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## org.apache.cayenne.reflect
Class PersistentDescriptor

    java.lang.Object
      org.apache.cayenne.reflect.PersistentDescriptor

All Implemented Interfaces:
  ClassDescriptor

    public class PersistentDescriptor

extends Object
implements ClassDescriptor

A default ClassDescriptor implementation for persistent objects.

Since:
  3.0

Field Summary
`protected Collection<ObjAttribute>` | `allDiscriminatorColumns`
`protected Map<String,Property>` | `declaredProperties`
`protected ObjEntity` | `entity`
`protected EntityInheritanceTree` | `entityInheritanceTree`
`protected Expression` | `entityQualifier`
`protected Collection<AttributeProperty>` | `idProperties`
`protected Collection<ArcProperty>` | `mapArcProperties`
`protected Class<?>` | `objectClass`
`protected Accessor` | `persistenceStateAccessor`
`protected Map<String,Property>` | `properties`
`protected Collection<DbEntity>` | `rootDbEntities`
`protected Map<String,ClassDescriptor>` | `subclassDescriptors`
`protected ClassDescriptor` | `superclassDescriptor`

Constructor Summary
`PersistentDescriptor()` Creates a PersistentDescriptor.

Method Summary
`void` | `addDeclaredProperty(Property property)` Registers a property.
`void` | `addRootDbEntity(DbEntity dbEntity)` Adds a root DbEntity to the list of roots, filtering duplicates.
`void` | `addSubclassDescriptor(String className, ClassDescriptor subclassDescriptor)` Adds a subclass descriptor that maps to a given class name.
`void` | `addSuperProperty(Property property)` Registers a superclass property.
`Object` | `createObject()` Creates a new instance of a class described by this object.
`Property` | `getDeclaredProperty(String propertyName)` Returns a Java Bean property descriptor matching property name or null if no such property is found.
`Collection<ObjAttribute>` | `getDiscriminatorColumns()` Returns a collection of ObjAttribute for the described class, its superclasses and subclasses, that participate in inheritance qualifier.
`ObjEntity` | `getEntity()` Returns an ObjEntity associated with this descriptor.
`EntityInheritanceTree` | `getEntityInheritanceTree()`
`Expression` | `getEntityQualifier()` Returns entity qualifier as a Cayenne expression that includes qualifiers for this entity and all subentities.
`Collection<AttributeProperty>` | `getIdProperties()` Returns a collection of the properties mapped to id columns.
`Collection<ArcProperty>` | `getMapArcProperties()` Returns a collection over the arc properties whose reverse arcs are to-many maps.
`Class<?>` | `getObjectClass()` Returns a class mapped by this descriptor.
`Property` | `getProperty(String propertyName)` Recursively looks up property descriptor in this class descriptor and all superclass descriptors.
`Collection<DbEntity>` | `getRootDbEntities()` Returns a collection of DbEntities that are the root tables for this descriptor's ObjEntity.
`ClassDescriptor` | `getSubclassDescriptor(Class<?> objectClass)` Returns the most "specialized" descriptor for a given class.
`ClassDescriptor` | `getSuperclassDescriptor()` Returns a descriptor of the mapped superclass or null if the descriptor's entity sits at the top of inheritance hierarchy.
`boolean` | `hasSubclasses()` Returns whether this class has persistent subclasses.
`void` | `injectValueHolders(Object object)` Invokes 'prepareForAccess' of a super descriptor and then invokes 'prepareForAccess' of each declared property.
`boolean` | `isFault(Object object)` Returns true if an object is not fully resolved.
`void` | `removeDeclaredProperty(String propertyName)` Removes declared property.
`void` | `setDiscriminatorColumns(Collection<ObjAttribute> columns)`
`void` | `setEntity(ObjEntity entity)`
`void` | `setEntityInheritanceTree(EntityInheritanceTree entityInheritanceTree)`
`void` | `setEntityQualifier(Expression entityQualifier)`
`void` | `setPersistenceStateAccessor(Accessor persistenceStateAccessor)`
`void` | `setSuperclassDescriptor(ClassDescriptor superclassDescriptor)`
`void` | `shallowMerge(Object from, Object to)` Copies object properties from one object to another.
`boolean` | `visitAllProperties(PropertyVisitor visitor)` Passes the visitor to the properties "visit" method for a combination of all properties, including properties declared in this descriptor, its super descriptors, and all subdescriptors.
`boolean` | `visitDeclaredProperties(PropertyVisitor visitor)` Passes the visitor to the properties "visit" method for all properties declared in this descriptor.
`boolean` | `visitProperties(PropertyVisitor visitor)` Passes the visitor to the properties "visit" method for all properties declared in this descriptor and all its super-decsriptors.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### superclassDescriptor

