Jetty example source code file (XmlParser.java)
The Jetty XmlParser.java source code// ========================================================================
// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.mortbay.xml;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Stack;
import java.util.StringTokenizer;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.mortbay.log.Log;
import org.mortbay.util.LazyList;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
/*--------------------------------------------------------------*/
/**
* XML Parser wrapper. This class wraps any standard JAXP1.1 parser with convieniant error and
* entity handlers and a mini dom-like document tree.
* <P>
* By default, the parser is created as a validating parser only if xerces is present. This can be
* configured by setting the "org.mortbay.xml.XmlParser.Validating" system property.
*
* @author Greg Wilkins (gregw)
*/
public class XmlParser
{
private Map _redirectMap = new HashMap();
private SAXParser _parser;
private Map _observerMap;
private Stack _observers = new Stack();
private String _xpath;
private Object _xpaths;
private String _dtd;
/* ------------------------------------------------------------ */
/**
* Construct
*/
public XmlParser()
{
SAXParserFactory factory = SAXParserFactory.newInstance();
boolean validating_dft = factory.getClass().toString().startsWith("org.apache.xerces.");
String validating_prop = System.getProperty("org.mortbay.xml.XmlParser.Validating", validating_dft ? "true" : "false");
boolean notValidating = Boolean.getBoolean("org.mortbay.xml.XmlParser.NotValidating"); // deprecated!
boolean validating = !notValidating && Boolean.valueOf(validating_prop).booleanValue();
setValidating(validating);
}
/* ------------------------------------------------------------ */
/**
* Constructor.
*/
public XmlParser(boolean validating)
{
setValidating(validating);
}
/* ------------------------------------------------------------ */
public void setValidating(boolean validating)
{
try
{
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setValidating(validating);
_parser = factory.newSAXParser();
try
{
if (validating)
_parser.getXMLReader().setFeature("http://apache.org/xml/features/validation/schema", validating);
}
catch (Exception e)
{
if (validating)
Log.warn("Schema validation may not be supported: ", e);
else
Log.ignore(e);
}
_parser.getXMLReader().setFeature("http://xml.org/sax/features/validation", validating);
_parser.getXMLReader().setFeature("http://xml.org/sax/features/namespaces", validating);
_parser.getXMLReader().setFeature("http://xml.org/sax/features/namespace-prefixes", validating); }
catch (Exception e)
{
Log.warn(Log.EXCEPTION, e);
throw new Error(e.toString());
}
}
/* ------------------------------------------------------------ */
/**
* @param name
* @param entity
*/
public synchronized void redirectEntity(String name, URL entity)
{
if (entity != null)
_redirectMap.put(name, entity);
}
/* ------------------------------------------------------------ */
/**
*
* @return Returns the xpath.
*/
public String getXpath()
{
return _xpath;
}
/* ------------------------------------------------------------ */
/**
* Set an XPath A very simple subset of xpath is supported to select a partial tree. Currently
* only path like "/node1/nodeA | /node1/nodeB" are supported.
*
* @param xpath The xpath to set.
*/
public void setXpath(String xpath)
{
_xpath = xpath;
StringTokenizer tok = new StringTokenizer(xpath, "| ");
while (tok.hasMoreTokens())
_xpaths = LazyList.add(_xpaths, tok.nextToken());
}
/* ------------------------------------------------------------ */
public String getDTD()
{
return _dtd;
}
/* ------------------------------------------------------------ */
/**
* Add a ContentHandler. Add an additional _content handler that is triggered on a tag name. SAX
* events are passed to the ContentHandler provided from a matching start element to the
* corresponding end element. Only a single _content handler can be registered against each tag.
*
* @param trigger Tag local or q name.
* @param observer SAX ContentHandler
*/
public synchronized void addContentHandler(String trigger, ContentHandler observer)
{
if (_observerMap == null)
_observerMap = new HashMap();
_observerMap.put(trigger, observer);
}
/* ------------------------------------------------------------ */
public synchronized Node parse(InputSource source) throws IOException, SAXException
{
_dtd=null;
Handler handler = new Handler();
XMLReader reader = _parser.getXMLReader();
reader.setContentHandler(handler);
reader.setErrorHandler(handler);
reader.setEntityResolver(handler);
if (Log.isDebugEnabled())
Log.debug("parsing: sid=" + source.getSystemId() + ",pid=" + source.getPublicId());
_parser.parse(source, handler);
if (handler._error != null)
throw handler._error;
Node doc = (Node) handler._top.get(0);
handler.clear();
return doc;
}
/* ------------------------------------------------------------ */
/**
* Parse String URL.
