# Class IdMapKeyAccessor

java.lang.Object
org.apache.cayenne.reflect.IdMapKeyAccessor

All Implemented Interfaces:
  `Serializable, Accessor`

public class IdMapKeyAccessor extends Object implements Accessor
A stateless read-only accessor of the map key value that is based on the Persistent object id. For single-column ID's the accessor returns a single value (e.g. an Integer). For multi-column ID's it returns the ObjectId.

Since:
  3.0
See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final Accessor`
  `SHARED_ACCESSOR`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `IdMapKeyAccessor()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `String`
  `getName()`
  Returns property name.
  `Object`
  `getValue(Object object)`
  Returns a property value of an object without disturbing the object fault status.
  `void`
  `setValue(Object object, Object newValue)`
  Sets a property value of an object without disturbing the object fault status.

  ### Methods inherited from class Object

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

- ## Field Details

  - ### SHARED_ACCESSOR

    public static final Accessor SHARED_ACCESSOR

- ## Constructor Details

  - ### IdMapKeyAccessor

    public IdMapKeyAccessor()

- ## Method Details

  - ### getName

    public String getName()
    Description copied from interface: `Accessor`
    Returns property name.
    Specified by:
      `getName` in interface `Accessor`

  - ### getValue

    public Object getValue(Object object) throws PropertyException
    Description copied from interface: `Accessor`
    Returns a property value of an object without disturbing the object fault status.
    Specified by:
      `getValue` in interface `Accessor`
    Throws:
      `PropertyException`

  - ### setValue

    public void setValue(Object object, Object newValue) throws PropertyException
    Description copied from interface: `Accessor`
    Sets a property value of an object without disturbing the object fault status. Old value of the property is specified as a hint.
    Specified by:
      `setValue` in interface `Accessor`
    Throws:
      `PropertyException`