Package org.osgi.framework

Interface Bundle

  • All Superinterfaces:
    Comparable<Bundle>
    All Known Subinterfaces:
    Framework
    @ProviderType
public interface Bundle
extends Comparable<Bundle>
    An installed bundle in the Framework.

    A Bundle object is the access point to define the lifecycle of an installed bundle. Each bundle installed in the OSGi environment must have an associated Bundle object.

    A bundle must have a unique identity, a long, chosen by the Framework. This identity must not change during the lifecycle of a bundle, even when the bundle is updated. Uninstalling and then reinstalling the bundle must create a new unique identity.

    A bundle can be in one of six states:

    Values assigned to these states have no specified ordering; they represent bit values that may be ORed together to determine if a bundle is in one of the valid states.

    A bundle should only have active threads of execution when its state is one of STARTING,ACTIVE, or STOPPING. An UNINSTALLED bundle can not be set to another state; it is a zombie and can only be reached because references are kept somewhere.

    The Framework is the only entity that is allowed to create Bundle objects, and these objects are only valid within the Framework that created them.

    Bundles have a natural ordering such that if two Bundles have the same bundle id they are equal. A Bundle is less than another Bundle if it has a lower bundle id and is greater if it has a higher bundle id.

    • Field Detail

      • UNINSTALLED

        static final int UNINSTALLED
        The bundle is uninstalled and may not be used.

        The UNINSTALLED state is only visible after a bundle is uninstalled; the bundle is in an unusable state but references to the Bundle object may still be available and used for introspection.

        The value of UNINSTALLED is 0x00000001.

        See Also:
        Constant Field Values

      • INSTALLED

        static final int INSTALLED
        The bundle is installed but not yet resolved.

        A bundle is in the INSTALLED state when it has been installed in the Framework but is not or cannot be resolved.

        This state is visible if the bundle's code dependencies are not resolved. The Framework may attempt to resolve an INSTALLED bundle's code dependencies and move the bundle to the RESOLVED state.

        The value of INSTALLED is 0x00000002.

        See Also:
        Constant Field Values

      • RESOLVED

        static final int RESOLVED
        The bundle is resolved and is able to be started.

        A bundle is in the RESOLVED state when the Framework has successfully resolved the bundle's code dependencies. These dependencies include:

        Note that the bundle is not active yet. A bundle must be put in the RESOLVED state before it can be started. The Framework may attempt to resolve a bundle at any time.

        The value of RESOLVED is 0x00000004.

        See Also:
        Constant Field Values

      • STARTING

        static final int STARTING
        The bundle is in the process of starting.

        A bundle is in the STARTING state when its start method is active. A bundle must be in this state when the bundle's BundleActivator.start(BundleContext) is called. If the BundleActivator.start method completes without exception, then the bundle has successfully started and must move to the ACTIVE state.

        If the bundle has a lazy activation policy, then the bundle may remain in this state for some time until the activation is triggered.

        The value of STARTING is 0x00000008.

        See Also:
        Constant Field Values

      • STOPPING

        static final int STOPPING
        The bundle is in the process of stopping.

        A bundle is in the STOPPING state when its stop method is active. A bundle must be in this state when the bundle's BundleActivator.stop(BundleContext) method is called. When the BundleActivator.stop method completes the bundle is stopped and must move to the RESOLVED state.

        The value of STOPPING is 0x00000010.

        See Also:
        Constant Field Values

      • ACTIVE

        static final int ACTIVE
        The bundle is now running.

        A bundle is in the ACTIVE state when it has been successfully started and activated.

        The value of ACTIVE is 0x00000020.

        See Also:
        Constant Field Values

      • START_TRANSIENT

        static final int START_TRANSIENT
        The bundle start operation is transient and the persistent autostart setting of the bundle is not modified.

        This bit may be set when calling start(int) to notify the framework that the autostart setting of the bundle must not be modified. If this bit is not set, then the autostart setting of the bundle is modified.

        Since:
        1.4
        See Also:
        start(int), Constant Field Values

      • STOP_TRANSIENT

        static final int STOP_TRANSIENT
        The bundle stop is transient and the persistent autostart setting of the bundle is not modified.

