slf4j-api/src/main/java/org/slf4j/LoggerFactory.java - platform/external/slf4j - Gitiles

 /**
  * 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;

 import java.io.IOException;
 import java.net.URL;
 import java.util.Arrays;
 import java.util.Enumeration;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;

 import javax.annotation.Nonnull;

 import org.slf4j.helpers.NOPLoggerFactory;
 import org.slf4j.helpers.SubstituteLogger;
 import org.slf4j.helpers.SubstituteLoggerFactory;
 import org.slf4j.helpers.Util;
 import org.slf4j.impl.StaticLoggerBinder;

 /**
  * The <code>LoggerFactory</code> is a utility class producing Loggers for
  * various logging APIs, most notably for log4j, logback and JDK 1.4 logging.
  * Other implementations such as {@link org.slf4j.impl.NOPLogger NOPLogger} and
  * {@link org.slf4j.impl.SimpleLogger SimpleLogger} are also supported.
  * <p/>
  * <p/>
  * <code>LoggerFactory</code> is essentially a wrapper around an
  * {@link ILoggerFactory} instance bound with <code>LoggerFactory</code> at
  * compile time.
  * <p/>
  * <p/>
  * Please note that all methods in <code>LoggerFactory</code> are static.
  *
  *
  * @author Alexander Dorokhine
  * @author Robert Elliot
  * @author Ceki G&uuml;lc&uuml;
  *
  */
 public final class LoggerFactory {

   static final String CODES_PREFIX = "http://www.slf4j.org/codes.html";

   static final String NO_STATICLOGGERBINDER_URL = CODES_PREFIX + "#StaticLoggerBinder";
   static final String MULTIPLE_BINDINGS_URL = CODES_PREFIX + "#multiple_bindings";
   static final String NULL_LF_URL = CODES_PREFIX + "#null_LF";
   static final String VERSION_MISMATCH = CODES_PREFIX + "#version_mismatch";
   static final String SUBSTITUTE_LOGGER_URL = CODES_PREFIX + "#substituteLogger";
   static final String LOGGER_NAME_MISMATCH_URL = CODES_PREFIX + "#loggerNameMismatch";

   static final String UNSUCCESSFUL_INIT_URL = CODES_PREFIX + "#unsuccessfulInit";
   static final String UNSUCCESSFUL_INIT_MSG = "org.slf4j.LoggerFactory could not be successfully initialized. See also "
       + UNSUCCESSFUL_INIT_URL;

   static final int UNINITIALIZED = 0;
   static final int ONGOING_INITIALIZATION = 1;
   static final int FAILED_INITIALIZATION = 2;
   static final int SUCCESSFUL_INITIALIZATION = 3;
   static final int NOP_FALLBACK_INITIALIZATION = 4;

   static int INITIALIZATION_STATE = UNINITIALIZED;
   static SubstituteLoggerFactory TEMP_FACTORY = new SubstituteLoggerFactory();
   static NOPLoggerFactory NOP_FALLBACK_FACTORY = new NOPLoggerFactory();

   // Support for detecting mismatched logger names.
   static final String DETECT_LOGGER_NAME_MISMATCH_PROPERTY = "slf4j.detectLoggerNameMismatch";
   static boolean DETECT_LOGGER_NAME_MISMATCH = Boolean.getBoolean(DETECT_LOGGER_NAME_MISMATCH_PROPERTY);

   /**
    * It is LoggerFactory's responsibility to track version changes and manage
    * the compatibility list.
    * <p/>
    * <p/>
    * It is assumed that all versions in the 1.6 are mutually compatible.
    */
   static private final String[] API_COMPATIBILITY_LIST = new String[] { "1.6", "1.7" };

   // private constructor prevents instantiation
   private LoggerFactory() {
   }

   /**
    * Force LoggerFactory to consider itself uninitialized.
    * <p/>
    * <p/>
    * This method is intended to be called by classes (in the same package) for
    * testing purposes. This method is internal. It can be modified, renamed or
    * removed at any time without notice.
    * <p/>
    * <p/>
    * You are strongly discouraged from calling this method in production code.
    */
   static void reset() {
     INITIALIZATION_STATE = UNINITIALIZED;
     TEMP_FACTORY = new SubstituteLoggerFactory();
   }

   private final static void performInitialization() {
     bind();
     if (INITIALIZATION_STATE == SUCCESSFUL_INITIALIZATION) {
       versionSanityCheck();
     }
   }

