com.google.common.base.StandardSystemProperty Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* Copyright (C) 2012 The Guava Authors
*
* 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.google.common.base;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import javax.annotation.CheckForNull;
/**
* Represents a {@linkplain System#getProperties() standard system property}.
*
* @author Kurt Alfred Kluever
* @since 15.0
*/
@J2ktIncompatible
@GwtIncompatible // java.lang.System#getProperty
@ElementTypesAreNonnullByDefault
public enum StandardSystemProperty {
/** Java Runtime Environment version. */
JAVA_VERSION("java.version"),
/** Java Runtime Environment vendor. */
JAVA_VENDOR("java.vendor"),
/** Java vendor URL. */
JAVA_VENDOR_URL("java.vendor.url"),
/** Java installation directory. */
JAVA_HOME("java.home"),
/** Java Virtual Machine specification version. */
JAVA_VM_SPECIFICATION_VERSION("java.vm.specification.version"),
/** Java Virtual Machine specification vendor. */
JAVA_VM_SPECIFICATION_VENDOR("java.vm.specification.vendor"),
/** Java Virtual Machine specification name. */
JAVA_VM_SPECIFICATION_NAME("java.vm.specification.name"),
/** Java Virtual Machine implementation version. */
JAVA_VM_VERSION("java.vm.version"),
/** Java Virtual Machine implementation vendor. */
JAVA_VM_VENDOR("java.vm.vendor"),
/** Java Virtual Machine implementation name. */
JAVA_VM_NAME("java.vm.name"),
/** Java Runtime Environment specification version. */
JAVA_SPECIFICATION_VERSION("java.specification.version"),
/** Java Runtime Environment specification vendor. */
JAVA_SPECIFICATION_VENDOR("java.specification.vendor"),
/** Java Runtime Environment specification name. */
JAVA_SPECIFICATION_NAME("java.specification.name"),
/** Java class format version number. */
JAVA_CLASS_VERSION("java.class.version"),
/** Java class path. */
JAVA_CLASS_PATH("java.class.path"),
/** List of paths to search when loading libraries. */
JAVA_LIBRARY_PATH("java.library.path"),
/** Default temp file path. */
JAVA_IO_TMPDIR("java.io.tmpdir"),
/** Name of JIT compiler to use. */
JAVA_COMPILER("java.compiler"),
/**
* Path of extension directory or directories.
*
* @deprecated This property was deprecated in
* Java 8 and removed in Java 9. We do not plan to remove this API from Guava, but if you are
* using it, it is probably not doing what you want.
*/
@Deprecated
JAVA_EXT_DIRS("java.ext.dirs"),
/** Operating system name. */
OS_NAME("os.name"),
/** Operating system architecture. */
OS_ARCH("os.arch"),
/** Operating system version. */
OS_VERSION("os.version"),
/** File separator ("/" on UNIX). */
FILE_SEPARATOR("file.separator"),
/** Path separator (":" on UNIX). */
PATH_SEPARATOR("path.separator"),
/** Line separator ("\n" on UNIX). */
LINE_SEPARATOR("line.separator"),
/** User's account name. */
USER_NAME("user.name"),
/** User's home directory. */
USER_HOME("user.home"),
/** User's current working directory. */
USER_DIR("user.dir");
private final String key;
StandardSystemProperty(String key) {
this.key = key;
}
/** Returns the key used to look up this system property. */
public String key() {
return key;
}
/**
* Returns the current value for this system property by delegating to {@link
* System#getProperty(String)}.
*
* The value returned by this method is non-null except in rare circumstances:
*
*
* - {@link #JAVA_EXT_DIRS} was deprecated in Java 8 and removed in Java 9. We have not
* confirmed whether it is available under older versions.
*
- {@link #JAVA_COMPILER}, while still listed as required as of Java 15, is typically not
* available even under older version.
*
- Any property may be cleared through APIs like {@link System#clearProperty}.
*
- Unusual environments like GWT may have their own special handling of system properties.
*
*
* Note that {@code StandardSystemProperty} does not provide constants for more recently added
* properties, including:
*
*
* - {@code java.vendor.version} (added in Java 11, listed as optional as of Java 13)
*
- {@code jdk.module.*} (added in Java 9, optional)
*
*/
@CheckForNull
public String value() {
return System.getProperty(key);
}
/** Returns a string representation of this system property. */
@Override
public String toString() {
return key() + "=" + value();
}
}