org.apache.felix.ipojo.util

Class DependencyMetadataHelper

java.lang.Object

org.apache.felix.ipojo.util.DependencyMetadataHelper

public class DependencyMetadataHelper
extends java.lang.Object

A set of methods to simplify the parsing of dependency attributes.

Constructor Summary

Constructors

Constructor and Description
DependencyMetadataHelper()

Method Summary

Modifier and Type	Method and Description
static java.util.Comparator	getComparator(org.apache.felix.ipojo.metadata.Element dep, org.osgi.framework.BundleContext context) Helper method parsing the comparator attribute and returning the comparator object.
static int	getPolicy(org.apache.felix.ipojo.metadata.Element dep) Helper method parsing the binding policy.
static java.lang.Class	loadSpecification(java.lang.String specification, org.osgi.framework.BundleContext context) Loads the given specification class.

Methods inherited from class java.lang.Object

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

Constructor Detail

DependencyMetadataHelper

public DependencyMetadataHelper()

Method Detail

getComparator

public static java.util.Comparator getComparator(org.apache.felix.ipojo.metadata.Element dep,
                                                 org.osgi.framework.BundleContext context)
                                          throws ConfigurationException

Helper method parsing the comparator attribute and returning the comparator object. If the 'comparator' attribute is not set, this method returns null. If the 'comparator' attribute is set to 'osgi', this method returns the normal OSGi comparator. In other case, it tries to create an instance of the declared comparator class.

Parameters:

dep - the Element describing the dependency

context - the bundle context (to load the comparator class)

Returns:

the comparator object, null if not set.

Throws:

ConfigurationException - the comparator class cannot be load or the comparator cannot be instantiated correctly.

loadSpecification

public static java.lang.Class loadSpecification(java.lang.String specification,
                                                org.osgi.framework.BundleContext context)
                                         throws ConfigurationException

Loads the given specification class.

Parameters:

specification - the specification class name to load

context - the bundle context

Returns:

the class object for the given specification

Throws:

ConfigurationException - if the class cannot be loaded correctly.

getPolicy

public static int getPolicy(org.apache.felix.ipojo.metadata.Element dep)
                     throws ConfigurationException

Helper method parsing the binding policy. If the 'policy' attribute is not set in the dependency, the method returns the 'DYNAMIC BINDING POLICY'. Accepted policy values are : dynamic, dynamic-priority and static.

Parameters:

dep - the Element describing the dependency

Returns:

the policy attached to this dependency

Throws:

ConfigurationException - if an unknown binding policy was described.