001/*
002 * Copyright (C) 2012 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
005 * in compliance with the License. You may obtain a copy of the License at
006 *
007 * http://www.apache.org/licenses/LICENSE-2.0
008 *
009 * Unless required by applicable law or agreed to in writing, software distributed under the License
010 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
011 * or implied. See the License for the specific language governing permissions and limitations under
012 * the License.
013 */
014
015package com.google.common.base;
016
017import com.google.common.annotations.GwtIncompatible;
018import javax.annotation.Nullable;
019
020/**
021 * Represents a {@linkplain System#getProperties() standard system property}.
022 *
023 * @author Kurt Alfred Kluever
024 * @since 15.0
025 */
026@GwtIncompatible // java.lang.System#getProperty
027public enum StandardSystemProperty {
028
029  /** Java Runtime Environment version. */
030  JAVA_VERSION("java.version"),
031
032  /** Java Runtime Environment vendor. */
033  JAVA_VENDOR("java.vendor"),
034
035  /** Java vendor URL. */
036  JAVA_VENDOR_URL("java.vendor.url"),
037
038  /** Java installation directory. */
039  JAVA_HOME("java.home"),
040
041  /** Java Virtual Machine specification version. */
042  JAVA_VM_SPECIFICATION_VERSION("java.vm.specification.version"),
043
044  /** Java Virtual Machine specification vendor. */
045  JAVA_VM_SPECIFICATION_VENDOR("java.vm.specification.vendor"),
046
047  /** Java Virtual Machine specification name. */
048  JAVA_VM_SPECIFICATION_NAME("java.vm.specification.name"),
049
050  /** Java Virtual Machine implementation version. */
051  JAVA_VM_VERSION("java.vm.version"),
052
053  /** Java Virtual Machine implementation vendor. */
054  JAVA_VM_VENDOR("java.vm.vendor"),
055
056  /** Java Virtual Machine implementation name. */
057  JAVA_VM_NAME("java.vm.name"),
058
059  /** Java Runtime Environment specification version. */
060  JAVA_SPECIFICATION_VERSION("java.specification.version"),
061
062  /** Java Runtime Environment specification vendor. */
063  JAVA_SPECIFICATION_VENDOR("java.specification.vendor"),
064
065  /** Java Runtime Environment specification name. */
066  JAVA_SPECIFICATION_NAME("java.specification.name"),
067
068  /** Java class format version number. */
069  JAVA_CLASS_VERSION("java.class.version"),
070
071  /** Java class path. */
072  JAVA_CLASS_PATH("java.class.path"),
073
074  /** List of paths to search when loading libraries. */
075  JAVA_LIBRARY_PATH("java.library.path"),
076
077  /** Default temp file path. */
078  JAVA_IO_TMPDIR("java.io.tmpdir"),
079
080  /** Name of JIT compiler to use. */
081  JAVA_COMPILER("java.compiler"),
082
083  /** Path of extension directory or directories. */
084  JAVA_EXT_DIRS("java.ext.dirs"),
085
086  /** Operating system name. */
087  OS_NAME("os.name"),
088
089  /** Operating system architecture. */
090  OS_ARCH("os.arch"),
091
092  /** Operating system version. */
093  OS_VERSION("os.version"),
094
095  /** File separator ("/" on UNIX). */
096  FILE_SEPARATOR("file.separator"),
097
098  /** Path separator (":" on UNIX). */
099  PATH_SEPARATOR("path.separator"),
100
101  /** Line separator ("\n" on UNIX). */
102  LINE_SEPARATOR("line.separator"),
103
104  /** User's account name. */
105  USER_NAME("user.name"),
106
107  /** User's home directory. */
108  USER_HOME("user.home"),
109
110  /** User's current working directory. */
111  USER_DIR("user.dir");
112
113  private final String key;
114
115  private StandardSystemProperty(String key) {
116    this.key = key;
117  }
118
119  /**
120   * Returns the key used to lookup this system property.
121   */
122  public String key() {
123    return key;
124  }
125
126  /**
127   * Returns the current value for this system property by delegating to
128   * {@link System#getProperty(String)}.
129   */
130  @Nullable
131  public String value() {
132    return System.getProperty(key);
133  }
134
135  /**
136   * Returns a string representation of this system property.
137   */
138  @Override
139  public String toString() {
140    return key() + "=" + value();
141  }
142}