        This bit may be set when calling stop(int) to notify the framework that the autostart setting of the bundle must not be modified. If this bit is not set, then the autostart setting of the bundle is modified.

        Since:
        1.4
        See Also:
        stop(int), Constant Field Values

    • Method Detail

      • getState

        int getState()
        Returns this bundle's current state.

        A bundle can be in only one state at any time.

        Returns:
        An element of UNINSTALLED,INSTALLED, RESOLVED, STARTING, STOPPING, ACTIVE.

      • start

        void start​(int options)
    throws BundleException
        Starts this bundle.

        If this bundle's state is UNINSTALLED then an IllegalStateException is thrown.

        If the current start level is less than this bundle's start level:

        • If the START_TRANSIENT option is set, then a BundleException is thrown indicating this bundle cannot be started due to the Framework's current start level.
        • Otherwise, the Framework must set this bundle's persistent autostart setting to Started with declared activation if the START_ACTIVATION_POLICY option is set or Started with eager activation if not set.

        When the Framework's current start level becomes equal to or more than this bundle's start level, this bundle will be started.

        Otherwise, the following steps are required to start this bundle:

        1. If this bundle is in the process of being activated or deactivated then this method must wait for activation or deactivation to complete before continuing. If this does not occur in a reasonable time, a BundleException is thrown to indicate this bundle was unable to be started.
        2. If the START_TRANSIENT option is not set then set this bundle's autostart setting to Started with declared activation if the START_ACTIVATION_POLICY option is set or Started with eager activation if not set. When the Framework is restarted and this bundle's autostart setting is not Stopped, this bundle must be automatically started.
        3. If this bundle's state is ACTIVE then this method returns immediately.
        4. If this bundle's state is not RESOLVED, an attempt is made to resolve this bundle. If the Framework cannot resolve this bundle, a BundleException is thrown.
        5. If the START_ACTIVATION_POLICY option is set and this bundle's declared activation policy is lazy then:
          • If this bundle's state is STARTING then this method returns immediately.
          • This bundle's state is set to STARTING.
          • A bundle event of type BundleEvent.LAZY_ACTIVATION is fired.
          • This method returns immediately and the remaining steps will be followed when this bundle's activation is later triggered.
        6. This bundle's state is set to STARTING.
        7. A bundle event of type BundleEvent.STARTING is fired.
        8. The BundleActivator.start(BundleContext) method of this bundle's BundleActivator, if one is specified, is called. If the BundleActivator is invalid or throws an exception then:
          • This bundle's state is set to STOPPING.
          • A bundle event of type BundleEvent.STOPPING is fired.
          • Any services registered by this bundle must be unregistered.
          • Any services used by this bundle must be released.
          • Any listeners registered by this bundle must be removed.
          • This bundle's state is set to RESOLVED.
          • A bundle event of type BundleEvent.STOPPED is fired.
          • A BundleException is then thrown.
        9. This bundle's state is set to ACTIVE.
        10. A bundle event of type BundleEvent.STARTED is fired.
        Preconditions
        • getState() in { INSTALLED, RESOLVED } or { INSTALLED, RESOLVED, STARTING } if this bundle has a lazy activation policy.
        Postconditions, no exceptions thrown
        • Bundle autostart setting is modified unless the START_TRANSIENT option was set.
        • getState() in { ACTIVE } unless the lazy activation policy was used.
        • BundleActivator.start() has been called and did not throw an exception unless the lazy activation policy was used.
        Postconditions, when an exception is thrown
        • Depending on when the exception occurred, bundle autostart setting is modified unless the START_TRANSIENT option was set.
        • getState() not in { STARTING, ACTIVE }.
        Parameters:
        options - The options for starting this bundle. See START_TRANSIENT and START_ACTIVATION_POLICY. The Framework must ignore unrecognized options.
        Throws:
        BundleException - If this bundle could not be started. BundleException types thrown by this method include: BundleException.START_TRANSIENT_ERROR, BundleException.NATIVECODE_ERROR, BundleException.RESOLVE_ERROR, BundleException.STATECHANGE_ERROR, and BundleException.ACTIVATOR_ERROR.
        IllegalStateException - If this bundle has been uninstalled or this bundle tries to change its own state.
        SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.
        Since:
        1.4

      • stop

        void stop​(int options)
   throws BundleException
        Stops this bundle.

