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## com.saxonica.validate
Class FieldChecker

    java.lang.Object
      com.saxonica.Checker
          com.saxonica.validate.FieldChecker

All Implemented Interfaces:
  Receiver, javax.xml.transform.Result

public class FieldChecker
extends com.saxonica.Checker

A FieldChecker is instantiated when a field in an identity constraint is matched; it receives notification of all events until the end of the element (or attribute) that matched the selector.

Field Summary

Fields inherited from interface javax.xml.transform.Result
`PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING`

Constructor Summary
`FieldChecker(SelectorWatch parentWatch, Selection selection, Value[] currentRow, int column)` Create a new FieldWatch

Method Summary
`void` | `attribute(int nameCode, int typeCode, java.lang.CharSequence value, int locationId, int properties)` Notify an attribute.
`void` | `characters(java.lang.CharSequence chars, int locationId, int properties)` Notify character data.
`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` | `endElement()` Notify the end of an element.
`void` | `setNamespaceResolver(NamespaceResolver resolver)` Set a NamespaceResolver for use by the FieldChecker
`void` | `startElement(int nameCode, int typeCode, int locationId, int properties)` Notify the start of an element

Methods inherited from class com.saxonica.Checker
`comment, endDocument, getConfiguration, getPipelineConfiguration, getSystemId, namespace, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnparsedEntity, startContent, startDocument`

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

Constructor Detail

### FieldChecker

    public FieldChecker(SelectorWatch parentWatch,
                        Selection selection,
                        Value[] currentRow,
                        int column)

  Create a new FieldWatch

Parameters:
  `parentWatch` - The SelectorWatch to which field values should be notified
  `selection` - The selection (that is, the restricted XPath expression) used in this field of the constraint
  `currentRow` - represents the selected node whose fields are being evaluated
  `column` - sequence number for this field within the constraint being evaluated

Method Detail

### setNamespaceResolver

    public void setNamespaceResolver(NamespaceResolver resolver)

  Set a NamespaceResolver for use by the FieldChecker

### startElement

    public void startElement(int nameCode,
                             int typeCode,
                             int locationId,
                             int properties)
                      throws XPathException

  Notify the start of an element

  Parameters:
    `nameCode` - integer code identifying the name of the element within the name pool.
    `typeCode` - integer code identifying the element's type within the name pool. The value -1 indicates the default type, xdt:untyped.
    `locationId` - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - bit-significant properties of the element node. If there are no revelant properties, zero is supplied.
  Throws:
    `XPathException`

### attribute

    public void attribute(int nameCode,
                          int typeCode,
                          java.lang.CharSequence value,
                          int locationId,
                          int properties)
                   throws XPathException

  Notify an attribute. Attributes are notified after the startElement event, and before any children. Namespaces and attributes may be intermingled.

  Parameters:
    `nameCode` - The name of the attribute, as held in the name pool
    `typeCode` - The type of the attribute, as held in the name pool
    `locationId` - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - Bit significant value. The following bits are defined:
  DISABLE_ESCAPING
    Disable escaping for this attribute
  NO_SPECIAL_CHARACTERS
    Attribute value contains no special characters
  Throws:
    `IllegalStateException:` - attempt to output an attribute when there is no open element start tag
    `XPathException`

### characters

    public void characters(java.lang.CharSequence chars,
                           int locationId,
                           int properties)
                    throws XPathException

  Notify character data. Note that some receivers may require the character data to be sent in a single event, but in general this is not a requirement.

  Parameters:
    `chars` - The characters
    `locationId` - an integer which can be interpreted using a LocationMap to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - Bit significant value. The following bits are defined:
  DISABLE_ESCAPING
    Disable escaping for this text node
  USE_CDATA
    Output as a CDATA section
  NO_SPECIAL_CHARACTERS
    Value contains no special characters
  WHITESPACE
    Text is all whitespace
  Throws:
    `XPathException`

### endElement

    public void endElement()
                    throws XPathException

  Description copied from interface: `Receiver`
  Notify the end of an element. The receiver must maintain a stack if it needs to know which element is ending.

  Throws:
    `XPathException`

### close

    public 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.

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