net.sf.saxon.event

Class SequenceWriter

java.lang.Object

net.sf.saxon.event.SequenceReceiver

net.sf.saxon.event.SequenceWriter

All Implemented Interfaces:

javax.xml.transform.Result, Receiver

Direct Known Subclasses:

AdaptiveEmitter, JSONSerializer, SequenceFilter, SequenceOutputter, StreamingSequenceWriter

public abstract class SequenceWriter
extends SequenceReceiver

The SequenceWriter is used when writing a sequence of items, for example, when xsl:variable is used with content and an "as" attribute. The SequenceWriter builds the sequence; the concrete subclass is responsible for deciding what to do with the resulting items.

Items may be supplied in either "composed" form (by calling the SequenceReceiver.append(Item) method, or in "decomposed" form (by a sequence of calls representing XML push events: startDocument(int), startElement(NodeName, SchemaType, Location, int), and so on. When items are supplied in decomposed form, a tree will be built, and the resulting document or element node is then written to the sequence in the same way as if it were supplied directly as a NodeInfo item.

This class is not used to build temporary trees. For that, the ComplexContentOutputter is used. The ComplexContentOutputter provides richer functionality than this class: it detects illegal sequences of events, detects duplicate or inconsistent attributes and namespaces, performs namespace fixup, allocates prefixes where necessary, and detects where it is necessary to call startContent() to mark the end of a start tag. By contrast, this class should only be used where it is known that the sequence of events is complete and consistent.

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 and Description
SequenceWriter(PipelineConfiguration pipe)

Method Summary

Modifier and Type	Method and Description
void	append(Item item, Location locationId, int copyNamespaces) Append an arbitrary item (node, atomic value, or function) to the output
void	attribute(NodeName attName, SimpleType typeCode, java.lang.CharSequence value, Location locationId, int properties) Notify an attribute.
void	bulkCopyElementNode(TinyElementImpl node, int copyOptions)
void	characters(java.lang.CharSequence s, Location locationId, int properties) Notify character data.
void	close() Notify the end of the event stream
void	comment(java.lang.CharSequence comment, Location locationId, int properties) Notify a comment.
void	endDocument() Notify the end of a document node
void	endElement() Notify the end of an element.
TreeModel	getTreeModel() Get the tree model that will be used for creating trees when events are written to the sequence
void	graftElementNode(TinyElementImpl node, int copyOptions)
boolean	isReadyForBulkCopy()
boolean	isReadyForGrafting()
void	namespace(NamespaceBindingSet namespaceBindings, int properties) Notify one or more namespaces.
void	processingInstruction(java.lang.String target, java.lang.CharSequence data, Location locationId, int properties) Output a processing instruction
void	setTreeModel(TreeModel treeModel) Set the tree model that will be used for creating trees when events are written to the sequence
void	setUnparsedEntity(java.lang.String name, java.lang.String systemID, java.lang.String publicID) Notify an unparsed entity URI.
void	startContent() Notify the start of the content, that is, the completion of all attributes and namespaces.
void	startDocument(int properties) Notify the start of a document node
void	startElement(NodeName elemName, SchemaType typeCode, 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.
abstract void	write(Item item) Abstract method to be supplied by subclasses: output one item in the sequence.

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

append, decompose, flatten, getConfiguration, getErrorCodeForDecomposingFunctionItems, getNamePool, getPipelineConfiguration, getSystemId, handlesAppend, open, setPipelineConfiguration, setSystemId

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceWriter

public SequenceWriter(PipelineConfiguration pipe)

Method Detail

write

public abstract void write(Item item)
                    throws XPathException

Abstract method to be supplied by subclasses: output one item in the sequence.

Parameters:

item - the item to be written to the sequence

Throws:

XPathException - if any failure occurs while writing the item

startDocument

public void startDocument(int properties)
                   throws XPathException

Description copied from interface: Receiver

Notify the start of a document node

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

setUnparsedEntity

public void setUnparsedEntity(java.lang.String name,
                              java.lang.String systemID,
                              java.lang.String publicID)
                       throws XPathException

Description copied from class: SequenceReceiver

Notify an unparsed entity URI.