        The following steps are required to stop a bundle:

        1. If this bundle's state is UNINSTALLED then an IllegalStateException is thrown.
        2. If this bundle is in the process of being activated or deactivated then this method must wait for activation or deactivation to complete before continuing. If this does not occur in a reasonable time, a BundleException is thrown to indicate this bundle was unable to be stopped.
        3. If the STOP_TRANSIENT option is not set then set this bundle's persistent autostart setting to Stopped. When the Framework is restarted and this bundle's autostart setting is Stopped, this bundle must not be automatically started.
        4. If this bundle's state is not STARTING or ACTIVE then this method returns immediately.
        5. This bundle's state is set to STOPPING.
        6. A bundle event of type BundleEvent.STOPPING is fired.
        7. If this bundle's state was ACTIVE prior to setting the state to STOPPING, the BundleActivator.stop(BundleContext) method of this bundle's BundleActivator, if one is specified, is called. If that method throws an exception, this method must continue to stop this bundle and a BundleException must be thrown after completion of the remaining steps.
        8. Any services registered by this bundle must be unregistered.
        9. Any services used by this bundle must be released.
        10. Any listeners registered by this bundle must be removed.
        11. If this bundle's state is UNINSTALLED, because this bundle was uninstalled while the BundleActivator.stop method was running, a BundleException must be thrown.
        12. This bundle's state is set to RESOLVED.
        13. A bundle event of type BundleEvent.STOPPED is fired.
        Preconditions
        • getState() in { ACTIVE }.
        Postconditions, no exceptions thrown
        • Bundle autostart setting is modified unless the STOP_TRANSIENT option was set.
        • getState() not in { ACTIVE, STOPPING }.
        • BundleActivator.stop has been called and did not throw an exception.
        Postconditions, when an exception is thrown
        • Bundle autostart setting is modified unless the STOP_TRANSIENT option was set.
        Parameters:
        options - The options for stopping this bundle. See STOP_TRANSIENT. The Framework must ignore unrecognized options.
        Throws:
        BundleException - BundleException types thrown by this method include: BundleException.STATECHANGE_ERROR and BundleException.ACTIVATOR_ERROR.
        IllegalStateException - If this bundle has been uninstalled or this bundle tries to change its own state.
        SecurityException - If the caller does not have the appropriate AdminPermission[this,EXECUTE], and the Java Runtime Environment supports permissions.
        Since:
        1.4

      • update

        void update​(InputStream input)
     throws BundleException
        Updates this bundle from an InputStream.

        If the specified InputStream is null, the Framework must create the InputStream from which to read the updated bundle by interpreting, in an implementation dependent manner, this bundle's Bundle-UpdateLocation Manifest header, if present, or this bundle's original location.

        If this bundle's state is ACTIVE, it must be stopped before the update and started after the update successfully completes.

        If this bundle has exported any packages that are imported by another bundle, these packages must remain exported until the FrameworkWiring.refreshBundles method has been has been called or the Framework is relaunched.

        The following steps are required to update a bundle:

