org.slf4j.helpers.Util 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) 2004-2011 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j.helpers;
/**
* An internal utility class.
*
* @author Alexander Dorokhine
* @author Ceki Gülcü
*/
public final class Util {
private Util() {
}
public static String safeGetSystemProperty(String key) {
if (key == null)
throw new IllegalArgumentException("null input");
String result = null;
try {
result = System.getProperty(key);
} catch (java.lang.SecurityException sm) {
; // ignore
}
return result;
}
public static boolean safeGetBooleanSystemProperty(String key) {
String value = safeGetSystemProperty(key);
if (value == null)
return false;
else
return value.equalsIgnoreCase("true");
}
/**
* In order to call {@link SecurityManager#getClassContext()}, which is a
* protected method, we add this wrapper which allows the method to be visible
* inside this package.
*/
private static final class ClassContextSecurityManager extends SecurityManager {
protected Class[] getClassContext() {
return super.getClassContext();
}
}
private static ClassContextSecurityManager SECURITY_MANAGER;
private static boolean SECURITY_MANAGER_CREATION_ALREADY_ATTEMPTED = false;
private static ClassContextSecurityManager getSecurityManager() {
if (SECURITY_MANAGER != null)
return SECURITY_MANAGER;
else if (SECURITY_MANAGER_CREATION_ALREADY_ATTEMPTED)
return null;
else {
SECURITY_MANAGER = safeCreateSecurityManager();
SECURITY_MANAGER_CREATION_ALREADY_ATTEMPTED = true;
return SECURITY_MANAGER;
}
}
private static ClassContextSecurityManager safeCreateSecurityManager() {
try {
return new ClassContextSecurityManager();
} catch (java.lang.SecurityException sm) {
return null;
}
}
/**
* Returns the name of the class which called the invoking method.
*
* @return the name of the class which called the invoking method.
*/
public static Class getCallingClass() {
ClassContextSecurityManager securityManager = getSecurityManager();
if (securityManager == null)
return null;
Class[] trace = securityManager.getClassContext();
String thisClassName = Util.class.getName();
// Advance until Util is found
int i;
for (i = 0; i < trace.length; i++) {
if (thisClassName.equals(trace[i].getName()))
break;
}
// trace[i] = Util; trace[i+1] = caller; trace[i+2] = caller's caller
if (i >= trace.length || i + 2 >= trace.length) {
throw new IllegalStateException("Failed to find org.slf4j.helpers.Util or its caller in the stack; " + "this should not happen");
}
return trace[i + 2];
}
/**
* See {@link Reporter#error(String, Throwable)} class for alternative.
*
* @deprecated replaced by the {@link Reporter#error(String, Throwable)} method.
* @param msg message to print
* @param t throwable to print
*/
static final public void report(String msg, Throwable t) {
System.err.println(msg);
System.err.println("Reported exception:");
t.printStackTrace();
}
/**
* See {@link Reporter} class for alternatives.
*
* @deprecated replaced by one of {@link Reporter#info(String)},
* {@link Reporter#warn(String)} or {@link Reporter#error(String)} methods.
* @param msg message to print
*/
static final public void report(String msg) {
System.err.println("SLF4J: " + msg);
}
}