org.glassfish.jersey.server.internal.scanning
Class PackageNamesScanner

java.lang.Object
  org.glassfish.jersey.server.internal.scanning.PackageNamesScanner

All Implemented Interfaces:

Iterator<String>, ResourceFinder

public class PackageNamesScanner
extends Object
implements ResourceFinder

A scanner that recursively scans URI-based resources present in a set of package names, and nested package names of that set. (Recursive scanning of nested packages can be disabled using a proper constructor.)

The URIs for a package name are obtained, by default, by invoking ClassLoader.getResources(java.lang.String) with the parameter that is the package name with "." replaced by "/".

Each URI is then scanned using a registered UriSchemeResourceFinderFactory that supports the URI scheme.

The following are registered by default. The FileSchemeResourceFinderFactory for "file" URI schemes. The JarZipSchemeResourceFinderFactory for "jar" or "zip" URI schemes to jar resources. The VfsSchemeResourceFinderFactory for the JBoss-based "vfsfile" and "vfszip" URI schemes.

Further schemes may be registered by registering an implementation of UriSchemeResourceFinderFactory in the META-INF/services file whose name is the the fully qualified class name of UriSchemeResourceFinderFactory.

If a URI scheme is not supported a ResourceFinderException will be thrown and package scanning deployment will fail.

Author:

Paul Sandoz, Jakub Podlesak (jakub.podlesak at oracle.com)

Nested Class Summary

static class

PackageNamesScanner.ResourcesProvider Find resources with a given name and class loader.

Constructor Summary

PackageNamesScanner(ClassLoader classLoader, String[] packages, boolean recursive)
Scan a set of packages using the provided ClassLoader.

PackageNamesScanner(String[] packages, boolean recursive)
Scan a set of packages using a context ClassLoader.

Method Summary

boolean	hasNext()
String	next()
InputStream	open() Open current resource.
void	remove() This operation is not supported by ResourceFinder & throws UnsupportedOperationException when invoked.
void	reset() Reset the ResourceFinder instance.
static void	setResourcesProvider(PackageNamesScanner.ResourcesProvider provider) Set the PackageNamesScanner.ResourcesProvider implementation to find resources.

Methods inherited from class java.lang.Object

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

Constructor Detail

PackageNamesScanner

public PackageNamesScanner(String[] packages,
                           boolean recursive)

Scan a set of packages using a context ClassLoader. The recursive flag determines whether the packages will be scanned recursively together with their nested packages (true) or if only the specified packages shall be scanned (false).

Parameters:

packages - an array of package names.

recursive - if (true the packages will be scanned recursively together with any nested packages, if false only the explicitly listed packages will be scanned.

PackageNamesScanner

public PackageNamesScanner(ClassLoader classLoader,
                           String[] packages,
                           boolean recursive)

Scan a set of packages using the provided ClassLoader. The recursive flag determines whether the packages will be scanned recursively together with their nested packages (true) or if only the specified packages shall be scanned (false).

Parameters:

classLoader - the ClassLoader to load classes from.

packages - an array of package names.

recursive - if (true the packages will be scanned recursively together with any nested packages, if false only the explicitly listed packages will be scanned.

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<String>

next

public String next()

Specified by:

next in interface Iterator<String>

remove

public void remove()

Description copied from interface: ResourceFinder

This operation is not supported by ResourceFinder & throws UnsupportedOperationException when invoked.

Specified by:

remove in interface Iterator<String>

Specified by:

remove in interface ResourceFinder

open

public InputStream open()

Description copied from interface: ResourceFinder

Open current resource.

Specified by:

open in interface ResourceFinder

Returns:

input stream from which current resource can be loaded.

reset

public void reset()

Description copied from interface: ResourceFinder

Reset the ResourceFinder instance.

Upon calling this method the implementing class MUST reset its internal state to the initial state.

Specified by:

reset in interface ResourceFinder

setResourcesProvider

public static void setResourcesProvider(PackageNamesScanner.ResourcesProvider provider)
                                 throws SecurityException

Set the PackageNamesScanner.ResourcesProvider implementation to find resources.

This method should be invoked before any package scanning is performed otherwise the functionality method will be utilized.

Parameters:

provider - the resources provider.

Throws:

SecurityException - if the resources provider cannot be set.