        1. If this bundle's state is UNINSTALLED then an IllegalStateException is thrown.
        2. If this bundle's state is ACTIVE, STARTING or STOPPING, this bundle is stopped as described in the Bundle.stop method. If Bundle.stop throws an exception, the exception is rethrown terminating the update.
        3. The updated version of this bundle is read from the input stream and installed. If the Framework is unable to install the updated version of this bundle, the original version of this bundle must be restored and a BundleException must be thrown after completion of the remaining steps.
        4. This bundle's state is set to INSTALLED.
        5. If the updated version of this bundle was successfully installed, a bundle event of type BundleEvent.UPDATED is fired.
        6. If this bundle's state was originally ACTIVE, the updated bundle is started as described in the Bundle.start method. If Bundle.start throws an exception, a Framework event of type FrameworkEvent.ERROR is fired containing the exception.
        Preconditions
        • getState() not in { UNINSTALLED }.
        Postconditions, no exceptions thrown
        • getState() in { INSTALLED, RESOLVED, ACTIVE }.
        • This bundle has been updated.
        Postconditions, when an exception is thrown
        • getState() in { INSTALLED, RESOLVED, ACTIVE }.
        • Original bundle is still used; no update occurred.
        Parameters:
        input - The InputStream from which to read the new bundle or null to indicate the Framework must create the input stream from this bundle's Bundle-UpdateLocation Manifest header, if present, or this bundle's original location. The input stream must always be closed when this method completes, even if an exception is thrown.
        Throws:
        BundleException - If this bundle could not be updated. BundleException types thrown by this method include: BundleException.READ_ERROR, BundleException.DUPLICATE_BUNDLE_ERROR, BundleException.MANIFEST_ERROR, BundleException.NATIVECODE_ERROR, BundleException.RESOLVE_ERROR, BundleException.STATECHANGE_ERROR, and BundleException.ACTIVATOR_ERROR.
        IllegalStateException - If this bundle has been uninstalled or this bundle tries to change its own state.
        SecurityException - If the caller does not have the appropriate AdminPermission[this,LIFECYCLE] for both the current bundle and the updated bundle, and the Java Runtime Environment supports permissions.
        See Also:
        stop(), start()

      • uninstall

        void uninstall()
        throws BundleException
        Uninstalls this bundle.

        This method causes the Framework to notify other bundles that this bundle is being uninstalled, and then puts this bundle into the UNINSTALLED state. The Framework must remove any resources related to this bundle that it is able to remove.

        If this bundle has exported any packages, the Framework must continue to make these packages available to their importing bundles until the FrameworkWiring.refreshBundles method has been called or the Framework is relaunched.

        The following steps are required to uninstall a bundle:

        1. If this bundle's state is UNINSTALLED then an IllegalStateException is thrown.
        2. If this bundle's state is ACTIVE, STARTING or STOPPING, this bundle is stopped as described in the Bundle.stop method. If Bundle.stop throws an exception, a Framework event of type FrameworkEvent.ERROR is fired containing the exception.
        3. This bundle's state is set to UNINSTALLED.
        4. A bundle event of type BundleEvent.UNINSTALLED is fired.
        5. This bundle and any persistent storage area provided for this bundle by the Framework are removed.
        Preconditions
        • getState() not in { UNINSTALLED }.
        Postconditions, no exceptions thrown
        • getState() in { UNINSTALLED }.
        • This bundle has been uninstalled.
        Postconditions, when an exception is thrown
        • getState() not in { UNINSTALLED }.
        • This Bundle has not been uninstalled.
        Throws:
        BundleException - If the uninstall failed. This can occur if another thread is attempting to change this bundle's state and does not complete in a timely manner. BundleException types thrown by this method include: BundleException.STATECHANGE_ERROR
        IllegalStateException - If this bundle has been uninstalled or this bundle tries to change its own state.
        SecurityException - If the caller does not have the appropriate AdminPermission[this,LIFECYCLE], and the Java Runtime Environment supports permissions.
        See Also:
        stop()

      • getHeaders

        Dictionary<String,​String> getHeaders()
        Returns this bundle's Manifest headers and values. This method returns all the Manifest headers and values from the main section of this bundle's Manifest file; that is, all lines prior to the first blank line.

        Manifest header names are case-insensitive. The methods of the returned Dictionary object must operate on header names in a case-insensitive manner. If a Manifest header value starts with "%", it must be localized according to the default locale. If no localization is found for a header value, the header value without the leading "%" is returned.

        For example, the following Manifest headers and values are included if they are present in the Manifest file: 

             Bundle-Name
     Bundle-Vendor
     Bundle-Version
     Bundle-Description
     Bundle-DocURL
     Bundle-ContactAddress

        This method must continue to return Manifest header information while this bundle is in the UNINSTALLED state.

