J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.net.www; |
| 27 | |
| 28 | import java.net.URL; |
| 29 | import java.net.ContentHandler; |
| 30 | import java.util.*; |
| 31 | import java.io.InputStream; |
| 32 | import java.io.OutputStream; |
| 33 | import java.io.BufferedInputStream; |
| 34 | import java.net.UnknownServiceException; |
| 35 | |
| 36 | /** |
| 37 | * A class to represent an active connection to an object |
| 38 | * represented by a URL. |
| 39 | * @author James Gosling |
| 40 | */ |
| 41 | |
| 42 | abstract public class URLConnection extends java.net.URLConnection { |
| 43 | |
| 44 | /** The URL that it is connected to */ |
| 45 | |
| 46 | private String contentType; |
| 47 | private int contentLength = -1; |
| 48 | |
| 49 | protected MessageHeader properties; |
| 50 | |
| 51 | /** Create a URLConnection object. These should not be created directly: |
| 52 | instead they should be created by protocol handers in response to |
| 53 | URL.openConnection. |
| 54 | @param u The URL that this connects to. |
| 55 | */ |
| 56 | public URLConnection (URL u) { |
| 57 | super(u); |
| 58 | properties = new MessageHeader(); |
| 59 | } |
| 60 | |
| 61 | /** Call this routine to get the property list for this object. |
| 62 | * Properties (like content-type) that have explicit getXX() methods |
| 63 | * associated with them should be accessed using those methods. */ |
| 64 | public MessageHeader getProperties() { |
| 65 | return properties; |
| 66 | } |
| 67 | |
| 68 | /** Call this routine to set the property list for this object. */ |
| 69 | public void setProperties(MessageHeader properties) { |
| 70 | this.properties = properties; |
| 71 | } |
| 72 | |
| 73 | public void setRequestProperty(String key, String value) { |
| 74 | if(connected) |
| 75 | throw new IllegalAccessError("Already connected"); |
| 76 | if (key == null) |
| 77 | throw new NullPointerException ("key cannot be null"); |
| 78 | properties.set(key, value); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * The following three methods addRequestProperty, getRequestProperty, |
| 83 | * and getRequestProperties were copied from the superclass implementation |
| 84 | * before it was changed by CR:6230836, to maintain backward compatibility. |
| 85 | */ |
| 86 | public void addRequestProperty(String key, String value) { |
| 87 | if (connected) |
| 88 | throw new IllegalStateException("Already connected"); |
| 89 | if (key == null) |
| 90 | throw new NullPointerException ("key is null"); |
| 91 | } |
| 92 | |
| 93 | public String getRequestProperty(String key) { |
| 94 | if (connected) |
| 95 | throw new IllegalStateException("Already connected"); |
| 96 | return null; |
| 97 | } |
| 98 | |
| 99 | public Map<String,List<String>> getRequestProperties() { |
| 100 | if (connected) |
| 101 | throw new IllegalStateException("Already connected"); |
| 102 | return Collections.EMPTY_MAP; |
| 103 | } |
| 104 | |
| 105 | public String getHeaderField(String name) { |
| 106 | try { |
| 107 | getInputStream(); |
| 108 | } catch (Exception e) { |
| 109 | return null; |
| 110 | } |
| 111 | return properties == null ? null : properties.findValue(name); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Return the key for the nth header field. Returns null if |
| 116 | * there are fewer than n fields. This can be used to iterate |
| 117 | * through all the headers in the message. |
| 118 | */ |
| 119 | public String getHeaderFieldKey(int n) { |
| 120 | try { |
| 121 | getInputStream(); |
| 122 | } catch (Exception e) { |
| 123 | return null; |
| 124 | } |
| 125 | MessageHeader props = properties; |
| 126 | return props == null ? null : props.getKey(n); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Return the value for the nth header field. Returns null if |
