KeySelectorWatch

java.lang.Object
- com.saxonica.ee.stream.watch.AbstractWatch
- - com.saxonica.ee.stream.watch.PatternWatch
  - - com.saxonica.ee.validate.SelectorWatch
    - - com.saxonica.ee.validate.KeySelectorWatch

All Implemented Interfaces:

Watch
```
public class KeySelectorWatch
extends SelectorWatch
```
This class watches the selector for a key or unique constraint

Constructor Summary

Constructors
Constructor Description

KeySelectorWatch(ConstraintChecker checker, IdentityConstraint uniqueConstraint)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addKeyRef(RefSelectorWatch watch)`	Add a RefSelectorWatch to support a keyRef that refers to this key or unique constraints
`protected void`	`checkRow(AtomicSequence[] currentRow, boolean isTarget, Location locationId)`	Method to check that a row (that is, the collection of fields corresponding to one selected node) is valid.

Methods inherited from class com.saxonica.ee.validate.SelectorWatch
close, endSelectedParentNode, reportValidationError, startSelectedParentNode

Methods inherited from class com.saxonica.ee.stream.watch.PatternWatch
getAnchorNode, getSelection, matchesNode, matchesNodesOfKind, open, processItem, setAnchorNode, setSelection

Methods inherited from class com.saxonica.ee.stream.watch.AbstractWatch
getNamespaceResolver, getPipelineConfiguration, setNamespaceResolver, setPipelineConfiguration

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

- Constructor Detail
  - KeySelectorWatch
```
public KeySelectorWatch(ConstraintChecker checker,
                        IdentityConstraint uniqueConstraint)
```
- Method Detail
  - addKeyRef
```
public void addKeyRef(RefSelectorWatch watch)
```
    Add a RefSelectorWatch to support a keyRef that refers to this key or unique constraints
    
    Parameters:
    
    watch - the RefSelectorWatch which needs to be notified of all values encountered for this key
  - checkRow
```
protected void checkRow(AtomicSequence[] currentRow,
                        boolean isTarget,
                        Location locationId)
                 throws XPathException
```
    Method to check that a row (that is, the collection of fields corresponding to one selected node) is valid. This implentation augments that in the superclass by notifying all interested keyref's of the values in this row.
    
    Overrides:
    
    checkRow in class SelectorWatch
    
    Parameters:
    
    currentRow - the values of the set of fields
    
    isTarget - set to true if this is a value of the key referred to by a key reference, rather than a value for this constraint's own selected fields.
    
    locationId - identifies the location of the selected node
    
    Throws:
    
    ValidationException - May be raised if the value of the row (that is, the combination of fields) violates the constraint
    
    XPathException