2 files changed, 28 insertions, 0 deletions
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/AttributesUtil.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/AttributesUtil.java
new file mode 100644
index 0000000..cd2ae91
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/AttributesUtil.java
@@ -0,0 +1,21 @@
+package pl.edu.mimuw.cloudatlas.model;
+
+import java.util.Iterator;
+import java.util.Map.Entry;
+
+public class AttributesUtil {
+    public static void transferAttributes(AttributesMap fromAttributes, AttributesMap toAttributes) {
+        Iterator<Entry<Attribute, Value>> iterator = toAttributes.iterator();
+        while (iterator.hasNext()) {
+            Entry<Attribute, Value> entry = iterator.next();
+            Attribute attribute = entry.getKey();
+            Value newValue = fromAttributes.getOrNull(attribute);
+            if (newValue == null) {
+                iterator.remove();
+            }
+        }
+        for (Entry<Attribute, Value> entry : fromAttributes) {
+            toAttributes.addOrChange(entry.getKey(), entry.getValue());
+        }
+    }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
new file mode 100644
index 0000000..01a45b5
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
@@ -0,0 +1,7 @@
+package pl.edu.mimuw.cloudatlas.model;
+
+public class ValueUtils {
+    public static boolean valueNonNullOfType(Value value, Type type) {
+        return value != null && !value.isNull() && value.getType().isCompatible(type);
+    }
+}