        Returns:
        An unmodifiable Dictionary object containing this bundle's Manifest headers and values.
        Throws:
        SecurityException - If the caller does not have the appropriate AdminPermission[this,METADATA], and the Java Runtime Environment supports permissions.
        See Also:
        Constants.BUNDLE_LOCALIZATION

      • getBundleId

        long getBundleId()
        Returns this bundle's unique identifier. This bundle is assigned a unique identifier by the Framework when it was installed in the OSGi environment.

        A bundle's unique identifier has the following attributes:

        • Is unique and persistent.
        • Is a long.
        • Its value is not reused for another bundle, even after a bundle is uninstalled.
        • Does not change while a bundle remains installed.
        • Does not change when a bundle is updated.

        This method must continue to return this bundle's unique identifier while this bundle is in the UNINSTALLED state.

        Returns:
        The unique identifier of this bundle.

      • getLocation

        String getLocation()
        Returns this bundle's location identifier.

        The location identifier is the location passed to BundleContext.installBundle when a bundle is installed. The location identifier does not change while this bundle remains installed, even if this bundle is updated.

        This method must continue to return this bundle's location identifier while this bundle is in the UNINSTALLED state.

        Returns:
        The string representation of this bundle's location identifier.
        Throws:
        SecurityException - If the caller does not have the appropriate AdminPermission[this,METADATA], and the Java Runtime Environment supports permissions.

      • getRegisteredServices

        ServiceReference<?>[] getRegisteredServices()
        Returns this bundle's ServiceReference list for all services it has registered or null if this bundle has no registered services.

        If the Java runtime supports permissions, a ServiceReference object to a service is included in the returned list only if the caller has the ServicePermission to get the service using at least one of the named classes the service was registered under.

        The list is valid at the time of the call to this method, however, as the Framework is a very dynamic environment, services can be modified or unregistered at anytime.

        Returns:
        An array of ServiceReference objects or null.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        See Also:
        ServiceRegistration, ServiceReference, ServicePermission

      • getServicesInUse

        ServiceReference<?>[] getServicesInUse()
        Returns this bundle's ServiceReference list for all services it is using or returns null if this bundle is not using any services. A bundle is considered to be using a service if it has any unreleased service objects.

        If the Java Runtime Environment supports permissions, a ServiceReference object to a service is included in the returned list only if the caller has the ServicePermission to get the service using at least one of the named classes the service was registered under.

        The list is valid at the time of the call to this method, however, as the Framework is a very dynamic environment, services can be modified or unregistered at anytime.

        Returns:
        An array of ServiceReference objects or null.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        See Also:
        ServiceReference, ServicePermission

      • hasPermission

        boolean hasPermission​(Object permission)
        Determines if this bundle has the specified permissions.

        If the Java Runtime Environment does not support permissions, this method always returns true.

        permission is of type Object to avoid referencing the java.security.Permission class directly. This is to allow the Framework to be implemented in Java environments which do not support permissions.

        If the Java Runtime Environment does support permissions, this bundle and all its resources including embedded JAR files, belong to the same java.security.ProtectionDomain; that is, they must share the same set of permissions.

        Parameters:
        permission - The permission to verify.
        Returns:
        true if this bundle has the specified permission or the permissions possessed by this bundle imply the specified permission; false if this bundle does not have the specified permission or permission is not an instanceof java.security.Permission.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.

      • getResource

        URL getResource​(String name)
        Find the specified resource from this bundle's class loader. This bundle's class loader is called to search for the specified resource. If this bundle's state is INSTALLED, this method must attempt to resolve this bundle before attempting to get the specified resource. If this bundle cannot be resolved, then only this bundle must be searched for the specified resource. Imported packages cannot be searched when this bundle has not been resolved. If this bundle is a fragment bundle then null is returned.

        Note: Jar and zip files are not required to include directory entries. URLs to directory entries will not be returned if the bundle contents do not contain directory entries.

