| /* |
| * 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.xml; |
| |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.InputSource; |
| |
| import java.io.InputStream; |
| import java.io.ByteArrayInputStream; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| |
| /** |
| * An {@link EntityResolver} specifically designed to return |
| * <code>log4j.dtd</code> which is embedded within the log4j jar |
| * file. |
| * |
| * @author Paul Austin |
| * */ |
| public class Log4jEntityResolver implements EntityResolver { |
| private static final String PUBLIC_ID = "-//APACHE//DTD LOG4J 1.2//EN"; |
| private static final Logger logger = LogManager.getLogger(); |
| |
| public InputSource resolveEntity (String publicId, String systemId) { |
| if (systemId.endsWith("log4j.dtd") || PUBLIC_ID.equals(publicId)) { |
| Class clazz = getClass(); |
| InputStream in = clazz.getResourceAsStream("/org/apache/log4j/xml/log4j.dtd"); |
| if (in == null) { |
| logger.warn("Could not find [log4j.dtd] using [" + clazz.getClassLoader() |
| + "] class loader, parsed without DTD."); |
| in = new ByteArrayInputStream(new byte[0]); |
| } |
| return new InputSource(in); |
| } else { |
| return null; |
| } |
| } |
| } |