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## org.apache.cayenne.map
Class Entity

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

All Implemented Interfaces:
  Serializable, CayenneMapEntry, XMLSerializable

Direct Known Subclasses:
  DbEntity, ObjEntity

    public abstract class Entity

extends Object
implements CayenneMapEntry, XMLSerializable, Serializable

An Entity is an abstract descriptor for an entity mapping concept. Entity can represent either a descriptor of database table or a persistent object.

Author:
  Andrus Adamchik
See Also:
  Serialized Form

Field Summary
`protected SortedMap` | `attributes`
`protected DataMap` | `dataMap`
`protected String` | `name`
`static String` | `PATH_SEPARATOR`
`protected SortedMap` | `relationships`

Constructor Summary
`Entity()` Creates an unnamed Entity.
`Entity(String name)` Creates a named Entity.

Method Summary
`void` | `addAttribute(Attribute attribute)` Adds new attribute to the entity, setting its parent entity to be this object.
`void` | `addRelationship(Relationship relationship)` Adds new relationship to the entity.
`void` | `clearAttributes()`
`void` | `clearRelationships()`
`Relationship` | `getAnyRelationship(Entity targetEntity)` Returns a relationship that has a specified entity as a target.
`Attribute` | `getAttribute(String attributeName)` Returns attribute with name `attributeName` or null if no attribute with this name exists.
`SortedMap` | `getAttributeMap()` Returns an unmodifiable sorted map of entity attributes.
`Collection` | `getAttributes()` Returns an unmodifiable collection of entity attributes.
`DataMap` | `getDataMap()`
`String` | `getName()` Returns entity name.
`Object` | `getParent()` Returns the parent map.
`Relationship` | `getRelationship(String relName)` Returns relationship with name `relName`.
`SortedMap` | `getRelationshipMap()` Returns an unmodifiable map of relationships sorted by name.
`Collection` | `getRelationships()` Returns an unmodifiable collection of Relationships that exist in this entity.
`Object` | `lastPathComponent(Expression pathExp)` Convenience method returning the last component in the path iterator.
`void` | `removeAttribute(String attrName)` Removes an attribute named `attrName`.
`void` | `removeRelationship(String relName)` Removes a relationship named `attrName`.
`abstract Iterator` | `resolvePathComponents(Expression pathExp)` Processes expression `pathExp` and returns an Iterator of path components that contains a sequence of Attributes and Relationships.
`Iterator` | `resolvePathComponents(String path)` Returns an Iterator over the path components that contains a sequence of Attributes and Relationships.
`void` | `setDataMap(DataMap dataMap)` Sets parent DataMap of this entity.
`void` | `setName(String name)`
`void` | `setParent(Object parent)` Stores the parent map.
`String` | `toString()`
`abstract Expression` | `translateToRelatedEntity(Expression expression, String relationshipPath)` Translates Expression rooted in this entity to an analogous expression rooted in related entity.

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

Methods inherited from interface org.apache.cayenne.util.XMLSerializable
`encodeAsXML`

Field Detail

### PATH_SEPARATOR

    public static final String PATH_SEPARATOR

See Also:
  Constant Field Values

### name

    protected String name

### dataMap

    protected DataMap dataMap

### attributes

    protected SortedMap attributes

### relationships

    protected SortedMap relationships

Constructor Detail

### Entity

    public Entity()

  Creates an unnamed Entity.

### Entity

    public Entity(String name)

  Creates a named Entity.

Method Detail

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### getName

    public String getName()

  Returns entity name. Name is a unique identifier of the entity within its DataMap.

  Specified by:
    `getName` in interface `CayenneMapEntry`
  Returns:
    name of this entry.

### setName

    public void setName(String name)

### getParent

    public Object getParent()

  Description copied from interface: `CayenneMapEntry`
  Returns the parent map.

  Specified by:
    `getParent` in interface `CayenneMapEntry`

### setParent

    public void setParent(Object parent)

  Description copied from interface: `CayenneMapEntry`
  Stores the parent map.

  Specified by:
    `setParent` in interface `CayenneMapEntry`

### getDataMap

    public DataMap getDataMap()

  Returns:
    parent DataMap of this entity.

### setDataMap

    public void setDataMap(DataMap dataMap)

  Sets parent DataMap of this entity.

### getAttribute

    public Attribute getAttribute(String attributeName)

  Returns attribute with name `attributeName` or null if no attribute with this name exists.

### addAttribute

    public void addAttribute(Attribute attribute)

  Adds new attribute to the entity, setting its parent entity to be this object. If attribute has no name, IllegalArgumentException is thrown.

### removeAttribute

    public void removeAttribute(String attrName)

  Removes an attribute named `attrName`.

### clearAttributes

    public void clearAttributes()

### getRelationship

    public Relationship getRelationship(String relName)

  Returns relationship with name `relName`. Will return null if no relationship with this name exists in the entity.

### addRelationship

    public void addRelationship(Relationship relationship)

  Adds new relationship to the entity.

### removeRelationship

    public void removeRelationship(String relName)

  Removes a relationship named `attrName`.

### clearRelationships

    public void clearRelationships()

### getRelationshipMap

    public SortedMap getRelationshipMap()

  Returns an unmodifiable map of relationships sorted by name.

### getAnyRelationship

    public Relationship getAnyRelationship(Entity targetEntity)

  Returns a relationship that has a specified entity as a target. If there is more than one relationship for the same target, it is unpredictable which one will be returned.

  Since:
    1.1

### getRelationships

    public Collection getRelationships()

  Returns an unmodifiable collection of Relationships that exist in this entity.

### getAttributeMap

    public SortedMap getAttributeMap()

  Returns an unmodifiable sorted map of entity attributes.

### getAttributes

    public Collection getAttributes()

  Returns an unmodifiable collection of entity attributes.

### translateToRelatedEntity

    public abstract Expression translateToRelatedEntity(Expression expression,
                                                        String relationshipPath)

  Translates Expression rooted in this entity to an analogous expression rooted in related entity.

  Since:
    1.1

### lastPathComponent

    public Object lastPathComponent(Expression pathExp)

  Convenience method returning the last component in the path iterator.

  Since:
    1.1
  See Also:
    `resolvePathComponents(Expression)`

### resolvePathComponents

    public abstract Iterator resolvePathComponents(Expression pathExp)
                                            throws ExpressionException

  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.

  Throws:
    `ExpressionException`

### resolvePathComponents

    public Iterator resolvePathComponents(String path)
                                   throws ExpressionException

  Returns an Iterator over the 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.

  Throws:
    `ExpressionException`

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