1 files changed, 68 insertions, 0 deletions
diff --git a/javaparser-symbol-solver-model/src/main/java/com/github/javaparser/symbolsolver/model/typesystem/NullType.java b/javaparser-symbol-solver-model/src/main/java/com/github/javaparser/symbolsolver/model/typesystem/NullType.java
new file mode 100644
index 000000000..4fccfaad1
--- /dev/null
+++ b/javaparser-symbol-solver-model/src/main/java/com/github/javaparser/symbolsolver/model/typesystem/NullType.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2016 Federico Tomassetti
+ *
+ * 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.github.javaparser.symbolsolver.model.typesystem;
+
+import com.github.javaparser.resolution.types.ResolvedType;
+
+/**
+ * This is a virtual type used to represent null values.
+ *
+ * @author Federico Tomassetti
+ */
+public class NullType implements ResolvedType {
+
+    public static final NullType INSTANCE = new NullType();
+
+    private NullType() {
+        // prevent instantiation
+    }
+
+    @Override
+    public boolean isArray() {
+        return false;
+    }
+
+    @Override
+    public boolean isPrimitive() {
+        return false;
+    }
+
+    public boolean isNull() {
+        return true;
+    }
+
+    @Override
+    public boolean isReferenceType() {
+        return false;
+    }
+
+    @Override
+    public String describe() {
+        return "null";
+    }
+
+    @Override
+    public boolean isTypeVariable() {
+        return false;
+    }
+
+    @Override
+    public boolean isAssignableBy(ResolvedType other) {
+        throw new UnsupportedOperationException("It does not make sense to assign a value to null, it can only be assigned");
+    }
+
+}