*/
public synchronized Node parse(String url) throws IOException, SAXException
{
if (Log.isDebugEnabled())
Log.debug("parse: " + url);
return parse(new InputSource(url));
}
/* ------------------------------------------------------------ */
/**
* Parse File.
*/
public synchronized Node parse(File file) throws IOException, SAXException
{
if (Log.isDebugEnabled())
Log.debug("parse: " + file);
return parse(new InputSource(file.toURL().toString()));
}
/* ------------------------------------------------------------ */
/**
* Parse InputStream.
*/
public synchronized Node parse(InputStream in) throws IOException, SAXException
{
_dtd=null;
Handler handler = new Handler();
XMLReader reader = _parser.getXMLReader();
reader.setContentHandler(handler);
reader.setErrorHandler(handler);
reader.setEntityResolver(handler);
_parser.parse(new InputSource(in), handler);
if (handler._error != null)
throw handler._error;
Node doc = (Node) handler._top.get(0);
handler.clear();
return doc;
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
private class NoopHandler extends DefaultHandler
{
Handler _next;
int _depth;
NoopHandler(Handler next)
{
this._next = next;
}
/* ------------------------------------------------------------ */
public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException
{
_depth++;
}
/* ------------------------------------------------------------ */
public void endElement(String uri, String localName, String qName) throws SAXException
{
if (_depth == 0)
_parser.getXMLReader().setContentHandler(_next);
else
_depth--;
}
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
private class Handler extends DefaultHandler
{
Node _top = new Node(null, null, null);
SAXParseException _error;
private Node _context = _top;
private NoopHandler _noop;
Handler()
{
_noop = new NoopHandler(this);
}
/* ------------------------------------------------------------ */
void clear()
{
_top = null;
_error = null;
_context = null;
}
/* ------------------------------------------------------------ */
public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException
{
String name = (uri == null || uri.equals("")) ? qName : localName;
Node node = new Node(_context, name, attrs);
// check if the node matches any xpaths set?
if (_xpaths != null)
{
String path = node.getPath();
boolean match = false;
for (int i = LazyList.size(_xpaths); !match && i-- > 0;)
{
String xpath = (String) LazyList.get(_xpaths, i);
match = path.equals(xpath) || xpath.startsWith(path) && xpath.length() > path.length() && xpath.charAt(path.length()) == '/';
}
if (match)
{
_context.add(node);
_context = node;
}
else
{
_parser.getXMLReader().setContentHandler(_noop);
}
}
else
{
_context.add(node);
_context = node;
}
ContentHandler observer = null;
if (_observerMap != null)
observer = (ContentHandler) _observerMap.get(name);
_observers.push(observer);
for (int i = 0; i < _observers.size(); i++)
if (_observers.get(i) != null)
((ContentHandler) _observers.get(i)).startElement(uri, localName, qName, attrs);
}
/* ------------------------------------------------------------ */
public void endElement(String uri, String localName, String qName) throws SAXException
{
_context = _context._parent;
for (int i = 0; i < _observers.size(); i++)
if (_observers.get(i) != null)
((ContentHandler) _observers.get(i)).endElement(uri, localName, qName);
_observers.pop();
}
/* ------------------------------------------------------------ */
public void ignorableWhitespace(char buf[], int offset, int len) throws SAXException
{
for (int i = 0; i < _observers.size(); i++)
if (_observers.get(i) != null)
((ContentHandler) _observers.get(i)).ignorableWhitespace(buf, offset, len);
}
/* ------------------------------------------------------------ */
public void characters(char buf[], int offset, int len) throws SAXException
{
_context.add(new String(buf, offset, len));
for (int i = 0; i < _observers.size(); i++)
if (_observers.get(i) != null)
((ContentHandler) _observers.get(i)).characters(buf, offset, len);
}
/* ------------------------------------------------------------ */
public void warning(SAXParseException ex)
{
Log.debug(Log.EXCEPTION, ex);
