org.apache.cayenne.map

## Class DbEntity

- java.lang.Object
- - org.apache.cayenne.map.Entity
  - - org.apache.cayenne.map.DbEntity

- All Implemented Interfaces:
    Serializable, EventListener, ConfigurationNode, DbAttributeListener, DbEntityListener, DbRelationshipListener, CayenneMapEntry, XMLSerializable

      public class DbEntity
      extends Entity
      implements ConfigurationNode, DbEntityListener, DbAttributeListener, DbRelationshipListener

  A DbEntity is a mapping descriptor that defines a structure of a database table.
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `catalog`
    `protected Collection<DbAttribute>` | `generatedAttributes`
    `protected List<DbAttribute>` | `primaryKey`
    `protected DbKeyGenerator` | `primaryKeyGenerator`
    `protected Expression` | `qualifier` Qualifier, that will be applied to all select queries and joins with this DbEntity
    `protected String` | `schema`

    - ### Fields inherited from class org.apache.cayenne.map.Entity

      `attributes, dataMap, name, OUTER_JOIN_INDICATOR, PATH_SEPARATOR, relationships`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DbEntity()` Creates an unnamed DbEntity.
    `DbEntity(String name)` Creates a named DbEntity.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `<T> T` | `acceptVisitor(ConfigurationNodeVisitor<T> visitor)`
    `void` | `addAttribute(DbAttribute attr)` Adds a new attribute to this entity.
    `void` | `clearAttributes()`
    `void` | `dbAttributeAdded(AttributeEvent e)` New attribute has been created/added.
    `void` | `dbAttributeChanged(AttributeEvent e)` Attribute property changed.
    `void` | `dbAttributeRemoved(AttributeEvent e)` Attribute has been removed.
    `void` | `dbEntityAdded(EntityEvent e)` New entity has been created/added.
    `void` | `dbEntityChanged(EntityEvent e)` DbEntity property changed event.
    `void` | `dbEntityRemoved(EntityEvent e)` Entity has been removed.
    `void` | `dbRelationshipAdded(RelationshipEvent e)` Relationship has been created/added.
    `void` | `dbRelationshipChanged(RelationshipEvent e)` Relationship property changed.
    `void` | `dbRelationshipRemoved(RelationshipEvent e)` Relationship has been removed.
    `void` | `encodeAsXML(XMLEncoder encoder, ConfigurationNodeVisitor delegate)` Prints itself as XML to the provided XMLEncoder.
    `DbAttribute` | `getAttribute(String attributeName)` Returns attribute with name `attributeName` or null if no attribute with this name exists.
    `Collection<DbAttribute>` | `getAttributes()` Returns a Collection of all attributes that either belong to this DbEntity or inherited.
    `String` | `getCatalog()` Returns the catalog name of the table described by this DbEntity.
    `String` | `getFullyQualifiedName()` Returns table name including catalog and schema, if any of those are present.
    `Collection<DbAttribute>` | `getGeneratedAttributes()` Returns an unmodifiable collection of DbAttributes that are generated by the database.
    `DbKeyGenerator` | `getPrimaryKeyGenerator()` Return the primary key generator for this entity.
    `List<DbAttribute>` | `getPrimaryKeys()` Returns an unmodifiable collection of DbAttributes representing the primary key of the table described by this DbEntity.
    `Expression` | `getQualifier()`
    `DbRelationship` | `getRelationship(String relName)` Returns relationship with name `relName`.
    `Map<String,DbRelationship>` | `getRelationshipMap()` Returns an unmodifiable map of relationships sorted by name.
    `Collection<DbRelationship>` | `getRelationships()` Returns a Collection of relationships from this entity or inherited.
    `String` | `getSchema()` Returns database schema of this table.
    `boolean` | `isFullReplacementIdAttached(ObjectId id)` Returns true if there is full replacement id is attached to an ObjectId.
    `PathComponent<DbAttribute,DbRelationship>` | `lastPathComponent(Expression path, Map aliasMap)` Convenience method returning the last component in the path iterator.
    `Collection<ObjEntity>` | `mappedObjEntities()`
    `void` | `removeAttribute(String attrName)` Removes attribute from the entity, removes any relationship joins containing this attribute.
    `Iterable<PathComponent<DbAttribute,DbRelationship>>` | `resolvePath(Expression pathExp, Map aliasMap)` Returns an Iterable instance over expression path components based on this entity.
    `Iterator<CayenneMapEntry>` | `resolvePathComponents(Expression pathExp)` Processes expression `pathExp` and returns an Iterator of path components that contains a sequence of Attributes and Relationships.
    `void` | `setCatalog(String catalog)` Sets the catalog name of the table described by this DbEntity.
    `void` | `setPrimaryKeyGenerator(DbKeyGenerator primaryKeyGenerator)` Set the primary key generator for this entity.
    `void` | `setQualifier(Expression qualifier)` Sets qualifier for this entity
    `void` | `setSchema(String schema)` Sets the database schema name of the table described by this DbEntity.
    `Expression` | `translateToRelatedEntity(Expression expression, String relationshipPath)` Transforms Expression rooted in this entity to an analogous expression rooted in related entity.

