Refactor variable declarations to use 'val' for immutability in completion provider and parameter extension

Author: xterao

src/main/kotlin/org/domaframework/doma/intellij/contributor/sql/provider/SqlParameterCompletionProvider.kt

@@ -149,7 +149,7 @@ class SqlParameterCompletionProvider : CompletionProvider<CompletionParameters>(
 
         // If the parent has field access, get its child element
         // Completion for the first argument in SqlElParameters.
-        var parameterParent: PsiElement? =
+        val parameterParent: PsiElement? =
             PsiTreeUtil.getParentOfType(targetElement, SqlElParameters::class.java)
         val processor = SqlCompletionParameterArgsBlockProcessor(targetElement)
         if (parameterParent != null && parameterParent.children.size <= 1) {
@@ -420,7 +420,7 @@ class SqlParameterCompletionProvider : CompletionProvider<CompletionParameters>(
         caretNextText: String,
         result: CompletionResultSet,
     ) {
-        var psiParentClass = PsiParentClass(topElementType)
+        val psiParentClass = PsiParentClass(topElementType)
 
         // FieldAccess Completion
         ForDirectiveUtil.getFieldAccessLastPropertyClassType(

src/main/kotlin/org/domaframework/doma/intellij/extension/psi/PsiParameterExtension.kt

@@ -20,7 +20,7 @@ import com.intellij.psi.PsiParameter
 import org.domaframework.doma.intellij.common.util.DomaClassName
 
 private val ignoreUsageCheckType =
-    listOf<DomaClassName>(
+    listOf(
         DomaClassName.JAVA_FUNCTION,
         DomaClassName.BI_FUNCTION,
         DomaClassName.SELECT_OPTIONS,

src/main/kotlin/org/domaframework/doma/intellij/reference/SqlPsiReferenceProvider.kt

@@ -79,10 +79,10 @@ class SqlPsiReferenceProvider : PsiReferenceProvider() {
 
             is SqlElIdExpr -> {
                 when {
-                    element.parent is SqlElFieldAccessExpr
-                            || element.parent is SqlElParameters -> arrayOf(SqlElIdExprReference(element))
+                    element.parent is SqlElFieldAccessExpr ||
+                        element.parent is SqlElParameters -> arrayOf(SqlElIdExprReference(element))
 
-                    getParentClassPsiType(element, SqlElFunctionCallExpr::class.java) != null  ->
+                    getParentClassPsiType(element, SqlElFunctionCallExpr::class.java) != null ->
                         arrayOf(SqlElFunctionCallExprReference(element))
 
                     getParentClassPsiType(element, SqlElClass::class.java) != null ->