1 files changed, 53 insertions, 0 deletions
diff --git a/src/com/vaadin/data/util/Reference.java b/src/com/vaadin/data/util/Reference.java
new file mode 100644
index 0000000000..9e174b4f0f
--- /dev/null
+++ b/src/com/vaadin/data/util/Reference.java
@@ -0,0 +1,53 @@
+package com.vaadin.data.util;
+
+import java.io.Serializable;
+
+/**
+ * The reference class represents a simple [usually foreign key] reference to
+ * another SQLContainer. Actual foreign key reference in the database is not
+ * required, but it is recommended to make sure that certain constraints are
+ * followed.
+ */
+@SuppressWarnings("serial")
+class Reference implements Serializable {
+
+    /**
+     * The SQLContainer that this reference points to.
+     */
+    private SQLContainer referencedContainer;
+
+    /**
+     * The column ID/name in the referencing SQLContainer that contains the key
+     * used for the reference.
+     */
+    private String referencingColumn;
+
+    /**
+     * The column ID/name in the referenced SQLContainer that contains the key
+     * used for the reference.
+     */
+    private String referencedColumn;
+
+    /**
+     * Constructs a new reference to be used within the SQLContainer to
+     * reference another SQLContainer.
+     */
+    Reference(SQLContainer referencedContainer, String referencingColumn,
+            String referencedColumn) {
+        this.referencedContainer = referencedContainer;
+        this.referencingColumn = referencingColumn;
+        this.referencedColumn = referencedColumn;
+    }
+
+    SQLContainer getReferencedContainer() {
+        return referencedContainer;
+    }
+
+    String getReferencingColumn() {
+        return referencingColumn;
+    }
+
+    String getReferencedColumn() {
+        return referencedColumn;
+    }
+}