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+/* URLDataSource.java -- Data source for a URL object.
+ 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 javax.activation;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URL;
+import java.net.URLConnection;
+
+/**
+ * DataSource implementation that retrieves its data from a URL.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ * @version 1.1
+ */
+public class URLDataSource
+ implements DataSource
+{
+
+ private final URL url;
+ private URLConnection connection;
+
+ /**
+ * Constructor.
+ * This will not open the connection to the URL.
+ */
+ public URLDataSource(URL url)
+ {
+ this.url = url;
+ }
+
+ /**
+ * Returns the Content-Type header for the URL.
+ * In the case of failure or lack of such a header,
+ * returns "application/octet-stream".
+ */
+ public String getContentType()
+ {
+ try
+ {
+ if (connection == null)
+ {
+ connection = url.openConnection();
+ }
+ }
+ catch (IOException e)
+ {
+ }
+ String contentType = null;
+ if (connection != null)
+ {
+ contentType = connection.getContentType();
+ }
+ if (contentType == null)
+ {
+ contentType = "application/octet-stream";
+ }
+ return contentType;
+ }
+
+ /**
+ * Returns the result of <code>getFile</code> of the underlying URL.
+ */
+ public String getName()
+ {
+ return url.getFile();
+ }
+
+ public InputStream getInputStream()
+ throws IOException
+ {
+ connection = url.openConnection();
+ if (connection != null)
+ {
+ connection.setDoInput(true);
+ return connection.getInputStream();
+ }
+ return null;
+ }
+
+ public OutputStream getOutputStream()
+ throws IOException
+ {
+ connection = url.openConnection();
+ if (connection != null)
+ {
+ connection.setDoOutput(true);
+ return connection.getOutputStream();
+ }
+ return null;
+ }
+
+ /**
+ * Returns the underlying URL.
+ */
+ public URL getURL()
+ {
+ return url;
+ }
+
+}