Log.warn("WARNING@" + getLocationString(ex) + " : " + ex.toString());
}
/* ------------------------------------------------------------ */
public void error(SAXParseException ex) throws SAXException
{
// Save error and continue to report other errors
if (_error == null)
_error = ex;
Log.debug(Log.EXCEPTION, ex);
Log.warn("ERROR@" + getLocationString(ex) + " : " + ex.toString());
}
/* ------------------------------------------------------------ */
public void fatalError(SAXParseException ex) throws SAXException
{
_error = ex;
Log.debug(Log.EXCEPTION, ex);
Log.warn("FATAL@" + getLocationString(ex) + " : " + ex.toString());
throw ex;
}
/* ------------------------------------------------------------ */
private String getLocationString(SAXParseException ex)
{
return ex.getSystemId() + " line:" + ex.getLineNumber() + " col:" + ex.getColumnNumber();
}
/* ------------------------------------------------------------ */
public InputSource resolveEntity(String pid, String sid)
{
if (Log.isDebugEnabled())
Log.debug("resolveEntity(" + pid + ", " + sid + ")");
if (sid!=null && sid.endsWith(".dtd"))
_dtd=sid;
URL entity = null;
if (pid != null)
entity = (URL) _redirectMap.get(pid);
if (entity == null)
entity = (URL) _redirectMap.get(sid);
if (entity == null)
{
String dtd = sid;
if (dtd.lastIndexOf('/') >= 0)
dtd = dtd.substring(dtd.lastIndexOf('/') + 1);
if (Log.isDebugEnabled())
Log.debug("Can't exact match entity in redirect map, trying " + dtd);
entity = (URL) _redirectMap.get(dtd);
}
if (entity != null)
{
try
{
InputStream in = entity.openStream();
if (Log.isDebugEnabled())
Log.debug("Redirected entity " + sid + " --> " + entity);
InputSource is = new InputSource(in);
is.setSystemId(sid);
return is;
}
catch (IOException e)
{
Log.ignore(e);
}
}
return null;
}
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
/**
* XML Attribute.
*/
public static class Attribute
{
private String _name;
private String _value;
Attribute(String n, String v)
{
_name = n;
_value = v;
}
public String getName()
{
return _name;
}
public String getValue()
{
return _value;
}
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
/**
* XML Node. Represents an XML element with optional attributes and ordered content.
*/
public static class Node extends AbstractList
{
Node _parent;
private ArrayList _list;
private String _tag;
private Attribute[] _attrs;
private boolean _lastString = false;
private String _path;
/* ------------------------------------------------------------ */
Node(Node parent, String tag, Attributes attrs)
{
_parent = parent;
_tag = tag;
if (attrs != null)
{
_attrs = new Attribute[attrs.getLength()];
for (int i = 0; i < attrs.getLength(); i++)
{
String name = attrs.getLocalName(i);
if (name == null || name.equals(""))
name = attrs.getQName(i);
_attrs[i] = new Attribute(name, attrs.getValue(i));
}
}
}
/* ------------------------------------------------------------ */
public Node getParent()
{
return _parent;
}
/* ------------------------------------------------------------ */
public String getTag()
{
return _tag;
}
/* ------------------------------------------------------------ */
public String getPath()
{
if (_path == null)
{
if (getParent() != null && getParent().getTag() != null)
_path = getParent().getPath() + "/" + _tag;
else
_path = "/" + _tag;
}
return _path;
}
/* ------------------------------------------------------------ */
/**
* Get an array of element attributes.
*/
public Attribute[] getAttributes()
{
return _attrs;
}
/* ------------------------------------------------------------ */
/**
* Get an element attribute.
*
* @return attribute or null.
*/
public String getAttribute(String name)
{
return getAttribute(name, null);
}
/* ------------------------------------------------------------ */
/**
* Get an element attribute.
*
* @return attribute or null.
*/
public String getAttribute(String name, String dft)
{
if (_attrs == null || name == null)
return dft;
for (int i = 0; i < _attrs.length; i++)
if (name.equals(_attrs[i].getName()))
return _attrs[i].getValue();
return dft;
}
/* ------------------------------------------------------------ */
/**
* Get the number of children nodes.
