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## org.apache.cayenne.reflect
Interface ToManyMapProperty

All Superinterfaces:
  ArcProperty, Property, ToManyProperty

    public interface ToManyMapProperty

extends ToManyProperty

A property representing a map of objects keyed by one of the object properties.

Since:
  3.0

Method Summary
`Object` | `getMapKey(Object target)` Extracts the map key of the target object.

Methods inherited from interface org.apache.cayenne.reflect.ToManyProperty
`addTarget, addTargetDirectly, removeTarget, removeTargetDirectly`

Methods inherited from interface org.apache.cayenne.reflect.ArcProperty
`getComplimentaryReverseArc, getRelationship, getTargetDescriptor, invalidate, isFault`

Methods inherited from interface org.apache.cayenne.reflect.Property
`getName, injectValueHolder, readProperty, readPropertyDirectly, visit, writeProperty, writePropertyDirectly`

Method Detail

### getMapKey

    Object getMapKey(Object target)
                     throws PropertyException

  Extracts the map key of the target object.

  Throws:
    `PropertyException`

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