org.apache.camel.impl
Class DefaultPackageScanClassResolver

java.lang.Object
  org.apache.camel.support.ServiceSupport
      org.apache.camel.impl.DefaultPackageScanClassResolver

All Implemented Interfaces:

Service, ShutdownableService, PackageScanClassResolver, StatefulService, SuspendableService

Direct Known Subclasses:

WebSpherePackageScanClassResolver

public class DefaultPackageScanClassResolver
extends ServiceSupport
implements PackageScanClassResolver

Default implement of PackageScanClassResolver

Field Summary

protected org.slf4j.Logger

log

Fields inherited from class org.apache.camel.support.ServiceSupport

shutdown, shuttingdown, started, starting, stopped, stopping, suspended, suspending

Constructor Summary

DefaultPackageScanClassResolver()

Method Summary

void	addClassLoader(ClassLoader classLoader) Adds the class loader to the existing loaders
void	addFilter(PackageScanFilter filter) Add a filter that will be applied to all scan operations
protected void	addIfMatching(PackageScanFilter test, String fqn, Set<Class<?>> classes) Add the class designated by the fully qualified class name provided to the set of resolved classes if and only if it is approved by the Test supplied.
protected URL	customResourceLocator(URL url)
protected void	doStart() Implementations override this method to support customized start/stop.
protected void	doStop() Implementations override this method to support customized start/stop.
protected void	find(PackageScanFilter test, String packageName, ClassLoader loader, Set<Class<?>> classes)
protected void	find(PackageScanFilter test, String packageName, Set<Class<?>> classes)
Set<Class<?>>	findAnnotated(Class<? extends Annotation> annotation, String... packageNames) Attempts to discover classes that are annotated with to the annotation.
Set<Class<?>>	findAnnotated(Set<Class<? extends Annotation>> annotations, String... packageNames) Attempts to discover classes that are annotated with to the annotation.
Set<Class<?>>	findByFilter(PackageScanFilter filter, String... packageNames) Attempts to discover classes filter by the provided filter
Set<Class<?>>	findImplementations(Class<?> parent, String... packageNames) Attempts to discover classes that are assignable to the type provided.
Set<ClassLoader>	getClassLoaders() Gets the ClassLoader instances that should be used when scanning for classes.
protected Enumeration<URL>	getResources(ClassLoader loader, String packageName) Strategy to get the resources by the given classloader.
boolean	isAcceptableScheme(String urlPath)
void	removeFilter(PackageScanFilter filter) Removes the filter
void	setAcceptableSchemes(String schemes)
void	setClassLoaders(Set<ClassLoader> classLoaders) Sets the ClassLoader instances that should be used when scanning for classes.

Methods inherited from class org.apache.camel.support.ServiceSupport

doResume, doShutdown, doSuspend, getStatus, getVersion, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isStoppingOrStopped, isSuspended, isSuspending, resume, shutdown, start, stop, suspend

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final transient org.slf4j.Logger log

Constructor Detail

DefaultPackageScanClassResolver

public DefaultPackageScanClassResolver()

Method Detail

addClassLoader

public void addClassLoader(ClassLoader classLoader)

Description copied from interface: PackageScanClassResolver

Adds the class loader to the existing loaders

Specified by:

addClassLoader in interface PackageScanClassResolver

Parameters:

classLoader - the loader to add

addFilter

public void addFilter(PackageScanFilter filter)

Description copied from interface: PackageScanClassResolver

Add a filter that will be applied to all scan operations

Specified by:

addFilter in interface PackageScanClassResolver

Parameters:

filter - filter to filter desired classes in all scan operations

removeFilter

public void removeFilter(PackageScanFilter filter)

Description copied from interface: PackageScanClassResolver

Removes the filter

Specified by:

removeFilter in interface PackageScanClassResolver

Parameters:

filter - filter to filter desired classes in all scan operations

setAcceptableSchemes

public void setAcceptableSchemes(String schemes)

isAcceptableScheme

public boolean isAcceptableScheme(String urlPath)

getClassLoaders

public Set<ClassLoader> getClassLoaders()

Description copied from interface: PackageScanClassResolver

Gets the ClassLoader instances that should be used when scanning for classes.

This implementation will return a new unmodifiable set containing the classloaders. Use the PackageScanClassResolver.addClassLoader(ClassLoader) method if you want to add new classloaders to the class loaders list.