   private static boolean messageContainsOrgSlf4jImplStaticLoggerBinder(String msg) {
     if (msg == null)
       return false;
     if (msg.indexOf("org/slf4j/impl/StaticLoggerBinder") != -1)
       return true;
     if (msg.indexOf("org.slf4j.impl.StaticLoggerBinder") != -1)
       return true;
     return false;
   }

   private final static void bind() {
     try {
       Set<URL> staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();
       reportMultipleBindingAmbiguity(staticLoggerBinderPathSet);
       // the next line does the binding
       StaticLoggerBinder.getSingleton();
       INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;
       reportActualBinding(staticLoggerBinderPathSet);
       fixSubstitutedLoggers();
     } catch (NoClassDefFoundError ncde) {
       String msg = ncde.getMessage();
       if (messageContainsOrgSlf4jImplStaticLoggerBinder(msg)) {
         INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;
         Util.report("Failed to load class \"org.slf4j.impl.StaticLoggerBinder\".");
         Util.report("Defaulting to no-operation (NOP) logger implementation");
         Util.report("See " + NO_STATICLOGGERBINDER_URL + " for further details.");
       } else {
         failedBinding(ncde);
         throw ncde;
       }
     } catch (java.lang.NoSuchMethodError nsme) {
       String msg = nsme.getMessage();
       if (msg != null && msg.indexOf("org.slf4j.impl.StaticLoggerBinder.getSingleton()") != -1) {
         INITIALIZATION_STATE = FAILED_INITIALIZATION;
         Util.report("slf4j-api 1.6.x (or later) is incompatible with this binding.");
         Util.report("Your binding is version 1.5.5 or earlier.");
         Util.report("Upgrade your binding to version 1.6.x.");
       }
       throw nsme;
     } catch (Exception e) {
       failedBinding(e);
       throw new IllegalStateException("Unexpected initialization failure", e);
     }
   }

   static void failedBinding(Throwable t) {
     INITIALIZATION_STATE = FAILED_INITIALIZATION;
     Util.report("Failed to instantiate SLF4J LoggerFactory", t);
   }

   private final static void fixSubstitutedLoggers() {
     List<SubstituteLogger> loggers = TEMP_FACTORY.getLoggers();

     if (loggers.isEmpty()) {
       return;
     }

     Util.report("The following set of substitute loggers may have been accessed");
     Util.report("during the initialization phase. Logging calls during this");
     Util.report("phase were not honored. However, subsequent logging calls to these");
     Util.report("loggers will work as normally expected.");
     Util.report("See also " + SUBSTITUTE_LOGGER_URL);
     for (SubstituteLogger subLogger : loggers) {
       subLogger.setDelegate(getLogger(subLogger.getName()));
       Util.report(subLogger.getName());
     }

     TEMP_FACTORY.clear();
   }

   private final static void versionSanityCheck() {
     try {
       String requested = StaticLoggerBinder.REQUESTED_API_VERSION;

       boolean match = false;
       for (int i = 0; i < API_COMPATIBILITY_LIST.length; i++) {
         if (requested.startsWith(API_COMPATIBILITY_LIST[i])) {
           match = true;
         }
       }
       if (!match) {
         Util.report("The requested version " + requested + " by your slf4j binding is not compatible with "
             + Arrays.asList(API_COMPATIBILITY_LIST).toString());
         Util.report("See " + VERSION_MISMATCH + " for further details.");
       }
     } catch (java.lang.NoSuchFieldError nsfe) {
       // given our large user base and SLF4J's commitment to backward
       // compatibility, we cannot cry here. Only for implementations
       // which willingly declare a REQUESTED_API_VERSION field do we
       // emit compatibility warnings.
     } catch (Throwable e) {
       // we should never reach here
       Util.report("Unexpected problem occured during version sanity check", e);
     }
   }

