jodd.util.SystemUtil Maven / Gradle / Ivy
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package jodd.util;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Objects;
public class SystemUtil {
/**
* Returns system property or {@code null} if not set.
*/
public static String get(final String name) {
return get(name, null);
}
/**
* Returns system property. If key is not available, returns the default value.
*/
public static String get(final String name, final String defaultValue) {
Objects.requireNonNull(name);
String value = null;
try {
if (System.getSecurityManager() == null) {
value = System.getProperty(name);
} else {
value = AccessController.doPrivileged((PrivilegedAction) () -> System.getProperty(name));
}
} catch (final Exception ignore) {
}
if (value == null) {
return defaultValue;
}
return value;
}
/**
* Returns system property as boolean.
*/
public static boolean getBoolean(final String name, final boolean defaultValue) {
String value = get(name);
if (value == null) {
return defaultValue;
}
value = value.trim().toLowerCase();
switch (value) {
case "true" :
case "yes" :
case "1" :
case "on" :
return true;
case "false":
case "no" :
case "0" :
case "off" :
return false;
default:
return defaultValue;
}
}
/**
* Returns system property as an int.
*/
public static long getInt(final String name, final int defaultValue) {
String value = get(name);
if (value == null) {
return defaultValue;
}
value = value.trim().toLowerCase();
try {
return Integer.parseInt(value);
}
catch (final NumberFormatException nfex) {
return defaultValue;
}
}
/**
* Returns system property as a long.
*/
public static long getLong(final String name, final long defaultValue) {
String value = get(name);
if (value == null) {
return defaultValue;
}
value = value.trim().toLowerCase();
try {
return Long.parseLong(value);
}
catch (final NumberFormatException nfex) {
return defaultValue;
}
}
// ---------------------------------------------------------------- infos
private static final SystemInfo systemInfo = new SystemInfo();
/**
* Returns system information.
*/
public static SystemInfo info() {
return systemInfo;
}
}