Fix configuration for AS 3.5

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/GradleScriptInputsWatcher.kt.as35

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.scripting.gradle
+
+import com.intellij.openapi.externalSystem.service.project.autoimport.ConfigurationFileCrcFactory
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VfsUtil
+import com.intellij.openapi.vfs.VirtualFile
+import org.jetbrains.plugins.gradle.settings.GradleLocalSettings
+import java.nio.file.Paths
+import java.util.*
+
+class GradleScriptInputsWatcher(val project: Project) {
+    private val comparator = Comparator<VirtualFile> { f1, f2 -> (f1.timeStamp - f2.timeStamp).toInt() }
+
+    private val storage = TreeSet(comparator)
+
+    init {
+        initStorage(project)
+    }
+
+    private fun initStorage(project: Project) {
+        val localSettings = GradleLocalSettings.getInstance(project)
+        localSettings.externalConfigModificationStamps.forEach { (path, stamp) ->
+            val file = VfsUtil.findFile(Paths.get(path), true)
+            if (file != null && !file.isDirectory) {
+                val calculateCrc = ConfigurationFileCrcFactory(project, file).create()
+                if (calculateCrc != stamp) {
+                    addToStorage(file)
+                }
+            }
+        }
+    }
+
+    fun lastModifiedFileTimeStamp(file: VirtualFile): Long = lastModifiedRelatedFile(file)?.timeStamp ?: 0
+
+    fun areRelatedFilesUpToDate(file: VirtualFile, timeStamp: Long): Boolean {
+        return lastModifiedFileTimeStamp(file) <= timeStamp
+    }
+
+    fun addToStorage(file: VirtualFile) {
+        if (storage.contains(file)) {
+            storage.remove(file)
+        }
+        storage.add(file)
+    }
+
+    private fun lastModifiedRelatedFile(file: VirtualFile): VirtualFile? {
+        if (storage.isEmpty()) return null
+
+        val iterator = storage.descendingIterator()
+        if (!iterator.hasNext()) return null
+
+        var lastModifiedFile = iterator.next()
+        while (lastModifiedFile == file && iterator.hasNext()) {
+            lastModifiedFile = iterator.next()
+        }
+
+        if (lastModifiedFile == file) return null
+
+        return lastModifiedFile
+    }
+}