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/*
* 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.jasper.compiler;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletContext;
import org.apache.jasper.Constants;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.xml.sax.InputSource;
/**
* Provides Jasper with a standard mechanism for gaining access to the web.xml
* file associated with the current application. This isn't as simple as looking
* in /WEB-INF/web.xml. In embedded scenarios, an alternative web.xml may be
* provided and in Servlet 3.0 / JSP 2.2 environments an application's web.xml
* may be the result of merging a number of web-fragment.xml files and/or
* annotations with the main web.xml
*
* Clients *must* ensure that they call {@link #close()} to clean up resources.
*/
public class WebXml {
private static final String FILE_PROTOCOL = "file:";
private static final String WEB_XML = "/WEB-INF/web.xml";
private final Log log = LogFactory.getLog(WebXml.class);
private InputStream stream;
private InputSource source;
private String systemId;
public WebXml(ServletContext ctxt) throws IOException {
// Is a web.xml provided as context attribute?
String webXml = (String) ctxt.getAttribute(
org.apache.tomcat.util.scan.Constants.MERGED_WEB_XML);
if (webXml != null) {
source = new InputSource(new StringReader(webXml));
systemId = org.apache.tomcat.util.scan.Constants.MERGED_WEB_XML;
}
// If not available as context attribute, look for an alternative
// location
if (source == null) {
// Acquire input stream to web application deployment descriptor
String altDDName = (String)ctxt.getAttribute(
Constants.ALT_DD_ATTR);
if (altDDName != null) {
try {
URL uri =
new URL(FILE_PROTOCOL+altDDName.replace('\\', '/'));
stream = uri.openStream();
source = new InputSource(stream);
systemId = uri.toExternalForm();
} catch (MalformedURLException e) {
log.warn(Localizer.getMessage(
"jsp.error.internal.filenotfound",
altDDName));
}
}
}
// Finally, try the default /WEB-INF/web.xml
if (source == null) {
URL uri = ctxt.getResource(WEB_XML);
if (uri == null) {
log.warn(Localizer.getMessage(
"jsp.error.internal.filenotfound", WEB_XML));
} else {
stream = uri.openStream();
source = new InputSource(stream);
systemId = uri.toExternalForm();
}
}
if (source == null) {
systemId = null;
} else {
source.setSystemId(systemId);
}
}
public String getSystemId() {
return systemId;
}
public InputSource getInputSource() {
return source;
}
public void close() {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
log.error(Localizer.getMessage(
"jsp.error.stream.close.failed"));
}
}
}
}
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