   // We need to use the name of the StaticLoggerBinder class, but we can't reference
   // the class itself.
   private static String STATIC_LOGGER_BINDER_PATH = "org/slf4j/impl/StaticLoggerBinder.class";

   private static Set<URL> findPossibleStaticLoggerBinderPathSet() {
     // use Set instead of list in order to deal with bug #138
     // LinkedHashSet appropriate here because it preserves insertion order during iteration
     Set<URL> staticLoggerBinderPathSet = new LinkedHashSet<URL>();
     try {
       ClassLoader loggerFactoryClassLoader = LoggerFactory.class.getClassLoader();
       Enumeration<URL> paths;
       if (loggerFactoryClassLoader == null) {
         paths = ClassLoader.getSystemResources(STATIC_LOGGER_BINDER_PATH);
       } else {
         paths = loggerFactoryClassLoader.getResources(STATIC_LOGGER_BINDER_PATH);
       }
       while (paths.hasMoreElements()) {
         URL path = (URL) paths.nextElement();
         staticLoggerBinderPathSet.add(path);
       }
     } catch (IOException ioe) {
       Util.report("Error getting resources from path", ioe);
     }
     return staticLoggerBinderPathSet;
   }

   private static boolean isAmbiguousStaticLoggerBinderPathSet(Set<URL> staticLoggerBinderPathSet) {
     return staticLoggerBinderPathSet.size() > 1;
   }

   /**
    * Prints a warning message on the console if multiple bindings were found on the class path.
    * No reporting is done otherwise.
    *
    */
   private static void reportMultipleBindingAmbiguity(Set<URL> staticLoggerBinderPathSet) {
     if (isAmbiguousStaticLoggerBinderPathSet(staticLoggerBinderPathSet)) {
       Util.report("Class path contains multiple SLF4J bindings.");
       Iterator<URL> iterator = staticLoggerBinderPathSet.iterator();
       while (iterator.hasNext()) {
         URL path = (URL) iterator.next();
         Util.report("Found binding in [" + path + "]");
       }
       Util.report("See " + MULTIPLE_BINDINGS_URL + " for an explanation.");
     }
   }

   private static void reportActualBinding(Set<URL> staticLoggerBinderPathSet) {
     if (isAmbiguousStaticLoggerBinderPathSet(staticLoggerBinderPathSet)) {
       Util.report("Actual binding is of type [" + StaticLoggerBinder.getSingleton().getLoggerFactoryClassStr() + "]");
     }
   }

   /**
    * Return a logger named according to the name parameter using the statically
    * bound {@link ILoggerFactory} instance.
    *
    * @param name The name of the logger.
    * @return logger
    */
   @Nonnull
   public static Logger getLogger(@Nonnull String name) {
     ILoggerFactory iLoggerFactory = getILoggerFactory();
     return iLoggerFactory.getLogger(name);
   }

   /**
    * Return a logger named corresponding to the class passed as parameter, using
    * the statically bound {@link ILoggerFactory} instance.
    *
    * @param clazz the returned logger will be named after clazz
    * @return logger
    */
   @Nonnull
   public static Logger getLogger(@Nonnull Class<?> clazz) {
     Logger logger = getLogger(clazz.getName());
     if (DETECT_LOGGER_NAME_MISMATCH) {
       Class<?> autoComputedCallingClass = Util.getCallingClass();
       if (nonMatchingClasses(clazz, autoComputedCallingClass)) {
         Util.report(String.format("Detected logger name mismatch. Given name: \"%s\"; computed name: \"%s\".",
             logger.getName(), autoComputedCallingClass.getName()));
         Util.report("See " + LOGGER_NAME_MISMATCH_URL + " for an explanation");
       }
     }
     return logger;
   }

   private static boolean nonMatchingClasses(Class<?> clazz, Class<?> autoComputedCallingClass) {
     return !autoComputedCallingClass.isAssignableFrom(clazz);
   }

   /**
    * Return the {@link ILoggerFactory} instance in use.
    * <p/>
    * <p/>
    * ILoggerFactory instance is bound with this class at compile time.
    *
    * @return the ILoggerFactory instance in use
    */
   @Nonnull
   public static ILoggerFactory getILoggerFactory() {
     if (INITIALIZATION_STATE == UNINITIALIZED) {
       INITIALIZATION_STATE = ONGOING_INITIALIZATION;
       performInitialization();
     }
     switch (INITIALIZATION_STATE) {
     case SUCCESSFUL_INITIALIZATION:
       return StaticLoggerBinder.getSingleton().getLoggerFactory();
     case NOP_FALLBACK_INITIALIZATION:
       return NOP_FALLBACK_FACTORY;
     case FAILED_INITIALIZATION:
       throw new IllegalStateException(UNSUCCESSFUL_INIT_MSG);
     case ONGOING_INITIALIZATION:
       // support re-entrant behavior.
       // See also http://bugzilla.slf4j.org/show_bug.cgi?id=106
       return TEMP_FACTORY;
     }
     throw new IllegalStateException("Unreachable code");
   }
 }
	/**
	* 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;

	import java.io.IOException;
	import java.net.URL;
	import java.util.Arrays;
	import java.util.Enumeration;
	import java.util.Iterator;
	import java.util.LinkedHashSet;
	import java.util.List;
	import java.util.Set;

	import javax.annotation.Nonnull;

	import org.slf4j.helpers.NOPLoggerFactory;
	import org.slf4j.helpers.SubstituteLogger;
	import org.slf4j.helpers.SubstituteLoggerFactory;
	import org.slf4j.helpers.Util;
	import org.slf4j.impl.StaticLoggerBinder;

