7115049: Add AST node for method references

Add tree nodes for representing method/constructor references and update relevant visitors interfaces

Reviewed-by: jjg

langtools/src/share/classes/com/sun/source/tree/MemberReferenceTree.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.source.tree;
+
+import java.util.List;
+
+import javax.lang.model.element.Name;
+
+/**
+ * A tree node for a member reference expression.
+ *
+ * For example:
+ * <pre>
+ *   <em>expression</em> # <em>[ identifier | new ]</em>
+ * </pre>
+ *
+ * @see JSR 292
+ */
+public interface MemberReferenceTree extends ExpressionTree {
+
+    /**
+     * There are two kinds of member references: (i) method references and
+     * (ii) constructor references
+     */
+    public enum ReferenceMode {
+        /** enum constant for method references */
+        INVOKE,
+        /** enum constant for constructor references */
+        NEW
+    }
+    ReferenceMode getMode();
+    ExpressionTree getQualifierExpression();
+    Name getName();
+    List<? extends ExpressionTree> getTypeArguments();
+}