Package org.neo4j.ogm.metadata.reflect

Class EntityAccessManager

java.lang.Object

org.neo4j.ogm.metadata.reflect.EntityAccessManager

public class EntityAccessManager
extends Object

Determines how entities should be accessed in both reading and writing scenarios by looking up information from ClassInfo in the following order.

1. Annotated Field
2. Plain Field

The rationale is simply that we want annotations, whether on fields or on methods, to always take precedence, and we want to use methods in preference to field access, because in many cases hydrating an object means more than just assigning values to fields.

Author:

Adam George, Luanne Misquitta, Michael J. Simons

Constructor Summary

Constructors

Constructor	Description
EntityAccessManager()

Method Summary

Modifier and Type	Method	Description
static FieldInfo	getIterableField(ClassInfo classInfo, Class<?> parameterType, String relationshipType, Relationship.Direction relationshipDirection)	Returns an FieldWriter for an iterable of a non-primitive scalar type defined by a ClassInfo
static FieldInfo	getRelationalReader(ClassInfo classInfo, String relationshipType, Relationship.Direction relationshipDirection)	Returns a FieldInfo for a scalar type definition on a ClassInfo that is not a primitive graph property
static FieldInfo	getRelationalWriter(ClassInfo classInfo, String relationshipType, Relationship.Direction relationshipDirection, Class<?> objectType)	Returns a FieldWriter for a scalar type on a ClassInfo that is not a primitive graph property
static FieldInfo	getRelationalWriter(ClassInfo classInfo, String relationshipType, Relationship.Direction relationshipDirection, Object scalarValue)	Returns a FieldWriter for a scalar value represented as a relationship in the graph (i.e.
static Object	merge(Class<?> parameterType, Object newValues, Object[] currentValues, Class elementType)
static Object	merge(Class<?> collectionType, Object newValues, Collection currentValues, Class elementType)	Merges the contents of collection with hydrated ensuring no duplicates and returns the result as an instance of the given parameter type.

Methods inherited from class java.lang.Object

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

Constructor Details

EntityAccessManager

public EntityAccessManager()

Method Details

merge

public static Object merge(Class<?> parameterType,
 Object newValues,
 Object[] currentValues,
 Class elementType)

merge

public static Object merge(Class<?> collectionType,
 Object newValues,
 Collection currentValues,
 Class elementType)

Merges the contents of collection with hydrated ensuring no duplicates and returns the result as an instance of the given parameter type.

Parameters:

collectionType - The type of Iterable or array to return

newValues - The objects to merge into a collection of the given parameter type, which may not necessarily be of a type assignable from collectionType already

currentValues - The Iterable to merge into, which may be null if a new collection needs creating

elementType - The type of the element in the array or collection (After conversion has been applied)

Returns:

The result of the merge, as an instance of the specified parameter type

getRelationalWriter

public static FieldInfo getRelationalWriter(ClassInfo classInfo,
 String relationshipType,
 Relationship.Direction relationshipDirection,
 Object scalarValue)

Returns a FieldWriter for a scalar value represented as a relationship in the graph (i.e. not a primitive property)

Parameters:

classInfo - the ClassInfo (or a superclass thereof) declaring the relationship

relationshipType - the name of the relationship as it is in the graph

relationshipDirection - the direction of the relationship as it is in the graph

scalarValue - an Object whose class the relationship is defined for

Returns:

a valid FieldWriter or null if none is found

getRelationalWriter

public static FieldInfo getRelationalWriter(ClassInfo classInfo,
 String relationshipType,
 Relationship.Direction relationshipDirection,
 Class<?> objectType)

Returns a FieldWriter for a scalar type on a ClassInfo that is not a primitive graph property

Parameters:

classInfo - the ClassInfo (or a superclass thereof) declaring the relationship

relationshipType - the name of the relationship as it is in the graph

relationshipDirection - the direction of the relationship as it is in the graph

objectType - the class the relationship is defined for

Returns:

a valid FieldWriter or null if none is found

getRelationalReader

public static FieldInfo getRelationalReader(ClassInfo classInfo,
 String relationshipType,
 Relationship.Direction relationshipDirection)

Returns a FieldInfo for a scalar type definition on a ClassInfo that is not a primitive graph property

Parameters:

classInfo - A ClassInfo declaring the type definition

relationshipType - The name of the relationship in the graph

relationshipDirection - The direction of the relationship in the graph

Returns:

A FieldInfo or null if none exists

getIterableField

public static FieldInfo getIterableField(ClassInfo classInfo,
 Class<?> parameterType,
 String relationshipType,
 Relationship.Direction relationshipDirection)

Returns an FieldWriter for an iterable of a non-primitive scalar type defined by a ClassInfo

Parameters:

classInfo - the ClassInfo (or a superclass thereof) declaring the iterable relationship

relationshipType - the name of the relationship as it is in the graph

relationshipDirection - the direction of the relationship as it is in the graph

parameterType - the type that will be iterated over

Returns:

a valid FieldWriter or null if none is found