    - ### Methods inherited from class org.apache.cayenne.map.Entity

      `addAttribute, addRelationship, clearRelationships, getAnyRelationship, getAttributeMap, getDataMap, getName, getParent, removeRelationship, resolvePathComponents, setDataMap, setName, setParent, toString, updateAttribute`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### catalog

          protected String catalog

    - #### schema

          protected String schema

    - #### primaryKey

          protected List<DbAttribute> primaryKey

    - #### generatedAttributes

          protected Collection<DbAttribute> generatedAttributes

      Since:
        1.2

    - #### primaryKeyGenerator

          protected DbKeyGenerator primaryKeyGenerator

    - #### qualifier

          protected Expression qualifier

      Qualifier, that will be applied to all select queries and joins with this DbEntity

  - ### Constructor Detail

    - #### DbEntity

          public DbEntity()

      Creates an unnamed DbEntity.

    - #### DbEntity

          public DbEntity(String name)

      Creates a named DbEntity.

  - ### Method Detail

    - #### getRelationship

          public DbRelationship getRelationship(String relName)

      Description copied from class: `Entity`
      Returns relationship with name `relName`. Will return null if no relationship with this name exists in the entity.
      Overrides:
        `getRelationship` in class `Entity`

    - #### getAttribute

          public DbAttribute getAttribute(String attributeName)

      Description copied from class: `Entity`
      Returns attribute with name `attributeName` or null if no attribute with this name exists.
      Overrides:
        `getAttribute` in class `Entity`

    - #### acceptVisitor

          public <T> T acceptVisitor(ConfigurationNodeVisitor<T> visitor)

      Specified by:
        `acceptVisitor` in interface `ConfigurationNode`
      Since:
        3.1

    - #### encodeAsXML

          public void encodeAsXML(XMLEncoder encoder,
                                  ConfigurationNodeVisitor delegate)

      Prints itself as XML to the provided XMLEncoder.
      Specified by:
        `encodeAsXML` in interface `XMLSerializable`
      Since:
        1.1

    - #### getFullyQualifiedName

          public String getFullyQualifiedName()

      Returns table name including catalog and schema, if any of those are present.

    - #### getSchema

          public String getSchema()

      Returns database schema of this table.
      Returns:
        table's schema, null if not set.

    - #### setSchema

          public void setSchema(String schema)

      Sets the database schema name of the table described by this DbEntity.

    - #### getCatalog

          public String getCatalog()

      Returns the catalog name of the table described by this DbEntity.

    - #### setCatalog

          public void setCatalog(String catalog)

      Sets the catalog name of the table described by this DbEntity.

    - #### getPrimaryKeys

          public List<DbAttribute> getPrimaryKeys()

      Returns an unmodifiable collection of DbAttributes representing the primary key of the table described by this DbEntity.
      Since:
        3.0

    - #### getAttributes

          public Collection<DbAttribute> getAttributes()

      Returns a Collection of all attributes that either belong to this DbEntity or inherited.
      Overrides:
        `getAttributes` in class `Entity`

    - #### getGeneratedAttributes

          public Collection<DbAttribute> getGeneratedAttributes()

      Returns an unmodifiable collection of DbAttributes that are generated by the database.
      Since:
        1.2

    - #### addAttribute

          public void addAttribute(DbAttribute attr)

      Adds a new attribute to this entity.
      Throws:
        `IllegalArgumentException` - if Attribute has no name or there is an existing attribute with the same name
        `IllegalArgumentException` - if a relationship has the same name as this attribute
      Since:
        3.0

    - #### removeAttribute

          public void removeAttribute(String attrName)

      Removes attribute from the entity, removes any relationship joins containing this attribute. Does nothing if the attribute name is not found.
      Overrides:
        `removeAttribute` in class `Entity`
      See Also:
        `Entity.removeAttribute(String)`

    - #### clearAttributes

          public void clearAttributes()

      Overrides:
        `clearAttributes` in class `Entity`

    - #### getRelationships

          public Collection<DbRelationship> getRelationships()

      Returns a Collection of relationships from this entity or inherited.
      Overrides:
        `getRelationships` in class `Entity`

    - #### getRelationshipMap

          public Map<String,DbRelationship> getRelationshipMap()

