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18 package org.apache.log4j.xml;
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20 import org.apache.log4j.helpers.LogLog;
21 import org.xml.sax.EntityResolver;
22 import org.xml.sax.InputSource;
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24 import java.io.InputStream;
25 import java.io.ByteArrayInputStream;
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34 public class Log4jEntityResolver implements EntityResolver {
35 private static final String PUBLIC_ID = "-//APACHE//DTD LOG4J 1.2//EN";
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37 public InputSource resolveEntity (String publicId, String systemId) {
38 if (systemId.endsWith("log4j.dtd") || PUBLIC_ID.equals(publicId)) {
39 Class clazz = getClass();
40 InputStream in = clazz.getResourceAsStream("/org/apache/log4j/xml/log4j.dtd");
41 if (in == null) {
42 LogLog.warn("Could not find [log4j.dtd] using [" + clazz.getClassLoader()
43 + "] class loader, parsed without DTD.");
44 in = new ByteArrayInputStream(new byte[0]);
45 }
46 return new InputSource(in);
47 } else {
48 return null;
49 }
50 }
51 }