        Parameters:
        name - The name of the resource. See ClassLoader.getResource for a description of the format of a resource name.
        Returns:
        A URL to the named resource, or null if the resource could not be found or if this bundle is a fragment bundle or if the caller does not have the appropriate AdminPermission[this,RESOURCE], and the Java Runtime Environment supports permissions.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.1
        See Also:
        getEntry(String), findEntries(String, String, boolean)

      • getHeaders

        Dictionary<String,​String> getHeaders​(String locale)
        Returns this bundle's Manifest headers and values localized to the specified locale.

        This method performs the same function as Bundle.getHeaders() except the manifest header values are localized to the specified locale.

        If a Manifest header value starts with "%", it must be localized according to the specified locale. If a locale is specified and cannot be found, then the header values must be returned using the default locale. Localizations are searched for in the following order: 

           bn + "_" + Ls + "_" + Cs + "_" + Vs
   bn + "_" + Ls + "_" + Cs
   bn + "_" + Ls
   bn + "_" + Ld + "_" + Cd + "_" + Vd
   bn + "_" + Ld + "_" + Cd
   bn + "_" + Ld
   bn
        Where bn is this bundle's localization basename, Ls, Cs and Vs are the specified locale (language, country, variant) and Ld, Cd and Vd are the default locale (language, country, variant). If null is specified as the locale string, the header values must be localized using the default locale. If the empty string ("") is specified as the locale string, the header values must not be localized and the raw (unlocalized) header values, including any leading "%", must be returned. If no localization is found for a header value, the header value without the leading "%" is returned.

        This method must continue to return Manifest header information while this bundle is in the UNINSTALLED state, however the header values must only be available in the raw and default locale values.

        Parameters:
        locale - The locale name into which the header values are to be localized. If the specified locale is null then the locale returned by java.util.Locale.getDefault is used. If the specified locale is the empty string, this method will return the raw (unlocalized) manifest headers including any leading "%".
        Returns:
        An unmodifiable Dictionary object containing this bundle's Manifest headers and values.
        Throws:
        SecurityException - If the caller does not have the appropriate AdminPermission[this,METADATA], and the Java Runtime Environment supports permissions.
        Since:
        1.3
        See Also:
        getHeaders(), Constants.BUNDLE_LOCALIZATION

      • getSymbolicName

        String getSymbolicName()
        Returns the symbolic name of this bundle as specified by its Bundle-SymbolicName manifest header. The bundle symbolic name should be based on the reverse domain name naming convention like that used for java packages.

        This method must continue to return this bundle's symbolic name while this bundle is in the UNINSTALLED state.

        Returns:
        The symbolic name of this bundle or null if this bundle does not have a symbolic name.
        Since:
        1.3

      • loadClass

        Class<?> loadClass​(String name)
            throws ClassNotFoundException
        Loads the specified class using this bundle's class loader.

        If this bundle is a fragment bundle then this method must throw a ClassNotFoundException.

        If this bundle's state is INSTALLED, this method must attempt to resolve this bundle before attempting to load the class.

        If this bundle cannot be resolved, a Framework event of type FrameworkEvent.ERROR is fired containing a BundleException with details of the reason this bundle could not be resolved. This method must then throw a ClassNotFoundException.

        If this bundle's state is UNINSTALLED, then an IllegalStateException is thrown.

        Parameters:
        name - The name of the class to load.
        Returns:
        The Class object for the requested class.
        Throws:
        ClassNotFoundException - If no such class can be found or if this bundle is a fragment bundle or if the caller does not have the appropriate AdminPermission[this,CLASS], and the Java Runtime Environment supports permissions.
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.3

      • getResources

        Enumeration<URL> getResources​(String name)
                       throws IOException
        Find the specified resources from this bundle's class loader. This bundle's class loader is called to search for the specified resources. If this bundle's state is INSTALLED, this method must attempt to resolve this bundle before attempting to get the specified resources. If this bundle cannot be resolved, then only this bundle must be searched for the specified resources. Imported packages cannot be searched when a bundle has not been resolved. If this bundle is a fragment bundle then null is returned.

        Note: Jar and zip files are not required to include directory entries. URLs to directory entries will not be returned if the bundle contents do not contain directory entries.

