ch.elca.el4j.util.metadata
Class DefaultGenericMetaDataSource

java.lang.Object
  ch.elca.el4j.util.metadata.DefaultGenericMetaDataSource

All Implemented Interfaces:

GenericMetaDataSource

Direct Known Subclasses:

TransactionMetaDataSource

public class DefaultGenericMetaDataSource
extends Object
implements GenericMetaDataSource

The default implementation of the GenericAttributeSource interface.

Author:

Raphael Boog (RBO), Martin Zeltner (MZE)

File-location:

DefaultGenericMetaDataSource

Last check-in date:

2010-01-15 12:21:07 +0100 (Fr, 15. Jan 2010) by jonasha for revision 4091

Field Summary

protected Map<String,Collection>	m_cache Cache of Attributes, keyed by Method and target class.
protected static Collection	NULL_METADATA Canonical value held in cache to indicate that no metadata was found for a method.

Constructor Summary

DefaultGenericMetaDataSource()

Method Summary

protected Collection	computeMetaData(Method method, Class targetClass) Same as method getMetaData(Method, Class) but without caching of the result.
protected Collection	filterMetaData(Collection metaData)
protected Collection	findAllAttributes(Class clazz)
protected Collection	findAllAttributes(Method m)
protected String	getCacheKey(Method method, Class targetClass) Calculates the cache key of a certain method in a certain class.
List<Class>	getInterceptingMetaData()
Collection	getMetaData(Method method, Class targetClass)
Attributes	getMetaDataDelegator() Getter method to get the metadata implementation.
void	setInterceptingMetaData(List<Class> interceptedAttributes) Setter method for the list of metadata types where to apply the interceptor.
void	setMetaDataDelegator(Attributes metaDataDelegator) Setter method to set the metadata implementation.

Methods inherited from class java.lang.Object

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

Field Detail

NULL_METADATA

protected static final Collection NULL_METADATA

Canonical value held in cache to indicate that no metadata was found for a method. So we don't need to look for metadata again.

m_cache

protected final Map<String,Collection> m_cache

Cache of Attributes, keyed by Method and target class.

Constructor Detail

DefaultGenericMetaDataSource

public DefaultGenericMetaDataSource()

Method Detail

getCacheKey

protected String getCacheKey(Method method,
                             Class targetClass)

Calculates the cache key of a certain method in a certain class.

Parameters:

method - method for the current invocation.

targetClass - targetClass for this invocation. May be null.

Returns:

Returns the cache key string.

getMetaData

public Collection getMetaData(Method method,
                              Class targetClass)

Specified by:

getMetaData in interface GenericMetaDataSource

Parameters:

method - Is the method for the current invocation. Must not be null.

targetClass - target class for this invocation. May be null.

Returns:

Returns a collection of the matching meta data for the given method and targetClass.

computeMetaData

protected Collection computeMetaData(Method method,
                                     Class targetClass)

Same as method getMetaData(Method, Class) but without caching of the result.

Parameters:

method - Is the method for the current invocation. Must not be null.

targetClass - target class for this invocation. May be null.

Returns:

Returns a collection of the matching meta data for the given method and targetClass.

findAllAttributes

protected Collection findAllAttributes(Method m)

Parameters:

m - Is the method to retrieve metadata for.

Returns:

Returns all found metadata associated with the given method or null if no metadata could be found.

findAllAttributes

protected Collection findAllAttributes(Class clazz)

Parameters:

clazz - Is the class to retrieve metadata for.

Returns:

Returns all found metadata associated with the given class or null if no metadata could be found.

filterMetaData

protected Collection filterMetaData(Collection metaData)

Parameters:

metaData - Are the metadata to filter.

Returns:

Returns the filtered collection of metadata or null if the returned collection would be empty. Only intercepting metadata will endure the filter process.

getMetaDataDelegator

public Attributes getMetaDataDelegator()

Description copied from interface: GenericMetaDataSource

Getter method to get the metadata implementation.

Specified by:

getMetaDataDelegator in interface GenericMetaDataSource

Returns:

Returns the metaDataDelegator.

setMetaDataDelegator

public void setMetaDataDelegator(Attributes metaDataDelegator)

Description copied from interface: GenericMetaDataSource

Setter method to set the metadata implementation.

Specified by:

setMetaDataDelegator in interface GenericMetaDataSource

Parameters:

metaDataDelegator - Is the metaDataDelegator to set.

getInterceptingMetaData

public List<Class> getInterceptingMetaData()

Specified by:

getInterceptingMetaData in interface GenericMetaDataSource

Returns:

Returns the metadata type list.

setInterceptingMetaData

public void setInterceptingMetaData(List<Class> interceptedAttributes)

Setter method for the list of metadata types where to apply the interceptor.

Specified by:

setInterceptingMetaData in interface GenericMetaDataSource

Parameters:

interceptedAttributes - Is the metadata type list.