First take on method references

java/java-psi-api/src/com/intellij/psi/PsiMethodReferenceExpression.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * 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.intellij.psi;
+
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Represents a method or constructor reference.
+ */
+public interface PsiMethodReferenceExpression extends PsiReferenceExpression {
+  /**
+   * Returns the type element used as the qualifier of the reference.
+   *
+   * @return the qualifier, or null if the reference is qualified by expression.
+   */
+  @Nullable
+  PsiTypeElement getQualifierType();
+}