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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/pipeline/XsltFilter.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/pipeline/XsltFilter.java')
-rw-r--r-- | libjava/classpath/gnu/xml/pipeline/XsltFilter.java | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/pipeline/XsltFilter.java b/libjava/classpath/gnu/xml/pipeline/XsltFilter.java new file mode 100644 index 000000000..86b6190c5 --- /dev/null +++ b/libjava/classpath/gnu/xml/pipeline/XsltFilter.java @@ -0,0 +1,130 @@ +/* XsltFilter.java -- + Copyright (C) 2001 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.pipeline; + +import java.io.IOException; + +import javax.xml.transform.TransformerFactory; +import javax.xml.transform.TransformerConfigurationException; +import javax.xml.transform.sax.*; +import javax.xml.transform.stream.StreamSource; + +import org.xml.sax.SAXException; +import org.xml.sax.ext.LexicalHandler; + + +/** + * Packages an XSLT transform as a pipeline component. + * Note that all DTD events (callbacks to DeclHandler and DTDHandler + * interfaces) are discarded, although XSLT transforms may be set up to + * use the LexicalHandler to write DTDs with only an external subset. + * Not every XSLT engine will necessarily be usable with this filter, + * but current versions of + * <a href="http://saxon.sourceforge.net">SAXON</a> and + * <a href="http://xml.apache.org/xalan-j">Xalan</a> should work well. + * + * @see TransformerFactory + * + * @author David Brownell + */ +final public class XsltFilter extends EventFilter +{ + /** + * Creates a filter that performs the specified transform. + * Uses the JAXP 1.1 interfaces to access the default XSLT + * engine configured for in the current execution context, + * and parses the stylesheet without custom EntityResolver + * or ErrorHandler support. + * + * @param stylesheet URI for the stylesheet specifying the + * XSLT transform + * @param next provides the ContentHandler and LexicalHandler + * to receive XSLT output. + * @exception SAXException if the stylesheet can't be parsed + * @exception IOException if there are difficulties + * bootstrapping the XSLT engine, such as it not supporting + * SAX well enough to use this way. + */ + public XsltFilter (String stylesheet, EventConsumer next) + throws SAXException, IOException + { + // First, get a transformer with the stylesheet preloaded + TransformerFactory tf = null; + TransformerHandler th; + + try { + SAXTransformerFactory stf; + + tf = TransformerFactory.newInstance (); + if (!tf.getFeature (SAXTransformerFactory.FEATURE) // sax inputs + || !tf.getFeature (SAXResult.FEATURE) // sax outputs + || !tf.getFeature (StreamSource.FEATURE) // stylesheet + ) + throw new IOException ("XSLT factory (" + + tf.getClass ().getName () + + ") does not support SAX"); + stf = (SAXTransformerFactory) tf; + th = stf.newTransformerHandler (new StreamSource (stylesheet)); + } catch (TransformerConfigurationException e) { + throw new IOException ("XSLT factory (" + + (tf == null + ? "none available" + : tf.getClass ().getName ()) + + ") configuration error, " + + e.getMessage () + ); + } + + // Hook its outputs up to the pipeline ... + SAXResult out = new SAXResult (); + + out.setHandler (next.getContentHandler ()); + try { + LexicalHandler lh; + lh = (LexicalHandler) next.getProperty (LEXICAL_HANDLER); + out.setLexicalHandler (lh); + } catch (Exception e) { + // ignore + } + th.setResult (out); + + // ... and make sure its inputs look like ours. + setContentHandler (th); + setProperty (LEXICAL_HANDLER, th); + } +} |