private @Nullable PsiElement replace(@NotNull PsiField field) {
      Project project = field.getProject();
      PsiClass containingClass = field.getContainingClass();
      if (containingClass == null) return null;
      String name = field.getName();
      PsiExpression disjunction = tryCast(myFirstComparison.getParent(), PsiPolyadicExpression.class);
      if (disjunction == null) return null;
      int startOffset = myFirstComparison.getStartOffsetInParent();
      int endOffset = myLastComparison.getStartOffsetInParent() + myLastComparison.getTextLength();
      String origText = disjunction.getText();
      String fieldReference = PsiResolveHelper.getInstance(project).resolveReferencedVariable(name, disjunction) == field ?
                              name : containingClass.getQualifiedName() + "." + name;
      String replacementText = origText.substring(0, startOffset) +
                               fieldReference + ".contains(" + myExpression.getText() + ")" +
                               origText.substring(endOffset);
      PsiExpression replacement = JavaPsiFacade.getElementFactory(project).createExpressionFromText(replacementText, disjunction);
      if (replacement instanceof PsiMethodCallExpression && disjunction.getParent() instanceof PsiParenthesizedExpression) {
        disjunction = (PsiExpression)disjunction.getParent();
      }
      return disjunction.replace(replacement);
    }
private @Nullable PsiElement replace(@NotNull PsiField field)