blob: 0119c5626bf7fa08133bcccfeab45f1ed836a910 (
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
|
/*
* Copyright 2000-2012 JetBrains s.r.o.
*
* 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.intellij.openapi.util;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* @author ven
*/
public class Ref<T> {
private T myValue;
public Ref() { }
public Ref(@Nullable T value) {
myValue = value;
}
public boolean isNull() {
return myValue == null;
}
public T get() {
return myValue;
}
public void set(@Nullable T value) {
myValue = value;
}
public boolean setIfNull(@Nullable T value) {
if (myValue == null) {
myValue = value;
return true;
}
return false;
}
@NotNull
public static <T> Ref<T> create() {
return new Ref<T>();
}
public static <T> Ref<T> create(@Nullable T value) {
return new Ref<T>(value);
}
@Override
public String toString() {
return String.valueOf(myValue);
}
}
|
