1 /*
2 * Copyright (C) 2012 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.google.common.base;
18
19 import com.google.common.annotations.Beta;
20 import com.google.common.annotations.GwtIncompatible;
21
22 import javax.annotation.Nullable;
23
24 /**
25 * Represents a {@linkplain System#getProperties() standard system property}.
26 *
27 * @author Kurt Alfred Kluever
28 * @since 15.0
29 */
30 @Beta
31 @GwtIncompatible("java.lang.System#getProperty")
32 public enum StandardSystemProperty {
33
34 /** Java Runtime Environment version. */
35 JAVA_VERSION("java.version"),
36
37 /** Java Runtime Environment vendor. */
38 JAVA_VENDOR("java.vendor"),
39
40 /** Java vendor URL. */
41 JAVA_VENDOR_URL("java.vendor.url"),
42
43 /** Java installation directory. */
44 JAVA_HOME("java.home"),
45
46 /** Java Virtual Machine specification version. */
47 JAVA_VM_SPECIFICATION_VERSION("java.vm.specification.version"),
48
49 /** Java Virtual Machine specification vendor. */
50 JAVA_VM_SPECIFICATION_VENDOR("java.vm.specification.vendor"),
51
52 /** Java Virtual Machine specification name. */
53 JAVA_VM_SPECIFICATION_NAME("java.vm.specification.name"),
54
55 /** Java Virtual Machine implementation version. */
56 JAVA_VM_VERSION("java.vm.version"),
57
58 /** Java Virtual Machine implementation vendor. */
59 JAVA_VM_VENDOR("java.vm.vendor"),
60
61 /** Java Virtual Machine implementation name. */
62 JAVA_VM_NAME("java.vm.name"),
63
64 /** Java Runtime Environment specification version. */
65 JAVA_SPECIFICATION_VERSION("java.specification.version"),
66
67 /** Java Runtime Environment specification vendor. */
68 JAVA_SPECIFICATION_VENDOR("java.specification.vendor"),
69
70 /** Java Runtime Environment specification name. */
71 JAVA_SPECIFICATION_NAME("java.specification.name"),
72
73 /** Java class format version number. */
74 JAVA_CLASS_VERSION("java.class.version"),
75
76 /** Java class path. */
77 JAVA_CLASS_PATH("java.class.path"),
78
79 /** List of paths to search when loading libraries. */
80 JAVA_LIBRARY_PATH("java.library.path"),
81
82 /** Default temp file path. */
83 JAVA_IO_TMPDIR("java.io.tmpdir"),
84
85 /** Name of JIT compiler to use. */
86 JAVA_COMPILER("java.compiler"),
87
88 /** Path of extension directory or directories. */
89 JAVA_EXT_DIRS("java.ext.dirs"),
90
91 /** Operating system name. */
92 OS_NAME("os.name"),
93
94 /** Operating system architecture. */
95 OS_ARCH("os.arch"),
96
97 /** Operating system version. */
98 OS_VERSION("os.version"),
99
100 /** File separator ("/" on UNIX). */
101 FILE_SEPARATOR("file.separator"),
102
103 /** Path separator (":" on UNIX). */
104 PATH_SEPARATOR("path.separator"),
105
106 /** Line separator ("\n" on UNIX). */
107 LINE_SEPARATOR("line.separator"),
108
109 /** User's account name. */
110 USER_NAME("user.name"),
111
112 /** User's home directory. */
113 USER_HOME("user.home"),
114
115 /** User's current working directory. */
116 USER_DIR("user.dir");
117
118 private final String key;
119
120 private StandardSystemProperty(String key) {
121 this.key = key;
122 }
123
124 /**
125 * Returns the key used to lookup this system property.
126 */
127 public String key() {
128 return key;
129 }
130
131 /**
132 * Returns the current value for this system property by delegating to
133 * {@link System#getProperty(String)}.
134 */
135 @Nullable
136 public String value() {
137 return System.getProperty(key);
138 }
139
140 /**
141 * Returns a string representation of this system property.
142 */
143 @Override public String toString() {
144 return key() + "=" + value();
145 }
146 }