com.saxonica.stream.om

Class FleetingNode

java.lang.Object

com.saxonica.stream.om.FleetingNode

All Implemented Interfaces:

Source, PullEvent, Item, NodeInfo, Sequence

Direct Known Subclasses:

FleetingParentNode

public class FleetingNode
extends Object
implements NodeInfo

A FleetingNode is a node that exists transiently in the course of streaming processing. The node has a parent (unless it is the root), and the case of an element node it also has attributes and namespaces; but it has no descendants or following or preceding nodes.

Field Summary

Fields

Modifier and Type	Field and Description
protected FleetingDocumentNode	root

Fields inherited from interface net.sf.saxon.om.NodeInfo

ALL_NAMESPACES, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES

Constructor Summary

Constructors

Constructor and Description
FleetingNode()

Method Summary

Methods

Modifier and Type	Method and Description
AtomicSequence	atomize() Get the typed value.
int	compareOrder(NodeInfo other) Determine the relative position of this node and another node, in document order.
int	comparePosition(NodeInfo other) Determine the relative position of this node and another node, in document order, distinguishing whether the first node is a preceding, following, descendant, ancestor, or the same node as the second.
void	copy(Receiver out, int copyOptions, int locationId) Copy this node to a given Receiver.
void	generateId(FastStringBuffer buffer) Construct a character string that uniquely identifies this node.
String	getAttributeValue(String uri, String local) Get the string value of a given attribute of this node
String	getBaseURI() Get the Base URI for the node, that is, the URI used for resolving a relative URI contained in the node.
int	getColumnNumber() Get column number.
Configuration	getConfiguration() Get the configuration used to build the tree containing this node.
NamespaceBinding[]	getDeclaredNamespaces(NamespaceBinding[] buffer) Get all namespace declarations and undeclarations defined on this element.
String	getDisplayName() Get the display name of this node, in the form of a lexical QName.
long	getDocumentNumber() Get the document number of the document containing this node.
DocumentInfo	getDocumentRoot() Get the root node, if it is a document node.
int	getFingerprint() Get fingerprint.
int	getLineNumber() Get line number.
String	getLocalPart() Get the local part of the name of this node.
int	getNameCode() Get name code.
NamePool	getNamePool() Get the NamePool that holds the namecode for this node
int	getNodeKind() Get the kind of node.
NodeInfo	getParent() Get the NodeInfo object representing the parent of this node
String	getPrefix() Get the prefix of the name of the node.
NodeInfo	getRoot() Get the root node of the tree containing this node
SchemaType	getSchemaType() Get the type annotation of this node, if any.
String	getStringValue() Return the string value of the node as defined in the XPath data model.
CharSequence	getStringValueCS() Get the string value of the item as a CharSequence.
String	getSystemId() Get the System ID for the node.
int	getTypeAnnotation() Get the type annotation of this node, if any.
String	getURI() Get the URI part of the name of this node.
boolean	hasChildNodes() Determine whether the node has any children.
Item	head() To implement Sequence, this method returns the item itself
boolean	isId() Determine whether this node has the is-id property
boolean	isIdref() Determine whether this node has the is-idref property
boolean	isNilled() Determine whether the node has the is-nilled property
boolean	isSameNodeInfo(NodeInfo other) Determine whether this is the same node as another node.
SequenceIterator	iterate() To implement Sequence, this method returns a singleton iterator that delivers this item in the form of a sequence
AxisIterator	iterateAxis(byte axisNumber) Return an iteration over all the nodes reached by the given axis from this node
AxisIterator	iterateAxis(byte axisNumber, NodeTest nodeTest) Return an iteration over all the nodes reached by the given axis from this node that match a given NodeTest
void	setNodeKind(int nodeKind)
void	setNodeName(NodeName name)
void	setParent(FleetingNode parent)
void	setStringValue(CharSequence stringValue)
void	setSystemId(String systemId) Set the system identifier for this Source.
void	setTypeAnnotation(SchemaType typeAnnotation)

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.om.NodeInfo

equals, hashCode

Field Detail

root

protected FleetingDocumentNode root

Constructor Detail

FleetingNode

public FleetingNode()

Method Detail

head

public Item head()

To implement Sequence, this method returns the item itself

Specified by:

head in interface Sequence

Returns:

this item

iterate

public SequenceIterator iterate()

To implement Sequence, this method returns a singleton iterator that delivers this item in the form of a sequence

Specified by:

iterate in interface Sequence

Returns:

a singleton iterator that returns this item

setParent

public void setParent(FleetingNode parent)

setNodeName

public void setNodeName(NodeName name)

setNodeKind

public void setNodeKind(int nodeKind)

setStringValue

public void setStringValue(CharSequence stringValue)

setTypeAnnotation

public void setTypeAnnotation(SchemaType typeAnnotation)

getNodeKind

public int getNodeKind()

Get the kind of node. This will be a value such as Type.ELEMENT or Type.ATTRIBUTE. There are seven kinds of node: documents, elements, attributes, text, comments, processing-instructions, and namespaces.

