Initial revision

From-SVN: r102074
2005-07-16 00:30:23 +00:00
parent 6f4434b39b
commit f911ba985a
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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;
+  }
+  
+}