Specified by:

getClassLoaders in interface PackageScanClassResolver

Returns:

the class loaders to use

setClassLoaders

public void setClassLoaders(Set<ClassLoader> classLoaders)

Description copied from interface: PackageScanClassResolver

Sets the ClassLoader instances that should be used when scanning for classes. If none is set then the context classloader will be used.

Specified by:

setClassLoaders in interface PackageScanClassResolver

Parameters:

classLoaders - loaders to use when scanning for classes

findAnnotated

public Set<Class<?>> findAnnotated(Class<? extends Annotation> annotation,
                                   String... packageNames)

Description copied from interface: PackageScanClassResolver

Attempts to discover classes that are annotated with to the annotation.

Specified by:

findAnnotated in interface PackageScanClassResolver

Parameters:

annotation - the annotation that should be present on matching classes

packageNames - one or more package names to scan (including subpackages) for classes

Returns:

the classes found, returns an empty set if none found

findAnnotated

public Set<Class<?>> findAnnotated(Set<Class<? extends Annotation>> annotations,
                                   String... packageNames)

Description copied from interface: PackageScanClassResolver

Attempts to discover classes that are annotated with to the annotation.

Specified by:

findAnnotated in interface PackageScanClassResolver

Parameters:

annotations - the annotations that should be present (any of them) on matching classes

packageNames - one or more package names to scan (including subpackages) for classes

Returns:

the classes found, returns an empty set if none found

findImplementations

public Set<Class<?>> findImplementations(Class<?> parent,
                                         String... packageNames)

Description copied from interface: PackageScanClassResolver

Attempts to discover classes that are assignable to the type provided. In the case that an interface is provided this method will collect implementations. In the case of a non-interface class, subclasses will be collected.

Specified by:

findImplementations in interface PackageScanClassResolver

Parameters:

parent - the class of interface to find subclasses or implementations of

packageNames - one or more package names to scan (including subpackages) for classes

Returns:

the classes found, returns an empty set if none found

findByFilter

public Set<Class<?>> findByFilter(PackageScanFilter filter,
                                  String... packageNames)

Description copied from interface: PackageScanClassResolver

Attempts to discover classes filter by the provided filter

Specified by:

findByFilter in interface PackageScanClassResolver

Parameters:

filter - filter to filter desired classes.

packageNames - one or more package names to scan (including subpackages) for classes

Returns:

the classes found, returns an empty set if none found

find

protected void find(PackageScanFilter test,
                    String packageName,
                    Set<Class<?>> classes)

find

protected void find(PackageScanFilter test,
                    String packageName,
                    ClassLoader loader,
                    Set<Class<?>> classes)

customResourceLocator

protected URL customResourceLocator(URL url)
                             throws IOException

Throws:

IOException

getResources

protected Enumeration<URL> getResources(ClassLoader loader,
                                        String packageName)
                                 throws IOException

Strategy to get the resources by the given classloader.

Notice that in WebSphere platforms there is a WebSpherePackageScanClassResolver to take care of WebSphere's oddity of resource loading.

Parameters:

loader - the classloader

packageName - the packagename for the package to load

Returns:

URL's for the given package

Throws:

IOException - is thrown by the classloader

addIfMatching

protected void addIfMatching(PackageScanFilter test,
                             String fqn,
                             Set<Class<?>> classes)

Add the class designated by the fully qualified class name provided to the set of resolved classes if and only if it is approved by the Test supplied.

Parameters:

test - the test used to determine if the class matches

fqn - the fully qualified name of a class

doStart

protected void doStart()
                throws Exception

Description copied from class: ServiceSupport

Implementations override this method to support customized start/stop.

Important: See ServiceSupport.doStop() for more details.

Specified by:

doStart in class ServiceSupport

Throws:

Exception

See Also:

ServiceSupport.doStop()

doStop

protected void doStop()
               throws Exception

Description copied from class: ServiceSupport

Implementations override this method to support customized start/stop.

Important: Camel will invoke this ServiceSupport.doStop() method when the service is being stopped. This method will also be invoked if the service is still in uninitialized state (eg has not been started). The method is always called to allow the service to do custom logic when the service is being stopped, such as when CamelContext is shutting down.

Specified by:

doStop in class ServiceSupport

Throws:

Exception

See Also:

ServiceSupport.doStart()