--- /dev/null
+/* 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);
+ }
+ }
+
+}
+
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