1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/FieldAccessNode.java b/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/FieldAccessNode.java
new file mode 100644
index 0000000000..db5bf51c5b
--- /dev/null
+++ b/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/FieldAccessNode.java
@@ -0,0 +1,113 @@
+package org.checkerframework.dataflow.cfg.node;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import javax.lang.model.element.VariableElement;
+
+import org.checkerframework.dataflow.util.HashCodeUtils;
+
+import org.checkerframework.javacutil.ElementUtils;
+import org.checkerframework.javacutil.InternalUtils;
+import org.checkerframework.javacutil.TreeUtils;
+
+import com.sun.source.tree.IdentifierTree;
+import com.sun.source.tree.MemberSelectTree;
+import com.sun.source.tree.Tree;
+
+/**
+ * A node for a field access, including a method accesses:
+ *
+ * <pre>
+ *   <em>expression</em> . <em>field</em>
+ * </pre>
+ *
+ * @author Stefan Heule
+ *
+ */
+public class FieldAccessNode extends Node {
+
+    protected Tree tree;
+    protected VariableElement element;
+    protected String field;
+    protected Node receiver;
+
+    // TODO: add method to get modifiers (static, access level, ..)
+
+    public FieldAccessNode(Tree tree, Node receiver) {
+        super(InternalUtils.typeOf(tree));
+        assert TreeUtils.isFieldAccess(tree);
+        this.tree = tree;
+        this.receiver = receiver;
+        this.field = TreeUtils.getFieldName(tree);
+
+        if (tree instanceof MemberSelectTree) {
+            this.element = (VariableElement) TreeUtils.elementFromUse((MemberSelectTree) tree);
+        } else {
+            assert tree instanceof IdentifierTree;
+            this.element =  (VariableElement) TreeUtils.elementFromUse((IdentifierTree) tree);
+        }
+    }
+
+    public FieldAccessNode(Tree tree, VariableElement element, Node receiver) {
+        super(element.asType());
+        this.tree = tree;
+        this.element = element;
+        this.receiver = receiver;
+        this.field = element.getSimpleName().toString();
+    }
+
+    public VariableElement getElement() {
+        return element;
+    }
+
+    public Node getReceiver() {
+        return receiver;
+    }
+
+    public String getFieldName() {
+        return field;
+    }
+
+    @Override
+    public Tree getTree() {
+        return tree;
+    }
+
+    @Override
+    public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
+        return visitor.visitFieldAccess(this, p);
+    }
+
+    @Override
+    public String toString() {
+        return getReceiver() + "." + field;
+    }
+
+    /**
+     * Is this a static field?
+     */
+    public boolean isStatic() {
+        return ElementUtils.isStatic(getElement());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null || !(obj instanceof FieldAccessNode)) {
+            return false;
+        }
+        FieldAccessNode other = (FieldAccessNode) obj;
+        return getReceiver().equals(other.getReceiver())
+                && getFieldName().equals(other.getFieldName());
+    }
+
+    @Override
+    public int hashCode() {
+        return HashCodeUtils.hash(getReceiver(), getFieldName());
+    }
+
+    @Override
+    public Collection<Node> getOperands() {
+        return Collections.singletonList(receiver);
+    }
+}