net.sf.saxon.tree
Class NodeImpl

java.lang.Object
  net.sf.saxon.tree.NodeImpl

All Implemented Interfaces:

Source, SourceLocator, PullEvent, FingerprintedNode, Item, NodeInfo, ValueRepresentation

Direct Known Subclasses:

DocumentImpl, ElementImpl

public abstract class NodeImpl
extends Object
implements NodeInfo, FingerprintedNode, SourceLocator

A node in the XML parse tree representing an XML element, character content, or attribute.

This is the top-level class in the implementation class hierarchy; it essentially contains all those methods that can be defined using other primitive methods, without direct access to data.

Author:

Michael H. Kay

Field Summary

static char[]

NODE_LETTER Chararacteristic letters to identify each type of node, indexed using the node type values.

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

ALL_NAMESPACES, EMPTY_NAMESPACE_LIST, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES

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

EMPTY_VALUE_ARRAY

Constructor Summary

NodeImpl()

Method Summary

Value	atomize() Get the typed value.
int	compareOrder(NodeInfo other) Determine the relative position of this node and another node, in document order.
boolean	equals(Object other) The equals() method compares nodes for identity.
void	generateId(FastStringBuffer buffer) Get a character string that uniquely identifies this node within this document (The calling code will prepend a document identifier)
String	getAttributeValue(int fingerprint) Get the value of a given attribute of this node
String	getBaseURI() Get the base URI for the node.
int	getColumnNumber() Get the column number of the node.
Configuration	getConfiguration() Get the configuration
int[]	getDeclaredNamespaces(int[] buffer) Get all namespace undeclarations and undeclarations defined on this element.
String	getDisplayName() Get the display name of this node.
int	getDocumentNumber() Get the document number of the document containing this node.
DocumentInfo	getDocumentRoot() Get the root (document) node
int	getFingerprint() Get the fingerprint of the node.
NodeInfo	getFirstChild() Get first child - default implementation used for leaf nodes
NodeInfo	getLastChild() Get last child - default implementation used for leaf nodes
int	getLineNumber() Get the line number of the node within its source document entity
String	getLocalPart() Get the local name of this node.
int	getNameCode() Get the nameCode of the node.
NamePool	getNamePool() Get the NamePool
NodeImpl	getNextInDocument(NodeImpl anchor) Get the next node in document order
NodeInfo	getNextSibling() Get next sibling node
NodeInfo	getParent() Find the parent node of this node.
String	getPrefix() Get the prefix part of the name of this node.
NodeImpl	getPreviousInDocument() Get the previous node in document order
NodeInfo	getPreviousSibling() Get the previous sibling of the node
String	getPublicId() Get the public identifier of the document entity containing this node.
NodeInfo	getRoot() Get the root node
CharSequence	getStringValueCS() Get the 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
SequenceIterator	getTypedValue() Get the typed value of this node.
String	getURI() Get the URI part of the name of this node.
boolean	hasChildNodes() Determine whether the node has any children.
int	hashCode() The hashCode() method obeys the contract for hashCode(): that is, if two objects are equal (represent the same node) then they must have the same hashCode()
boolean	isSameNodeInfo(NodeInfo other) Determine whether this is the same node as another node
AxisIterator	iterateAxis(byte axisNumber) Return an enumeration over the nodes reached by the given axis from this node
AxisIterator	iterateAxis(byte axisNumber, NodeTest nodeTest) Return an enumeration over the nodes reached by the given axis from this node
void	setSystemId(String uri) Set the system ID of this node.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

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

copy, getNodeKind, getStringValue

Field Detail

NODE_LETTER

public static final char[] NODE_LETTER

Chararacteristic letters to identify each type of node, indexed using the node type values. These are used as the initial letter of the result of generate-id()

Constructor Detail

NodeImpl

public NodeImpl()

Method Detail

getStringValueCS

public CharSequence getStringValueCS()

Get the value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String.