Specified by:

getNodeKind in interface NodeInfo

Returns:

an integer identifying the kind of node. These integer values are the same as those used in the DOM

Since:

8.4

See Also:

Type

isSameNodeInfo

public boolean isSameNodeInfo(NodeInfo other)

Determine whether this is the same node as another node.

Note that two different NodeInfo instances can represent the same conceptual node. Therefore the "==" operator should not be used to test node identity. The equals() method should give the same result as isSameNodeInfo(), but since this rule was introduced late it might not apply to all implementations.

Note: a.isSameNodeInfo(b) if and only if generateId(a)==generateId(b).

This method has the same semantics as isSameNode() in DOM Level 3, but works on Saxon NodeInfo objects rather than DOM Node objects.

Specified by:

isSameNodeInfo in interface NodeInfo

Parameters:

other - the node to be compared with this node

Returns:

true if this NodeInfo object and the supplied NodeInfo object represent the same node in the tree.

getSystemId

public String getSystemId()

Get the System ID for the node. Note this is not the same as the base URI: the base URI can be modified by xml:base, but the system ID cannot. The base URI is used primarily for resolving relative URIs within the content of the document. The system ID is used primarily in conjunction with a line number, for identifying the location of elements within the source XML, in particular when errors are found. For a document node, the System ID represents the value of the document-uri property as defined in the XDM data model.

Specified by:

getSystemId in interface Source

Specified by:

getSystemId in interface NodeInfo

Returns:

the System Identifier of the entity in the source document containing the node, or null if not known or not applicable.

Since:

8.4

getBaseURI

public String getBaseURI()

Get the Base URI for the node, that is, the URI used for resolving a relative URI contained in the node. This will be the same as the System ID unless xml:base has been used. Where the node does not have a base URI of its own, the base URI of its parent node is returned.

Specified by:

getBaseURI in interface NodeInfo

Returns:

the base URI of the node. This may be null if the base URI is unknown.

Since:

8.4

getLineNumber

public int getLineNumber()

Get line number. Line numbers are not maintained by default, except for stylesheets and schema documents. Line numbering can be requested using the -l option on the command line, or by setting options on the TransformerFactory or the Configuration before the source document is built.

The granularity of line numbering is normally the element level: for other nodes such as text nodes and attributes, the line number of the parent element will normally be returned.

In the case of a tree constructed by taking input from a SAX parser, the line number will reflect the SAX rules: that is, the line number of an element is the line number where the start tag ends. This may be a little confusing where elements have many attributes spread over multiple lines, or where single attributes (as can easily happen with XSLT 2.0 stylesheets) occupy several lines.

In the case of a tree constructed by a stylesheet or query, the line number may reflect the line in the stylesheet or query that caused the node to be constructed.

The line number can be read from within an XPath expression using the Saxon extension function saxon:line-number()

Specified by:

getLineNumber in interface NodeInfo

Returns:

the line number of the node in its original source document; or -1 if not available

Since:

8.4

getColumnNumber

public int getColumnNumber()

Get column number. Column numbers are not maintained by default. Column numbering can be requested in the same way as line numbering; but a tree implementation can ignore the request.

The granularity of column numbering is normally the element level: for other nodes such as text nodes and attributes, the line number of the parent element will normally be returned.

In the case of a tree constructed by taking input from a SAX parser, the column number will reflect the SAX rules: that is, the column number of an element is the column number where the start tag ends. This may be a little confusing where elements have many attributes spread over multiple lines, or where single attributes (as can easily happen with XSLT 2.0 stylesheets) occupy several lines.

In the case of a tree constructed by a stylesheet or query, the column number may reflect the line in the stylesheet or query that caused the node to be constructed.

The column number can be read from within an XPath expression using the Saxon extension function saxon:column-number()

Specified by:

getColumnNumber in interface NodeInfo

Returns:

the column number of the node in its original source document; or -1 if not available

Since:

9.1

compareOrder

public int compareOrder(NodeInfo other)

Determine the relative position of this node and another node, in document order.