      Description copied from class: `Entity`
      Returns an unmodifiable map of relationships sorted by name.
      Overrides:
        `getRelationshipMap` in class `Entity`

    - #### lastPathComponent

          public PathComponent<DbAttribute,DbRelationship> lastPathComponent(Expression path,
                                                                             Map aliasMap)

      Description copied from class: `Entity`
      Convenience method returning the last component in the path iterator. If the last component is an alias, it is fully resolved down to the last ObjRelationship.
      Overrides:
        `lastPathComponent` in class `Entity`
      Since:
        3.0

    - #### resolvePath

          public Iterable<PathComponent<DbAttribute,DbRelationship>> resolvePath(Expression pathExp,
                                                                                 Map aliasMap)

      Returns an Iterable instance over expression path components based on this entity.
      Specified by:
        `resolvePath` in class `Entity`
      Since:
        3.0

    - #### resolvePathComponents

          public Iterator<CayenneMapEntry> resolvePathComponents(Expression pathExp)
                                                          throws ExpressionException

      Description copied from class: `Entity`
      Processes expression `pathExp` and returns an Iterator of path components that contains a sequence of Attributes and Relationships. Note that if path is invalid and can not be resolved from this entity, this method will still return an Iterator, but an attempt to read the first invalid path component will result in ExpressionException.
      Specified by:
        `resolvePathComponents` in class `Entity`
      Throws:
        `ExpressionException`

    - #### setPrimaryKeyGenerator

          public void setPrimaryKeyGenerator(DbKeyGenerator primaryKeyGenerator)

      Set the primary key generator for this entity. If null is passed, nothing is changed.

    - #### getPrimaryKeyGenerator

          public DbKeyGenerator getPrimaryKeyGenerator()

      Return the primary key generator for this entity.

    - #### dbEntityChanged

          public void dbEntityChanged(EntityEvent e)

      DbEntity property changed event. May be name, attribute or relationship added or removed, etc. Attribute and relationship property changes are handled in respective listeners.
      Specified by:
        `dbEntityChanged` in interface `DbEntityListener`
      Since:
        1.2

    - #### dbEntityAdded

          public void dbEntityAdded(EntityEvent e)

      New entity has been created/added.
      Specified by:
        `dbEntityAdded` in interface `DbEntityListener`

    - #### dbEntityRemoved

          public void dbEntityRemoved(EntityEvent e)

      Entity has been removed.
      Specified by:
        `dbEntityRemoved` in interface `DbEntityListener`

    - #### dbAttributeAdded

          public void dbAttributeAdded(AttributeEvent e)

      Description copied from interface: `DbAttributeListener`
      New attribute has been created/added.
      Specified by:
        `dbAttributeAdded` in interface `DbAttributeListener`

    - #### dbAttributeChanged

          public void dbAttributeChanged(AttributeEvent e)

      Description copied from interface: `DbAttributeListener`
      Attribute property changed.
      Specified by:
        `dbAttributeChanged` in interface `DbAttributeListener`

    - #### dbAttributeRemoved

          public void dbAttributeRemoved(AttributeEvent e)

      Description copied from interface: `DbAttributeListener`
      Attribute has been removed.
      Specified by:
        `dbAttributeRemoved` in interface `DbAttributeListener`

    - #### dbRelationshipChanged

          public void dbRelationshipChanged(RelationshipEvent e)

      Relationship property changed.
      Specified by:
        `dbRelationshipChanged` in interface `DbRelationshipListener`

    - #### dbRelationshipAdded

          public void dbRelationshipAdded(RelationshipEvent e)

      Relationship has been created/added.
      Specified by:
        `dbRelationshipAdded` in interface `DbRelationshipListener`

    - #### dbRelationshipRemoved

          public void dbRelationshipRemoved(RelationshipEvent e)

      Relationship has been removed.
      Specified by:
        `dbRelationshipRemoved` in interface `DbRelationshipListener`

    - #### getQualifier

          public Expression getQualifier()

      Returns:
        qualifier that will be ANDed to all select queries with this entity

    - #### setQualifier

          public void setQualifier(Expression qualifier)

      Sets qualifier for this entity

    - #### isFullReplacementIdAttached

          public boolean isFullReplacementIdAttached(ObjectId id)

      Returns true if there is full replacement id is attached to an ObjectId. "Full" means that all PK columns are present and only PK columns are present.
      Since:
        1.2

    - #### mappedObjEntities

          public Collection<ObjEntity> mappedObjEntities()

    - #### translateToRelatedEntity

          public Expression translateToRelatedEntity(Expression expression,
                                                     String relationshipPath)

      Transforms Expression rooted in this entity to an analogous expression rooted in related entity.
      Specified by:
        `translateToRelatedEntity` in class `Entity`
      Since:
        1.1

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