Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import ch.qos.logback.classic.ClassicConstants;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.selector.ContextJNDISelector;
import ch.qos.logback.classic.selector.ContextSelector;
import ch.qos.logback.classic.selector.DefaultContextSelector;
import ch.qos.logback.core.util.Loader;
import ch.qos.logback.core.util.OptionHelper;

Holds the context selector for use in the current environment.
Author:
Ceki Gülcü
Since:
0.9.19/**
 * Holds the context selector for use in the current environment.
 * 
 * @author Ceki Gülcü
 * @since 0.9.19
 */
public class ContextSelectorStaticBinder {

    static ContextSelectorStaticBinder singleton = new ContextSelectorStaticBinder();

    ContextSelector contextSelector;
    Object key;

    public static ContextSelectorStaticBinder getSingleton() {
        return singleton;
    }

    
FOR INTERNAL USE. This method is intended for use by  StaticLoggerBinder.
 
Params:
defaultLoggerContext – 
Throws:
ClassNotFoundException – 
NoSuchMethodException – 
InstantiationException – 
IllegalAccessException – 
InvocationTargetException – /**
     * FOR INTERNAL USE. This method is intended for use by  StaticLoggerBinder.
     *  
     * @param defaultLoggerContext
     * @throws ClassNotFoundException
     * @throws NoSuchMethodException
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public void init(LoggerContext defaultLoggerContext, Object key) throws ClassNotFoundException, NoSuchMethodException, InstantiationException,
                    IllegalAccessException, InvocationTargetException {
        if (this.key == null) {
            this.key = key;
        } else if (this.key != key) {
            throw new IllegalAccessException("Only certain classes can access this method.");
        }

        String contextSelectorStr = OptionHelper.getSystemProperty(ClassicConstants.LOGBACK_CONTEXT_SELECTOR);
        if (contextSelectorStr == null) {
            contextSelector = new DefaultContextSelector(defaultLoggerContext);
        } else if (contextSelectorStr.equals("JNDI")) {
            // if jndi is specified, let's use the appropriate class
            contextSelector = new ContextJNDISelector(defaultLoggerContext);
        } else {
            contextSelector = dynamicalContextSelector(defaultLoggerContext, contextSelectorStr);
        }
    }

    
Instantiate the context selector class designated by the user. The selector
must have a constructor taking a LoggerContext instance as an argument.
Params:
defaultLoggerContext – 
contextSelectorStr – 
Throws:
ClassNotFoundException – 
SecurityException – 
NoSuchMethodException – 
IllegalArgumentException – 
InstantiationException – 
IllegalAccessException – 
InvocationTargetException – 
Returns:
an instance of the designated context selector class/**
     * Instantiate the context selector class designated by the user. The selector
     * must have a constructor taking a LoggerContext instance as an argument.
     * 
     * @param defaultLoggerContext
     * @param contextSelectorStr
     * @return an instance of the designated context selector class
     * @throws ClassNotFoundException
     * @throws SecurityException
     * @throws NoSuchMethodException
     * @throws IllegalArgumentException
     * @throws InstantiationException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    static ContextSelector dynamicalContextSelector(LoggerContext defaultLoggerContext, String contextSelectorStr) throws ClassNotFoundException,
                    SecurityException, NoSuchMethodException, IllegalArgumentException, InstantiationException, IllegalAccessException,
                    InvocationTargetException {
        Class<?> contextSelectorClass = Loader.loadClass(contextSelectorStr);
        Constructor cons = contextSelectorClass.getConstructor(new Class[] { LoggerContext.class });
        return (ContextSelector) cons.newInstance(defaultLoggerContext);
    }

    public ContextSelector getContextSelector() {
        return contextSelector;
    }

}