| /* |
| * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.activation; |
| |
| import java.net.URL; |
| import java.net.URLConnection; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| /** |
| * The URLDataSource class provides an object that wraps a <code>URL</code> |
| * object in a DataSource interface. URLDataSource simplifies the handling |
| * of data described by URLs within the JavaBeans Activation Framework |
| * because this class can be used to create new DataHandlers. <i>NOTE: The |
| * DataHandler object creates a URLDataSource internally, |
| * when it is constructed with a URL.</i> |
| * |
| * @see javax.activation.DataSource |
| * @see javax.activation.DataHandler |
| * |
| * @since 1.6 |
| */ |
| public class URLDataSource implements DataSource { |
| private URL url = null; |
| private URLConnection url_conn = null; |
| |
| /** |
| * URLDataSource constructor. The URLDataSource class will |
| * not open a connection to the URL until a method requiring it |
| * to do so is called. |
| * |
| * @param url The URL to be encapsulated in this object. |
| */ |
| public URLDataSource(URL url) { |
| this.url = url; |
| } |
| |
| /** |
| * Returns the value of the URL content-type header field. |
| * It calls the URL's <code>URLConnection.getContentType</code> method |
| * after retrieving a URLConnection object. |
| * <i>Note: this method attempts to call the <code>openConnection</code> |
| * method on the URL. If this method fails, or if a content type is not |
| * returned from the URLConnection, getContentType returns |
| * "application/octet-stream" as the content type.</i> |
| * |
| * @return the content type. |
| */ |
| public String getContentType() { |
| String type = null; |
| |
| try { |
| if (url_conn == null) |
| url_conn = url.openConnection(); |
| } catch (IOException e) { } |
| |
| if (url_conn != null) |
| type = url_conn.getContentType(); |
| |
| if (type == null) |
| type = "application/octet-stream"; |
| |
| return type; |
| } |
| |
| /** |
| * Calls the <code>getFile</code> method on the URL used to |
| * instantiate the object. |
| * |
| * @return the result of calling the URL's getFile method. |
| */ |
| public String getName() { |
| return url.getFile(); |
| } |
| |
| /** |
| * The getInputStream method from the URL. Calls the |
| * <code>openStream</code> method on the URL. |
| * |
| * @return the InputStream. |
| */ |
| public InputStream getInputStream() throws IOException { |
| return url.openStream(); |
| } |
| |
| /** |
| * The getOutputStream method from the URL. First an attempt is |
| * made to get the URLConnection object for the URL. If that |
| * succeeds, the getOutputStream method on the URLConnection |
| * is returned. |
| * |
| * @return the OutputStream. |
| */ |
| public OutputStream getOutputStream() throws IOException { |
| // get the url connection if it is available |
| url_conn = url.openConnection(); |
| |
| if (url_conn != null) { |
| url_conn.setDoOutput(true); |
| return url_conn.getOutputStream(); |
| } else |
| return null; |
| } |
| |
| /** |
| * Return the URL used to create this DataSource. |
| * |
| * @return The URL. |
| */ |
| public URL getURL() { |
| return url; |
| } |
| } |