Class TracingFilter

All Implemented Interfaces:
Result, Receiver

public class TracingFilter extends ProxyReceiver
A filter that can be inserted into a Receiver pipeline to trace the events that pass through. This class is not normally used in Saxon, but is available for diagnostics when needed.
  • Constructor Details

    • TracingFilter

      public TracingFilter(Receiver nextReceiver)
      Create a TracingFilter and allocate a unique Id.
      Parameters:
      nextReceiver - the underlying receiver to which the events will be sent
    • TracingFilter

      public TracingFilter(Receiver nextReceiver, PrintStream diagnosticOutput)
      Create a TracingFilter, allocate a unique Id, and supply the destination for diagnostic trace messages
      Parameters:
      nextReceiver - the underlying receiver to which the events will be sent
      diagnosticOutput - the destination for diagnostic trace messages
  • Method Details

    • getId

      public int getId()
      Get the unique id that was allocated to this TracingFilter
      Returns:
      the unique id (which is included in all diagnostic messages)
    • append

      public void append(Item item, int locationId, int copyNamespaces) throws XPathException
      Append an arbitrary item (node or atomic value) to the output
      Overrides:
      append in class ProxyReceiver
      Parameters:
      item - the item to be appended
      locationId - the location of the calling instruction, for diagnostics
      copyNamespaces - if the item is an element node, this indicates whether its namespaces need to be copied. Values are NodeInfo.ALL_NAMESPACES, NodeInfo.LOCAL_NAMESPACES, NodeInfo.NO_NAMESPACES
      Throws:
      XPathException - if the operation fails
    • attribute

      public void attribute(NodeName nameCode, SimpleType typeCode, 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.
      Specified by:
      attribute in interface Receiver
      Overrides:
      attribute in class ProxyReceiver
      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
      value - the string value of the attribute
      locationId - an integer which can be interpreted using a LocationProvider 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:
      XPathException - if an error occurs
    • characters

      public void characters(CharSequence chars, int locationId, int properties) throws XPathException
      Character data
      Specified by:
      characters in interface Receiver
      Overrides:
      characters in class ProxyReceiver
      Parameters:
      chars - The characters
      locationId - an integer which can be interpreted using a LocationProvider 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
      Throws:
      XPathException - if an error occurs
    • close

      public void close() throws XPathException
      End of document
      Specified by:
      close in interface Receiver
      Overrides:
      close in class ProxyReceiver
      Throws:
      XPathException - if an error occurs
    • comment

      public void comment(CharSequence chars, int locationId, int properties) throws XPathException
      Output a comment
      Specified by:
      comment in interface Receiver
      Overrides:
      comment in class ProxyReceiver
      Parameters:
      chars - The content of the comment
      locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
      properties - Additional information about the comment.
      Throws:
      XPathException - if an error occurs
    • endDocument

      public void endDocument() throws XPathException
      Notify the end of a document node
      Specified by:
      endDocument in interface Receiver
      Overrides:
      endDocument in class ProxyReceiver
      Throws:
      XPathException - if an error occurs
    • endElement

      public void endElement() throws XPathException
      End of element
      Specified by:
      endElement in interface Receiver
      Overrides:
      endElement in class ProxyReceiver
      Throws:
      XPathException - if an error occurs
    • namespace

      public void namespace(NamespaceBinding namespaceBinding, int properties) throws XPathException
      Notify a namespace. Namespaces are notified after the startElement event, and before any children for the element. The namespaces that are reported are only required to include those that are different from the parent element; however, duplicates may be reported. A namespace must not conflict with any namespaces already used for element or attribute names.
      Specified by:
      namespace in interface Receiver
      Overrides:
      namespace in class ProxyReceiver
      Parameters:
      namespaceBinding - the namespace (prefix, uri) pair to be notified
      properties - any special properties to be passed on this call
      Throws:
      XPathException - if an error occurs
    • open

      public void open() throws XPathException
      Start of event stream
      Specified by:
      open in interface Receiver
      Overrides:
      open in class ProxyReceiver
      Throws:
      XPathException - if an error occurs
    • processingInstruction

      public void processingInstruction(String target, CharSequence data, int locationId, int properties) throws XPathException
      Processing Instruction
      Specified by:
      processingInstruction in interface Receiver
      Overrides:
      processingInstruction in class ProxyReceiver
      Parameters:
      target - The PI name. This must be a legal name (it will not be checked).
      data - The data portion of the processing instruction
      locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
      properties - Additional information about the PI.
      Throws:
      XPathException - if an error occurs
    • startContent

      public void startContent() throws XPathException
      Notify the start of the content, that is, the completion of all attributes and namespaces. Note that the initial receiver of output from XSLT instructions will not receive this event, it has to detect it itself. Note that this event is reported for every element even if it has no attributes, no namespaces, and no content.
      Specified by:
      startContent in interface Receiver
      Overrides:
      startContent in class ProxyReceiver
      Throws:
      XPathException - if an error occurs
    • startDocument

      public void startDocument(int properties) throws XPathException
      Start of a document node.
      Specified by:
      startDocument in interface Receiver
      Overrides:
      startDocument in class ProxyReceiver
      Parameters:
      properties - bit-significant integer indicating properties of the document node. The definitions of the bits are in class ReceiverOptions
      Throws:
      XPathException - if an error occurs
    • startElement

      public void startElement(NodeName nameCode, SchemaType typeCode, int locationId, int properties) throws XPathException
      Notify the start of an element
      Specified by:
      startElement in interface Receiver
      Overrides:
      startElement in class ProxyReceiver
      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.
      locationId - an integer which can be interpreted using a LocationProvider to return information such as line number and system ID. If no location information is available, the value zero is supplied.
      properties - properties of the element node
      Throws:
      XPathException - if an error occurs