Package net.sf.saxon.trace

Class CountingFilter

java.lang.Object
net.sf.saxon.event.SequenceReceiver
net.sf.saxon.event.ProxyReceiver
net.sf.saxon.trace.CountingFilter
All Implemented Interfaces:
Result, Receiver
public class CountingFilter extends ProxyReceiver
A filter that can be inserted into a Receiver pipeline to count the events that pass through. This class is not normally used in Saxon, but is available for diagnostics when needed. Note that the counters are only maintained if Instrumentation.ACTIVE is set to true. The counters can be displayed by calling Instrumentation.report().

  • Constructor Details

    • CountingFilter

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

    • CountingFilter

      public CountingFilter(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, Location locationId, int copyNamespaces) throws XPathException
      Append an arbitrary item (node or atomic value) to the output
      Specified by:
      append in interface Receiver
      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 ReceiverOption.ALL_NAMESPACES; the default (0) means
      Throws:
      XPathException - if an error occurs

    • characters

      public void characters(UnicodeString chars, Location locationId, int properties) throws XPathException
      Character data
      Specified by:
      characters in interface Receiver
      Overrides:
      characters in class ProxyReceiver
      Parameters:
      chars - The characters
      locationId - provides information such as line number and system ID.
      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(UnicodeString chars, Location 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 - provides information such as line number and system ID.
      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

    • 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, UnicodeString data, Location 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 - provides information such as line number and system ID.
      properties - Additional information about the PI.
      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 - properties of the document node
      Throws:
      XPathException - if an error occurs

    • startElement

      public void startElement(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties) throws XPathException
      Notify the start of an element
      Specified by:
      startElement in interface Receiver
      Overrides:
      startElement in class ProxyReceiver
      Parameters:
      elemName - the name of the element.
      type - the type annotation of the element.
      attributes - the attributes of this element
      namespaces - the in-scope namespaces of this element: generally this is all the in-scope namespaces, without relying on inheriting namespaces from parent elements
      location - an object providing information about the module, line, and column where the node originated
      properties - bit-significant properties of the element node. If there are no relevant properties, zero is supplied. The definitions of the bits are in class ReceiverOption
      Throws:
      XPathException - if an error occurs