Package net.sf.saxon.event

Class TreeReceiver

java.lang.Object

net.sf.saxon.event.SequenceReceiver

net.sf.saxon.event.TreeReceiver

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

public class TreeReceiver
extends SequenceReceiver

A TreeReceiver acts as a bridge between a SequenceReceiver, which can receive events for constructing any kind of sequence, and an ordinary Receiver, which only handles events relating to the building of trees. To do this, it has to process any items added to the sequence using the append() interface; all other events are passed through unchanged.

If atomic items are appended to the sequence, then adjacent atomic items are turned in to a text node by converting them to strings and adding a single space as a separator.

If a document node is appended to the sequence, then the document node is ignored and its children are appended to the sequence.

If any other node is appended to the sequence, then it is pushed to the result as a sequence of Receiver events, which may involve walking recursively through the contents of a tree.

Field Summary

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

Constructors

Constructor	Description
TreeReceiver(Receiver nextInChain)	Create a TreeReceiver

Method Summary

Modifier and Type	Method	Description
void	append(Item item, Location locationId, int copyNamespaces)	Append an arbitrary item (node or atomic value) to the output
void	characters(UnicodeString chars, Location locationId, int properties)	Character data
void	close()	End of event sequence
void	comment(UnicodeString chars, Location locationId, int properties)	Output a comment
void	endDocument()	Notify the end of a document node
void	endElement()	End of element
Receiver	getNextReceiver()	Get the underlying Receiver (that is, the next one in the pipeline)
void	open()	Start of event sequence
void	processingInstruction(java.lang.String target, UnicodeString data, Location locationId, int properties)	Processing Instruction
void	setPipelineConfiguration(PipelineConfiguration pipe)	Set the pipeline configuration
void	setSystemId(java.lang.String systemId)	Set the system ID
void	setUnparsedEntity(java.lang.String name, java.lang.String uri, java.lang.String publicId)	Set the URI for an unparsed entity in the document.
void	startDocument(int properties)	Start of a document node.
void	startElement(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties)	Notify the start of an element
boolean	usesTypeAnnotations()	Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events

Methods inherited from class net.sf.saxon.event.SequenceReceiver

append, decompose, flatten, getConfiguration, getErrorCodeForDecomposingFunctionItems, getNamePool, getPipelineConfiguration, getSystemId, handlesAppend

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TreeReceiver

public TreeReceiver(Receiver nextInChain)

Create a TreeReceiver

Parameters:

nextInChain - the receiver to which events will be directed, after expanding append events into more primitive tree-based events

Method Detail

setSystemId

public void setSystemId(java.lang.String systemId)

Description copied from class: SequenceReceiver

Set the system ID

Specified by:

setSystemId in interface javax.xml.transform.Result

Overrides:

setSystemId in class SequenceReceiver

Parameters:

systemId - the URI used to identify the tree being passed across this interface

setPipelineConfiguration

public void setPipelineConfiguration(PipelineConfiguration pipe)

Description copied from interface: Receiver

Set the pipeline configuration

Specified by:

setPipelineConfiguration in interface Receiver

Overrides:

setPipelineConfiguration in class SequenceReceiver

Parameters:

pipe - the pipeline configuration

getNextReceiver

public Receiver getNextReceiver()

Get the underlying Receiver (that is, the next one in the pipeline)

Returns:

the underlying Receiver

open

public void open()
          throws XPathException

Start of event sequence

Specified by:

open in interface Receiver

Overrides:

open in class SequenceReceiver

Throws:

XPathException - if an error occurs

close

public void close()
           throws XPathException

End of event sequence

Throws:

XPathException - if an error occurs

startDocument

public void startDocument(int properties)
                   throws XPathException

Start of a document node.

Parameters:

properties - bit-significant integer indicating properties of the document node. The definitions of the bits are in class ReceiverOption

Throws:

XPathException - if an error occurs

endDocument

public void endDocument()
                 throws XPathException

Notify the end of a 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

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

endElement

public void endElement()
                throws XPathException

End of element

Throws:

XPathException - if an error occurs

characters

public void characters(UnicodeString chars,
                       Location locationId,
                       int properties)
                throws XPathException

Character data

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

processingInstruction

public void processingInstruction(java.lang.String target,
                                  UnicodeString data,
                                  Location locationId,
                                  int properties)
                           throws XPathException

Processing Instruction

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

comment

public void comment(UnicodeString chars,
                    Location locationId,
                    int properties)
             throws XPathException

Output a comment

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

setUnparsedEntity

public void setUnparsedEntity(java.lang.String name,
                              java.lang.String uri,
                              java.lang.String publicId)
                       throws XPathException

Set the URI for an unparsed entity in the document.

Specified by:

setUnparsedEntity in interface Receiver

Overrides:

setUnparsedEntity in class SequenceReceiver

Parameters:

name - The name of the unparsed entity

uri - The system identifier of the unparsed entity

publicId - The public identifier of the unparsed entity

Throws:

XPathException - if an error occurs

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

Specified by:

append in class SequenceReceiver

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

usesTypeAnnotations

public boolean usesTypeAnnotations()

Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events

Returns:

true if the Receiver makes any use of this information. If false, the caller may supply untyped nodes instead of supplying the type annotation