private NamesByExprInfo suggestVariableNameByExpressionOnly( PsiExpression expr, final VariableKind variableKind, boolean correctKeywords, boolean useAllMethodNames) { if (expr instanceof PsiMethodCallExpression) { PsiReferenceExpression methodExpr = ((PsiMethodCallExpression) expr).getMethodExpression(); String methodName = methodExpr.getReferenceName(); if (methodName != null) { if ("of".equals(methodName) || "ofNullable".equals(methodName)) { if (isJavaUtilMethodCall((PsiMethodCallExpression) expr)) { PsiExpression[] expressions = ((PsiMethodCallExpression) expr).getArgumentList().getExpressions(); if (expressions.length > 0) { return suggestVariableNameByExpressionOnly( expressions[0], variableKind, correctKeywords, useAllMethodNames); } } } if ("map".equals(methodName) || "flatMap".equals(methodName) || "filter".equals(methodName)) { if (isJavaUtilMethodCall((PsiMethodCallExpression) expr)) { return new NamesByExprInfo(null); } } String[] words = NameUtil.nameToWords(methodName); if (words.length > 0) { final String firstWord = words[0]; if (GET_PREFIX.equals(firstWord) || IS_PREFIX.equals(firstWord) || FIND_PREFIX.equals(firstWord) || CREATE_PREFIX.equals(firstWord)) { if (words.length > 1) { final String propertyName = methodName.substring(firstWord.length()); String[] names = getSuggestionsByName(propertyName, variableKind, false, correctKeywords); final PsiExpression qualifierExpression = methodExpr.getQualifierExpression(); if (qualifierExpression instanceof PsiReferenceExpression && ((PsiReferenceExpression) qualifierExpression).resolve() instanceof PsiVariable) { names = ArrayUtil.append( names, StringUtil.sanitizeJavaIdentifier( changeIfNotIdentifier( qualifierExpression.getText() + StringUtil.capitalize(propertyName)))); } return new NamesByExprInfo(propertyName, names); } } else if (words.length == 1 || useAllMethodNames) { return new NamesByExprInfo( methodName, getSuggestionsByName(methodName, variableKind, false, correctKeywords)); } } } } else if (expr instanceof PsiReferenceExpression) { String propertyName = ((PsiReferenceExpression) expr).getReferenceName(); PsiElement refElement = ((PsiReferenceExpression) expr).resolve(); if (refElement instanceof PsiVariable) { VariableKind refVariableKind = getVariableKind((PsiVariable) refElement); propertyName = variableNameToPropertyName(propertyName, refVariableKind); } if (refElement != null && propertyName != null) { String[] names = getSuggestionsByName(propertyName, variableKind, false, correctKeywords); return new NamesByExprInfo(propertyName, names); } } else if (expr instanceof PsiArrayAccessExpression) { PsiExpression arrayExpr = ((PsiArrayAccessExpression) expr).getArrayExpression(); if (arrayExpr instanceof PsiReferenceExpression) { String arrayName = ((PsiReferenceExpression) arrayExpr).getReferenceName(); PsiElement refElement = ((PsiReferenceExpression) arrayExpr).resolve(); if (refElement instanceof PsiVariable) { VariableKind refVariableKind = getVariableKind((PsiVariable) refElement); arrayName = variableNameToPropertyName(arrayName, refVariableKind); } if (arrayName != null) { String name = StringUtil.unpluralize(arrayName); if (name != null) { String[] names = getSuggestionsByName(name, variableKind, false, correctKeywords); return new NamesByExprInfo(name, names); } } } } else if (expr instanceof PsiLiteralExpression && variableKind == VariableKind.STATIC_FINAL_FIELD) { final PsiLiteralExpression literalExpression = (PsiLiteralExpression) expr; final Object value = literalExpression.getValue(); if (value instanceof String) { final String stringValue = (String) value; String[] names = getSuggestionsByValue(stringValue); if (names.length > 0) { return new NamesByExprInfo(null, constantValueToConstantName(names)); } } } else if (expr instanceof PsiParenthesizedExpression) { return suggestVariableNameByExpressionOnly( ((PsiParenthesizedExpression) expr).getExpression(), variableKind, correctKeywords, useAllMethodNames); } else if (expr instanceof PsiTypeCastExpression) { return suggestVariableNameByExpressionOnly( ((PsiTypeCastExpression) expr).getOperand(), variableKind, correctKeywords, useAllMethodNames); } else if (expr instanceof PsiLiteralExpression) { final String text = StringUtil.stripQuotesAroundValue(expr.getText()); if (isIdentifier(text)) { return new NamesByExprInfo( text, getSuggestionsByName(text, variableKind, false, correctKeywords)); } } return new NamesByExprInfo(null, ArrayUtil.EMPTY_STRING_ARRAY); }