4 files changed, 28 insertions, 0 deletions
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/Type.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/Type.java
index 0994cba..4453aea 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/model/Type.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/Type.java
@@ -49,6 +49,8 @@ public abstract class Type implements Serializable {
         this.primaryType = primaryType;
     }
 
+    public Type() { this.primaryType = PrimaryType.NULL; };
+
     /**
      * Returns the primary type of this type.
      *
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/TypePrimitive.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/TypePrimitive.java
index ad07c0a..a17cafa 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/model/TypePrimitive.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/TypePrimitive.java
@@ -78,6 +78,8 @@ public class TypePrimitive extends Type {
      */
     public static final TypePrimitive QUERY = new TypePrimitive(PrimaryType.QUERY);
 
+    private TypePrimitive() {}
+
     private TypePrimitive(PrimaryType primaryType) {
         super(primaryType);
         switch(primaryType) {
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueQuery.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueQuery.java
index 26a5fbb..c5d4b54 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueQuery.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueQuery.java
@@ -49,6 +49,8 @@ public class ValueQuery extends Value {
         this.timestamp = System.currentTimeMillis();
     }
 
+    public String getCode() { return code; }
+
     public Program getQuery() {
         return query;
     }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
index 866349f..20d6600 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
@@ -1,5 +1,8 @@
 package pl.edu.mimuw.cloudatlas.model;
 
+import java.util.List;
+import java.util.Iterator;
+
 public class ValueUtils {
     public static boolean valueNonNullOfType(Value value, Type type) {
         return value != null && !value.isNull() && value.getType().isCompatible(type);
@@ -16,4 +19,23 @@ public class ValueUtils {
     public static ValueTime addToTime(ValueTime time, long millis) {
         return time.addValue(new ValueDuration(millis));
     }
+
+    public static boolean isPrefix(PathName prefix, PathName path) {
+        List<String> prefixComponents = prefix.getComponents();
+        List<String> pathComponents = path.getComponents();
+
+        if (prefixComponents.size() > pathComponents.size()) {
+            return false;
+        }
+
+        Iterator<String> prefixIterator = prefixComponents.iterator();
+        Iterator<String> pathIterator = pathComponents.iterator();
+
+        while (prefixIterator.hasNext()) {
+            if (!prefixIterator.next().equals(pathIterator.next())) {
+                return false;
+            }
+        }
+        return true;
+    }
 }