	/**
	* The <code>LoggerFactory</code> is a utility class producing Loggers for
	* various logging APIs, most notably for log4j, logback and JDK 1.4 logging.
	* Other implementations such as {@link org.slf4j.impl.NOPLogger NOPLogger} and
	* {@link org.slf4j.impl.SimpleLogger SimpleLogger} are also supported.
	* <p/>
	* <p/>
	* <code>LoggerFactory</code> is essentially a wrapper around an
	* {@link ILoggerFactory} instance bound with <code>LoggerFactory</code> at
	* compile time.
	* <p/>
	* <p/>
	* Please note that all methods in <code>LoggerFactory</code> are static.
	*
	*
	* @author Alexander Dorokhine
	* @author Robert Elliot
	* @author Ceki Gülcü
	*
	*/
	public final class LoggerFactory {

	static final String CODES_PREFIX = "http://www.slf4j.org/codes.html";

	static final String NO_STATICLOGGERBINDER_URL = CODES_PREFIX + "#StaticLoggerBinder";
	static final String MULTIPLE_BINDINGS_URL = CODES_PREFIX + "#multiple_bindings";
	static final String NULL_LF_URL = CODES_PREFIX + "#null_LF";
	static final String VERSION_MISMATCH = CODES_PREFIX + "#version_mismatch";
	static final String SUBSTITUTE_LOGGER_URL = CODES_PREFIX + "#substituteLogger";
	static final String LOGGER_NAME_MISMATCH_URL = CODES_PREFIX + "#loggerNameMismatch";

	static final String UNSUCCESSFUL_INIT_URL = CODES_PREFIX + "#unsuccessfulInit";
	static final String UNSUCCESSFUL_INIT_MSG = "org.slf4j.LoggerFactory could not be successfully initialized. See also "
	+ UNSUCCESSFUL_INIT_URL;

	static final int UNINITIALIZED = 0;
	static final int ONGOING_INITIALIZATION = 1;
	static final int FAILED_INITIALIZATION = 2;
	static final int SUCCESSFUL_INITIALIZATION = 3;
	static final int NOP_FALLBACK_INITIALIZATION = 4;

	static int INITIALIZATION_STATE = UNINITIALIZED;
	static SubstituteLoggerFactory TEMP_FACTORY = new SubstituteLoggerFactory();
	static NOPLoggerFactory NOP_FALLBACK_FACTORY = new NOPLoggerFactory();

	// Support for detecting mismatched logger names.
	static final String DETECT_LOGGER_NAME_MISMATCH_PROPERTY = "slf4j.detectLoggerNameMismatch";
	static boolean DETECT_LOGGER_NAME_MISMATCH = Boolean.getBoolean(DETECT_LOGGER_NAME_MISMATCH_PROPERTY);

	/**
	* It is LoggerFactory's responsibility to track version changes and manage
	* the compatibility list.
	* <p/>
	* <p/>
	* It is assumed that all versions in the 1.6 are mutually compatible.
	*/
	static private final String[] API_COMPATIBILITY_LIST = new String[] { "1.6", "1.7" };

	// private constructor prevents instantiation
	private LoggerFactory() {
	}

	/**
	* Force LoggerFactory to consider itself uninitialized.
	* <p/>
	* <p/>
	* This method is intended to be called by classes (in the same package) for
	* testing purposes. This method is internal. It can be modified, renamed or
	* removed at any time without notice.
	* <p/>
	* <p/>
	* You are strongly discouraged from calling this method in production code.
	*/
	static void reset() {
	INITIALIZATION_STATE = UNINITIALIZED;
	TEMP_FACTORY = new SubstituteLoggerFactory();
	}

	private final static void performInitialization() {
	bind();
	if (INITIALIZATION_STATE == SUCCESSFUL_INITIALIZATION) {
	versionSanityCheck();
	}
	}

