/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file. */
package org.apache.log4j.xml;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.apache.log4j.helpers.LogLog;
/**
* 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 {
public InputSource resolveEntity (String publicId, String systemId) {
if (systemId.endsWith("log4j.dtd")) {
Class clazz = getClass();
InputStream in = clazz.getResourceAsStream("/org/apache/log4j/xml/log4j.dtd");
if (in == null) {
LogLog.error("Could not find [log4j.dtd]. Used [" + clazz.getClassLoader()
+ "] class loader in the search.");
return null;
} else {
return new InputSource(in);
}
} else {
return null;
}
}
}
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