| 131 | * there are fewer than n fields. This can be used in conjunction |
| 132 | * with getHeaderFieldKey to iterate through all the headers in the message. |
| 133 | */ |
| 134 | public String getHeaderField(int n) { |
| 135 | try { |
| 136 | getInputStream(); |
| 137 | } catch (Exception e) { |
| 138 | return null; |
| 139 | } |
| 140 | MessageHeader props = properties; |
| 141 | return props == null ? null : props.getValue(n); |
| 142 | } |
| 143 | |
| 144 | /** Call this routine to get the content-type associated with this |
| 145 | * object. |
| 146 | */ |
| 147 | public String getContentType() { |
| 148 | if (contentType == null) |
| 149 | contentType = getHeaderField("content-type"); |
| 150 | if (contentType == null) { |
| 151 | String ct = null; |
| 152 | try { |
| 153 | ct = guessContentTypeFromStream(getInputStream()); |
| 154 | } catch(java.io.IOException e) { |
| 155 | } |
| 156 | String ce = properties.findValue("content-encoding"); |
| 157 | if (ct == null) { |
| 158 | ct = properties.findValue("content-type"); |
| 159 | |
| 160 | if (ct == null) |
| 161 | if (url.getFile().endsWith("/")) |
| 162 | ct = "text/html"; |
| 163 | else |
| 164 | ct = guessContentTypeFromName(url.getFile()); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * If the Mime header had a Content-encoding field and its value |
| 169 | * was not one of the values that essentially indicate no |
| 170 | * encoding, we force the content type to be unknown. This will |
| 171 | * cause a save dialog to be presented to the user. It is not |
| 172 | * ideal but is better than what we were previously doing, namely |
| 173 | * bringing up an image tool for compressed tar files. |
| 174 | */ |
| 175 | |
| 176 | if (ct == null || ce != null && |
| 177 | !(ce.equalsIgnoreCase("7bit") |
| 178 | || ce.equalsIgnoreCase("8bit") |
| 179 | || ce.equalsIgnoreCase("binary"))) |
| 180 | ct = "content/unknown"; |
| 181 | setContentType(ct); |
| 182 | } |
| 183 | return contentType; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Set the content type of this URL to a specific value. |
| 188 | * @param type The content type to use. One of the |
| 189 | * content_* static variables in this |
| 190 | * class should be used. |
| 191 | * eg. setType(URL.content_html); |
| 192 | */ |
| 193 | public void setContentType(String type) { |
| 194 | contentType = type; |
| 195 | properties.set("content-type", type); |
| 196 | } |
| 197 | |
| 198 | /** Call this routine to get the content-length associated with this |
| 199 | * object. |
| 200 | */ |
| 201 | public int getContentLength() { |
| 202 | try { |
| 203 | getInputStream(); |
| 204 | } catch (Exception e) { |
| 205 | return -1; |
| 206 | } |
| 207 | int l = contentLength; |
| 208 | if (l < 0) { |
| 209 | try { |
| 210 | l = Integer.parseInt(properties.findValue("content-length")); |
| 211 | setContentLength(l); |
| 212 | } catch(Exception e) { |
| 213 | } |
| 214 | } |
| 215 | return l; |
| 216 | } |
| 217 | |
| 218 | /** Call this routine to set the content-length associated with this |
| 219 | * object. |
| 220 | */ |
| 221 | protected void setContentLength(int length) { |
| 222 | contentLength = length; |
| 223 | properties.set("content-length", String.valueOf(length)); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Returns true if the data associated with this URL can be cached. |
| 228 | */ |
| 229 | public boolean canCache() { |
| 230 | return url.getFile().indexOf('?') < 0 /* && url.postData == null |
| 231 | REMIND */ ; |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * Call this to close the connection and flush any remaining data. |
| 236 | * Overriders must remember to call super.close() |
| 237 | */ |
| 238 | public void close() { |
| 239 | url = null; |
| 240 | } |
| 241 | } |