method refs: mismatched collection query (IDEA-112981)

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/bugs/CollectionQueryCalledVisitor.java

@@ -96,6 +96,17 @@ class CollectionQueryCalledVisitor extends JavaRecursiveElementVisitor {
     checkQualifier(qualifier);
   }
 
+
+  @Override
+  public void visitMethodReferenceExpression(PsiMethodReferenceExpression expression) {
+    if (queried) return;
+    final String methodName = expression.getReferenceName();
+    if (methodName == null) {
+      return;
+    }
+    checkQualifier(expression.getQualifierExpression());
+  }
+
   private void checkQualifier(PsiExpression expression) {
     if (queried) {
       return;

plugins/InspectionGadgets/test/com/siyeh/igtest/bugs/mismatched_collection_query_update/MismatchedCollectionQueryUpdate.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2000-2013 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.siyeh.igtest.bugs.mismatched_collection_query_update;
 
 import java.util.*;
@@ -190,4 +205,10 @@ class MethReference<E> {
     interface I<E> {
         boolean _(E e);
     }
+
+    void qTest() {
+        Map<Integer, Boolean> map = new HashMap<>();
+        map.put(1, true);
+        I<Integer> mapper = map::get;
+    }
 }