The other node must always be in the same tree; the effect of calling this method when the two nodes are in different trees is undefined. To obtain a global ordering of nodes, the application should first compare the result of getDocumentNumber(), and only if the document number is the same should compareOrder() be called.

Specified by:

compareOrder in interface NodeInfo

Parameters:

other - The other node, whose position is to be compared with this node

Returns:

-1 if this node precedes the other node, +1 if it follows the other node, or 0 if they are the same node. (In this case, isSameNode() will always return true, and the two nodes will produce the same result for generateId())

Since:

8.4

comparePosition

public int comparePosition(NodeInfo other)

Determine the relative position of this node and another node, in document order, distinguishing whether the first node is a preceding, following, descendant, ancestor, or the same node as the second.

The other node must always be in the same tree; the effect of calling this method when the two nodes are in different trees is undefined. If either node is a namespace or attribute node, the method should throw UnsupportedOperationException.

Specified by:

comparePosition in interface NodeInfo

Parameters:

other - The other node, whose position is to be compared with this node

Returns:

AxisInfo.PRECEDING if this node is on the preceding axis of the other node; AxisInfo.FOLLOWING if it is on the following axis; AxisInfo.ANCESTOR if the first node is an ancestor of the second; AxisInfo.DESCENDANT if the first is a descendant of the second; AxisInfo.SELF if they are the same node.

Throws:

UnsupportedOperationException - if either node is an attribute or namespace

Since:

9.5

getStringValue

public String getStringValue()

Return the string value of the node as defined in the XPath data model.

The interpretation of this depends on the type of node. For an element it is the accumulated character content of the element, including descendant elements.

This method returns the string value as if the node were untyped. Unlike the string value accessor in the XPath 2.0 data model, it does not report an error if the element has a complex type, instead it returns the concatenation of the descendant text nodes as it would if the element were untyped.

Specified by:

getStringValue in interface Item

Specified by:

getStringValue in interface NodeInfo

Returns:

the string value of the node

Since:

8.4

See Also:

Item.getStringValueCS()

getNameCode

public int getNameCode()

Get name code. The name code is a coded form of the node name: two nodes with the same name code have the same namespace URI, the same local name, and the same prefix. By masking the name code with NamePool.FP_MASK, you get a fingerprint: two nodes with the same fingerprint have the same local name and namespace URI.

Specified by:

getNameCode in interface NodeInfo

Returns:

an integer name code, which may be used to obtain the actual node name from the name pool. For unnamed nodes (text nodes, comments, document nodes, and namespace nodes for the default namespace), returns -1.

Since:

8.4

See Also:

allocate, getFingerprint

getFingerprint

public int getFingerprint()

Get fingerprint. The fingerprint is a coded form of the expanded name of the node: two nodes with the same name code have the same namespace URI and the same local name. The fingerprint contains no information about the namespace prefix. For a name in the null namespace, the fingerprint is the same as the name code.

Specified by:

getFingerprint in interface NodeInfo

Returns:

an integer fingerprint; two nodes with the same fingerprint have the same expanded QName. For unnamed nodes (text nodes, comments, document nodes, and namespace nodes for the default namespace), returns -1.

Since:

8.4

getLocalPart

public String getLocalPart()

Get the local part of the name of this node. This is the name after the ":" if any.

Specified by:

getLocalPart in interface NodeInfo

Returns:

the local part of the name. For an unnamed node, returns "". Unlike the DOM interface, this returns the full name in the case of a non-namespaced name.

Since:

8.4

getURI

public String getURI()

Get the URI part of the name of this node. This is the URI corresponding to the prefix, or the URI of the default namespace if appropriate.

Specified by:

getURI in interface NodeInfo

Returns:

The URI of the namespace of this node. For an unnamed node, or for an element or attribute that is not in a namespace, or for a processing instruction, returns an empty string.

Since:

8.4

getDisplayName

public String getDisplayName()

Get the display name of this node, in the form of a lexical QName. For elements and attributes this is [prefix:]localname. For unnamed nodes, it is an empty string.

Specified by:

getDisplayName in interface NodeInfo

Returns:

The display name of this node. For a node with no name, returns an empty string.

Since:

8.4

getPrefix

public String getPrefix()

Get the prefix of the name of the node. This is defined only for elements and attributes. If the node has no prefix, or for other kinds of node, returns a zero-length string.

Specified by:

getPrefix in interface NodeInfo

Returns:

The prefix of the name of the node.

