org.osgi.framework.namespace
Class HostNamespace

java.lang.Object
  org.osgi.resource.Namespace
      org.osgi.framework.namespace.AbstractWiringNamespace
          org.osgi.framework.namespace.HostNamespace

public final class HostNamespace
extends AbstractWiringNamespace

Host Capability and Requirement Namespace.

This class defines the names for the attributes and directives for this namespace. All unspecified capability attributes are of type String and are used as arbitrary matching attributes for the capability. The values associated with the specified directive and attribute keys are of type String, unless otherwise indicated.

Unless otherwise noted, all directives specified on the Bundle-SymbolicName header are visible in the capability and all directives specified on the Fragment-Host header are visible in the requirement.

• The uses directive must be ignored. A uses directive specified on the Bundle-SymbolicName header must be ignored. A uses directive must not be present in the capability.
• The effective directives must be ignored. This namespace is only effective at resolve time. An effective directive specified on the Bundle-SymbolicName or Fragment-Host headers must be ignored. An effective directive must not be present in a capability or requirement.
• The cardinality directive has limited applicability to this namespace. A cardinality directive specified on the Fragment-Host header must be ignored. All requirements must have the cardinality directive set to multiple.

A non-fragment resource with the with the osgi.bundle type identity provides zero or one^† host capabilities. A fragment resource with the osgi.fragment type identity must not declare a host capability and must declare exactly one host requirement.

† A resource with no bundle symbolic name must not provide a host capability.

"Immutable"

Field Summary

static String	CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE The capability directive identifying if and when a fragment may attach to a host bundle.
static String	CAPABILITY_SINGLETON_DIRECTIVE The capability directive identifying if the resource is a singleton.
static String	EXTENSION_BOOTCLASSPATH The directive value indicating that the extension fragment is to be loaded by the boot class loader.
static String	EXTENSION_FRAMEWORK The directive value indicating that the extension fragment is to be loaded by the framework's class loader.
static String	FRAGMENT_ATTACHMENT_ALWAYS The directive value indicating that fragments are allowed to attach to the host bundle at any time (while the host is resolved or during the process of resolving the host bundle).
static String	FRAGMENT_ATTACHMENT_NEVER The directive value indicating that no fragments are allowed to attach to the host bundle at any time.
static String	FRAGMENT_ATTACHMENT_RESOLVETIME The directive value indicating that fragments are allowed to attach to the host bundle only during the process of resolving the host bundle.
static String	HOST_NAMESPACE Namespace name for host capabilities and requirements.
static String	REQUIREMENT_EXTENSION_DIRECTIVE The requirement directive used to specify the type of the extension fragment.
static String	REQUIREMENT_VISIBILITY_DIRECTIVE The requirement directive used to specify the visibility type for a requirement.

Fields inherited from class org.osgi.framework.namespace.AbstractWiringNamespace

CAPABILITY_BUNDLE_VERSION_ATTRIBUTE, CAPABILITY_MANDATORY_DIRECTIVE

Fields inherited from class org.osgi.resource.Namespace

CAPABILITY_EFFECTIVE_DIRECTIVE, CAPABILITY_USES_DIRECTIVE, CARDINALITY_MULTIPLE, CARDINALITY_SINGLE, EFFECTIVE_ACTIVE, EFFECTIVE_RESOLVE, REQUIREMENT_CARDINALITY_DIRECTIVE, REQUIREMENT_EFFECTIVE_DIRECTIVE, REQUIREMENT_FILTER_DIRECTIVE, REQUIREMENT_RESOLUTION_DIRECTIVE, RESOLUTION_MANDATORY, RESOLUTION_OPTIONAL

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

HOST_NAMESPACE

public static final String HOST_NAMESPACE

Namespace name for host capabilities and requirements.

Also, the capability attribute used to specify the symbolic name of the host.

See Also:

Constant Field Values

CAPABILITY_SINGLETON_DIRECTIVE

public static final String CAPABILITY_SINGLETON_DIRECTIVE

The capability directive identifying if the resource is a singleton. A String value of "true" indicates the resource is a singleton; any other value or null indicates the resource is not a singleton.

This directive should be examined using the identity namespace.

See Also:

IdentityNamespace.CAPABILITY_SINGLETON_DIRECTIVE, Constant Field Values

CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE

public static final String CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE

The capability directive identifying if and when a fragment may attach to a host bundle. The default value is always.

See Also:

FRAGMENT_ATTACHMENT_ALWAYS, FRAGMENT_ATTACHMENT_RESOLVETIME, FRAGMENT_ATTACHMENT_NEVER, Constant Field Values

FRAGMENT_ATTACHMENT_ALWAYS

public static final String FRAGMENT_ATTACHMENT_ALWAYS

The directive value indicating that fragments are allowed to attach to the host bundle at any time (while the host is resolved or during the process of resolving the host bundle).

See Also:

CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE, Constant Field Values

FRAGMENT_ATTACHMENT_RESOLVETIME

public static final String FRAGMENT_ATTACHMENT_RESOLVETIME

The directive value indicating that fragments are allowed to attach to the host bundle only during the process of resolving the host bundle.

See Also:

CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE, Constant Field Values

FRAGMENT_ATTACHMENT_NEVER

public static final String FRAGMENT_ATTACHMENT_NEVER

The directive value indicating that no fragments are allowed to attach to the host bundle at any time.

See Also:

CAPABILITY_FRAGMENT_ATTACHMENT_DIRECTIVE, Constant Field Values

REQUIREMENT_EXTENSION_DIRECTIVE

public static final String REQUIREMENT_EXTENSION_DIRECTIVE

The requirement directive used to specify the type of the extension fragment. The default value is framework.

See Also:

EXTENSION_FRAMEWORK, EXTENSION_BOOTCLASSPATH, Constant Field Values

EXTENSION_FRAMEWORK

public static final String EXTENSION_FRAMEWORK

The directive value indicating that the extension fragment is to be loaded by the framework's class loader.

See Also:

REQUIREMENT_EXTENSION_DIRECTIVE, Constant Field Values

EXTENSION_BOOTCLASSPATH

public static final String EXTENSION_BOOTCLASSPATH

The directive value indicating that the extension fragment is to be loaded by the boot class loader.

See Also:

REQUIREMENT_EXTENSION_DIRECTIVE, Constant Field Values

REQUIREMENT_VISIBILITY_DIRECTIVE

public static final String REQUIREMENT_VISIBILITY_DIRECTIVE

The requirement directive used to specify the visibility type for a requirement.

This directive should be examined using the bundle namespace.

See Also:

BundleNamespace.REQUIREMENT_VISIBILITY_DIRECTIVE, Constant Field Values