## com.saxonica.validate
Class RefSelectorWatch

    java.lang.Object
      com.saxonica.validate.SelectorWatch
          com.saxonica.validate.RefSelectorWatch

All Implemented Interfaces:
  Watch

    public class RefSelectorWatch

extends SelectorWatch

This class watches the selector for a keyref constraint

Constructor Summary
`RefSelectorWatch(ConstraintChecker checker, IdentityConstraint uniqueConstraint)`

Method Summary
`void` `close()` The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope.
`void` `notifyActualKey(Value[] keyValue)`

Methods inherited from class com.saxonica.validate.SelectorWatch
`activate, addFieldValue, deactivate, getIdentityConstraint, getOriginDepth, getSelection, setNamespaceResolver, setOriginDepth, setPipelineConfiguration`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RefSelectorWatch

    public RefSelectorWatch(ConstraintChecker checker,
                            IdentityConstraint uniqueConstraint)

Method Detail

### notifyActualKey

    public void notifyActualKey(Value[] keyValue)
                         throws ValidationException

  Throws:
    `ValidationException`

### close

    public void close()
               throws ValidationException

  The close() method is called immediately before the Watch is destroyed, that is, when the element whose declaration scopes the constraint implemented by this Watch goes out of scope. This implementation searches the list of all key values encountered looking (a) for key references that reference no corresponding key value (b) for key references that reference more than one corresponding key value (which can happen if the keyref and the key are defined at different levels of hierarchy.

  Specified by:
    `close` in interface `Watch`
  Overrides:
    `close` in class `SelectorWatch`
  Throws:
    `ValidationException`

Copyright (C) Michael H. Kay. All rights reserved.