com.bea.p13n.property
Class HierarchicalEntityImpl

java.lang.Object
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  +--com.bea.p13n.property.AbstractConfigurableEntity
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        +--com.bea.p13n.property.ConfigurableEntityImpl
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              +--com.bea.p13n.property.HierarchicalEntityImpl

public abstract class HierarchicalEntityImpl

extends ConfigurableEntityImpl

HierarchicalEntity extends ConfigurableEntity by describing an interface by which Entities can be included in a hierachy of successors. The resulting hierarchy is searched upward when getting Properties. This design pattern models the Chain of Responsibility Pattern (Gamma et al).

For example, if an entity A has a successor entity B, and A is queried for a property but does not have a value persisted for that property, it will lookup entity B and query it for that property.

Also, "explicit" successors can be specified as part of a getProperty method call. These are other ConfigurableEntities that should be queried after the current entity, but before any persisted successors.

A HierarchicalEntity can have one successor persisted for each property set, as well as a "default" successor that is not associated with a property set. The default successor will be queried in the case that the current entity does not have a value, the explicit successor (if one is specified) does not have a value, and the successor for the property's property set does not have a value.

See Also:

Serialized Form

Field Summary

protected static java.lang.String

FIND_BY_PK finder method name

Fields inherited from class com.bea.p13n.property.ConfigurableEntityImpl

_ctx, _environmentNamingContext, COMMERCE_POOL, ENTITY_PROPERTY_MANAGER, entityPropertyManager, JNDI_NAME, PROPERTY_SET_MANAGER, PROPERTY_SET_TYPE, propertyLocator, psManager, textFormatter, uid

Fields inherited from class com.bea.p13n.property.AbstractConfigurableEntity

CE_METHOD_CACHE, instanceClass, PREFIX_GET, PREFIX_SET, propertyCache, textFormatter

Constructor Summary

HierarchicalEntityImpl()

Method Summary

protected java.lang.reflect.Method	getFindByPrimaryKey(java.lang.Class homeClass, java.lang.Class[] params) Get the findByPrimaryKey method from a home interface.
protected java.lang.Object	getImplicitProperty(java.lang.String propertySet, java.lang.String propertyName) Override ConfigurableEntity.getImplicitProperty to do a successor search if the property was not found in this entity
protected java.lang.Object	getImplicitProperty(java.lang.String propertySet, java.lang.String propertyName, ConfigurableEntity explicitSuccessor) Search for the property value in the default database tables; first in the current entity, then in the explicit successor entity, then in the implicit successor for the property set, and finally in the default implicit successor for this entity.
java.lang.Object	getProperty(java.lang.String propertySet, java.lang.String propertyName, ConfigurableEntity successor) Retrieve the value associated with the named key in the specified property set.
java.lang.String	getPropertyAsString(java.lang.String propertySet, java.lang.String propertyName, ConfigurableEntity successor) Convenience method to return the property as a String.
java.lang.Object	getPropertyNoDefault(java.lang.String propertySet, java.lang.String propertyName, ConfigurableEntity successor) Retrieve the value associated with the property in the specified property set, but does not return a default value from the property's PropertyDefinition if the property does not exist for the entity or in the hierarchy of successors.
ConfigurableEntity	getSuccessor(java.lang.String propertySet) Retrieve the successor associated with this ConfigurableEntity for the specified property set.
protected ConfigurableEntity	getSuccessorFromId(java.lang.Long anEntityId) Get the entity represented by a unique entity id.
void	removeSuccessor(java.lang.String propertySet) Remove the successor for the specified propertySet.
void	setSuccessor(java.lang.String propertySet, ConfigurableEntity successor) This sets the successor for this object.

Methods inherited from class com.bea.p13n.property.ConfigurableEntityImpl

createUniqueId, ejbActivate, ejbCreate, ejbFindByPrimaryKey, ejbLoad, ejbPassivate, ejbPostCreate, ejbRemove, ejbStore, getConnection, getDefaultSqlBundleName, getEntityContext, getEntityPropertyManager, getEnvironmentNamingContext, getEnvironmentProperty, getEnvironmentProperty, getJndiName, getPkString, getProperty, getPropertyCache, getPropertyDefault, getPropertyLocator, getPropertyLocator, getPropertySetManager, getStatement, getUniqueId, removeProperty, setEntityContext, setProperty, unsetEntityContext, useEntityPropertyManager