    protected ClassDescriptor superclassDescriptor

### objectClass

    protected Class<?> objectClass

### declaredProperties

    protected Map<String,Property> declaredProperties

### properties

    protected Map<String,Property> properties

### subclassDescriptors

    protected Map<String,ClassDescriptor> subclassDescriptors

### persistenceStateAccessor

    protected Accessor persistenceStateAccessor

### entity

    protected ObjEntity entity

### rootDbEntities

    protected Collection<DbEntity> rootDbEntities

### entityInheritanceTree

    protected EntityInheritanceTree entityInheritanceTree

### idProperties

    protected Collection<AttributeProperty> idProperties

### mapArcProperties

    protected Collection<ArcProperty> mapArcProperties

### allDiscriminatorColumns

    protected Collection<ObjAttribute> allDiscriminatorColumns

### entityQualifier

    protected Expression entityQualifier

Constructor Detail

### PersistentDescriptor

    public PersistentDescriptor()

  Creates a PersistentDescriptor.

Method Detail

### setDiscriminatorColumns

    public void setDiscriminatorColumns(Collection<ObjAttribute> columns)

### addSuperProperty

    public void addSuperProperty(Property property)

  Registers a superclass property.

### addDeclaredProperty

    public void addDeclaredProperty(Property property)

  Registers a property. This method is useful to customize default ClassDescriptor generated from ObjEntity by adding new properties or overriding the standard ones.

### addRootDbEntity

    public void addRootDbEntity(DbEntity dbEntity)

  Adds a root DbEntity to the list of roots, filtering duplicates.

### removeDeclaredProperty

    public void removeDeclaredProperty(String propertyName)

  Removes declared property. This method can be used to customize default ClassDescriptor generated from ObjEntity.

### addSubclassDescriptor

    public void addSubclassDescriptor(String className,
                                      ClassDescriptor subclassDescriptor)

  Adds a subclass descriptor that maps to a given class name.

### getEntity

    public ObjEntity getEntity()

  Description copied from interface: `ClassDescriptor`
  Returns an ObjEntity associated with this descriptor.

  Specified by:
    `getEntity` in interface `ClassDescriptor`

### getRootDbEntities

    public Collection<DbEntity> getRootDbEntities()

  Description copied from interface: `ClassDescriptor`
  Returns a collection of DbEntities that are the root tables for this descriptor's ObjEntity. Usually such collection would contain only one entity, however in cases involving subclass horizontal inheritance, it will be more than one, and in cases of abstract entities with no subclasses, the collection will be empty.

  Specified by:
    `getRootDbEntities` in interface `ClassDescriptor`

### isFault

    public boolean isFault(Object object)

  Description copied from interface: `ClassDescriptor`
  Returns true if an object is not fully resolved.

  Specified by:
    `isFault` in interface `ClassDescriptor`

### getObjectClass

    public Class<?> getObjectClass()

  Description copied from interface: `ClassDescriptor`
  Returns a class mapped by this descriptor.

  Specified by:
    `getObjectClass` in interface `ClassDescriptor`

### getSubclassDescriptor

    public ClassDescriptor getSubclassDescriptor(Class<?> objectClass)

  Description copied from interface: `ClassDescriptor`
  Returns the most "specialized" descriptor for a given class. This method assumes that the following is true:

       this.getObjectClass().isAssignableFrom(objectClass)

  Specified by:
    `getSubclassDescriptor` in interface `ClassDescriptor`

### getDiscriminatorColumns

    public Collection<ObjAttribute> getDiscriminatorColumns()

  Description copied from interface: `ClassDescriptor`
  Returns a collection of ObjAttribute for the described class, its superclasses and subclasses, that participate in inheritance qualifier. If a discriminator expression specifies a DbAttribute instead of an ObjAttribute, a synthetic ObjAttribute is created and returned.

  Specified by:
    `getDiscriminatorColumns` in interface `ClassDescriptor`

### getIdProperties

    public Collection<AttributeProperty> getIdProperties()

  Description copied from interface: `ClassDescriptor`
  Returns a collection of the properties mapped to id columns.

  Specified by:
    `getIdProperties` in interface `ClassDescriptor`

### getMapArcProperties

    public Collection<ArcProperty> getMapArcProperties()

  Description copied from interface: `ClassDescriptor`
  Returns a collection over the arc properties whose reverse arcs are to-many maps. I.e. for each ArcProperty in returned collection, the following is true:

       arc.getComplimentaryReverseArc() instanceof ToManyMapProperty

  Specified by:
    `getMapArcProperties` in interface `ClassDescriptor`

### getProperty

    public Property getProperty(String propertyName)

  Recursively looks up property descriptor in this class descriptor and all superclass descriptors.

