1 files changed, 66 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/query/textserialize/item/CompositeConverter.java b/container-search/src/main/java/com/yahoo/search/query/textserialize/item/CompositeConverter.java
new file mode 100644
index 00000000000..7f7c5e48d0a
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/query/textserialize/item/CompositeConverter.java
@@ -0,0 +1,66 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.query.textserialize.item;
+
+import com.yahoo.prelude.query.CompositeItem;
+import com.yahoo.prelude.query.Item;
+import com.yahoo.search.query.textserialize.serializer.DispatchForm;
+import com.yahoo.search.query.textserialize.serializer.ItemIdMapper;
+
+import java.util.ListIterator;
+
+/**
+ * @author tonytv
+ */
+public class CompositeConverter<T extends CompositeItem> implements ItemFormConverter {
+    private final Class<T> itemClass;
+
+    public CompositeConverter(Class<T> itemClass) {
+        this.itemClass = itemClass;
+    }
+
+    @Override
+    public Object formToItem(String name, ItemArguments arguments, ItemContext itemContext) {
+        T item = newInstance();
+        addChildren(item, arguments, itemContext);
+        return item;
+    }
+
+    protected void addChildren(T item, ItemArguments arguments, ItemContext itemContext) {
+        for (Object child : arguments.children) {
+            item.addItem(asItem(child));
+        }
+        ItemInitializer.initialize(item, arguments, itemContext);
+    }
+
+    private static Item asItem(Object child) {
+        if (!(child instanceof Item) && child != null) {
+            throw new RuntimeException("Expected query item, but got '" + child.toString() +
+                    "' [" + child.getClass().getName() + "]");
+        }
+        return (Item) child;
+    }
+
+    private T newInstance() {
+        try {
+            return itemClass.newInstance();
+        } catch (InstantiationException | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public DispatchForm itemToForm(Item item, ItemIdMapper itemIdMapper) {
+        CompositeItem compositeItem = (CompositeItem) item;
+
+        DispatchForm form = new DispatchForm(getFormName(item));
+        for (ListIterator<Item> i = compositeItem.getItemIterator(); i.hasNext() ;) {
+            form.addChild(i.next());
+        }
+        ItemInitializer.initializeForm(form, item, itemIdMapper);
+        return form;
+    }
+
+    protected String getFormName(Item item) {
+        return item.getItemType().name();
+    }
+}