com.atlassian.confluence.core.service
Interface ServiceCommand

All Known Subinterfaces:

CreateCommentCommand, DeleteCommentCommand, EditCommentCommand, MovePageCommand, TrashPageCommand

All Known Implementing Classes:

AbstractServiceCommand, CreateCommentCommandImpl, DeleteCommentCommandImpl, EditCommentCommandImpl, MovePageCommandImpl, MovePageToTopOfSpaceCommand, RunAsUserCommand, TrashPageCommandImpl

public interface ServiceCommand

A command forming part of Confluence's service layer. Command instances are retrieved from service interfaces (you should never instantiate a command object directly). For more information about the service layer, see the documentation below. If you are creating a new service command, it is best to extend AbstractServiceCommand, as it enforces much of the contract that a command must obey.

The ServiceCommand interface is designed such that commands can be executed in two modes: either by calling the authorize/validate/execute methods separately, or by calling execute directly and dealing with authorization or validation failures as exceptions.

A well-behaved service command implementation must:

• Accept all parameter input in its constructor
• Only mutate its internal state in response to the methods defined on this interface

Service commands are not thread-safe.

See Also:

AbstractServiceCommand, Confluence Service Layer Documentation

Method Summary

void	execute() Execute the command.
java.util.Collection	getValidationErrors() Gets the list of errors that are preventing the command from being executed.
boolean	isAuthorized() Determine if the current user is authorized to execute this command.
boolean	isValid() Determine if the command is in a valid state to be executed.

Method Detail

isValid

boolean isValid()

Determine if the command is in a valid state to be executed. If this method returns true, then execute() is be expected to perform successfully (unless prevented by some system error). If this method returns false, execute will fail with a NotValidException.

This method should be called after checking isAuthorized(). If the current user is not authorized to execute this command, this method must throw a NotAuthorizedException.

If this method returns false, then getValidationErrors() must return a non-empty list of errors explaining why the command was not valid. If this method returns true, the collection returned by getValidationErrors() must be empty.

Returns:

true if the command is in a valid state to be executed, false otherwise

Throws:

NotAuthorizedException - if calling isValid() on the command would return false.

getValidationErrors

java.util.Collection getValidationErrors()

Gets the list of errors that are preventing the command from being executed. Calling this method before calling isValid() will always return an empty collection.

Returns:

a collection of ValidationError objects describing why command validation failed

isAuthorized

boolean isAuthorized()

Determine if the current user is authorized to execute this command. The "current user" for a command is the user returned by AuthenticatedUserThreadLocal.getUser().

Returns:

true if the current user is authorized to execute this command, false otherwise.

execute

void execute()

Execute the command. After execution, the command should offer any indication of the results or products of the command as implementation-specific getter methods.

Throws:

NotAuthorizedException - if calling isAuthorized() on this command would return false

NotValidException - if calling isValid() on this command would return false

java.lang.IllegalStateException - if the command has already been executed