        Parameters:
        name - The name of the resource. See ClassLoader.getResources for a description of the format of a resource name.
        Returns:
        An enumeration of URLs to the named resources, or null if the resource could not be found or if this bundle is a fragment bundle or if the caller does not have the appropriate AdminPermission[this,RESOURCE], and the Java Runtime Environment supports permissions.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        IOException - If there is an I/O error.
        Since:
        1.3

      • getEntryPaths

        Enumeration<String> getEntryPaths​(String path)
        Returns an Enumeration of all the paths (String objects) to entries within this bundle whose longest sub-path matches the specified path. This bundle's class loader is not used to search for entries. Only the contents of this bundle are searched.

        The specified path is always relative to the root of this bundle and may begin with a "/". A path value of "/" indicates the root of this bundle.

        Returned paths indicating subdirectory paths end with a "/". The returned paths are all relative to the root of this bundle and must not begin with "/".

        Note: Jar and zip files are not required to include directory entries. Paths to directory entries will not be returned if the bundle contents do not contain directory entries.

        Parameters:
        path - The path name for which to return entry paths.
        Returns:
        An Enumeration of the entry paths (String objects) or null if no entry could be found or if the caller does not have the appropriate AdminPermission[this,RESOURCE] and the Java Runtime Environment supports permissions.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.3

      • getEntry

        URL getEntry​(String path)
        Returns a URL to the entry at the specified path in this bundle. This bundle's class loader is not used to search for the entry. Only the contents of this bundle are searched for the entry.

        The specified path is always relative to the root of this bundle and may begin with "/". A path value of "/" indicates the root of this bundle.

        Note: Jar and zip files are not required to include directory entries. URLs to directory entries will not be returned if the bundle contents do not contain directory entries.

        Parameters:
        path - The path name of the entry.
        Returns:
        A URL to the entry, or null if no entry could be found or if the caller does not have the appropriate AdminPermission[this,RESOURCE] and the Java Runtime Environment supports permissions.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.3

      • getLastModified

        long getLastModified()
        Returns the time when this bundle was last modified. A bundle is considered to be modified when it is installed, updated or uninstalled.

        The time value is the number of milliseconds since January 1, 1970, 00:00:00 UTC.

        Returns:
        The time when this bundle was last modified.
        Since:
        1.3

      • findEntries

        Enumeration<URL> findEntries​(String path,
                             String filePattern,
                             boolean recurse)
        Returns entries in this bundle and its attached fragments. This bundle's class loader is not used to search for entries. Only the contents of this bundle and its attached fragments are searched for the specified entries. If this bundle's state is INSTALLED, this method must attempt to resolve this bundle before attempting to find entries.

        This method is intended to be used to obtain configuration, setup, localization and other information from this bundle. This method takes into account that the "contents" of this bundle can be extended with fragments. This "bundle space" is not a namespace with unique members; the same entry name can be present multiple times. This method therefore returns an enumeration of URL objects. These URLs can come from different JARs but have the same path name. This method can either return only entries in the specified path or recurse into subdirectories returning entries in the directory tree beginning at the specified path. Fragments can be attached after this bundle is resolved, possibly changing the set of URLs returned by this method. If this bundle is not resolved, only the entries in the JAR file of this bundle are returned.

        Examples: 

         // List all XML files in the OSGI-INF directory and below
 Enumeration e = b.findEntries("OSGI-INF", "*.xml", true);
 
 // Find a specific localization file
 Enumeration e = b.findEntries("OSGI-INF/l10n",
     "bundle_nl_DU.properties", false);
 if (e.hasMoreElements())
     return (URL) e.nextElement();

        URLs for directory entries must have their path end with "/".

        Note: Jar and zip files are not required to include directory entries. URLs to directory entries will not be returned if the bundle contents do not contain directory entries.