*/
public int size()
{
if (_list != null)
return _list.size();
return 0;
}
/* ------------------------------------------------------------ */
/**
* Get the ith child node or content.
*
* @return Node or String.
*/
public Object get(int i)
{
if (_list != null)
return _list.get(i);
return null;
}
/* ------------------------------------------------------------ */
/**
* Get the first child node with the tag.
*
* @param tag
* @return Node or null.
*/
public Node get(String tag)
{
if (_list != null)
{
for (int i = 0; i < _list.size(); i++)
{
Object o = _list.get(i);
if (o instanceof Node)
{
Node n = (Node) o;
if (tag.equals(n._tag))
return n;
}
}
}
return null;
}
/* ------------------------------------------------------------ */
public void add(int i, Object o)
{
if (_list == null)
_list = new ArrayList();
if (o instanceof String)
{
if (_lastString)
{
int last = _list.size() - 1;
_list.set(last, (String) _list.get(last) + o);
}
else
_list.add(i, o);
_lastString = true;
}
else
{
_lastString = false;
_list.add(i, o);
}
}
/* ------------------------------------------------------------ */
public void clear()
{
if (_list != null)
_list.clear();
_list = null;
}
/* ------------------------------------------------------------ */
/**
* Get a tag as a string.
*
* @param tag The tag to get
* @param tags IF true, tags are included in the value.
* @param trim If true, trim the value.
* @return results of get(tag).toString(tags).
*/
public String getString(String tag, boolean tags, boolean trim)
{
Node node = get(tag);
if (node == null)
return null;
String s = node.toString(tags);
if (s != null && trim)
s = s.trim();
return s;
}
/* ------------------------------------------------------------ */
public synchronized String toString()
{
return toString(true);
}
/* ------------------------------------------------------------ */
/**
* Convert to a string.
*
* @param tag If false, only _content is shown.
*/
public synchronized String toString(boolean tag)
{
StringBuffer buf = new StringBuffer();
synchronized (buf)
{
toString(buf, tag);
return buf.toString();
}
}
/* ------------------------------------------------------------ */
/**
* Convert to a string.
*
* @param tag If false, only _content is shown.
*/
public synchronized String toString(boolean tag, boolean trim)
{
String s = toString(tag);
if (s != null && trim)
s = s.trim();
return s;
}
/* ------------------------------------------------------------ */
private synchronized void toString(StringBuffer buf, boolean tag)
{
if (tag)
{
buf.append("<");
buf.append(_tag);
if (_attrs != null)
{
for (int i = 0; i < _attrs.length; i++)
{
buf.append(' ');
buf.append(_attrs[i].getName());
buf.append("=\"");
buf.append(_attrs[i].getValue());
buf.append("\"");
}
}
}
if (_list != null)
{
if (tag)
buf.append(">");
for (int i = 0; i < _list.size(); i++)
{
Object o = _list.get(i);
if (o == null)
continue;
if (o instanceof Node)
((Node) o).toString(buf, tag);
else
buf.append(o.toString());
}
if (tag)
{
buf.append("</");
buf.append(_tag);
buf.append(">");
}
}
else if (tag)
buf.append("/>");
}
/* ------------------------------------------------------------ */
/**
* Iterator over named child nodes.
*
* @param tag The tag of the nodes.
* @return Iterator over all child nodes with the specified tag.
*/
public Iterator iterator(final String tag)
{
return new Iterator()
{
int c = 0;
Node _node;
/* -------------------------------------------------- */
public boolean hasNext()
{
if (_node != null)
return true;
while (_list != null && c < _list.size())
{
Object o = _list.get(c);
if (o instanceof Node)
{
Node n = (Node) o;
if (tag.equals(n._tag))
{
_node = n;
return true;
}
}
c++;
}
return false;
}
/* -------------------------------------------------- */
public Object next()
{
try
{
if (hasNext())
return _node;
throw new NoSuchElementException();
}
finally
{
_node = null;
c++;
}
}
/* -------------------------------------------------- */
public void remove()
{
throw new UnsupportedOperationException("Not supported");
}
};
}
}
}
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