Specified by:

getStringValueCS in interface Item

Specified by:

getStringValueCS in interface ValueRepresentation

Returns:

the string value of the item

See Also:

Item.getStringValue()

getTypeAnnotation

public int getTypeAnnotation()

Get the type annotation of this node, if any

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).

The result is undefined for nodes other than elements and attributes.

getColumnNumber

public int getColumnNumber()

Get the column number of the node. The default implementation returns -1, meaning unknown

Specified by:

getColumnNumber in interface SourceLocator

getPublicId

public String getPublicId()

Get the public identifier of the document entity containing this node. The default implementation returns null, meaning unknown

Specified by:

getPublicId in interface SourceLocator

getDocumentNumber

public int 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

getTypedValue

public SequenceIterator getTypedValue()
                               throws XPathException

Get the typed value of this node. If there is no type annotation, we return the string value, as an instance of xs:untypedAtomic

Specified by:

getTypedValue in interface Item

Returns:

an iterator over the items in the typed value of the node or atomic value. The items returned by this iterator will always be atomic values.

Throws:

XPathException - where no typed value is available, for example in the case of an element with complex content

atomize

public Value atomize()
              throws XPathException

Get the typed value. The result of this method will always be consistent with the method Item.getTypedValue(). However, this method is often more convenient and may be more efficient, especially in the common case where the value is expected to be a singleton.

Specified by:

atomize in interface NodeInfo

Returns:

the typed value. If requireSingleton is set to true, the result will always be an AtomicValue. In other cases it may be a Value representing a sequence whose items are atomic values.

Throws:

XPathException

Since:

8.5

setSystemId

public void setSystemId(String uri)

Set the system ID of this node. This method is provided so that a NodeInfo implements the javax.xml.transform.Source interface, allowing a node to be used directly as the Source of a transformation

Specified by:

setSystemId in interface Source

isSameNodeInfo

public boolean isSameNodeInfo(NodeInfo other)

Determine whether this is the same node as another node

Specified by:

isSameNodeInfo in interface NodeInfo

Parameters:

other - the node to be compared with this node

Returns:

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

equals

public boolean equals(Object other)

The equals() method compares nodes for identity. It is defined to give the same result as isSameNodeInfo().

Specified by:

equals in interface NodeInfo

Overrides:

equals in class Object

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.

Since:

8.7 Previously, the effect of the equals() method was not defined. Callers should therefore be aware that third party implementations of the NodeInfo interface may not implement the correct semantics. It is safer to use isSameNodeInfo() for this reason. The equals() method has been defined because it is useful in contexts such as a Java Set or HashMap.

hashCode

public int hashCode()

The hashCode() method obeys the contract for hashCode(): that is, if two objects are equal (represent the same node) then they must have the same hashCode()

Specified by:

hashCode in interface NodeInfo

Overrides:

hashCode in class Object

Since:

8.7 Previously, the effect of the equals() and hashCode() methods was not defined. Callers should therefore be aware that third party implementations of the NodeInfo interface may not implement the correct semantics.

getNameCode

public int getNameCode()

Get the nameCode of the node. This is used to locate the name in the NamePool

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.

See Also:

allocate, getFingerprint

getFingerprint

public int getFingerprint()

Get the fingerprint of the node. This is used to compare whether two nodes have equivalent names. Return -1 for a node with no name.

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.

generateId

public void generateId(FastStringBuffer buffer)

Get a character string that uniquely identifies this node within this document (The calling code will prepend a document identifier)

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.

getSystemId

public String getSystemId()

Get the system ID for the node. Default implementation for child nodes.

Specified by:

getSystemId in interface Source

Specified by:

getSystemId in interface SourceLocator

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.

getBaseURI

public String getBaseURI()

Get the base URI for the node. Default implementation for child nodes.

Specified by:

getBaseURI in interface NodeInfo

Returns:

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

compareOrder

public final int compareOrder(NodeInfo other)

Determine the relative position of this node and another node, in document order. The other node will always be in the same document.

