/*
* Copyright 2000-2004 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.jetspeed.portal.portlets;
//Element Construction Set
import org.apache.ecs.ConcreteElement;
import org.apache.ecs.StringElement;
//Jetspeed stuff
import org.apache.jetspeed.portal.PortletConfig;
import org.apache.jetspeed.portal.PortletException;
import org.apache.jetspeed.util.JetspeedClearElement;
import org.apache.jetspeed.util.MimeType;
import org.apache.jetspeed.cache.disk.JetspeedDiskCache;
import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
import org.apache.jetspeed.services.logging.JetspeedLogger;
//turbine
import org.apache.turbine.util.RunData;
//standard java stuff
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import org.xml.sax.AttributeList;
import org.xml.sax.HandlerBase;
import org.xml.sax.Parser;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.ParserFactory;
/**
* This portlet serves well-formed WML file content and strips
* them of superfluous tags liks <wml>
*
* <strong>The strip capability has been temporarily disabled due to
* class conflicts in Tomcat 3.2, so this portlet can only currently
* serve fragments of WML documents, without the <wml> tag</strong>
*
* @author <a href="mailto:raphael@apache.org">Rapha�l Luta</a>
* @version $Id: WMLFilePortlet.java,v 1.11 2004/02/23 04:03:33 jford Exp $
*/
public class WMLFilePortlet extends FileWatchPortlet
{
/**
* Static initialization of the logger for this class
*/
private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(WMLFilePortlet.class.getName());
private ConcreteElement content = new StringElement("Not available");
/**
* @see Portlet#supportsType
*/
public boolean supportsType( MimeType type ) {
return type.equals(MimeType.WML);
}
/** Initialize the content of the portlet
*/
public void init() throws PortletException {
PortletConfig config = this.getPortletConfig();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
// RL: disable the SAX filter due to a class path problem
// with Tomcat 3.2
/*
String url = JetspeedDiskCache.getInstance().getEntry( config.getURL() ).getURL();
WMLFilter myFilter = new WMLFilter(new PrintWriter(bos));
myFilter.filter(url);
content = new JetspeedClearElement( bos.toString() );
*/
content = new JetspeedClearElement(
JetspeedDiskCache.getInstance().getEntry( config.getURL() ).getData() );
} catch (Exception e) {
throw new PortletException( e.getMessage() );
} finally {
try {
bos.close();
} catch (IOException e) {}
}
}
public ConcreteElement getContent( RunData data ) {
return content;
}
class WMLFilter extends HandlerBase {
private static final String DEFAULT_PARSER_NAME = "javax.xml.parsers.SAXParser";
protected PrintWriter out=new PrintWriter(System.out);
public WMLFilter(PrintWriter outPW) throws UnsupportedEncodingException {
this.out=outPW;
}
public void filter(String uri) {
try {
HandlerBase handler = this;
Parser parser = ParserFactory.makeParser(DEFAULT_PARSER_NAME);
parser.setDocumentHandler(handler);
parser.setErrorHandler(handler);
parser.parse(uri);
}
catch (Exception e) {
logger.error("Exception", e);
}
}
public void processingInstruction(String target, String data) {
//filter all PIs
}
public void startElement(String name, AttributeList attrs) {
// strip <wml>
if (name.equals("wml")) return;
// else output the element
out.print('<');
out.print(name);
if (attrs != null) {
int len = attrs.getLength();
for (int i = 0; i < len; i++) {
out.print(' ');
out.print(attrs.getName(i));
out.print("=\"");
out.print(normalize(attrs.getValue(i)));
out.print('"');
}
}
out.print('>');
}
public void characters(char ch[], int start, int length) {
out.print(normalize(new String(ch, start, length)));
}
public void ignorableWhitespace(char ch[], int start, int length) {
characters(ch, start, length);
}
public void endElement(String name) {
//filter <wml>
if (name.equals("wml")) return;
// outpu anything else
out.print("</");
out.print(name);
out.print('>');
}
public void endDocument() {
out.flush();
}
public void warning(SAXParseException ex) {
logger.info(getLocationString(ex)+": "+ex.getMessage());
}
public void error(SAXParseException ex) {
logger.error(getLocationString(ex)+": "+ex, ex);
}
public void fatalError(SAXParseException ex) throws SAXException {
logger.error(getLocationString(ex)+": "+ex, ex);
throw ex;
}
/**
Retrieves the error location in the input stream
*/
private String getLocationString(SAXParseException ex) {
StringBuffer str = new StringBuffer();
String systemId = ex.getSystemId();
if (systemId != null) {
int index = systemId.lastIndexOf('/');
if (index != -1)
systemId = systemId.substring(index + 1);
str.append(systemId);
}
str.append(':');
str.append(ex.getLineNumber());
str.append(':');
str.append(ex.getColumnNumber());
return str.toString();
}
/**
Escapes characters data
*/
protected String normalize(String s) {
StringBuffer str = new StringBuffer();
int len = (s != null) ? s.length() : 0;
for (int i = 0; i < len; i++) {
char ch = s.charAt(i);
switch (ch) {
case '<': {
str.append("<");
break;
}
case '>': {
str.append(">");
break;
}
case '&': {
str.append("&");
break;
}
case '"': {
str.append(""");
break;
}
default: {
str.append(ch);
}
}
}
return str.toString();
}
}
}