+/*
+ * 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.
+ *
+ * <p>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));
+ }
+}