        Parameters:
        path - The path name in which to look. The path is always relative to the root of this bundle and may begin with "/". A path value of "/" indicates the root of this bundle.
        filePattern - The file name pattern for selecting entries in the specified path. The pattern is only matched against the last element of the entry path. If the entry is a directory then the trailing "/" is not used for pattern matching. Substring matching is supported, as specified in the Filter specification, using the wildcard character ("*"). If null is specified, this is equivalent to "*" and matches all files.
        recurse - If true, recurse into subdirectories. Otherwise only return entries from the specified path.
        Returns:
        An enumeration of URL objects for each matching entry, or null if no matching entry could be found or if the caller does not have the appropriate AdminPermission[this,RESOURCE], and the Java Runtime Environment supports permissions. The URLs are sorted such that entries from this bundle are returned first followed by the entries from attached fragments in attachment order. If this bundle is a fragment, then only matching entries in this fragment are returned.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.3

      • getBundleContext

        BundleContext getBundleContext()
        Returns this bundle's BundleContext. The returned BundleContext can be used by the caller to act on behalf of this bundle.

        If this bundle is not in the STARTING, ACTIVE, or STOPPING states or this bundle is a fragment bundle, then this bundle has no valid BundleContext. This method will return null if this bundle has no valid BundleContext.

        Returns:
        A BundleContext for this bundle or null if this bundle has no valid BundleContext.
        Throws:
        SecurityException - If the caller does not have the appropriate AdminPermission[this,CONTEXT], and the Java Runtime Environment supports permissions.
        Since:
        1.4

      • getSignerCertificates

        Map<X509Certificate,​List<X509Certificate>> getSignerCertificates​(int signersType)
        Return the certificates for the signers of this bundle and the certificate chains for those signers.
        Parameters:
        signersType - If SIGNERS_ALL is specified, then information on all signers of this bundle is returned. If SIGNERS_TRUSTED is specified, then only information on the signers of this bundle trusted by the framework is returned.
        Returns:
        The X509Certificates for the signers of this bundle and the X509Certificate chains for those signers. The keys of the Map are the X509Certificates of the signers of this bundle. The value for a key is a List containing the X509Certificate chain for the signer. The first item in the List is the signer's X509Certificate which is then followed by the rest of the X509Certificate chain. The returned Map will be empty if there are no signers. The returned Map is the property of the caller who is free to modify it.
        Throws:
        IllegalArgumentException - If the specified signersType is not SIGNERS_ALL or SIGNERS_TRUSTED.
        Since:
        1.5

      • getVersion

        Version getVersion()
        Returns the version of this bundle as specified by its Bundle-Version manifest header. If this bundle does not have a specified version then Version.emptyVersion is returned.

        This method must continue to return this bundle's version while this bundle is in the UNINSTALLED state.

        Returns:
        The version of this bundle.
        Since:
        1.5

      • adapt

        <A> A adapt​(Class<A> type)
        Adapt this bundle to the specified type.

        Adapting this bundle to the specified type may require certain checks, including security checks, to succeed. If a check does not succeed, then this bundle cannot be adapted and null is returned.

        Type Parameters:
        A - The type to which this bundle is to be adapted.
        Parameters:
        type - Class object for the type to which this bundle is to be adapted.
        Returns:
        The object, of the specified type, to which this bundle has been adapted or null if this bundle cannot be adapted to the specified type.
        Throws:
        SecurityException - If the caller does not have the appropriate AdaptPermission[type,this,ADAPT], and the Java Runtime Environment supports permissions.
        Since:
        1.6

      • getDataFile

        File getDataFile​(String filename)
        Creates a File object for a file in the persistent storage area provided for this bundle by the Framework. This method will return null if the platform does not have file system support or this bundle is a fragment bundle.

        A File object for the base directory of the persistent storage area provided for this bundle by the Framework can be obtained by calling this method with an empty string as filename.

        If the Java Runtime Environment supports permissions, the Framework will ensure that this bundle has the java.io.FilePermission with actions read,write,delete for all files (recursively) in the persistent storage area provided for this bundle.

        Parameters:
        filename - A relative name to the file to be accessed.
        Returns:
        A File object that represents the requested file or null if the platform does not have file system support or this bundle is a fragment bundle.
        Throws:
        IllegalStateException - If this bundle has been uninstalled.
        Since:
        1.6