net.sf.saxon.serialize

Class Emitter

java.lang.Object

net.sf.saxon.event.SequenceReceiver

net.sf.saxon.serialize.Emitter

All Implemented Interfaces:

Result, Receiver

Direct Known Subclasses:

BinaryEmitter, PTreeEmitter, XMLEmitter

public abstract class Emitter
extends SequenceReceiver
implements Result

Emitter: This abstract class defines methods that must be implemented by components that format SAXON output. There is one emitter for XML, one for HTML, and so on. Additional methods are concerned with setting options and providing a Writer.

The interface is deliberately designed to be as close as possible to the standard SAX2 ContentHandler interface, however, it allows additional information to be made available.

An Emitter is a Receiver, specifically it is a Receiver that can direct output to a Writer or OutputStream, using serialization properties defined in a Properties object.

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	allCharactersEncodable
protected CharacterSet	characterSet
protected Properties	outputProperties
protected OutputStream	outputStream
protected StreamResult	streamResult
protected Writer	writer

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 and Description
Emitter()

Method Summary

Methods

Modifier and Type	Method and Description
void	append(Item item, Location locationId, int copyNamespaces) Append an arbitrary item (node or atomic value) to the output
void	close() Notify the end of the event stream
Properties	getOutputProperties() Get the output properties
OutputStream	getOutputStream() Get the output stream
Writer	getWriter() Get the output writer
protected OutputStream	makeOutputStream()
protected void	makeWriter() Make a Writer for this Emitter to use, given a StreamResult.
void	setOutputProperties(Properties details) Set output properties
void	setOutputStream(OutputStream stream) Set the output destination as a byte stream.
void	setStreamResult(StreamResult result) Set the StreamResult acting as the output destination of the Emitter
void	setUnparsedEntity(String name, String uri, String publicId) Set unparsed entity URI.
void	setWriter(Writer writer) Set the output destination as a character stream
boolean	usesTypeAnnotations() Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events
boolean	usesWriter() Determine whether the Emitter wants a Writer for character output or an OutputStream for binary output.

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

append, getConfiguration, getNamePool, getPipelineConfiguration, getSystemId, isTrueSequenceReceiver, open, setPipelineConfiguration, setSystemId

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.xml.transform.Result

getSystemId, setSystemId

Methods inherited from interface net.sf.saxon.event.Receiver

attribute, characters, comment, endDocument, endElement, namespace, processingInstruction, startContent, startDocument, startElement

Field Detail

streamResult

protected StreamResult streamResult

writer

protected Writer writer

outputStream

protected OutputStream outputStream

outputProperties

protected Properties outputProperties

characterSet

protected CharacterSet characterSet

allCharactersEncodable

protected boolean allCharactersEncodable

Constructor Detail

Emitter

public Emitter()

Method Detail

setOutputProperties

public void setOutputProperties(Properties details)
                         throws XPathException

Set output properties

Parameters:

details - the output serialization properties

Throws:

XPathException - if an error occurs finding the encoding property

getOutputProperties

public Properties getOutputProperties()

Get the output properties

Returns:

the output serialization properties. The returned value will be null if setOutputProperties() has not been called

setStreamResult

public void setStreamResult(StreamResult result)
                     throws XPathException

Set the StreamResult acting as the output destination of the Emitter

Parameters:

result - the output destination

Throws:

XPathException - if an error occurs

makeWriter

protected void makeWriter()
                   throws XPathException

Make a Writer for this Emitter to use, given a StreamResult.

Throws:

XPathException - if an error occurs

makeOutputStream

protected OutputStream makeOutputStream()
                                 throws XPathException

Throws:

XPathException

usesWriter

public boolean usesWriter()

Determine whether the Emitter wants a Writer for character output or an OutputStream for binary output. The standard Emitters all use a Writer, so this returns true; but a subclass can override this if it wants to use an OutputStream

Returns:

true if a Writer is needed, as distinct from an OutputStream

setWriter

public void setWriter(Writer writer)
               throws XPathException

Set the output destination as a character stream

Parameters:

writer - the Writer to use as an output destination

Throws:

XPathException - if an error occurs

getWriter

public Writer getWriter()

Get the output writer

Returns:

the Writer being used as an output destination, if any

setOutputStream

public void setOutputStream(OutputStream stream)
                     throws XPathException

Set the output destination as a byte stream.

Note that if a specific encoding (other than the default, UTF-8) is required, then setOutputProperties(java.util.Properties) must be called before calling this method.

Parameters:

stream - the OutputStream being used as an output destination

Throws:

XPathException - if an error occurs

getOutputStream

public OutputStream getOutputStream()

Get the output stream

Returns:

the OutputStream being used as an output destination, if any

setUnparsedEntity

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

Set unparsed entity URI. Needed to satisfy the Receiver interface, but not used, because unparsed entities can occur only in input documents, not in output documents.

Specified by:

setUnparsedEntity in interface Receiver

Overrides:

setUnparsedEntity in class SequenceReceiver

Parameters:

name - the entity name

uri - the entity system ID

publicId - the entity public ID

Throws:

XPathException - if an error occurs

close

public void close()
           throws XPathException

Notify the end of the event stream

Specified by:

close in interface Receiver

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

Specified by:

usesTypeAnnotations in interface Receiver

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 (or conversely, it may avoid stripping unwanted type annotations)

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 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 NodeInfo.ALL_NAMESPACES, NodeInfo.LOCAL_NAMESPACES, NodeInfo.NO_NAMESPACES

Throws:

XPathException - if the operation fails