Package org.osgi.framework

Class CapabilityPermission

java.lang.Object

java.security.Permission

java.security.BasicPermission

org.osgi.framework.CapabilityPermission

All Implemented Interfaces:

Serializable, Guard

public final class CapabilityPermission
extends BasicPermission

A bundle's authority to provide or require a capability.

• The provide action allows a bundle to provide a capability matching the specified filter.
• The require action allows a bundle to require a capability matching the specified filter.

Since:

1.6

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static String	PROVIDE	The action string provide.
static String	REQUIRE	The action string require.

Constructor Summary

Constructors

Constructor	Description
CapabilityPermission(String name, String actions)	Create a new CapabilityPermission.
CapabilityPermission(String namespace, Map<String,?> attributes, Bundle providingBundle, String actions)	Creates a new requested CapabilityPermission object to be used by code that must perform checkPermission for the require action.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Determines the equality of two CapabilityPermission objects.
String	getActions()	Returns the canonical string representation of the actions.
int	hashCode()	Returns the hash code value for this object.
boolean	implies(Permission p)	Determines if a CapabilityPermission object "implies" the specified permission.
PermissionCollection	newPermissionCollection()	Returns a new PermissionCollection object for storing CapabilityPermission objects.

Methods inherited from class java.security.Permission

checkGuard, getName, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

REQUIRE

public static final String REQUIRE

The action string require.

See Also:

Constant Field Values

PROVIDE

public static final String PROVIDE

The action string provide.

See Also:

Constant Field Values

Constructor Detail

CapabilityPermission

public CapabilityPermission(String name,
                            String actions)

Create a new CapabilityPermission.

The name is specified as a dot-separated string. Wildcards may be used.

 name ::= <namespace> | <namespace ending in ".*"> | *
 

Examples:

 com.acme.capability.*
 org.foo.capability
 *
 

For the require action, the name can also be a filter expression. The filter gives access to the capability attributes as well as the following attributes:

• signer - A Distinguished Name chain used to sign the bundle providing the capability. Wildcards in a DN are not matched according to the filter string rules, but according to the rules defined for a DN chain.
• location - The location of the bundle providing the capability.
• id - The bundle ID of the bundle providing the capability.
• name - The symbolic name of the bundle providing the capability.
• capability.namespace - The namespace of the required capability.

Since the above attribute names may conflict with attribute names of a capability, you can prefix an attribute name with '@' in the filter expression to match against the capability attributes and not one of the above attributes. Filter attribute names are processed in a case sensitive manner.

There are two possible actions: require and provide. The require permission allows the owner of this permission to require a capability matching the attributes. The provide permission allows the bundle to provide a capability in the specified capability namespace.

Parameters:

name - The capability namespace or a filter over the attributes.

actions - require,provide (canonical order)

Throws:

IllegalArgumentException - If the specified name is a filter expression and either the specified action is not require or the filter has an invalid syntax.

CapabilityPermission

public CapabilityPermission(String namespace,
                            Map<String,?> attributes,
                            Bundle providingBundle,
                            String actions)

Creates a new requested CapabilityPermission object to be used by code that must perform checkPermission for the require action. CapabilityPermission objects created with this constructor cannot be added to a CapabilityPermission permission collection.

Parameters:

namespace - The requested capability namespace.

attributes - The requested capability attributes.

providingBundle - The bundle providing the requested capability.

actions - The action require.

Throws:

IllegalArgumentException - If the specified action is not require or attributes or providingBundle are null .

Method Detail

implies

public boolean implies(Permission p)

Determines if a CapabilityPermission object "implies" the specified permission.

Overrides:

implies in class BasicPermission

Parameters:

p - The target permission to check.

Returns:

true if the specified permission is implied by this object; false otherwise.

getActions

public String getActions()

Returns the canonical string representation of the actions. Always returns present actions in the following order: require, provide.

Overrides:

getActions in class BasicPermission

Returns:

The canonical string representation of the actions.

newPermissionCollection

public PermissionCollection newPermissionCollection()

Returns a new PermissionCollection object for storing CapabilityPermission objects.

Overrides:

newPermissionCollection in class BasicPermission

Returns:

A new PermissionCollection object suitable for storing CapabilityPermission objects.

equals

public boolean equals(Object obj)

Determines the equality of two CapabilityPermission objects. Checks that specified object has the same name and action as this CapabilityPermission.

Overrides:

equals in class BasicPermission

Parameters:

obj - The object to test for equality.

Returns:

true if obj is a CapabilityPermission, and has the same name and actions as this CapabilityPermission object; false otherwise.

hashCode

public int hashCode()

Returns the hash code value for this object.

Overrides:

hashCode in class BasicPermission

Returns:

Hash code value for this object.