001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020 package javax.activation; 021 022 import java.io.IOException; 023 import java.io.InputStream; 024 import java.io.OutputStream; 025 import java.net.URL; 026 import java.net.URLConnection; 027 028 /** 029 * @version $Rev: 467553 $ $Date: 2006-10-25 06:01:51 +0200 (Mi, 25. Okt 2006) $ 030 */ 031 public class URLDataSource implements DataSource { 032 private final static String DEFAULT_CONTENT_TYPE = "application/octet-stream"; 033 034 private final URL url; 035 036 /** 037 * Creates a URLDataSource from a URL object. 038 */ 039 public URLDataSource(URL url) { 040 this.url = url; 041 } 042 043 /** 044 * Returns the value of the URL content-type header field. 045 * This method calls URL.openConnection() to obtain a connection 046 * from which to obtain the content type. If this fails or 047 * a getContentType() returns null then "application/octet-stream" 048 * is returned. 049 */ 050 public String getContentType() { 051 try { 052 URLConnection connection = url.openConnection(); 053 String type = connection.getContentType(); 054 return type == null ? DEFAULT_CONTENT_TYPE : type; 055 } catch (IOException e) { 056 return DEFAULT_CONTENT_TYPE; 057 } 058 } 059 060 /** 061 * Returns the file name of the URL object. 062 * @return the name as returned by URL.getFile() 063 */ 064 public String getName() { 065 return url.getFile(); 066 } 067 068 /** 069 * Returns an InputStream obtained from the URL. 070 * @return the InputStream from URL.openStream() 071 */ 072 public InputStream getInputStream() throws IOException { 073 return url.openStream(); 074 } 075 076 /** 077 * Returns an OutputStream obtained from the URL. 078 */ 079 public OutputStream getOutputStream() throws IOException { 080 URLConnection connection = url.openConnection(); 081 connection.setDoOutput(true); 082 return connection.getOutputStream(); 083 } 084 085 /** 086 * Returns the URL of the data source. 087 */ 088 public URL getURL() { 089 return url; 090 } 091 }