blob: fc60bc19b19d9eaa42d84922ddf56a1ca8eda938 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* Copyright 2003-2012 Dave Griffith, Bas Leijdekkers
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.siyeh.ig.psiutils;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;
public class UtilityClassUtil {
private UtilityClassUtil() {}
public static boolean isUtilityClass(@NotNull PsiClass aClass) {
return isUtilityClass(aClass, true);
}
public static boolean isUtilityClass(@NotNull PsiClass aClass, boolean fullCheck) {
if (aClass.isInterface() || aClass.isEnum() || aClass.isAnnotationType()) {
return false;
}
if (aClass instanceof PsiTypeParameter || aClass instanceof PsiAnonymousClass) {
return false;
}
final PsiReferenceList extendsList = aClass.getExtendsList();
if (fullCheck && extendsList != null && extendsList.getReferenceElements().length > 0) {
return false;
}
final PsiReferenceList implementsList = aClass.getImplementsList();
if (implementsList != null && implementsList.getReferenceElements().length > 0) {
return false;
}
final PsiMethod[] methods = aClass.getMethods();
final int staticMethodCount = countStaticMethods(methods);
if (staticMethodCount < 0) {
return false;
}
final PsiField[] fields = aClass.getFields();
if (!allFieldsStatic(fields)) {
return false;
}
return (!fullCheck || staticMethodCount != 0) || fields.length != 0;
}
private static boolean allFieldsStatic(PsiField[] fields) {
for (final PsiField field : fields) {
if (!field.hasModifierProperty(PsiModifier.STATIC)) {
return false;
}
}
return true;
}
/**
* @return -1 if an instance method was found, else the number of static methods in the class
*/
private static int countStaticMethods(PsiMethod[] methods) {
int staticCount = 0;
for (final PsiMethod method : methods) {
if (method.isConstructor()) {
continue;
}
if (!method.hasModifierProperty(PsiModifier.STATIC)) {
return -1;
}
if (method.hasModifierProperty(PsiModifier.PRIVATE)) {
continue;
}
staticCount++;
}
return staticCount;
}
}
|
