CommandMap (Java EE 5 SDK)

javax.activation Class CommandMap

java.lang.Object
  javax.activation.CommandMap

直接已知子类:

MailcapCommandMap

public abstract class CommandMap

extends Object

The CommandMap class provides an interface to a registry of command objects available in the system. Developers are expected to either use the CommandMap implementation included with this package (MailcapCommandMap) or develop their own. Note that some of the methods in this class are abstract.

CommandMap

public CommandMap()

getDefaultCommandMap

public static CommandMap getDefaultCommandMap()

Get the default CommandMap.

• In cases where a CommandMap instance has been previously set to some value (via setDefaultCommandMap) return the CommandMap.
• In cases where no CommandMap has been set, the CommandMap creates an instance of MailcapCommandMap and set that to the default, returning its value.

返回:

the CommandMap

setDefaultCommandMap

public static void setDefaultCommandMap(CommandMap commandMap)

Set the default CommandMap. Reset the CommandMap to the default by calling this method with null.

参数:

commandMap - The new default CommandMap.

抛出异常:

SecurityException - if the caller doesn't have permission to change the default

getPreferredCommands

public abstract CommandInfo[] getPreferredCommands(String mimeType)

Get the preferred command list from a MIME Type. The actual semantics are determined by the implementation of the CommandMap.

参数:

mimeType - the MIME type

返回:

the CommandInfo classes that represent the command Beans.

getPreferredCommands

public CommandInfo[] getPreferredCommands(String mimeType,
                                          DataSource ds)

Get the preferred command list from a MIME Type. The actual semantics are determined by the implementation of the CommandMap.

The DataSource provides extra information, such as the file name, that a CommandMap implementation may use to further refine the list of commands that are returned. The implementation in this class simply calls the getPreferredCommands method that ignores this argument.

参数:

mimeType - the MIME type

ds - a DataSource for the data

返回:

the CommandInfo classes that represent the command Beans.

从以下版本开始:

JAF 1.1

getAllCommands

public abstract CommandInfo[] getAllCommands(String mimeType)

Get all the available commands for this type. This method should return all the possible commands for this MIME type.

参数:

mimeType - the MIME type

返回:

the CommandInfo objects representing all the commands.

getAllCommands

public CommandInfo[] getAllCommands(String mimeType,
                                    DataSource ds)

Get all the available commands for this type. This method should return all the possible commands for this MIME type.

The DataSource provides extra information, such as the file name, that a CommandMap implementation may use to further refine the list of commands that are returned. The implementation in this class simply calls the getAllCommands method that ignores this argument.

参数:

mimeType - the MIME type

ds - a DataSource for the data

返回:

the CommandInfo objects representing all the commands.

从以下版本开始:

JAF 1.1

getCommand

public abstract CommandInfo getCommand(String mimeType,
                                       String cmdName)

Get the default command corresponding to the MIME type.

参数:

mimeType - the MIME type

cmdName - the command name

返回:

the CommandInfo corresponding to the command.

getCommand

public CommandInfo getCommand(String mimeType,
                              String cmdName,
                              DataSource ds)

Get the default command corresponding to the MIME type.

The DataSource provides extra information, such as the file name, that a CommandMap implementation may use to further refine the command that is chosen. The implementation in this class simply calls the getCommand method that ignores this argument.

参数:

mimeType - the MIME type

cmdName - the command name

ds - a DataSource for the data

返回:

the CommandInfo corresponding to the command.

从以下版本开始:

JAF 1.1

createDataContentHandler

public abstract DataContentHandler createDataContentHandler(String mimeType)

Locate a DataContentHandler that corresponds to the MIME type. The mechanism and semantics for determining this are determined by the implementation of the particular CommandMap.

参数:

mimeType - the MIME type

返回:

the DataContentHandler for the MIME type

createDataContentHandler

public DataContentHandler createDataContentHandler(String mimeType,
                                                   DataSource ds)

Locate a DataContentHandler that corresponds to the MIME type. The mechanism and semantics for determining this are determined by the implementation of the particular CommandMap.

The DataSource provides extra information, such as the file name, that a CommandMap implementation may use to further refine the choice of DataContentHandler. The implementation in this class simply calls the createDataContentHandler method that ignores this argument.

参数:

mimeType - the MIME type

ds - a DataSource for the data

返回:

the DataContentHandler for the MIME type

从以下版本开始:

JAF 1.1

getMimeTypes

public String[] getMimeTypes()

Get all the MIME types known to this command map. If the command map doesn't support this operation, null is returned.

返回:

array of MIME types as strings, or null if not supported

从以下版本开始:

JAF 1.1

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