/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.Constants;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import java.io.InputStream;
/**
* An {@link EntityResolver} specifically designed to return
* <code>log4j.dtd</code> which is embedded within the log4j jar
* file.
*
* @author Paul Austin
* @author Ceki Gulcu (adapted for log4j)
* */
public class Log4jEntityResolver implements EntityResolver {
public InputSource resolveEntity(String publicId, String systemId) {
Logger logger = LogManager.getLogger(Log4jEntityResolver.class);
logger.debug(
"Log4jEntityResolver.resolveEntity({}, {}) called", publicId, systemId);
if (systemId.endsWith("log4j.dtd")) {
logger.warn("The 'log4j.dtd' is no longer used nor needed.");
logger.warn("See {}#log4j_dtd for more details.", Constants.CODES_HREF);
Class clazz = getClass();
InputStream in =
clazz.getResourceAsStream("/org/apache/log4j/xml/log4j.dtd");
if (in == null) {
logger.error(
"Could not find [log4j.dtd]. Used [{}] class loader in the search.",
clazz.getClassLoader());
return null;
} else {
return new InputSource(in);
}
} else {
return null;
}
}
}