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())

getConfiguration

public Configuration getConfiguration()

Get the configuration

Specified by:

getConfiguration in interface NodeInfo

Returns:

the Configuration

getNamePool

public NamePool getNamePool()

Get the NamePool

Specified by:

getNamePool in interface NodeInfo

Returns:

the namepool

getPrefix

public String getPrefix()

Get the prefix part of the name of this node. This is the name before the ":" if any.

Specified by:

getPrefix in interface NodeInfo

Returns:

the prefix part of the name. For an unnamed node, return an empty string.

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 the default namespace, return an empty string. For an unnamed node, return the empty string.

getDisplayName

public String getDisplayName()

Get the display name of this node. 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, return an empty string.

getLocalPart

public String getLocalPart()

Get the local name of this node.

Specified by:

getLocalPart in interface NodeInfo

Returns:

The local name of this node. For a node with no name, return "",.

getLineNumber

public int getLineNumber()

Get the line number of the node within its source document entity

Specified by:

getLineNumber in interface SourceLocator

Specified by:

getLineNumber in interface NodeInfo

Returns:

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

getParent

public final NodeInfo getParent()

Find the parent node of this node.

Specified by:

getParent in interface NodeInfo

Returns:

The Node object describing the containing element or root node.

getPreviousSibling

public NodeInfo getPreviousSibling()

Get the previous sibling of the node

Returns:

The previous sibling node. Returns null if the current node is the first child of its parent.

getNextSibling

public NodeInfo getNextSibling()

Get next sibling node

Returns:

The next sibling node of the required type. Returns null if the current node is the last child of its parent.

getFirstChild

public NodeInfo getFirstChild()

Get first child - default implementation used for leaf nodes

Returns:

null

getLastChild

public NodeInfo getLastChild()

Get last child - default implementation used for leaf nodes

Returns:

null

iterateAxis

public AxisIterator iterateAxis(byte axisNumber)

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

Specified by:

iterateAxis in interface NodeInfo

Parameters:

axisNumber - The axis to be iterated over

Returns:

an AxisIterator that scans the nodes reached by the axis in turn.

See Also:

Axis

iterateAxis

public AxisIterator iterateAxis(byte axisNumber,
                                NodeTest nodeTest)

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

Specified by:

iterateAxis in interface NodeInfo

Parameters:

axisNumber - The axis to be iterated over

nodeTest - A pattern to be matched by the returned nodes

Returns:

an AxisIterator that scans the nodes reached by the axis in turn.

See Also:

Axis

getAttributeValue

public String getAttributeValue(int fingerprint)

Get the value of a given attribute of this node

Specified by:

getAttributeValue in interface NodeInfo

Parameters:

fingerprint - The fingerprint of the attribute name

Returns:

the attribute value if it exists or null if not

getRoot

public NodeInfo getRoot()

Get the root node

Specified by:

getRoot in interface NodeInfo

Returns:

the NodeInfo representing the containing document

getDocumentRoot

public DocumentInfo getDocumentRoot()

Get the root (document) node

Specified by:

getDocumentRoot in interface NodeInfo

Returns:

the DocumentInfo representing the containing document

getNextInDocument

public NodeImpl getNextInDocument(NodeImpl anchor)

Get the next node in document order

Parameters:

anchor - the scan stops when it reaches a node that is not a descendant of the specified anchor node

Returns:

the next node in the document, or null if there is no such node

getPreviousInDocument

public NodeImpl getPreviousInDocument()

Get the previous node in document order

Returns:

the previous node in the document, or null if there is no such node

getDeclaredNamespaces

public int[] getDeclaredNamespaces(int[] buffer)

Get all namespace undeclarations and undeclarations defined on this element.

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.

hasChildNodes

public boolean hasChildNodes()

Determine whether the node has any children.

Specified by:

hasChildNodes in interface NodeInfo

Returns:

true if the node has any children, false if the node has no children.