	private static boolean messageContainsOrgSlf4jImplStaticLoggerBinder(String msg) {
	if (msg == null)
	return false;
	if (msg.indexOf("org/slf4j/impl/StaticLoggerBinder") != -1)
	return true;
	if (msg.indexOf("org.slf4j.impl.StaticLoggerBinder") != -1)
	return true;
	return false;
	}

	private final static void bind() {
	try {
	Set<URL> staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();
	reportMultipleBindingAmbiguity(staticLoggerBinderPathSet);
	// the next line does the binding
	StaticLoggerBinder.getSingleton();
	INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;
	reportActualBinding(staticLoggerBinderPathSet);
	fixSubstitutedLoggers();
	} catch (NoClassDefFoundError ncde) {
	String msg = ncde.getMessage();
	if (messageContainsOrgSlf4jImplStaticLoggerBinder(msg)) {
	INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;
	Util.report("Failed to load class \"org.slf4j.impl.StaticLoggerBinder\".");
	Util.report("Defaulting to no-operation (NOP) logger implementation");
	Util.report("See " + NO_STATICLOGGERBINDER_URL + " for further details.");
	} else {
	failedBinding(ncde);
	throw ncde;
	}
	} catch (java.lang.NoSuchMethodError nsme) {
	String msg = nsme.getMessage();
	if (msg != null && msg.indexOf("org.slf4j.impl.StaticLoggerBinder.getSingleton()") != -1) {
	INITIALIZATION_STATE = FAILED_INITIALIZATION;
	Util.report("slf4j-api 1.6.x (or later) is incompatible with this binding.");
	Util.report("Your binding is version 1.5.5 or earlier.");
	Util.report("Upgrade your binding to version 1.6.x.");
	}
	throw nsme;
	} catch (Exception e) {
	failedBinding(e);
	throw new IllegalStateException("Unexpected initialization failure", e);
	}
	}

	static void failedBinding(Throwable t) {
	INITIALIZATION_STATE = FAILED_INITIALIZATION;
	Util.report("Failed to instantiate SLF4J LoggerFactory", t);
	}

	private final static void fixSubstitutedLoggers() {
	List<SubstituteLogger> loggers = TEMP_FACTORY.getLoggers();

	if (loggers.isEmpty()) {
	return;
	}

	Util.report("The following set of substitute loggers may have been accessed");
	Util.report("during the initialization phase. Logging calls during this");
	Util.report("phase were not honored. However, subsequent logging calls to these");
	Util.report("loggers will work as normally expected.");
	Util.report("See also " + SUBSTITUTE_LOGGER_URL);
	for (SubstituteLogger subLogger : loggers) {
	subLogger.setDelegate(getLogger(subLogger.getName()));
	Util.report(subLogger.getName());
	}

	TEMP_FACTORY.clear();
	}

	private final static void versionSanityCheck() {
	try {
	String requested = StaticLoggerBinder.REQUESTED_API_VERSION;

	boolean match = false;
	for (int i = 0; i < API_COMPATIBILITY_LIST.length; i++) {
	if (requested.startsWith(API_COMPATIBILITY_LIST[i])) {
	match = true;
	}
	}
	if (!match) {
	Util.report("The requested version " + requested + " by your slf4j binding is not compatible with "
	+ Arrays.asList(API_COMPATIBILITY_LIST).toString());
	Util.report("See " + VERSION_MISMATCH + " for further details.");
	}
	} catch (java.lang.NoSuchFieldError nsfe) {
	// given our large user base and SLF4J's commitment to backward
	// compatibility, we cannot cry here. Only for implementations
	// which willingly declare a REQUESTED_API_VERSION field do we
	// emit compatibility warnings.
	} catch (Throwable e) {
	// we should never reach here
	Util.report("Unexpected problem occured during version sanity check", e);
	}
	}

