net.sf.saxon.event
Class TracingFilter

java.lang.Object
  extended by net.sf.saxon.event.SequenceReceiver
      extended by net.sf.saxon.event.ProxyReceiver
          extended by net.sf.saxon.event.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.


Field Summary
 
Fields inherited from class net.sf.saxon.event.ProxyReceiver
nextReceiver
 
Fields inherited from class net.sf.saxon.event.SequenceReceiver
pipelineConfiguration, previousAtomic, systemId
 
Fields inherited from interface javax.xml.transform.Result
PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING
 
Constructor Summary
TracingFilter(Receiver nextReceiver)
          Create a TracingFilter and allocate a unique Id.
TracingFilter(Receiver nextReceiver, PrintStream diagnosticOutput)
          Create a TracingFilter, allocate a unique Id, and supply the destination for diagnostic trace messages
 
Method Summary
 void append(Item item, int locationId, int copyNamespaces)
          Append an arbitrary item (node or atomic value) to the output
 void attribute(NodeName nameCode, SimpleType typeCode, CharSequence value, int locationId, int properties)
          Notify an attribute.
 void characters(CharSequence chars, int locationId, int properties)
          Character data
 void close()
          End of document
 void comment(CharSequence chars, int locationId, int properties)
          Output a comment
 void endDocument()
          Notify the end of a document node
 void endElement()
          End of element
 int getId()
          Get the unique id that was allocated to this TracingFilter
 void namespace(NamespaceBinding namespaceBinding, int properties)
          Notify a namespace.
 void open()
          Start of event stream
 void processingInstruction(String target, CharSequence data, int locationId, int properties)
          Processing Instruction
 void startContent()
          Notify the start of the content, that is, the completion of all attributes and namespaces.
 void startDocument(int properties)
          Start of a document node.
 void startElement(NodeName nameCode, SchemaType typeCode, int locationId, int properties)
          Notify the start of an element
 
Methods inherited from class net.sf.saxon.event.ProxyReceiver
getNamePool, getUnderlyingReceiver, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, usesTypeAnnotations
 
Methods inherited from class net.sf.saxon.event.SequenceReceiver
append, getConfiguration, getPipelineConfiguration, getSystemId
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

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 Detail

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
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
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.
Throws:
IllegalStateException: - attempt to output an attribute when there is no open element start tag
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:
IllegalStateException: - attempt to output a namespace when there is no open element start tag
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.
properties - properties of the element node
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.
Throws:
XPathException - if an error occurs


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.