Since:

8.4

getConfiguration

public Configuration getConfiguration()

Get the configuration used to build the tree containing this node.

Specified by:

getConfiguration in interface NodeInfo

Returns:

the Configuration

Since:

8.4

getNamePool

public NamePool getNamePool()

Get the NamePool that holds the namecode for this node

Specified by:

getNamePool in interface NodeInfo

Returns:

the namepool

Since:

8.4

getTypeAnnotation

public int getTypeAnnotation()

Get the type annotation of this node, if any. The type annotation is represented as an integer; this is the fingerprint of the name of the type, as defined in the name pool. Anonymous types are given a system-defined name. The value of the type annotation can be used to retrieve the actual schema type definition using the method Configuration.getSchemaType(int).

The bit IS_DTD_TYPE (1<<30) will be set in the case of an attribute node if the type annotation is one of ID, IDREF, or IDREFS and this is derived from DTD rather than schema validation.

Specified by:

getTypeAnnotation in interface NodeInfo

Returns:

the type annotation of the node, under the mask NamePool.FP_MASK, and optionally the bit setting IS_DTD_TYPE in the case of a DTD-derived ID or IDREF/S type (which is treated as untypedAtomic for the purposes of obtaining the typed value).

For elements and attributes, this is the type annotation as defined in XDM. For document nodes, it should be one of XS_UNTYPED if the document has not been validated, or XS_ANY_TYPE if validation has taken place (that is, if any node in the document has an annotation other than Untyped or UntypedAtomic).

getSchemaType

public SchemaType getSchemaType()

Get the type annotation of this node, if any. The type annotation is represented as SchemaType object.

Types derived from a DTD are not reflected in the result of this method.

Specified by:

getSchemaType in interface NodeInfo

Returns:

For element and attribute nodes: the type annotation derived from schema validation (defaulting to xs:untyped and xs:untypedAtomic in the absence of schema validation). For comments, text nodes, processing instructions, and namespaces: null. For document nodes, either xs:untyped if the document has not been validated, or xs:anyType if it has.

Since:

9.4

atomize

public AtomicSequence atomize()
                       throws XPathException

Get the typed value.

Specified by:

atomize in interface NodeInfo

Returns:

the typed value. This will either be a single AtomicValue or a Value whose items are atomic values.

Throws:

XPathException - if the node has no typed value, for example if it is an element node with element-only content

getParent

public NodeInfo getParent()

Get the NodeInfo object representing the parent of this node

Specified by:

getParent in interface NodeInfo

Returns:

the parent of this node; null if this node has no parent

iterateAxis

public AxisIterator iterateAxis(byte axisNumber)

Return an iteration over all the nodes reached by the given axis from this node

Specified by:

iterateAxis in interface NodeInfo

Parameters:

axisNumber - an integer identifying the axis; one of the constants defined in class AxisInfo

Returns:

an AxisIterator that delivers the nodes reached by the axis in turn. The nodes are returned in axis order (document order for a forwards axis, reverse document order for a reverse axis).

Throws:

UnsupportedOperationException - if the namespace axis is requested and this axis is not supported for this implementation.

See Also:

AxisInfo

iterateAxis

public AxisIterator iterateAxis(byte axisNumber,
                       NodeTest nodeTest)

Return an iteration over all the nodes reached by the given axis from this node that match a given NodeTest

Specified by:

iterateAxis in interface NodeInfo

Parameters:

axisNumber - an integer identifying the axis; one of the constants defined in class AxisInfo

nodeTest - A condition to be satisfied by the returned nodes; nodes that do not satisfy this condition are not included in the result

Returns:

an AxisIterator that delivers the nodes reached by the axis in turn. The nodes are returned in axis order (document order for a forwards axis, reverse document order for a reverse axis).

Throws:

UnsupportedOperationException - if the namespace axis is requested and this axis is not supported for this implementation.

See Also:

AxisInfo

getAttributeValue

public String getAttributeValue(String uri,
                       String local)

Get the string value of a given attribute of this node

Specified by:

getAttributeValue in interface NodeInfo

Parameters:

uri - the namespace URI of the attribute name. Supply the empty string for an attribute that is in no namespace

local - the local part of the attribute name.

Returns:

the attribute value if it exists, or null if it does not exist. Always returns null if this node is not an element.

Since:

9.4

getRoot

public NodeInfo getRoot()

Get the root node of the tree containing this node

Specified by:

getRoot in interface NodeInfo

Returns:

the NodeInfo representing the top-level ancestor of this node. This will not necessarily be a document node. If this node has no parent, then the method returns this node.

