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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/xml/transform/XSLURIResolver.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/transform/XSLURIResolver.java')
-rw-r--r-- | libjava/classpath/gnu/xml/transform/XSLURIResolver.java | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/transform/XSLURIResolver.java b/libjava/classpath/gnu/xml/transform/XSLURIResolver.java new file mode 100644 index 000000000..cf596c1e6 --- /dev/null +++ b/libjava/classpath/gnu/xml/transform/XSLURIResolver.java @@ -0,0 +1,321 @@ +/* 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.sax.SAXSource; +import javax.xml.transform.stream.StreamSource; +import org.w3c.dom.Document; +import org.w3c.dom.Node; +import org.xml.sax.InputSource; +import org.xml.sax.SAXException; +import org.xml.sax.XMLReader; +import gnu.xml.dom.DomDocument; +import gnu.xml.dom.ls.SAXEventSink; +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 +{ + + final Map<String,Long> lastModifiedCache = new HashMap<String,Long>(); + final Map<String,Node> nodeCache = new HashMap<String,Node>(); + 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 + { + Node node = null; + InputStream in = null; + if (source != null && source instanceof StreamSource) + { + StreamSource ss = (StreamSource) source; + in = ss.getInputStream(); + if (in == null) + { + Reader reader = ss.getReader(); + if (reader != null) + { + in = new ReaderInputStream(reader); + } + } + } + else if (source != null && source instanceof SAXSource) + { + SAXSource ss = (SAXSource) source; + InputSource input = ss.getInputSource(); + if (input != null) + { + if (systemId == null) + systemId = input.getSystemId(); + XMLReader reader = ss.getXMLReader(); + if (reader != null) + return parse(input, reader); + } + } + if (in == null) + { + URL url = resolveURL(systemId, base, href); + if (url != null) + { + systemId = url.toString(); + node = nodeCache.get(systemId); + // Is the resource up to date? + URLConnection conn = url.openConnection(); + Long llm = 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); + } + } + + DOMSource parse(InputSource source, XMLReader reader) + throws SAXException, IOException + { + SAXEventSink eventSink = new SAXEventSink(); + eventSink.setReader(reader); + eventSink.setNamespaceAware(true); + reader.setContentHandler(eventSink); + reader.setDTDHandler(eventSink); + reader.setProperty("http://xml.org/sax/properties/lexical-handler", + eventSink); + reader.setProperty("http://xml.org/sax/properties/declaration-handler", + eventSink); + // XXX entityResolver + // XXX errorHandler + reader.parse(source); + Document doc = eventSink.getDocument(); + String systemId = source.getSystemId(); + if (systemId != null && doc instanceof DomDocument) + ((DomDocument) doc).setDocumentURI(systemId); + return new DOMSource(doc, systemId); + } + +} |