org.apache.jasper.xmlparser.ParserUtils Maven / Gradle / Ivy
/*
* 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.jasper.xmlparser;
import java.io.InputStream;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.jasper.Constants;
import org.apache.jasper.JasperException;
import org.apache.jasper.logging.Logger;
import org.w3c.dom.Comment;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* XML parsing utilities for processing web application deployment
* descriptor and tag library descriptor files. FIXME - make these
* use a separate class loader for the parser to be used.
*
* @author Craig R. McClanahan
* @version $Revision: 1.3.2.3 $ $Date: 2004/08/25 20:56:17 $
*/
public class ParserUtils {
// ----------------------------------------------------- Instance Variables
/**
* The class loader to use for accessing our XML parser.
*/
protected ClassLoader classLoader = null;
/**
* An error handler for use when parsing XML documents.
*/
static ErrorHandler errorHandler = new MyErrorHandler();
/**
* An entity resolver for use when parsing XML documents.
*/
static EntityResolver entityResolver = new MyEntityResolver();
public static boolean validating=true;
// --------------------------------------------------------- Public Methods
/**
* Return the class loader used to access our XML parser.
*/
// public ClassLoader getClassLoader() {
// return (this.classLoader);
// }
/**
* Parse the specified XML document, and return a TreeNode
* that corresponds to the root node of the document tree.
*
* @param uri URI of the XML document being parsed
* @param is Input stream containing the deployment descriptor
*
* @exception JasperException if an input/output error occurs
* @exception JasperException if a parsing error occurs
*/
public TreeNode parseXMLDocument(String uri, InputStream is)
throws JasperException {
Document document = null;
// Perform an XML parse of this document, via JAXP
try {
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
/*
Class clazz =
classLoader.loadClass("javax.xml.parsers.DocumentBuilderFactory");
System.out.println("Loaded DBF from:");
System.out.println(clazz.getClassLoader());
Method method = clazz.getMethod("newInstance", new Class[0]);
DocumentBuilderFactory factory = (DocumentBuilderFactory)
method.invoke(null, new Object[0]);
*/
factory.setNamespaceAware(true);
factory.setValidating(validating);
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setEntityResolver(entityResolver);
builder.setErrorHandler(errorHandler);
document = builder.parse(is);
//System.out.println("Parsing " + uri );
/*
} catch (ClassNotFoundException ex) {
throw new JasperException("CNFE: " + ex); // FIXME
} catch (IllegalAccessException ex) {
throw new JasperException("IACE: " + ex); // FIXME
} catch (IllegalArgumentException ex) {
throw new JasperException("IARE: " + ex); // FIXME
} catch (InvocationTargetException ex) {
throw new JasperException("ITE: " + ex); // FIXME
} catch (NoSuchMethodException ex) {
throw new JasperException("NSME: " + ex); // FIXME
*/
} catch (ParserConfigurationException ex) {
throw new JasperException
(Constants.getString("jsp.error.parse.xml",
new Object[]{uri, ex.getMessage()}));
} catch (SAXParseException ex) {
throw new JasperException
(Constants.getString
("jsp.error.parse.xml.line",
new Object[]{uri,
new Integer(ex.getLineNumber()),
new Integer(ex.getColumnNumber()),
ex.getMessage()}));
} catch (SAXException sx) {
throw new JasperException
(Constants.getString("jsp.error.parse.xml",
new Object[]{uri, sx.getMessage()}));
} catch (IOException io) {
throw new JasperException
(Constants.getString("jsp.error.parse.xml",
new Object[]{uri, io.toString()}));
}
// Convert the resulting document to a graph of TreeNodes
return (convert(null, document.getDocumentElement()));
}
/**
* Set the class loader used to access our XML parser.
*
* @param classLoader The new class loader
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
// ------------------------------------------------------ Protected Methods
/**
* Create and return a TreeNode that corresponds to the specified Node,
* including processing all of the attributes and children nodes.
