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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j.config;

import org.apache.log4j.Appender;
import org.apache.log4j.Category;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Hashtable;

/**
   Prints the configuration of the log4j default hierarchy
   (which needs to be auto-initialized) as a propoperties file
   on a {@link PrintWriter}.
   
   @author  Anders Kristensen
 */
public class PropertyPrinter implements PropertyGetter.PropertyCallback {
  protected int numAppenders = 0;
  protected Hashtable appenderNames = new Hashtable();
  protected Hashtable layoutNames   = new Hashtable();
  protected PrintWriter out;
  protected boolean doCapitalize;
  
  public
  PropertyPrinter(PrintWriter out) {
    this(out, false);
  }
  
  public
  PropertyPrinter(PrintWriter out, boolean doCapitalize) {
    this.out = out;
    this.doCapitalize = doCapitalize;
    
    print(out);
    out.flush();
  }
  
  protected
  String genAppName() {
    return "A" + numAppenders++;
  }
  
  /**
   * Returns true if the specified appender name is considered to have
   * been generated, that is, if it is of the form A[0-9]+.
  */
  protected
  boolean isGenAppName(String name) {
    if (name.length() < 2 || name.charAt(0) != 'A') return false;
    
    for (int i = 0; i < name.length(); i++) {
      if (name.charAt(i) < '0' || name.charAt(i) > '9') return false;
    }
    return true;
  }
  
  /**
   * Prints the configuration of the default log4j hierarchy as a Java
   * properties file on the specified Writer.
   * 
   * 

N.B. print() can be invoked only once! */ public void print(PrintWriter out) { printOptions(out, Logger.getRootLogger()); Enumeration cats = LogManager.getCurrentLoggers(); while (cats.hasMoreElements()) { printOptions(out, (Logger) cats.nextElement()); } } /** * @since 1.2.15 */ protected void printOptions(PrintWriter out, Category cat) { Enumeration appenders = cat.getAllAppenders(); Level prio = cat.getLevel(); String appenderString = (prio == null ? "" : prio.toString()); while (appenders.hasMoreElements()) { Appender app = (Appender) appenders.nextElement(); String name; if ((name = (String) appenderNames.get(app)) == null) { // first assign name to the appender if ((name = app.getName()) == null || isGenAppName(name)) { name = genAppName(); } appenderNames.put(app, name); printOptions(out, app, "log4j.appender."+name); if (app.getLayout() != null) { printOptions(out, app.getLayout(), "log4j.appender."+name+".layout"); } } appenderString += ", " + name; } String catKey = (cat == Logger.getRootLogger()) ? "log4j.rootLogger" : "log4j.logger." + cat.getName(); if (appenderString != "") { out.println(catKey + "=" + appenderString); } if (!cat.getAdditivity() && cat != Logger.getRootLogger()) { out.println("log4j.additivity." + cat.getName() + "=false"); } } protected void printOptions(PrintWriter out, Logger cat) { printOptions(out, (Category) cat); } protected void printOptions(PrintWriter out, Object obj, String fullname) { out.println(fullname + "=" + obj.getClass().getName()); PropertyGetter.getProperties(obj, this, fullname + "."); } public void foundProperty(Object obj, String prefix, String name, Object value) { // XXX: Properties encode value.toString() if (obj instanceof Appender && "name".equals(name)) { return; } if (doCapitalize) { name = capitalize(name); } out.println(prefix + name + "=" + value.toString()); } public static String capitalize(String name) { if (Character.isLowerCase(name.charAt(0))) { if (name.length() == 1 || Character.isLowerCase(name.charAt(1))) { StringBuffer newname = new StringBuffer(name); newname.setCharAt(0, Character.toUpperCase(name.charAt(0))); return newname.toString(); } } return name; } // for testing public static void main(String[] args) { new PropertyPrinter(new PrintWriter(System.out)); } }





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