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+/* 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;
+ }
+
+}