org.lenskit.data.entities

Class AbstractBeanEntity

java.lang.Object

org.lenskit.data.entities.AbstractEntity

org.lenskit.data.entities.AbstractBeanEntity

All Implemented Interfaces:

Entity, Describable

Direct Known Subclasses:

Rating

public abstract class AbstractBeanEntity
extends AbstractEntity

Abstract entity implementation that uses bean methods.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AbstractBeanEntity.BeanAttributeGetter Internal utility class - do not use.
protected static class	AbstractBeanEntity.BeanEntityLayout

Field Summary

Fields inherited from class org.lenskit.data.entities.AbstractEntity

id, type

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractBeanEntity(AbstractBeanEntity.BeanEntityLayout bel, EntityType typ, long id) Construct a bean entity.

Method Summary

Modifier and Type	Method and Description
java.util.Set<java.lang.String>	getAttributeNames() Get the names of the attributes in this entity.
java.util.Collection<Attribute<?>>	getAttributes() Get the attribute-value pairs.
boolean	getBoolean(TypedName<java.lang.Boolean> name) Get the value of a attr that contains a boolean.
double	getDouble(TypedName<java.lang.Double> name) Get the value of a attr that contains a double.
int	getInteger(TypedName<java.lang.Integer> name) Get the value of a attr that contains a int.
long	getLong(TypedName<java.lang.Long> name) Get the value of a attribute that contains a long.
java.util.Set<TypedName<?>>	getTypedAttributeNames() Get the attributes in this entity.
boolean	hasAttribute(java.lang.String name) Check if the entity has a field with a particular name.
boolean	hasAttribute(TypedName<?> name) Check if the entity has a attribute.
protected static AbstractBeanEntity.BeanEntityLayout	makeLayout(java.lang.Class<? extends AbstractBeanEntity> type)
java.lang.Object	maybeGet(java.lang.String attr) Get the value of a possibly-missing attribute by name.
<T> T	maybeGet(TypedName<T> name) Get the value of a possibly-missing attribute.

Methods inherited from class org.lenskit.data.entities.AbstractEntity

asMap, describeTo, equals, get, get, getId, getType, hashCode, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractBeanEntity

protected AbstractBeanEntity(AbstractBeanEntity.BeanEntityLayout bel,
                             EntityType typ,
                             long id)

Construct a bean entity.

Parameters:

bel - The layout (from makeLayout(Class)).

typ - The entity type

id - The entity ID.

Method Detail

getTypedAttributeNames

public java.util.Set<TypedName<?>> getTypedAttributeNames()

Description copied from interface: Entity

Get the attributes in this entity.

getAttributeNames

public java.util.Set<java.lang.String> getAttributeNames()

Description copied from class: AbstractEntity

Get the names of the attributes in this entity.

Delegates to Entity.getTypedAttributeNames() and extracts the names.

Specified by:

getAttributeNames in interface Entity

Overrides:

getAttributeNames in class AbstractEntity

getAttributes

public java.util.Collection<Attribute<?>> getAttributes()

Description copied from class: AbstractEntity

Get the attribute-value pairs.

Delegates to Entity.getTypedAttributeNames() and extracts the names.

Specified by:

getAttributes in interface Entity

Overrides:

getAttributes in class AbstractEntity

hasAttribute

public boolean hasAttribute(java.lang.String name)

Description copied from interface: Entity

Check if the entity has a field with a particular name.

Parameters:

name - The field name to look for.

Returns:

true if the entity has a field named name.

hasAttribute

public boolean hasAttribute(TypedName<?> name)

Description copied from class: AbstractEntity

Check if the entity has a attribute.

This implementation delegates to Entity.hasAttribute(String)

Specified by:

hasAttribute in interface Entity

Overrides:

hasAttribute in class AbstractEntity

Parameters:

name - The attribute name to look for.

Returns:

true if the entity contains attribute and the value is of the associated type.

maybeGet

@Nullable
public java.lang.Object maybeGet(java.lang.String attr)

Description copied from interface: Entity

Get the value of a possibly-missing attribute by name.

Parameters:

attr - The attribute name.

Returns:

The attribute’s value, or null if it is not present.

maybeGet

@Nullable
public <T> T maybeGet(TypedName<T> name)

Description copied from class: AbstractEntity

Get the value of a possibly-missing attribute.

This implementation delegates to Entity.maybeGet(String) and checks the type.

Specified by:

maybeGet in interface Entity

Overrides:

maybeGet in class AbstractEntity

Parameters:

name - The attribute name.

Returns:

The attribute’s value, or null if it is not present.

getLong

public long getLong(TypedName<java.lang.Long> name)

Description copied from class: AbstractEntity

Get the value of a attribute that contains a long.

This implementation delegates to AbstractEntity.get(TypedName).

Specified by:

getLong in interface Entity

Overrides:

getLong in class AbstractEntity

Parameters:

name - The attribute name.

Returns:

The attribute’s value.

getDouble

public double getDouble(TypedName<java.lang.Double> name)

Description copied from class: AbstractEntity

Get the value of a attr that contains a double.

This implementation delegates to AbstractEntity.get(TypedName).

Specified by:

getDouble in interface Entity

Overrides:

getDouble in class AbstractEntity

Parameters:

name - The attribute name.

Returns:

The attribute’s value.

getInteger

public int getInteger(TypedName<java.lang.Integer> name)

Description copied from class: AbstractEntity

Get the value of a attr that contains a int.

This implementation delegates to AbstractEntity.get(TypedName).

Specified by:

getInteger in interface Entity

Overrides:

getInteger in class AbstractEntity

Parameters:

name - The attribute name.

Returns:

The attribute’s value.

getBoolean

public boolean getBoolean(TypedName<java.lang.Boolean> name)

Description copied from class: AbstractEntity

Get the value of a attr that contains a boolean.

This implementation delegates to AbstractEntity.get(TypedName).

Specified by:

getBoolean in interface Entity

Overrides:

getBoolean in class AbstractEntity

Parameters:

name - The attribute name.

Returns:

The attribute’s value.

makeLayout

protected static AbstractBeanEntity.BeanEntityLayout makeLayout(java.lang.Class<? extends AbstractBeanEntity> type)