1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/jaf_classes/javax/activation/CommandMap.java Wed Apr 27 01:27:09 2016 +0800
1.3 @@ -0,0 +1,235 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package javax.activation;
1.30 +
1.31 +import java.util.Map;
1.32 +import java.util.WeakHashMap;
1.33 +
1.34 +
1.35 +/**
1.36 + * The CommandMap class provides an interface to a registry of
1.37 + * command objects available in the system.
1.38 + * Developers are expected to either use the CommandMap
1.39 + * implementation included with this package (MailcapCommandMap) or
1.40 + * develop their own. Note that some of the methods in this class are
1.41 + * abstract.
1.42 + *
1.43 + * @since 1.6
1.44 + */
1.45 +public abstract class CommandMap {
1.46 + private static CommandMap defaultCommandMap = null;
1.47 + private static Map<ClassLoader,CommandMap> map =
1.48 + new WeakHashMap<ClassLoader,CommandMap>();
1.49 +
1.50 + /**
1.51 + * Get the default CommandMap.
1.52 + * <p>
1.53 + *
1.54 + * <ul>
1.55 + * <li> In cases where a CommandMap instance has been previously set
1.56 + * to some value (via <i>setDefaultCommandMap</i>)
1.57 + * return the CommandMap.
1.58 + * <li>
1.59 + * In cases where no CommandMap has been set, the CommandMap
1.60 + * creates an instance of <code>MailcapCommandMap</code> and
1.61 + * set that to the default, returning its value.
1.62 + *
1.63 + * </ul>
1.64 + *
1.65 + * @return the CommandMap
1.66 + */
1.67 + public static synchronized CommandMap getDefaultCommandMap() {
1.68 + if (defaultCommandMap != null)
1.69 + return defaultCommandMap;
1.70 +
1.71 + // fetch per-thread-context-class-loader default
1.72 + ClassLoader tccl = SecuritySupport.getContextClassLoader();
1.73 + CommandMap def = map.get(tccl);
1.74 + if (def == null) {
1.75 + def = new MailcapCommandMap();
1.76 + map.put(tccl, def);
1.77 + }
1.78 + return def;
1.79 + }
1.80 +
1.81 + /**
1.82 + * Set the default CommandMap. Reset the CommandMap to the default by
1.83 + * calling this method with <code>null</code>.
1.84 + *
1.85 + * @param commandMap The new default CommandMap.
1.86 + * @exception SecurityException if the caller doesn't have permission
1.87 + * to change the default
1.88 + */
1.89 + public static synchronized void setDefaultCommandMap(CommandMap commandMap) {
1.90 + SecurityManager security = System.getSecurityManager();
1.91 + if (security != null) {
1.92 + try {
1.93 + // if it's ok with the SecurityManager, it's ok with me...
1.94 + security.checkSetFactory();
1.95 + } catch (SecurityException ex) {
1.96 + // otherwise, we also allow it if this code and the
1.97 + // factory come from the same (non-system) class loader (e.g.,
1.98 + // the JAF classes were loaded with the applet classes).
1.99 + if (CommandMap.class.getClassLoader() == null ||
1.100 + CommandMap.class.getClassLoader() !=
1.101 + commandMap.getClass().getClassLoader())
1.102 + throw ex;
1.103 + }
1.104 + }
1.105 + // remove any per-thread-context-class-loader CommandMap
1.106 + map.remove(SecuritySupport.getContextClassLoader());
1.107 + defaultCommandMap = commandMap;
1.108 + }
1.109 +
1.110 + /**
1.111 + * Get the preferred command list from a MIME Type. The actual semantics
1.112 + * are determined by the implementation of the CommandMap.
1.113 + *
1.114 + * @param mimeType the MIME type
1.115 + * @return the CommandInfo classes that represent the command Beans.
1.116 + */
1.117 + abstract public CommandInfo[] getPreferredCommands(String mimeType);
1.118 +
1.119 + /**
1.120 + * Get the preferred command list from a MIME Type. The actual semantics
1.121 + * are determined by the implementation of the CommandMap. <p>
1.122 + *
1.123 + * The <code>DataSource</code> provides extra information, such as
1.124 + * the file name, that a CommandMap implementation may use to further
1.125 + * refine the list of commands that are returned. The implementation
1.126 + * in this class simply calls the <code>getPreferredCommands</code>
1.127 + * method that ignores this argument.
1.128 + *
1.129 + * @param mimeType the MIME type
1.130 + * @param ds a DataSource for the data
1.131 + * @return the CommandInfo classes that represent the command Beans.