Methods inherited from class com.bea.p13n.property.AbstractConfigurableEntity

createMapKey, getCachedProperty, getExplicitProperty, getExplicitSetter, getPropertyAsString, getPropertyNoDefault, hasExplicitGetter, hasExplicitSetter, removeExplicitProperty, setExplicitProperty, upcaseFirst

Methods inherited from class java.lang.Object

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

Field Detail

FIND_BY_PK

protected static final java.lang.String FIND_BY_PK

finder method name

Constructor Detail

HierarchicalEntityImpl

public HierarchicalEntityImpl()

Method Detail

getProperty

public java.lang.Object getProperty(java.lang.String propertySet,
                                    java.lang.String propertyName,
                                    ConfigurableEntity successor)
                             throws java.rmi.RemoteException

Retrieve the value associated with the named key in the specified property set. If the entity does not have a value defined for that property, the property will be searched in the successor hiearchy using the explicit successor first and then the successor for the specified scope, and finally the entity's default successor. If this search does not return a value, the default value from the property set will be returned.

Parameters:

propertySet - The name of the property set

propertyName - The name of the property to retrieve.

successor - The explicit successor to use for sucessor hiearchy search if the entity does not have the property defined.

getPropertyAsString

public java.lang.String getPropertyAsString(java.lang.String propertySet,
                                            java.lang.String propertyName,
                                            ConfigurableEntity successor)
                                     throws java.rmi.RemoteException

Convenience method to return the property as a String. Follows the same search order as the getProperty method.

Parameters:

propertySet - The name of the property set

propertyName - The name of the property to retrieve.

successor - The explicit successor to use for sucessor hiearchy search if the entity does not have the property defined.

getPropertyNoDefault

public java.lang.Object getPropertyNoDefault(java.lang.String propertySet,
                                             java.lang.String propertyName,
                                             ConfigurableEntity successor)
                                      throws java.rmi.RemoteException

Retrieve the value associated with the property in the specified property set, but does not return a default value from the property's PropertyDefinition if the property does not exist for the entity or in the hierarchy of successors. This method is used by the implementation of the getProperty methods so that the search in the successor hierarchy does not return a default value from the PropertySet.

Parameters:

propertySet - The name of the property set

propertyName - The name of the property to retrieve.

successor - The explicit successor to use for sucessor hiearchy search if the entity does not have the property defined.

getImplicitProperty

protected java.lang.Object getImplicitProperty(java.lang.String propertySet,
                                               java.lang.String propertyName)
                                        throws java.rmi.RemoteException

Override ConfigurableEntity.getImplicitProperty to do a successor search if the property was not found in this entity

Parameters:

propertySet - The name of the property set

propertyName - The name of the property to retrieve.

Overrides:

getImplicitProperty in class AbstractConfigurableEntity

getImplicitProperty

protected java.lang.Object getImplicitProperty(java.lang.String propertySet,
                                               java.lang.String propertyName,
                                               ConfigurableEntity explicitSuccessor)
                                        throws java.rmi.RemoteException

Search for the property value in the default database tables; first in the current entity, then in the explicit successor entity, then in the implicit successor for the property set, and finally in the default implicit successor for this entity.

Parameters:

propertySet - The name of the property set

propertyName - The name of the property to retrieve.

explicitSuccessor - The explicit successor to use for sucessor hiearchy search if the entity does not have the property defined.

removeSuccessor

public void removeSuccessor(java.lang.String propertySet)

Remove the successor for the specified propertySet.

setSuccessor

public void setSuccessor(java.lang.String propertySet,
                         ConfigurableEntity successor)

This sets the successor for this object. This is used when resolving the getProperty.

Parameters:

successor -

getSuccessor

public ConfigurableEntity getSuccessor(java.lang.String propertySet)
                                throws java.rmi.RemoteException

Retrieve the successor associated with this ConfigurableEntity for the specified property set.

Parameters:

propertySet - the property set to look in

Returns:

this entity's successor, or null if one was not defined

getSuccessorFromId

protected ConfigurableEntity getSuccessorFromId(java.lang.Long anEntityId)
                                         throws java.rmi.RemoteException

Get the entity represented by a unique entity id.

Parameters:

anEntityId - the successor's unique entity id

Returns:

a reference to the successor entity, or null if it could not be found

getFindByPrimaryKey

protected java.lang.reflect.Method getFindByPrimaryKey(java.lang.Class homeClass,
                                                       java.lang.Class[] params)

Get the findByPrimaryKey method from a home interface. This will cache the methods based on home class for faster lookups.