolder<T>> temporaryElementHolders = Lists.newArrayList();
+
+
+    public TreeBuilder<T> ____(T element) {
+        return addElementAtLevel(element, 1);
+    }
+
+    public TreeBuilder<T> ________(T element) {
+        return addElementAtLevel(element, 2);
+    }
+
+    public TreeBuilder<T> ____________(T element) {
+        return addElementAtLevel(element, 3);
+    }
+
+    public TreeBuilder<T> ________________(T element) {
+        return addElementAtLevel(element, 4);
+    }
+
+    public TreeBuilder<T> ____________________(T element) {
+        return addElementAtLevel(element, 5);
+    }
+
+    /**
+     * Use this method when your tree is too deep to use the "____" methods.
+     */
+    public TreeBuilder<T> addElementAtLevel(T element, int level) {
+        temporaryElementHolders.add(new TemporaryElementHolder<T>(element, level));
+        return this;
+    }
+
+    public ImmutableMultimap<T, T> build() {
+        throw new NotImplementedException("TODO");
+    }
+
+    private static class TemporaryElementHolder<T> {
+        final T element;
+        final int level;
+
+        private TemporaryElementHolder(T element, int level) {
+            this.element = element;
+            this.level = level;
+        }
+    }
+
+}
diff --git a/TreeBuilderDemo.java b/TreeBuilderDemo.java
@@ -0,0 +1,23 @@
+package rubber.duck;
+
+import com.google.common.collect.ImmutableMultimap;
+
+public class TreeBuilderDemo {
+
+    public void demo() {
+
+        ImmutableMultimap<String, String> tree = new TreeBuilder<String>()
+                .____("a")
+                .________("b")
+                .____________("c")
+                .____________("d")
+                .________________("e")
+                .____________("f")
+                .________("g")
+                .____________("h")
+                .____("i")
+                .build();
+
+
+    }
+}