org.jivesoftware.wildfire.commands
Class AdHocCommand

java.lang.Object
  org.jivesoftware.wildfire.commands.AdHocCommand

Direct Known Subclasses:

AddGroup, AddGroupUsers, AddUser, AuthenticateUser, ChangeUserPassword, DeleteGroup, DeleteGroupUsers, GetListActiveUsers, GetListGroups, GetListGroupUsers, GetNumberActiveUsers, GetNumberOnlineUsers, GetNumberUserSessions, GetServerStats, GetUsersPresence, HttpBindStatus, PacketsNotification, UpdateGroup, UserProperties

public abstract class AdHocCommand
extends Object

An ad-hoc command is a stateless object responsbile for executing the provided service. Each subclass will only have one instance that will be shared across all users sessions. Therefore, it is important to not keep any information related to executions as permanent data (i.e. as instance or static variables). Each command has a code that should be unique within a given JID.

Commands may have zero or more stages. Each stage is usually used for gathering information required for the command execution. Users are able to move forward or backward across the different stages. Commands may not be cancelled while they are beig executed. However, users may request the "cancel" action when submiting a stage response indicating that the command execution should be aborted. Thus, releasing any collected information. Commands that require user interaction (i.e. have more than one stage) will have to provide the data forms the user must complete in each stage and the allowed actions the user might perform during each stage (e.g. go to the previous stage or go to the next stage).

Author:

Gaston Dombiak

Nested Class Summary

static class	AdHocCommand.Action
static class	AdHocCommand.Status

Constructor Summary

AdHocCommand()

Method Summary

void	addNextStageInformation(SessionData data, org.dom4j.Element command) Increments the stage number by one and adds to the command element the new data form and new allowed actions that the user might perform.
void	addPreviousStageInformation(SessionData data, org.dom4j.Element command) Decrements the stage number by one and adds to the command the data form and allowed actions that the user might perform of the previous stage.
protected void	addStageActions(SessionData data, org.dom4j.Element command) Adds the allowed actions to follow from the current stage.
protected abstract void	addStageInformation(SessionData data, org.dom4j.Element command) Adds to the command element the data form or notes required by the current stage.
abstract void	execute(SessionData data, org.dom4j.Element command) Executes the command with the specified session data.
protected abstract List<AdHocCommand.Action>	getActions(SessionData data) Returns a collection with the allowed actions based on the current stage as defined in the SessionData.
abstract String	getCode() Returns the unique identifier for this command for the containing JID.
abstract String	getDefaultLabel() Returns the default label used for describing this commmand.
protected abstract AdHocCommand.Action	getExecuteAction(SessionData data) Returns which of the actions available for the current stage is considered the equivalent to "execute".
String	getLabel()
abstract int	getMaxStages(SessionData data) Returns the max number of stages for this command.
boolean	hasPermission(JID requester) Returns true if the requester is allowed to execute this command.
void	setLabel(String label)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AdHocCommand

public AdHocCommand()

Method Detail

getLabel

public String getLabel()

setLabel

public void setLabel(String label)

hasPermission

public boolean hasPermission(JID requester)

Returns true if the requester is allowed to execute this command. By default only admins are allowed to execute commands. Subclasses may redefine this method with any specific logic.

Note: The bare JID of the requester will be compared with the bare JID of the admins.

Parameters:

requester - the JID of the user requesting to execute this command.

Returns:

true if the requester is allowed to execute this command.

getCode

public abstract String getCode()

Returns the unique identifier for this command for the containing JID. The code will be used as the node in the disco#items or the node when executing the command.

Returns:

the unique identifier for this command for the containing JID.

getDefaultLabel

public abstract String getDefaultLabel()

Returns the default label used for describing this commmand. This information is usually used when returning commands as disco#items. Admins can later use setLabel(String) to set a new label and reset to the default value at any time.

Returns:

the default label used for describing this commmand.

getMaxStages

public abstract int getMaxStages(SessionData data)

Returns the max number of stages for this command. The number of stages may vary according to the collected data in previous stages. Therefore, a SessionData object is passed as a parameter. When the max number of stages has been reached then the command is ready to be executed.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages or the requester is requesting the execution for the first time.

Returns:

the max number of stages for this command.

execute

public abstract void execute(SessionData data,
                             org.dom4j.Element command)

Executes the command with the specified session data.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages.

command - the command element to be sent to the command requester with a reported data result or note element with the answer of the execution.

addStageInformation

protected abstract void addStageInformation(SessionData data,
                                            org.dom4j.Element command)

Adds to the command element the data form or notes required by the current stage. The current stage is specified in the SessionData. This method will never be invoked for commands that have no stages.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages or the requester is requesting the execution for the first time.

command - the command element to be sent to the command requester.

getActions

protected abstract List<AdHocCommand.Action> getActions(SessionData data)

Returns a collection with the allowed actions based on the current stage as defined in the SessionData. Possible actions are: prev, next and complete. This method will never be invoked for commands that have no stages.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages or the requester is requesting the execution for the first time.

Returns:

a collection with the allowed actions based on the current stage as defined in the SessionData.

getExecuteAction

protected abstract AdHocCommand.Action getExecuteAction(SessionData data)

Returns which of the actions available for the current stage is considered the equivalent to "execute". When the requester sends his reply, if no action was defined in the command then the action will be assumed "execute" thus assuming the action returned by this method. This method will never be invoked for commands that have no stages.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages or the requester is requesting the execution for the first time.

Returns:

which of the actions available for the current stage is considered the equivalent to "execute".

addNextStageInformation

public void addNextStageInformation(SessionData data,
                                    org.dom4j.Element command)

Increments the stage number by one and adds to the command element the new data form and new allowed actions that the user might perform.

Parameters:

data - the gathered data through the command stages.

command - the command element to be sent to the command requester.

addPreviousStageInformation

public void addPreviousStageInformation(SessionData data,
                                        org.dom4j.Element command)

Decrements the stage number by one and adds to the command the data form and allowed actions that the user might perform of the previous stage.

Parameters:

data - the gathered data through the command stages.

command - the command element to be sent to the command requester.

addStageActions

protected void addStageActions(SessionData data,
                               org.dom4j.Element command)

Adds the allowed actions to follow from the current stage. Possible actions are: prev, next and complete.

Parameters:

data - the gathered data through the command stages or null if the command does not have stages or the requester is requesting the execution for the first time.

command - the command element to be sent to the command requester.