*
* @param parent The parent TreeNode (if any) for the new TreeNode
* @param node The XML document Node to be converted
*/
protected TreeNode convert(TreeNode parent, Node node) {
// Construct a new TreeNode for this node
TreeNode treeNode = new TreeNode(node.getNodeName(), parent);
// System.out.println("PU: " + node.getNodeName());
// Convert all attributes of this node
NamedNodeMap attributes = node.getAttributes();
if (attributes != null) {
int n = attributes.getLength();
for (int i = 0; i < n; i++) {
Node attribute = attributes.item(i);
treeNode.addAttribute(attribute.getNodeName(),
attribute.getNodeValue());
// System.out.println("PU: " +
// attribute.getNodeName() + "=" +
// attribute.getNodeValue());
}
}
// Create and attach all children of this node
NodeList children = node.getChildNodes();
if (children != null) {
int n = children.getLength();
for (int i = 0; i < n; i++) {
Node child = children.item(i);
if (child instanceof Comment)
continue;
if (child instanceof Text) {
String body = ((Text) child).getData();
if (body != null) {
body = body.trim();
if (body.length() > 0)
treeNode.setBody(body);
}
} else {
TreeNode treeChild = convert(treeNode, child);
}
}
}
// Return the completed TreeNode graph
return (treeNode);
}
// ------------------------------------------------------- Static Variables
/**
* The special class loaders for each web application's XML parser,
* keyed by the web application class loader instance. FIXME - this
* probably interferes with garbage collection after an application reload.
*/
// private static HashMap classLoaders = new HashMap();
// --------------------------------------------------------- Static Methods
/**
* Create (if necessary) and return an instance of ParserUtils that has
* been loaded by our subordinate class loader (and therefore should have
* access to the XML parser that is visible to repositories of that
* class loader).
*
* @param parentLoader The web application class loader
*/
public synchronized static ParserUtils createParserUtils
(ClassLoader parentLoader) {
ParserUtils parserUtils = null;
/*
try {
Class clazz = parentLoader.loadClass
("org.apache.jasper.xmlparser.ParserUtils");
parserUtils = (ParserUtils) clazz.newInstance();
System.out.println("ParserUtils loaded by ClassLoader:\r\n" +
parserUtils.getClass().getClassLoader());
parserUtils.setClassLoader(createClassLoader(parentLoader));
} catch (ClassNotFoundException e) {
System.out.println("createParserUtils: ClassNotFoundException");
e.printStackTrace(System.out);
} catch (IllegalAccessException e) {
System.out.println("createParserUtils: IllegalAccessException");
e.printStackTrace(System.out);
} catch (InstantiationException e) {
System.out.println("createParserUtils: InstantiationException");
e.printStackTrace(System.out);
} catch (MalformedURLException e) {
System.out.println("createParserUtils: MalformedURLException");
e.printStackTrace(System.out);
}
*/
parserUtils = new ParserUtils();
parserUtils.setClassLoader(parentLoader);
return (parserUtils);
}
/**
* Construct (if necessary) and return a class loader that has been
* configured with the specified parent class loader, and repositories
* as needed to access the required XML parser.
*
* @param parentLoader The web application class loader
*
* @exception MalformedURLException if we cannot create a valid URL for
* one of the required repositories
*/
/* This doesn't work.
public synchronized static ClassLoader createClassLoader
(ClassLoader parentLoader) throws MalformedURLException {
// Return any existing class loader for this web application
URLClassLoader classLoader = (URLClassLoader)
classLoaders.get(parentLoader);
if (classLoader != null)
return (classLoader);
// Construct, cache, and return a new class loader
URL urls[] = new URL[2]; // FIXME
urls[0] = new URL("file:///classes/jaxp.jar");
urls[1] = new URL("file:///classes/crimson.jar");
classLoader = new URLClassLoader(urls, parentLoader);
classLoaders.put(parentLoader, classLoader);
System.out.println("PUF: createClassLoader:\r\n" + classLoader);
urls = classLoader.getURLs();
for (int i = 0; i < urls.length; i++)
System.out.println("PUF: url=" + urls[i]);
return (classLoader);
}
*/
}
// ------------------------------------------------------------ Private Classes
class MyEntityResolver implements EntityResolver {
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException
{
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