protected boolean preprocessUsages(Ref<UsageInfo[]> refUsages) { final UsageInfo[] usages = refUsages.get(); MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>(); final Set<PsiMember> members = new HashSet<PsiMember>(); members.add(myMethod); if (myTargetVariable instanceof PsiField) members.add((PsiMember) myTargetVariable); if (!myTargetClass.isInterface()) { RefactoringConflictsUtil.analyzeAccessibilityConflicts( members, myTargetClass, conflicts, myNewVisibility); } else { for (final UsageInfo usage : usages) { if (usage instanceof InheritorUsageInfo) { RefactoringConflictsUtil.analyzeAccessibilityConflicts( members, ((InheritorUsageInfo) usage).getInheritor(), conflicts, myNewVisibility); } } } if (myTargetVariable instanceof PsiParameter) { PsiParameter parameter = (PsiParameter) myTargetVariable; for (final UsageInfo usageInfo : usages) { if (usageInfo instanceof MethodCallUsageInfo) { final PsiElement methodCall = ((MethodCallUsageInfo) usageInfo).getMethodCallExpression(); if (methodCall instanceof PsiMethodCallExpression) { final PsiExpression[] expressions = ((PsiMethodCallExpression) methodCall).getArgumentList().getExpressions(); final int index = myMethod.getParameterList().getParameterIndex(parameter); if (index < expressions.length) { PsiExpression instanceValue = expressions[index]; instanceValue = RefactoringUtil.unparenthesizeExpression(instanceValue); if (instanceValue instanceof PsiLiteralExpression && ((PsiLiteralExpression) instanceValue).getValue() == null) { String message = RefactoringBundle.message( "0.contains.call.with.null.argument.for.parameter.1", RefactoringUIUtil.getDescription( ConflictsUtil.getContainer(methodCall), true), CommonRefactoringUtil.htmlEmphasize(parameter.getName())); conflicts.putValue(instanceValue, message); } } } else if (methodCall instanceof PsiMethodReferenceExpression) { conflicts.putValue(methodCall, "Method reference would be broken after move"); } } } } try { ConflictsUtil.checkMethodConflicts(myTargetClass, myMethod, getPatternMethod(), conflicts); } catch (IncorrectOperationException e) { } return showConflicts(conflicts, usages); }