  Specified by:
    `getProperty` in interface `ClassDescriptor`

### getDeclaredProperty

    public Property getDeclaredProperty(String propertyName)

  Description copied from interface: `ClassDescriptor`
  Returns a Java Bean property descriptor matching property name or null if no such property is found. Lookup DOES NOT including properties from the superclass descriptors. Returned property can be any one of `AttributeProperty`, `ToManyProperty`, `ToOneProperty`.

  Specified by:
    `getDeclaredProperty` in interface `ClassDescriptor`

### getSuperclassDescriptor

    public ClassDescriptor getSuperclassDescriptor()

  Returns a descriptor of the mapped superclass or null if the descriptor's entity sits at the top of inheritance hierarchy.

  Specified by:
    `getSuperclassDescriptor` in interface `ClassDescriptor`

### createObject

    public Object createObject()

  Creates a new instance of a class described by this object.

  Specified by:
    `createObject` in interface `ClassDescriptor`

### injectValueHolders

    public void injectValueHolders(Object object)
                            throws PropertyException

  Invokes 'prepareForAccess' of a super descriptor and then invokes 'prepareForAccess' of each declared property.

  Specified by:
    `injectValueHolders` in interface `ClassDescriptor`
  Throws:
    `PropertyException`

### shallowMerge

    public void shallowMerge(Object from,
                             Object to)
                      throws PropertyException

  Copies object properties from one object to another. Invokes 'shallowCopy' of a super descriptor and then invokes 'shallowCopy' of each declared property.

  Specified by:
    `shallowMerge` in interface `ClassDescriptor`
  Throws:
    `PropertyException`

### visitDeclaredProperties

    public boolean visitDeclaredProperties(PropertyVisitor visitor)

  Description copied from interface: `ClassDescriptor`
  Passes the visitor to the properties "visit" method for all properties declared in this descriptor. This property set excludes inherited properties, even those that got overridden in this subclass. Walkthrough is terminated in case one of the properties returns false. Returns true if all visited properties returned true, false - if one property returned false.

  Specified by:
    `visitDeclaredProperties` in interface `ClassDescriptor`
  Since:
    3.0

### visitAllProperties

    public boolean visitAllProperties(PropertyVisitor visitor)

  Description copied from interface: `ClassDescriptor`
  Passes the visitor to the properties "visit" method for a combination of all properties, including properties declared in this descriptor, its super descriptors, and all subdescriptors. Walkthrough is terminated in case one of the properties returns false. Returns true if all visited properties returned true, false - if one property returned false.

  Specified by:
    `visitAllProperties` in interface `ClassDescriptor`
  Since:
    3.0

### visitProperties

    public boolean visitProperties(PropertyVisitor visitor)

  Description copied from interface: `ClassDescriptor`
  Passes the visitor to the properties "visit" method for all properties declared in this descriptor and all its super-decsriptors. Properties that are overridden in subdescriptors will include overridden information. Walkthrough is terminated in case one of the properties returns false. Returns true if all visited properties returned true, false - if one property returned false.

  Specified by:
    `visitProperties` in interface `ClassDescriptor`

### setPersistenceStateAccessor

    public void setPersistenceStateAccessor(Accessor persistenceStateAccessor)

### setEntity

    public void setEntity(ObjEntity entity)

### setSuperclassDescriptor

    public void setSuperclassDescriptor(ClassDescriptor superclassDescriptor)

### getEntityQualifier

    public Expression getEntityQualifier()

  Description copied from interface: `ClassDescriptor`
  Returns entity qualifier as a Cayenne expression that includes qualifiers for this entity and all subentities.

  Specified by:
    `getEntityQualifier` in interface `ClassDescriptor`

### setEntityQualifier

    public void setEntityQualifier(Expression entityQualifier)

### getEntityInheritanceTree

    public EntityInheritanceTree getEntityInheritanceTree()

  Specified by:
    `getEntityInheritanceTree` in interface `ClassDescriptor`

### setEntityInheritanceTree

    public void setEntityInheritanceTree(EntityInheritanceTree entityInheritanceTree)

### hasSubclasses

    public boolean hasSubclasses()

  Description copied from interface: `ClassDescriptor`
  Returns whether this class has persistent subclasses.

  Specified by:
    `hasSubclasses` in interface `ClassDescriptor`

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