| /* XMLJ.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.libxmlj.util; |
| |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| import javax.xml.transform.Result; |
| import javax.xml.transform.Source; |
| import javax.xml.transform.sax.SAXSource; |
| import javax.xml.transform.stream.StreamResult; |
| import javax.xml.transform.stream.StreamSource; |
| |
| import org.xml.sax.InputSource; |
| |
| import gnu.xml.libxmlj.transform.GnomeTransformerFactory; |
| |
| import gnu.xml.dom.ls.ReaderInputStream; |
| import gnu.xml.dom.ls.WriterOutputStream; |
| |
| /** |
| * Utility functions for libxmlj. |
| */ |
| public final class XMLJ |
| { |
| |
| static class XMLJShutdownHook |
| implements Runnable |
| { |
| |
| public void run () |
| { |
| // Make sure finalizers are run |
| System.gc (); |
| Runtime.getRuntime ().runFinalization (); |
| |
| // Perform global cleanup on the native level |
| GnomeTransformerFactory.freeLibxsltGlobal (); |
| } |
| |
| } |
| |
| private static boolean initialised = false; |
| |
| public static void init () |
| { |
| if (!initialised) |
| { |
| System.loadLibrary ("xmlj"); |
| |
| XMLJShutdownHook hook = new XMLJShutdownHook (); |
| Runtime.getRuntime ().addShutdownHook (new Thread (hook)); |
| } |
| initialised = true; |
| } |
| |
| private static final int LOOKAHEAD = 50; |
| |
| /** |
| * Returns an input stream for the specified input source. |
| * This returns a pushback stream that libxmlj can use to detect the |
| * character encoding of the stream. |
| */ |
| public static NamedInputStream getInputStream (InputSource input) |
| throws IOException |
| { |
| InputStream in = input.getByteStream (); |
| String systemId = input.getSystemId (); |
| if (in == null) |
| { |
| Reader r = input.getCharacterStream(); |
| if (r != null) |
| in = new ReaderInputStream(r); |
| } |
| if (in == null) |
| { |
| in = getInputStream(systemId); |
| } |
| return new NamedInputStream (systemId, in, LOOKAHEAD); |
| } |
| |
| /** |
| * Returns an input stream for the specified transformer source. |
| * This returns a pushback stream that libxmlj can use to detect the |
| * character encoding of the stream. |
| */ |
| public static NamedInputStream getInputStream (Source source) |
| throws IOException |
| { |
| if (source instanceof SAXSource) |
| { |
| return getInputStream (((SAXSource) source).getInputSource ()); |
| } |
| InputStream in = null; |
| String systemId = source.getSystemId (); |
| if (source instanceof StreamSource) |
| { |
| in = ((StreamSource) source).getInputStream (); |
| } |
| if (in == null) |
| { |
| in = getInputStream(systemId); |
| } |
| return new NamedInputStream (systemId, in, LOOKAHEAD); |
| } |
| |
| private static InputStream getInputStream(String systemId) |
| throws IOException |
| { |
| if (systemId == null) |
| { |
| throw new IOException("no system ID"); |
| } |
| try |
| { |
| return new URL(systemId).openStream(); |
| } |
| catch (MalformedURLException e) |
| { |
| return new FileInputStream(systemId); |
| } |
| } |
| |
| /** |
| * Returns an input stream for the specified URL. |
| * This returns a pushback stream that libxmlj can use to detect the |
| * character encoding of the stream. |
| */ |
| public static NamedInputStream getInputStream (URL url) |
| throws IOException |
| { |
| return new NamedInputStream (url.toString (), url.openStream(), |
| LOOKAHEAD); |
| } |
| |
| /** |
| * Convenience method for xmljDocLoader |
| */ |
| static NamedInputStream xmljGetInputStream(String base, String url) |
| throws IOException |
| { |
| try |
| { |
| if (base != null) |
| { |
| url = new URL(new URL(base), url).toString(); |
| } |
| } |
| catch (MalformedURLException e) |
| { |
| } |
| InputStream in = getInputStream(url); |
| return new NamedInputStream(url, in, LOOKAHEAD); |
| } |
| |
| /** |
| * Returns an output stream for the specified transformer result. |
| */ |
| public static OutputStream getOutputStream (Result result) |
| throws IOException |
| { |
| OutputStream out = null; |
| if (result instanceof StreamResult) |
| { |
| out = ((StreamResult) result).getOutputStream (); |
| } |
| if (out == null) |
| { |
| Writer w = ((StreamResult) result).getWriter (); |
| if (w != null) |
| out = new WriterOutputStream (w); |
| } |
| if (out == null) |
| { |
| String systemId = result.getSystemId (); |
| if (systemId == null) |
| { |
| throw new IOException ("no system ID"); |
| } |
| try |
| { |
| URL url = new URL (systemId); |
| URLConnection connection = url.openConnection (); |
| connection.setDoOutput (true); |
| out = connection.getOutputStream (); |
| } |
| catch (MalformedURLException e) |
| { |
| out = new FileOutputStream (systemId); |
| } |
| } |
| |
| return out; |
| } |
| |
| /** |
| * Returns the absolute form of the specified URI. |
| * If the URI is already absolute, returns it as-is. |
| * Otherwise returns a new URI relative to the given base URI. |
| */ |
| public static String getAbsoluteURI (String base, String uri) |
| { |
| if (uri != null && |
| base != null && |
| (uri.length() > 0) && |
| (uri.indexOf(':') == -1) && |
| (uri.charAt(0) != '/')) |
| { |
| // URI is relative |
| if (base.charAt(base.length() - 1) != '/') |
| { |
| int i = base.lastIndexOf('/'); |
| base = base.substring(0, i + 1); |
| } |
| return base + uri; |
| } |
| else |
| { |
| // URI is absolute or no base specified |
| return uri; |
| } |
| } |
| |
| public static String getBaseURI(String uri) |
| { |
| if (uri != null) |
| { |
| int si = uri.lastIndexOf('/'); |
| if (si != -1) |
| { |
| uri = uri.substring(0, si + 1); |
| } |
| } |
| return uri; |
| } |
| |
| } |