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