public class Util extends Object
Constructor and Description |
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Util() |
Modifier and Type | Method and Description |
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static String |
base64Encode(String s) |
static String |
encode(byte[] in,
int len)
Encode a raw byte array to a Base64 String.
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static void |
encode(InputStream in,
OutputStream out,
int len) |
static long |
getBundleIdFromModuleId(String id)
Converts a module identifier to a bundle identifier.
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static String |
getClassName(String className) |
static String |
getClassPackage(String className) |
static String |
getDefaultProperty(String name) |
static int |
getModuleRevisionFromModuleId(String id)
Converts a module identifier to a bundle identifier.
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static String |
getResourcePackage(String resource) |
static boolean |
isServiceAssignable(org.osgi.framework.Bundle requester,
org.osgi.framework.ServiceReference ref)
This method determines if the requesting bundle is able to cast the
specified service reference based on class visibility rules of the
underlying modules.
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static Class |
loadClassUsingClass(Class clazz,
String name)
This is a simple utility class that attempts to load the named class
using the class loader of the supplied class or the class loader of one
of its super classes or their implemented interfaces.
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static String |
substVars(String val,
String currentKey,
Map cycleMap,
Properties configProps)
This method performs property variable substitution on the specified
value.
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public static long getBundleIdFromModuleId(String id)
public static int getModuleRevisionFromModuleId(String id)
public static Class loadClassUsingClass(Class clazz, String name)
This is a simple utility class that attempts to load the named class using the class loader of the supplied class or the class loader of one of its super classes or their implemented interfaces. This is necessary during service registration to test whether a given service object implements its declared service interfaces.
To perform this test, the framework must try to load the classes associated with the declared service interfaces, so it must choose a class loader. The class loader of the registering bundle cannot be used, since this disallows third parties to register service on behalf of another bundle. Consequently, the class loader of the service object must be used. However, this is also not sufficient since the class loader of the service object may not have direct access to the class in question.
The service object's class loader may not have direct access to its service interface if it extends a super class from another bundle which implements the service interface from an imported bundle or if it implements an extension of the service interface from another bundle which imports the base interface from another bundle. In these cases, the service object's class loader only has access to the super class's class or the extended service interface, respectively, but not to the actual service interface.
Thus, it is necessary to not only try to load the service interface class from the service object's class loader, but from the class loaders of any interfaces it implements and the class loaders of all super classes.
svcObj
- the class that is the root of the search.name
- the name of the class to load.public static boolean isServiceAssignable(org.osgi.framework.Bundle requester, org.osgi.framework.ServiceReference ref)
requester
- The bundle requesting the service.ref
- The service in question.public static String base64Encode(String s) throws IOException
IOException
public static String encode(byte[] in, int len) throws IOException
in
- Byte array to encode.len
- Length of Base64 lines. 0 means no line breaks.IOException
public static void encode(InputStream in, OutputStream out, int len) throws IOException
IOException
public static String substVars(String val, String currentKey, Map cycleMap, Properties configProps) throws IllegalArgumentException
This method performs property variable substitution on the specified value. If the specified value contains the syntax ${<prop-name>}, where <prop-name> refers to either a configuration property or a system property, then the corresponding property value is substituted for the variable placeholder. Multiple variable placeholders may exist in the specified value as well as nested variable placeholders, which are substituted from inner most to outer most. Configuration properties override system properties.
val
- The string on which to perform property substitution.currentKey
- The key of the property being evaluated used to detect cycles.cycleMap
- Map of variable references used to detect nested cycles.configProps
- Set of configuration properties.IllegalArgumentException
- If there was a syntax error in the property placeholder
syntax or a recursive variable reference.Copyright © 2006-2015 The Apache Software Foundation. All Rights Reserved.