Since:

8.4

getDocumentRoot

public DocumentInfo getDocumentRoot()

Get the root node, if it is a document node.

Specified by:

getDocumentRoot in interface NodeInfo

Returns:

the DocumentInfo representing the containing document. If this node is part of a tree that does not have a document node as its root, returns null.

Since:

8.4

hasChildNodes

public boolean hasChildNodes()

Determine whether the node has any children.

Note: the result is equivalent to
iterateAxis(Axis.CHILD).next() != null

Specified by:

hasChildNodes in interface NodeInfo

Returns:

True if the node has one or more children

Since:

8.4

generateId

public void generateId(FastStringBuffer buffer)

Construct a character string that uniquely identifies this node. Note: a.isSameNode(b) if and only if generateId(a)==generateId(b)

Specified by:

generateId in interface NodeInfo

Parameters:

buffer - a buffer which will be updated to hold a string that uniquely identifies this node, across all documents.

Since:

8.7

Changed in Saxon 8.7 to generate the ID value in a client-supplied buffer

getDocumentNumber

public long getDocumentNumber()

Get the document number of the document containing this node. For a free-standing orphan node, just return the hashcode.

Specified by:

getDocumentNumber in interface NodeInfo

Returns:

the document number of the document containing this node

Since:

8.4

copy

public void copy(Receiver out,
        int copyOptions,
        int locationId)
          throws XPathException

Copy this node to a given Receiver.

This method is primarily for internal use. It should not be considered a stable part of the Saxon API.

Specified by:

copy in interface NodeInfo

Parameters:

out - the Receiver to which the node should be copied. It is the caller's responsibility to ensure that this Receiver is open before the method is called (or that it is self-opening), and that it is closed after use.

copyOptions - a selection of the options defined in CopyOptions

locationId - If non-zero, identifies the location of the instruction that requested this copy. If zero, indicates that the location information for the original node is to be copied; in this case the Receiver must be

Throws:

XPathException - if any downstream error occurs

getDeclaredNamespaces

public NamespaceBinding[] getDeclaredNamespaces(NamespaceBinding[] buffer)

Get all namespace declarations and undeclarations defined on this element.

This method is intended primarily for internal use. User applications needing information about the namespace context of a node should use iterateAxis(Axis.NAMESPACE). (However, not all implementations support the namespace axis, whereas all implementations are required to support this method.)

Specified by:

getDeclaredNamespaces in interface NodeInfo

Parameters:

buffer - If this is non-null, and the result array fits in this buffer, then the result may overwrite the contents of this array, to avoid the cost of allocating a new array on the heap.

Returns:

An array of integers representing the namespace declarations and undeclarations present on this element. For a node other than an element, return null. Otherwise, the returned array is a sequence of namespace codes, whose meaning may be interpreted by reference to the name pool. The top half word of each namespace code represents the prefix, the bottom half represents the URI. If the bottom half is zero, then this is a namespace undeclaration rather than a declaration. The XML namespace is never included in the list. If the supplied array is larger than required, then the first unused entry will be set to -1.

For a node other than an element, the method returns null.

isId

public boolean isId()

Determine whether this node has the is-id property

Specified by:

isId in interface NodeInfo

Returns:

true if the node is an ID

isIdref

public boolean isIdref()

Determine whether this node has the is-idref property

Specified by:

isIdref in interface NodeInfo

Returns:

true if the node is an IDREF or IDREFS element or attribute

isNilled

public boolean isNilled()

Determine whether the node has the is-nilled property

Specified by:

isNilled in interface NodeInfo

Returns:

true if the node has the is-nilled property

setSystemId

public void setSystemId(String systemId)

Set the system identifier for this Source.

The system identifier is optional if the source does not get its data from a URL, but it may still be useful to provide one. The application can use a system identifier, for example, to resolve relative URIs and to include in error messages and warnings.

Specified by:

setSystemId in interface Source

Parameters:

systemId - The system identifier as a URL string.

getStringValueCS

public CharSequence getStringValueCS()

Get the string value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String. The method satisfies the rule that X.getStringValueCS().toString() returns a string that is equal to X.getStringValue().

Note that two CharSequence values of different types should not be compared using equals(), and for the same reason they should not be used as a key in a hash table.

If the calling code can handle any CharSequence, this method should be used. If the caller requires a string, the getStringValue() method is preferred.

Specified by:

getStringValueCS in interface Item

Returns:

the string value of the item

Since:

8.4

See Also:

getStringValue()