1 files changed, 55 insertions, 0 deletions
diff --git a/server/src/com/vaadin/ui/declarative/ShouldWriteDataDelegate.java b/server/src/com/vaadin/ui/declarative/ShouldWriteDataDelegate.java
new file mode 100644
index 0000000000..29a78e1db6
--- /dev/null
+++ b/server/src/com/vaadin/ui/declarative/ShouldWriteDataDelegate.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * 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.vaadin.ui.declarative;
+
+import java.io.Serializable;
+
+import com.vaadin.ui.Component;
+
+/**
+ * Delegate used by {@link DesignContext} to determine whether container data
+ * should be written out for a component.
+ * 
+ * @see DesignContext#shouldWriteData(Component)
+ * 
+ * @since
+ * @author Vaadin Ltd
+ */
+public interface ShouldWriteDataDelegate extends Serializable {
+
+    /**
+     * The default delegate implementation that assumes that all component data
+     * is provided by a data source connected to a back end system and that the
+     * data should thus not be written.
+     */
+    public static final ShouldWriteDataDelegate DEFAULT = new ShouldWriteDataDelegate() {
+        @Override
+        public boolean shouldWriteData(Component component) {
+            return false;
+        }
+    };
+
+    /**
+     * Determines whether the container data of a component should be written
+     * out.
+     * 
+     * @param component
+     *            the component to check
+     * @return <code>true</code> if container data should be written out for the
+     *         provided component; otherwise <code>false</code>.
+     */
+    boolean shouldWriteData(Component component);
+}