| /* XSLURIResolver.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.xml.transform; |
| |
| import java.io.File; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import javax.xml.parsers.DocumentBuilder; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.transform.ErrorListener; |
| import javax.xml.transform.Source; |
| import javax.xml.transform.TransformerException; |
| import javax.xml.transform.URIResolver; |
| import javax.xml.transform.dom.DOMSource; |
| import javax.xml.transform.stream.StreamSource; |
| import org.w3c.dom.Node; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| import gnu.xml.dom.ls.ReaderInputStream; |
| |
| /** |
| * URI resolver for XSLT. |
| * This resolver parses external entities into DOMSources. It |
| * maintains a cache of URIs to DOMSources to avoid expensive re-parsing. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| class XSLURIResolver |
| implements URIResolver |
| { |
| |
| Map lastModifiedCache = new HashMap(); |
| Map nodeCache = new HashMap(); |
| DocumentBuilder builder; |
| URIResolver userResolver; |
| ErrorListener userListener; |
| |
| void setUserResolver(URIResolver userResolver) |
| { |
| this.userResolver = userResolver; |
| } |
| |
| void setUserListener(ErrorListener userListener) |
| { |
| this.userListener = userListener; |
| } |
| |
| /** |
| * Clear the cache. |
| */ |
| void flush() |
| { |
| lastModifiedCache.clear(); |
| nodeCache.clear(); |
| } |
| |
| public Source resolve(String href, String base) |
| throws TransformerException |
| { |
| Source source = null; |
| if (userResolver != null) |
| { |
| source = userResolver.resolve(base, href); |
| } |
| return resolveDOM(source, href, base); |
| } |
| |
| DOMSource resolveDOM(Source source, String base, String href) |
| throws TransformerException |
| { |
| if (source != null && source instanceof DOMSource) |
| { |
| return (DOMSource) source; |
| } |
| String systemId = (source == null) ? null : source.getSystemId(); |
| long lastModified = 0L, lastLastModified = 0L; |
| |
| try |
| { |
| URL url = resolveURL(systemId, base, href); |
| Node node = null; |
| InputStream in = null; |
| if (source instanceof StreamSource) |
| { |
| StreamSource ss = (StreamSource) source; |
| in = ss.getInputStream(); |
| if (in == null) |
| { |
| Reader reader = ss.getReader(); |
| if (reader != null) |
| { |
| in = new ReaderInputStream(reader); |
| } |
| } |
| } |
| if (in == null) |
| { |
| if (url != null) |
| { |
| systemId = url.toString(); |
| node = (Node) nodeCache.get(systemId); |
| // Is the resource up to date? |
| URLConnection conn = url.openConnection(); |
| Long llm = (Long) lastModifiedCache.get(systemId); |
| if (llm != null) |
| { |
| lastLastModified = llm.longValue(); |
| conn.setIfModifiedSince(lastLastModified); |
| } |
| conn.connect(); |
| lastModified = conn.getLastModified(); |
| if (node != null && |
| lastModified > 0L && |
| lastModified <= lastLastModified) |
| { |
| // Resource unchanged |
| return new DOMSource(node, systemId); |
| } |
| else |
| { |
| // Resource new or modified |
| in = conn.getInputStream(); |
| nodeCache.put(systemId, node); |
| lastModifiedCache.put(systemId, new Long(lastModified)); |
| } |
| } |
| else |
| { |
| throw new TransformerException("can't resolve URL: " + |
| systemId); |
| } |
| } |
| InputSource input = new InputSource(in); |
| input.setSystemId(systemId); |
| DocumentBuilder builder = getDocumentBuilder(); |
| node = builder.parse(input); |
| return new DOMSource(node, systemId); |
| } |
| catch (IOException e) |
| { |
| throw new TransformerException(e); |
| } |
| catch (SAXException e) |
| { |
| throw new TransformerException(e); |
| } |
| } |
| |
| URL resolveURL(String systemId, String base, String href) |
| throws IOException |
| { |
| URL url = null; |
| try |
| { |
| if (systemId != null) |
| { |
| try |
| { |
| url = new URL(systemId); |
| } |
| catch (MalformedURLException e) |
| { |
| // Try building from base + href |
| } |
| } |
| if (url == null) |
| { |
| if (base != null) |
| { |
| URL baseURL = new URL(base); |
| url = new URL(baseURL, href); |
| } |
| else if (href != null) |
| { |
| url = new URL(href); |
| } |
| else |
| { |
| // See below |
| throw new MalformedURLException(systemId); |
| } |
| } |
| return url; |
| } |
| catch (MalformedURLException e) |
| { |
| // Fall back to local filesystem |
| File file = null; |
| if (href == null) |
| { |
| href = systemId; |
| } |
| if (base != null) |
| { |
| int lsi = base.lastIndexOf(File.separatorChar); |
| if (lsi != -1 && lsi < base.length() - 1) |
| { |
| base = base.substring(0, lsi); |
| } |
| File baseFile = new File(base); |
| file = new File(baseFile, href); |
| } |
| else if (href != null) |
| { |
| file = new File(href); |
| } |
| return (file == null) ? null : file.toURL(); |
| } |
| } |
| |
| DocumentBuilder getDocumentBuilder() |
| throws TransformerException |
| { |
| try |
| { |
| if (builder == null) |
| { |
| DocumentBuilderFactory factory = |
| DocumentBuilderFactory.newInstance(); |
| factory.setNamespaceAware(true); |
| factory.setExpandEntityReferences(true); |
| builder = factory.newDocumentBuilder(); |
| } |
| if (userResolver != null) |
| { |
| builder.setEntityResolver(new URIResolverEntityResolver(userResolver)); |
| } |
| if (userListener != null) |
| { |
| builder.setErrorHandler(new ErrorListenerErrorHandler(userListener)); |
| } |
| return builder; |
| } |
| catch (Exception e) |
| { |
| throw new TransformerException(e); |
| } |
| } |
| |
| } |
| |