1 files changed, 78 insertions, 0 deletions
diff --git a/src/com/vaadin/data/util/sqlcontainer/RowId.java b/src/com/vaadin/data/util/sqlcontainer/RowId.java
new file mode 100644
index 0000000000..33ef273f63
--- /dev/null
+++ b/src/com/vaadin/data/util/sqlcontainer/RowId.java
@@ -0,0 +1,78 @@
+package com.vaadin.data.util.sqlcontainer;
+
+import java.io.Serializable;
+
+/**
+ * RowId represents identifiers of a single database result set row.
+ * 
+ * The data structure of a RowId is an Object array which contains the values of
+ * the primary key columns of the identified row. This allows easy equals()
+ * -comparison of RowItems.
+ */
+public class RowId implements Serializable {
+    private static final long serialVersionUID = -3161778404698901258L;
+    protected Object[] id;
+
+    /**
+     * Prevent instantiation without required parameters.
+     */
+    protected RowId() {
+    }
+
+    public RowId(Object[] id) {
+        if (id == null) {
+            throw new IllegalArgumentException("id parameter must not be null!");
+        }
+        this.id = id;
+    }
+
+    public Object[] getId() {
+        return id;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = 31;
+        if (id != null) {
+            for (Object o : id) {
+                if (o != null) {
+                    result += o.hashCode();
+                }
+            }
+        }
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null || !(obj instanceof RowId)) {
+            return false;
+        }
+        Object[] compId = ((RowId) obj).getId();
+        if (id == null && compId == null) {
+            return true;
+        }
+        if (id.length != compId.length) {
+            return false;
+        }
+        for (int i = 0; i < id.length; i++) {
+            if ((id[i] == null && compId[i] != null)
+                    || (id[i] != null && !id[i].equals(compId[i]))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer s = new StringBuffer();
+        for (int i = 0; i < id.length; i++) {
+            s.append(id[i]);
+            if (i < id.length - 1) {
+                s.append("/");
+            }
+        }
+        return s.toString();
+    }
+}