com.icesoft.jasper.xmlparser.ParserUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of icefaces-compat Show documentation
Show all versions of icefaces-compat Show documentation
${icefaces.product.name} Compat Component Library
/*
* 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 com.icesoft.jasper.xmlparser;
import com.icesoft.jasper.JasperException;
import com.icesoft.jasper.compiler.Localizer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.SAXException;
import org.xml.sax.SAXParseException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStream;
/**
* 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: 1.10 $ $Date: 2004/03/17 19:23:05 $
*/
public class ParserUtils {
// Logger
static Log log = LogFactory.getLog(ParserUtils.class);
/**
* An error handler for use when parsing XML documents.
*/
static ErrorHandler errorHandler = new MyErrorHandler();
/**
* An entity resolver for use when parsing XML documents.
*/
public static EntityResolver entityResolver = new CachedEntityResolver();
// Turn off for JSP 2.0 until switch over to using xschema.
public static boolean validating = false;
// --------------------------------------------------------- Public Methods
/**
* 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
* @throws JasperException if an input/output error occurs
* @throws 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();
factory.setNamespaceAware(true);
factory.setValidating(validating);
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setEntityResolver(entityResolver);
builder.setErrorHandler(errorHandler);
document = builder.parse(is);
} catch (ParserConfigurationException ex) {
throw new JasperException
(Localizer.getMessage("jsp.error.parse.xml", uri), ex);
} catch (SAXParseException ex) {
throw new JasperException
(Localizer.getMessage("jsp.error.parse.xml.line",
uri,
Integer.toString(ex.getLineNumber()),
Integer.toString(
ex.getColumnNumber())),
ex);
} catch (SAXException sx) {
if (log.isErrorEnabled()) {
log.error( "XML parsing failed for " + uri +
"SAXException: " +sx.getMessage() );
}
throw new JasperException
(Localizer.getMessage("jsp.error.parse.xml", uri) +
"SAXException: " +sx.getMessage(), sx);
} catch (IOException io) {
throw new JasperException
(Localizer.getMessage("jsp.error.parse.xml", uri), io);
}
// Convert the resulting document to a graph of TreeNodes
return (convert(null, document.getDocumentElement()));
}
// ------------------------------------------------------ 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);
// 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());
}
}
// 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);
}
}
// ------------------------------------------------------------ Private Classes
/*
class MyEntityResolver implements EntityResolver {
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException
{
for (int i=0; i