| /** |
| * 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); |
| } |
| |
| } |