Package org.apache.cayenne.exp.property

Class EntityProperty<E extends Persistent>

java.lang.Object

org.apache.cayenne.exp.property.BaseProperty<E>

org.apache.cayenne.exp.property.EntityProperty<E>

All Implemented Interfaces:

PathProperty<E>, Property<E>, RelationshipProperty<E>

public class EntityProperty<E extends Persistent>
extends BaseProperty<E>
implements RelationshipProperty<E>

Property that represents to-one relationships.

Usage examples in where clause:

 ObjectSelect.query(Paintings.class)
      .where(Painting.TO_ARTIST.dot(Artist.ARTIST_NAME).eq("Pablo Picasso"));

Usage examples in column select, in this case full Artist entity will be returned in the result:

 ObjectSelect
      .columnQuery(Paintings.class, Painting.PAINTING_TITLE, Painting.TO_ARTIST);

Since:

4.2

See Also:

• org.apache.cayenne.exp.property

Field Summary

Fields inherited from class org.apache.cayenne.exp.property.BaseProperty

expressionSupplier, name, type

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EntityProperty(String name, Expression expression, Class<E> type)	Constructs a new property with the given name and expression

Method Summary

Modifier and Type	Method	Description
EntityProperty<E>	alias(String alias)	Creates alias with different name for this property
EntityProperty<E>	enclosing()
Expression	eqId(Object id)
Expression	inId(Object firstId, Object... moreIds)
Expression	inId(Collection<Object> ids)
Expression	neqId(Object id)
Expression	ninId(Object firstId, Object... moreIds)
Expression	ninId(Collection<Object> ids)
EntityProperty<E>	outer()	Returns a version of this property that represents an OUTER join.

Methods inherited from class org.apache.cayenne.exp.property.BaseProperty

asc, ascInsensitive, ascInsensitives, ascs, count, countDistinct, desc, descInsensitive, descInsensitives, descs, eq, eq, equals, function, function, getAlias, getExpression, getFrom, getFromAll, getName, getType, hashCode, in, in, in, isFalse, isNotNull, isNull, isTrue, ne, ne, nin, nin, nin, operator, operator, path, setIn, setInAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cayenne.exp.property.PathProperty

dot, dot, dot, dot, dot

Methods inherited from interface org.apache.cayenne.exp.property.Property

getAlias, getExpression, getName, getType

Methods inherited from interface org.apache.cayenne.exp.property.RelationshipProperty

disjoint, disjointById, dot, dot, dot, dot, dot, dot, dot, joint

Constructor Details

EntityProperty

protected EntityProperty(String name,
 Expression expression,
 Class<E> type)

Constructs a new property with the given name and expression

Parameters:

name - of the property (will be used as alias for the expression)

expression - expression for property

type - of the property

See Also:

• PropertyFactory.createBase(String, Expression, Class)

Method Details

eqId

public Expression eqId(Object id)

inId

public Expression inId(Collection<Object> ids)

inId

public Expression inId(Object firstId,
 Object... moreIds)

neqId

public Expression neqId(Object id)

ninId

public Expression ninId(Collection<Object> ids)

ninId

public Expression ninId(Object firstId,
 Object... moreIds)

alias

public EntityProperty<E> alias(String alias)

Creates alias with different name for this property

Overrides:

alias in class BaseProperty<E extends Persistent>

outer

public EntityProperty<E> outer()

Returns a version of this property that represents an OUTER join. It is up to caller to ensure that the property corresponds to a relationship, as "outer" attributes make no sense.

Specified by:

outer in interface RelationshipProperty<E extends Persistent>

enclosing

public EntityProperty<E> enclosing()

Overrides:

enclosing in class BaseProperty<E extends Persistent>

Returns:

property that will be translated relative to parent query