Specified by:

setUnparsedEntity in interface Receiver

Overrides:

setUnparsedEntity in class SequenceReceiver

Parameters:

name - The name of the unparsed entity

systemID - The system identifier of the unparsed entity

publicID - The public identifier of the unparsed entity

Throws:

XPathException - if an error occurs

getTreeModel

public TreeModel getTreeModel()

Get the tree model that will be used for creating trees when events are written to the sequence

Returns:

the tree model, if one has been set using setTreeModel(); otherwise null

setTreeModel

public void setTreeModel(TreeModel treeModel)

Set the tree model that will be used for creating trees when events are written to the sequence

Parameters:

treeModel - the tree model to be used. If none has been set, the default tree model for the configuration is used, unless a mutable tree is required and the default tree model is not mutable, in which case a linked tree is used.

endDocument

public void endDocument()
                 throws XPathException

Description copied from interface: Receiver

Notify the end of a document node

Throws:

XPathException - if an error occurs

startElement

public void startElement(NodeName elemName,
                         SchemaType typeCode,
                         Location location,
                         int properties)
                  throws XPathException

Description copied from interface: Receiver

Notify the start of an element

Parameters:

elemName - the name of the element.

typeCode - the type annotation of the element.

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 revelant properties, zero is supplied. The definitions of the bits are in class ReceiverOptions

Throws:

XPathException - if an error occurs

endElement

public void endElement()
                throws XPathException

Description copied from interface: Receiver

Notify the end of an element. The receiver must maintain a stack if it needs to know which element is ending.

Throws:

XPathException - if an error occurs

namespace

public void namespace(NamespaceBindingSet namespaceBindings,
                      int properties)
               throws XPathException

Description copied from interface: Receiver

Notify one or more namespaces. 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. The events represent namespace declarations and undeclarations rather than in-scope namespace nodes: an undeclaration is represented by a namespace code of zero. If the sequence of namespace events contains two A namespace must not conflict with any namespaces already used for element or attribute names.

Parameters:

namespaceBindings - contains the namespace prefix and namespace URI

properties - The most important property is REJECT_DUPLICATES. If this property is set, the namespace declaration will be rejected if it conflicts with a previous declaration of the same prefix. If the property is not set, the namespace declaration will be ignored if it conflicts with a previous declaration. This reflects the fact that when copying a tree, namespaces for child elements are emitted before the namespaces of their parent element. Unfortunately this conflicts with the XSLT rule for complex content construction, where the recovery action in the event of conflicts is to take the namespace that comes last. XSLT therefore doesn't recover from this error:

Throws:

XPathException - if an error occurs

attribute

public void attribute(NodeName attName,
                      SimpleType typeCode,
                      java.lang.CharSequence value,
                      Location locationId,
                      int properties)
               throws XPathException

Description copied from interface: Receiver

Notify an attribute. Attributes are notified after the startElement event, and before any children. Namespaces and attributes may be intermingled.

Parameters:

attName - The name of the attribute

typeCode - The type annotation of the attribute

value - the string value of the attribute

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 attribute

NO_SPECIAL_CHARACTERS

Attribute value contains no special characters

Throws:

XPathException - if an error occurs

startContent

public void startContent()
                  throws XPathException

Description copied from interface: Receiver

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.

Throws:

XPathException - if an error occurs

characters

public void characters(java.lang.CharSequence s,
                       Location locationId,
                       int properties)
                throws XPathException

Description copied from interface: Receiver

Notify character data. Note that some receivers may require the character data to be sent in a single event, but in general this is not a requirement.

Parameters:

s - 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

comment

public void comment(java.lang.CharSequence comment,
                    Location locationId,
                    int properties)
             throws XPathException

Description copied from interface: Receiver

Notify a comment. Comments are only notified if they are outside the DTD.

Parameters:

comment - 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

processingInstruction

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

Description copied from interface: Receiver

Output a 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

close

public void close()
           throws XPathException

Description copied from interface: Receiver

Notify the end of the event stream

Throws:

XPathException - if an error occurs

append

public void append(Item item,
                   Location locationId,
                   int copyNamespaces)
            throws XPathException

Description copied from class: SequenceReceiver

Append an arbitrary item (node, atomic value, or function) 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 ReceiverOptions.ALL_NAMESPACES, ReceiverOptions.LOCAL_NAMESPACES; the default (0) means no namespaces

Throws:

XPathException

usesTypeAnnotations

public boolean usesTypeAnnotations()

Description copied from interface: Receiver

Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events. The default implementation of this method returns false.

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)

isReadyForBulkCopy

public boolean isReadyForBulkCopy()

bulkCopyElementNode

public void bulkCopyElementNode(TinyElementImpl node,
                                int copyOptions)
                         throws XPathException

Throws:

XPathException

isReadyForGrafting

public boolean isReadyForGrafting()

graftElementNode

public void graftElementNode(TinyElementImpl node,
                             int copyOptions)
                      throws XPathException

Throws:

XPathException