remove redundant casts when extract changed parameter type accordingly (IDEA-79743)

java/openapi/src/com/intellij/psi/util/RedundantCastUtil.java

@@ -27,7 +27,10 @@ import com.intellij.util.IncorrectOperationException;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
 /**
  * @author max
@@ -65,6 +68,31 @@ public class RedundantCastUtil {
     return arg;
   }
 
+  public static void removeCast(PsiTypeCastExpression castExpression) {
+    if (castExpression == null) return;
+    PsiExpression operand = castExpression.getOperand();
+    if (operand instanceof PsiParenthesizedExpression) {
+      final PsiParenthesizedExpression parExpr = (PsiParenthesizedExpression)operand;
+      operand = parExpr.getExpression();
+    }
+    if (operand == null) return;
+
+    PsiElement toBeReplaced = castExpression;
+
+    PsiElement parent = castExpression.getParent();
+    while (parent instanceof PsiParenthesizedExpression) {
+      toBeReplaced = parent;
+      parent = parent.getParent();
+    }
+
+    try {
+      toBeReplaced.replace(operand);
+    }
+    catch (IncorrectOperationException e) {
+      LOG.error(e);
+    }
+  }
+
   private static class MyCollectingVisitor extends MyIsRedundantVisitor {
     private final Set<PsiTypeCastExpression> myFoundCasts = new HashSet<PsiTypeCastExpression>();