Package net.sf.saxon.event
Class TreeReceiver
java.lang.Object
net.sf.saxon.event.SequenceReceiver
net.sf.saxon.event.TreeReceiver
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.
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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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
Append an arbitrary item (node or atomic value) to the outputvoid
attribute
(NodeName nameCode, SimpleType typeCode, CharSequence value, int locationId, int properties) Notify an attribute.void
characters
(CharSequence chars, int locationId, int properties) Character datavoid
close()
End of event sequencevoid
comment
(CharSequence chars, int locationId, int properties) Output a commentvoid
Notify the end of a document nodevoid
End of elementGet the underlying Receiver (that is, the next one in the pipeline)void
namespace
(NamespaceBinding namespaceBinding, int properties) Notify a namespace.void
open()
Start of event sequencevoid
processingInstruction
(String target, CharSequence data, int locationId, int properties) Processing Instructionvoid
Set the pipeline configurationvoid
setSystemId
(String systemId) Set the system IDvoid
setUnparsedEntity
(String name, String uri, String publicId) Set the URI for an unparsed entity in the document.void
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 elementboolean
Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute eventsMethods inherited from class net.sf.saxon.event.SequenceReceiver
append, getConfiguration, getNamePool, getPipelineConfiguration, getSystemId
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Constructor Details
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TreeReceiver
Create a TreeReceiver- Parameters:
nextInChain
- the receiver to which events will be directed, after expanding append events into more primitive tree-based events
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Method Details
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setSystemId
Description copied from class:SequenceReceiver
Set the system ID- Specified by:
setSystemId
in interfaceReceiver
- Specified by:
setSystemId
in interfaceResult
- Overrides:
setSystemId
in classSequenceReceiver
- Parameters:
systemId
- the URI used to identify the tree being passed across this interface
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setPipelineConfiguration
Description copied from interface:Receiver
Set the pipeline configuration- Specified by:
setPipelineConfiguration
in interfaceReceiver
- Overrides:
setPipelineConfiguration
in classSequenceReceiver
- Parameters:
pipe
- the pipeline configuration
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getUnderlyingReceiver
Get the underlying Receiver (that is, the next one in the pipeline)- Returns:
- the underlying Receiver
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open
Start of event sequence- Specified by:
open
in interfaceReceiver
- Overrides:
open
in classSequenceReceiver
- Throws:
XPathException
- if an error occurs
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close
End of event sequence- Throws:
XPathException
- if an error occurs
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startDocument
Start of a document node.- Parameters:
properties
- bit-significant integer indicating properties of the document node. The definitions of the bits are in classReceiverOptions
- Throws:
XPathException
- if an error occurs
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endDocument
Notify the end of a document node- Throws:
XPathException
- if an error occurs
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startElement
public void startElement(NodeName nameCode, SchemaType typeCode, int locationId, int properties) throws XPathException Notify the start of an element- 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
- bit-significant properties of the element nodelocationId
- an integer which can be interpreted using aLocationProvider
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
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namespace
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.- Parameters:
namespaceBinding
- the prefix/uri pairproperties
- 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
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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.- Parameters:
nameCode
- The name of the attribute, as held in the name pooltypeCode
- The type of the attribute, as held in the name poolproperties
- 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 attributelocationId
- an integer which can be interpreted using aLocationProvider
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
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startContent
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
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endElement
End of element- Throws:
XPathException
- if an error occurs
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characters
Character data- Parameters:
chars
- The characterslocationId
- an integer which can be interpreted using aLocationProvider
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
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processingInstruction
public void processingInstruction(String target, CharSequence data, int 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 instructionlocationId
- an integer which can be interpreted using aLocationProvider
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
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comment
Output a comment- Parameters:
chars
- The content of the commentlocationId
- an integer which can be interpreted using aLocationProvider
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
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setUnparsedEntity
Set the URI for an unparsed entity in the document.- Specified by:
setUnparsedEntity
in interfaceReceiver
- Overrides:
setUnparsedEntity
in classSequenceReceiver
- Parameters:
name
- The name of the unparsed entityuri
- The system identifier of the unparsed entitypublicId
- The public identifier of the unparsed entity- Throws:
XPathException
- if an error occurs
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append
Append an arbitrary item (node or atomic value) to the output- Specified by:
append
in classSequenceReceiver
- Parameters:
item
- the item to be appendedlocationId
- the location of the calling instruction, for diagnosticscopyNamespaces
- if the item is an element node, this indicates whether its namespaces need to be copied. Values areNodeInfo.ALL_NAMESPACES
,NodeInfo.LOCAL_NAMESPACES
,NodeInfo.NO_NAMESPACES
- Throws:
XPathException
- if the operation fails
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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
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