Refactoring: introduce resolve to property descriptor

idea/ide-common/src/org/jetbrains/kotlin/idea/caches/resolve/resolutionApi.kt

@@ -75,6 +75,10 @@ fun KtNamedFunction.resolveToDescriptorIfAny(bodyResolveMode: BodyResolveMode =
     return (this as KtDeclaration).resolveToDescriptorIfAny(bodyResolveMode) as? FunctionDescriptor
 }
 
+fun KtProperty.resolveToDescriptorIfAny(bodyResolveMode: BodyResolveMode = BodyResolveMode.PARTIAL): VariableDescriptor? {
+    return (this as KtDeclaration).resolveToDescriptorIfAny(bodyResolveMode) as? VariableDescriptor
+}
+
 fun KtParameter.resolveToParameterDescriptorIfAny(bodyResolveMode: BodyResolveMode = BodyResolveMode.PARTIAL): ValueParameterDescriptor? {
     val context = analyze(bodyResolveMode)
     return context.get(BindingContext.VALUE_PARAMETER, this) as? ValueParameterDescriptor

idea/idea-core/src/org/jetbrains/kotlin/idea/core/psiModificationUtils.kt

@@ -27,7 +27,6 @@ import org.jetbrains.kotlin.extensions.DeclarationAttributeAltererExtension
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.references.mainReference
-import org.jetbrains.kotlin.idea.search.usagesSearch.descriptor
 import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
 import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
 import org.jetbrains.kotlin.lexer.KtTokens
@@ -255,7 +254,7 @@ fun KtModifierListOwner.setVisibility(visibilityModifier: KtModifierKeywordToken
 fun KtDeclaration.implicitVisibility(): KtModifierKeywordToken? {
     return when {
         this is KtPropertyAccessor && isSetter && property.hasModifier(KtTokens.OVERRIDE_KEYWORD) -> {
-            (property.descriptor as? PropertyDescriptor)?.overriddenDescriptors?.forEach {
+            (property.resolveToDescriptorIfAny() as? PropertyDescriptor)?.overriddenDescriptors?.forEach {
                 val visibility = it.setter?.visibility?.toKeywordToken()
                 if (visibility != null) return visibility
             }

idea/src/org/jetbrains/kotlin/idea/codeInsight/surroundWith/MoveDeclarationsOutHelper.java

@@ -25,7 +25,6 @@ import com.intellij.psi.search.searches.ReferencesSearch;
 import com.intellij.psi.util.PsiUtilCore;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
 import org.jetbrains.kotlin.descriptors.VariableDescriptor;
 import org.jetbrains.kotlin.idea.caches.resolve.ResolutionUtils;
 import org.jetbrains.kotlin.idea.codeInsight.CodeInsightUtils;
@@ -117,9 +116,9 @@ public class MoveDeclarationsOutHelper {
 
     @NotNull
     private static KotlinType getPropertyType(@NotNull KtProperty property) {
-        DeclarationDescriptor variableDescriptor = ResolutionUtils.resolveToDescriptorIfAny(property, BodyResolveMode.PARTIAL);
+        VariableDescriptor variableDescriptor = ResolutionUtils.resolveToDescriptorIfAny(property, BodyResolveMode.PARTIAL);
-        assert variableDescriptor instanceof VariableDescriptor : "Couldn't resolve property to property descriptor " + property.getText();
+        assert variableDescriptor != null : "Couldn't resolve property to property descriptor " + property.getText();
-        return ((VariableDescriptor) variableDescriptor).getType();
+        return variableDescriptor.getType();
     }
 
     @NotNull

idea/src/org/jetbrains/kotlin/idea/inspections/RedundantExplicitTypeInspection.kt

@@ -10,7 +10,6 @@ import com.intellij.codeInspection.ProblemHighlightType
 import com.intellij.codeInspection.ProblemsHolder
 import org.jetbrains.kotlin.KtNodeTypes
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.intentions.RemoveExplicitTypeIntention
 import org.jetbrains.kotlin.psi.*
@@ -22,7 +21,7 @@ class RedundantExplicitTypeInspection : AbstractKotlinInspection() {
                 val typeReference = property.typeReference ?: return
                 val initializer = property.initializer ?: return
 
-                val type = (property.resolveToDescriptorIfAny() as? VariableDescriptor)?.type ?: return
+                val type = property.resolveToDescriptorIfAny()?.type ?: return
                 when (initializer) {
                     is KtConstantExpression -> {
                         when (initializer.node.elementType) {

idea/src/org/jetbrains/kotlin/idea/intentions/loopToCallChain/result/CountTransformation.kt

@@ -17,7 +17,6 @@
 package org.jetbrains.kotlin.idea.intentions.loopToCallChain.result
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.intentions.loopToCallChain.*
 import org.jetbrains.kotlin.idea.intentions.loopToCallChain.sequence.FilterTransformationBase
@@ -83,7 +82,7 @@ class CountTransformation(
 
             if (initialization.variable.countUsages(state.outerLoop) != 1) return null // this should be the only usage of this variable inside the loop
 
-            val variableType = (initialization.variable.resolveToDescriptorIfAny() as? VariableDescriptor)?.type ?: return null
+            val variableType = initialization.variable.resolveToDescriptorIfAny()?.type ?: return null
             if (!KotlinBuiltIns.isInt(variableType)) return null
 
             val transformation = CountTransformation(state.outerLoop, state.inputVariable, initialization, null)

idea/src/org/jetbrains/kotlin/idea/intentions/loopToCallChain/result/SumTransformation.kt

@@ -17,7 +17,6 @@
 package org.jetbrains.kotlin.idea.intentions.loopToCallChain.result
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
-import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.intentions.loopToCallChain.*
@@ -71,7 +70,7 @@ abstract class SumTransformationBase(
             val value = statement.right ?: return null
 
             val valueType = value.typeWithSmartCast()?.toSupportedType() ?: return null
-            val sumType = (variableInitialization.variable.resolveToDescriptorIfAny() as? VariableDescriptor)?.type?.toSupportedType() ?: return null
+            val sumType = variableInitialization.variable.resolveToDescriptorIfAny()?.type?.toSupportedType() ?: return null
 
             val conversionFunctionName = when (sumType) {
                 SupportedType.INT -> {

idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeAccessorTypeFix.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.idea.quickfix
 
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
-import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.core.ShortenReferences
@@ -33,7 +32,7 @@ import org.jetbrains.kotlin.types.isError
 
 class ChangeAccessorTypeFix(element: KtPropertyAccessor) : KotlinQuickFixAction<KtPropertyAccessor>(element) {
     private fun getType(): KotlinType? =
-            (element!!.property.resolveToDescriptorIfAny() as? VariableDescriptor)?.type?.takeUnless(KotlinType::isError)
+            element!!.property.resolveToDescriptorIfAny()?.type?.takeUnless(KotlinType::isError)
 
     override fun isAvailable(project: Project, editor: Editor?, file: KtFile) = getType() != null