ontopoly
Class OntopolyAccessStrategy

java.lang.Object
  ontopoly.OntopolyAccessStrategy

All Implemented Interfaces:

java.io.Serializable

public abstract class OntopolyAccessStrategy
extends java.lang.Object
implements java.io.Serializable

Default access strategy implementation used by OntopolyApplication. Subclasses can extend this functionality to enable authentication and/or authorization for their ontopoly instance. To activate your own implementation, create an extension of OntopolyApplication and override the OntopolyApplication.newAccessStrategy() method.

See Also:

Ontopia googlecode - OntopolyHowTo, OntopolyApplication, OntopolyApplication.newAccessStrategy(), Serialized Form

Nested Class Summary

static class

OntopolyAccessStrategy.Privilege The set of Privileges that a user can have.

Constructor Summary

OntopolyAccessStrategy()

Method Summary

User	authenticate(java.lang.String username, java.lang.String password) Attempts to authenticate a user with given name and password.
User	autoAuthenticate(javax.servlet.http.HttpServletRequest request) Automatically authenticates a user based on a request made.
OntopolyAccessStrategy.Privilege	getPrivilege(User user, FieldInstance fieldInstance) Resolves the privilege of a user for the provided field.
OntopolyAccessStrategy.Privilege	getPrivilege(User user, Topic topic) Resolves the privilege of a user for the provided topic.
java.lang.String	getSignInMessage() Returns the message displayed on the login page.
boolean	isEnabled() Indicates if this strategy is enabled.

Methods inherited from class java.lang.Object

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

Constructor Detail

OntopolyAccessStrategy

public OntopolyAccessStrategy()

Method Detail

isEnabled

public boolean isEnabled()

Indicates if this strategy is enabled. An enabled strategy will cause the login page to be used. The default implementation always returns true.

Returns:

True if the strategy is enabled, false if disabled.

autoAuthenticate

public User autoAuthenticate(javax.servlet.http.HttpServletRequest request)

Automatically authenticates a user based on a request made. Subclasses can implement a remember-me functionality by using this method, for example by checking the presence of a cookie. Default implementation always returns null.

Parameters:

request - The request made that requires automatic authentication checks

Returns:

A User object when the automated authentication has succeeded, or null.

authenticate

public User authenticate(java.lang.String username,
                         java.lang.String password)

Attempts to authenticate a user with given name and password. Subclasses should override this method to include their user verification. The default implementation makes a new user with username as name, and ignores the provided password. Note that subclasses should not throw exceptions when authentication fails, but instead return null.

Parameters:

username - The username to authenticate

password - The password in plain text used by the user attempting to login

Returns:

A User object when authentication succeeded, or null

getPrivilege

public OntopolyAccessStrategy.Privilege getPrivilege(User user,
                                                     Topic topic)

Resolves the privilege of a user for the provided topic. In this context, the privileges mean:

• Privilege.EDIT: The user is allowed to change this topic
• Privilege.READ_ONLY: The user is allowed to view this topic, but not to change it.
• Privilege.NONE: The user is not allowed to view or change this topic.

Parameters:

user - The user to retrieve the privilege for

topic - The topic the user is trying to access

Returns:

The privilege of the user regarding the provided topic. Must not be null.

getPrivilege

public OntopolyAccessStrategy.Privilege getPrivilege(User user,
                                                     FieldInstance fieldInstance)

Resolves the privilege of a user for the provided field. In this context, the privileges mean:

• Privilege.EDIT: The user is allowed to change this field
• Privilege.READ_ONLY: The user is allowed to view this field, but not to change it.
• Privilege.NONE: The user is not allowed to view or change this field.

The field privilege has precedence over the topic privilege provided by getPrivilege(User, Topic).

Parameters:

user - The user to retrieve the privilege for

fieldInstance - The fieldinstance the user is trying to access

Returns:

The privilege of the user regarding the provided fieldinstance. Must not be null.

getSignInMessage

public java.lang.String getSignInMessage()

Returns the message displayed on the login page.

Returns:

The message displayed on the login page