1.132 + * @since JAF 1.1
1.133 + */
1.134 + public CommandInfo[] getPreferredCommands(String mimeType, DataSource ds) {
1.135 + return getPreferredCommands(mimeType);
1.136 + }
1.137 +
1.138 + /**
1.139 + * Get all the available commands for this type. This method
1.140 + * should return all the possible commands for this MIME type.
1.141 + *
1.142 + * @param mimeType the MIME type
1.143 + * @return the CommandInfo objects representing all the commands.
1.144 + */
1.145 + abstract public CommandInfo[] getAllCommands(String mimeType);
1.146 +
1.147 + /**
1.148 + * Get all the available commands for this type. This method
1.149 + * should return all the possible commands for this MIME type. <p>
1.150 + *
1.151 + * The <code>DataSource</code> provides extra information, such as
1.152 + * the file name, that a CommandMap implementation may use to further
1.153 + * refine the list of commands that are returned. The implementation
1.154 + * in this class simply calls the <code>getAllCommands</code>
1.155 + * method that ignores this argument.
1.156 + *
1.157 + * @param mimeType the MIME type
1.158 + * @param ds a DataSource for the data
1.159 + * @return the CommandInfo objects representing all the commands.
1.160 + * @since JAF 1.1
1.161 + */
1.162 + public CommandInfo[] getAllCommands(String mimeType, DataSource ds) {
1.163 + return getAllCommands(mimeType);
1.164 + }
1.165 +
1.166 + /**
1.167 + * Get the default command corresponding to the MIME type.
1.168 + *
1.169 + * @param mimeType the MIME type
1.170 + * @param cmdName the command name
1.171 + * @return the CommandInfo corresponding to the command.
1.172 + */
1.173 + abstract public CommandInfo getCommand(String mimeType, String cmdName);
1.174 +
1.175 + /**
1.176 + * Get the default command corresponding to the MIME type. <p>
1.177 + *
1.178 + * The <code>DataSource</code> provides extra information, such as
1.179 + * the file name, that a CommandMap implementation may use to further
1.180 + * refine the command that is chosen. The implementation
1.181 + * in this class simply calls the <code>getCommand</code>
1.182 + * method that ignores this argument.
1.183 + *
1.184 + * @param mimeType the MIME type
1.185 + * @param cmdName the command name
1.186 + * @param ds a DataSource for the data
1.187 + * @return the CommandInfo corresponding to the command.
1.188 + * @since JAF 1.1
1.189 + */
1.190 + public CommandInfo getCommand(String mimeType, String cmdName,
1.191 + DataSource ds) {
1.192 + return getCommand(mimeType, cmdName);
1.193 + }
1.194 +
1.195 + /**
1.196 + * Locate a DataContentHandler that corresponds to the MIME type.
1.197 + * The mechanism and semantics for determining this are determined
1.198 + * by the implementation of the particular CommandMap.
1.199 + *
1.200 + * @param mimeType the MIME type
1.201 + * @return the DataContentHandler for the MIME type
1.202 + */
1.203 + abstract public DataContentHandler createDataContentHandler(String
1.204 + mimeType);
1.205 +
1.206 + /**
1.207 + * Locate a DataContentHandler that corresponds to the MIME type.
1.208 + * The mechanism and semantics for determining this are determined
1.209 + * by the implementation of the particular CommandMap. <p>
1.210 + *
1.211 + * The <code>DataSource</code> provides extra information, such as
1.212 + * the file name, that a CommandMap implementation may use to further
1.213 + * refine the choice of DataContentHandler. The implementation
1.214 + * in this class simply calls the <code>createDataContentHandler</code>
1.215 + * method that ignores this argument.
1.216 + *
1.217 + * @param mimeType the MIME type
1.218 + * @param ds a DataSource for the data
1.219 + * @return the DataContentHandler for the MIME type
1.220 + * @since JAF 1.1
1.221 + */
1.222 + public DataContentHandler createDataContentHandler(String mimeType,
1.223 + DataSource ds) {
1.224 + return createDataContentHandler(mimeType);
1.225 + }
1.226 +
1.227 + /**
1.228 + * Get all the MIME types known to this command map.
1.229 + * If the command map doesn't support this operation,
1.230 + * null is returned.
1.231 + *
1.232 + * @return array of MIME types as strings, or null if not supported
1.233 + * @since JAF 1.1
1.234 + */
1.235 + public String[] getMimeTypes() {
1.236 + return null;
1.237 + }
1.238 +}