	// We need to use the name of the StaticLoggerBinder class, but we can't reference
	// the class itself.
	private static String STATIC_LOGGER_BINDER_PATH = "org/slf4j/impl/StaticLoggerBinder.class";

	private static Set<URL> findPossibleStaticLoggerBinderPathSet() {
	// use Set instead of list in order to deal with bug #138
	// LinkedHashSet appropriate here because it preserves insertion order during iteration
	Set<URL> staticLoggerBinderPathSet = new LinkedHashSet<URL>();
	try {
	ClassLoader loggerFactoryClassLoader = LoggerFactory.class.getClassLoader();
	Enumeration<URL> paths;
	if (loggerFactoryClassLoader == null) {
	paths = ClassLoader.getSystemResources(STATIC_LOGGER_BINDER_PATH);
	} else {
	paths = loggerFactoryClassLoader.getResources(STATIC_LOGGER_BINDER_PATH);
	}
	while (paths.hasMoreElements()) {
	URL path = (URL) paths.nextElement();
	staticLoggerBinderPathSet.add(path);
	}
	} catch (IOException ioe) {
	Util.report("Error getting resources from path", ioe);
	}
	return staticLoggerBinderPathSet;
	}

	private static boolean isAmbiguousStaticLoggerBinderPathSet(Set<URL> staticLoggerBinderPathSet) {
	return staticLoggerBinderPathSet.size() > 1;
	}

	/**
	* Prints a warning message on the console if multiple bindings were found on the class path.
	* No reporting is done otherwise.
	*
	*/
	private static void reportMultipleBindingAmbiguity(Set<URL> staticLoggerBinderPathSet) {
	if (isAmbiguousStaticLoggerBinderPathSet(staticLoggerBinderPathSet)) {
	Util.report("Class path contains multiple SLF4J bindings.");
	Iterator<URL> iterator = staticLoggerBinderPathSet.iterator();
	while (iterator.hasNext()) {
	URL path = (URL) iterator.next();
	Util.report("Found binding in [" + path + "]");
	}
	Util.report("See " + MULTIPLE_BINDINGS_URL + " for an explanation.");
	}
	}

	private static void reportActualBinding(Set<URL> staticLoggerBinderPathSet) {
	if (isAmbiguousStaticLoggerBinderPathSet(staticLoggerBinderPathSet)) {
	Util.report("Actual binding is of type [" + StaticLoggerBinder.getSingleton().getLoggerFactoryClassStr() + "]");
	}
	}

	/**
	* Return a logger named according to the name parameter using the statically
	* bound {@link ILoggerFactory} instance.
	*
	* @param name The name of the logger.
	* @return logger
	*/
	@Nonnull
	public static Logger getLogger(@Nonnull String name) {
	ILoggerFactory iLoggerFactory = getILoggerFactory();
	return iLoggerFactory.getLogger(name);
	}

	/**
	* Return a logger named corresponding to the class passed as parameter, using
	* the statically bound {@link ILoggerFactory} instance.
	*
	* @param clazz the returned logger will be named after clazz
	* @return logger
	*/
	@Nonnull
	public static Logger getLogger(@Nonnull Class<?> clazz) {
	Logger logger = getLogger(clazz.getName());
	if (DETECT_LOGGER_NAME_MISMATCH) {
	Class<?> autoComputedCallingClass = Util.getCallingClass();
	if (nonMatchingClasses(clazz, autoComputedCallingClass)) {
	Util.report(String.format("Detected logger name mismatch. Given name: \"%s\"; computed name: \"%s\".",
	logger.getName(), autoComputedCallingClass.getName()));
	Util.report("See " + LOGGER_NAME_MISMATCH_URL + " for an explanation");
	}
	}
	return logger;
	}

	private static boolean nonMatchingClasses(Class<?> clazz, Class<?> autoComputedCallingClass) {
	return !autoComputedCallingClass.isAssignableFrom(clazz);
	}

	/**
	* Return the {@link ILoggerFactory} instance in use.
	* <p/>
	* <p/>
	* ILoggerFactory instance is bound with this class at compile time.
	*
	* @return the ILoggerFactory instance in use
	*/
	@Nonnull
	public static ILoggerFactory getILoggerFactory() {
	if (INITIALIZATION_STATE == UNINITIALIZED) {
	INITIALIZATION_STATE = ONGOING_INITIALIZATION;
	performInitialization();
	}
	switch (INITIALIZATION_STATE) {
	case SUCCESSFUL_INITIALIZATION:
	return StaticLoggerBinder.getSingleton().getLoggerFactory();
	case NOP_FALLBACK_INITIALIZATION:
	return NOP_FALLBACK_FACTORY;
	case FAILED_INITIALIZATION:
	throw new IllegalStateException(UNSUCCESSFUL_INIT_MSG);
	case ONGOING_INITIALIZATION:
	// support re-entrant behavior.
	// See also http://bugzilla.slf4j.org/show_bug.cgi?id=106
	return TEMP_FACTORY;
	}
	throw new IllegalStateException("Unreachable code");
	}
	}