Usages Search: Introduce extension for usages of methods overriding Kotlin functions/properties

idea/src/META-INF/plugin.xml

@@ -455,6 +455,7 @@
     <annotatedElementsSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinAnnotatedElementsSearcher"/>
     <methodReferencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinLightPropertyAccessorsReferenceSearcher"/>
     <methodReferencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinConstructorDelegationCallReferenceSearcher"/>
+    <methodReferencesSearch implementation="org.jetbrains.kotlin.idea.search.ideaExtensions.KotlinOverridingMethodReferenceSearcher"/>
 
     <exceptionFilter implementation="org.jetbrains.kotlin.idea.filters.JetExceptionFilterFactory" order="first"/>
 

idea/src/org/jetbrains/kotlin/idea/search/ideaExtensions/KotlinOverridingMethodReferenceSearcher.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2015 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 org.jetbrains.kotlin.idea.search.ideaExtensions
+
+import com.intellij.openapi.application.QueryExecutorBase
+import com.intellij.psi.PsiClass
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiMethod
+import com.intellij.psi.PsiReference
+import com.intellij.psi.impl.search.MethodTextOccurrenceProcessor
+import com.intellij.psi.impl.search.MethodUsagesSearcher
+import com.intellij.psi.search.searches.MethodReferencesSearch
+import com.intellij.util.Processor
+import org.jetbrains.kotlin.asJava.KotlinLightMethod
+import org.jetbrains.kotlin.asJava.getRepresentativeLightMethod
+import org.jetbrains.kotlin.asJava.toLightMethods
+import org.jetbrains.kotlin.psi.JetCallableDeclaration
+import org.jetbrains.kotlin.psi.JetDeclaration
+import org.jetbrains.kotlin.psi.JetFunction
+import org.jetbrains.kotlin.psi.JetNamedDeclaration
+
+public class KotlinOverridingMethodReferenceSearcher : MethodUsagesSearcher() {
+    override fun getTextOccurrenceProcessor(methods: Array<out PsiMethod>,
+                                            aClass: PsiClass,
+                                            strictSignatureSearch: Boolean): MethodTextOccurrenceProcessor? {
+        return object: MethodTextOccurrenceProcessor(aClass, strictSignatureSearch, *methods) {
+            override fun processInexactReference(ref: PsiReference, refElement: PsiElement?, method: PsiMethod, consumer: Processor<PsiReference>): Boolean {
+                if (refElement !is JetCallableDeclaration) return true
+                return refElement.getRepresentativeLightMethod()?.let { super.processInexactReference(ref, it, method, consumer) } ?: true
+            }
+        }
+    }
+}