net.sf.saxon.tree.wrapper
Class AbstractVirtualNode

java.lang.Object
  net.sf.saxon.tree.wrapper.AbstractVirtualNode

All Implemented Interfaces:

Source, PullEvent, Item<NodeInfo>, NodeInfo, ValueRepresentation<NodeInfo>, VirtualNode

Direct Known Subclasses:

SpaceStrippedNode, TypeStrippedNode

public abstract class AbstractVirtualNode
extends Object
implements VirtualNode

AbstractVirtualNode is an abstract superclass for VirtualNode implementations in which the underlying node is itself a Saxon NodeInfo.

Field Summary

protected AbstractVirtualNode	docWrapper
protected NodeInfo	node
protected AbstractVirtualNode	parent

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

ALL_NAMESPACES, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES

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

EMPTY_VALUE_ARRAY

Constructor Summary

AbstractVirtualNode()

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.
String	getAttributeValue(int fingerprint) Get the value of a given attribute of 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
NamespaceBinding[]	getDeclaredNamespaces(NamespaceBinding[] buffer) Get all namespace undeclarations and undeclarations defined on this element.
String	getDisplayName() Get the display name of this node.
long	getDocumentNumber() Get the document number of the document containing this node.
DocumentInfo	getDocumentRoot() Get the root (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 name pool for this node
int	getNodeKind() Return the type of node.
String	getPrefix() Get the prefix of the name of the node.
Object	getRealNode() Get the node underlying this virtual node.
NodeInfo	getRoot() Get the root node - always a document node with this tree implementation
SchemaType	getSchemaType() Get the type annotation
String	getStringValue() Return the string value of the 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
SequenceIterator	getTypedValue() Get the typed value of the item
NodeInfo	getUnderlyingNode() Get the underlying node, to implement the VirtualNode interface
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	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.
AxisIterator	iterateAxis(byte axisNumber, NodeTest nodeTest) Return an iteration over the nodes reached by the given axis from this node
void	setSystemId(String uri)

Methods inherited from class java.lang.Object

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

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

copy, getParent, iterateAxis

Field Detail

node

protected NodeInfo node

parent

protected AbstractVirtualNode parent

docWrapper

protected AbstractVirtualNode docWrapper

Constructor Detail

AbstractVirtualNode

public AbstractVirtualNode()

Method Detail

getUnderlyingNode

public NodeInfo getUnderlyingNode()

Get the underlying node, to implement the VirtualNode interface

Specified by:

getUnderlyingNode in interface VirtualNode

Returns:

The underlying node.

getRealNode

public Object getRealNode()

Get the node underlying this virtual node. If this is a VirtualNode the method will automatically drill down through several layers of wrapping.

Specified by:

getRealNode in interface VirtualNode

Returns:

The underlying node.

getConfiguration

public Configuration getConfiguration()

Get the configuration

Specified by:

getConfiguration in interface NodeInfo

Returns:

the Configuration

getNamePool

public NamePool getNamePool()

Get the name pool for this node

Specified by:

getNamePool in interface NodeInfo

Returns:

the NamePool

getNodeKind

public int getNodeKind()

Return the type of node.

Specified by:

getNodeKind in interface NodeInfo

Returns:

one of the values Node.ELEMENT, Node.TEXT, Node.ATTRIBUTE, etc.

See Also:

Type

getTypedValue

public SequenceIterator getTypedValue()
                               throws XPathException

Get the typed value of the item

Specified by:

getTypedValue in interface Item<NodeInfo>

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

Since:

8.5

getTypeAnnotation

public int getTypeAnnotation()

Get the type annotation

Specified by:

getTypeAnnotation in interface NodeInfo

Returns:

the type annotation of the base node

getSchemaType

public SchemaType getSchemaType()

Get the type annotation

Specified by:

getSchemaType in interface NodeInfo

Returns:

the type annotation of the base node

isSameNodeInfo

public boolean isSameNodeInfo(NodeInfo other)

Determine whether this is the same node as another node.
Note: a.isSameNode(b) if and only if generateId(a)==generateId(b)

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.

getSystemId

public String getSystemId()

Get the System ID for the node.

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. Note this is not the same as the base URI: the base URI can be modified by xml:base, but the system ID cannot.

setSystemId

public void setSystemId(String uri)

Specified by:

setSystemId in interface Source

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. In the JDOM model, base URIs are held only an the document level. We don't currently take any account of xml:base attributes.

Specified by:

getBaseURI in interface NodeInfo

Returns:

the base URI of the node. This may be null if the base URI is unknown, including the case where the node has no parent.

getLineNumber

public int getLineNumber()

Get 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

getColumnNumber

public int getColumnNumber()

Get 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

compareOrder

public 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())

getStringValue

public final String getStringValue()

Return the string value of the node. 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.

Specified by:

getStringValue in interface Item<NodeInfo>

Specified by:

getStringValue in interface NodeInfo

Specified by:

getStringValue in interface ValueRepresentation<NodeInfo>

Returns:

the string value of the node

See Also:

Item.getStringValueCS()

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<NodeInfo>

Specified by:

getStringValueCS in interface ValueRepresentation<NodeInfo>

Returns:

the string value of the item

See Also:

Item.getStringValue()

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 &0xfffff, 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.

See Also:

allocate

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. A fingerprint of -1 should be returned 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.

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 null, except for un unnamed namespace node, which returns "".

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, return null. For a node with an empty prefix, return an empty string.

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, return a zero-length string.

Specified by:

getPrefix in interface NodeInfo

Returns:

The prefix of the name of the node.

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.

iterateAxis

public AxisIterator iterateAxis(byte axisNumber,
                                NodeTest nodeTest)

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

Specified by:

iterateAxis in interface NodeInfo

Parameters:

axisNumber - the axis to be used

nodeTest - A pattern to be matched by the returned nodes

Returns:

a SequenceIterator 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

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 - always a document node with this tree implementation

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

hasChildNodes

public boolean hasChildNodes()

Determine whether the node has any children.
Note: the result is equivalent to
getEnumeration(Axis.CHILD, AnyNodeTest.getInstance()).hasNext()

Specified by:

hasChildNodes in interface NodeInfo

Returns:

True if the node has one or more children

generateId

public void generateId(FastStringBuffer buffer)

Get 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, into which will be placed a string that uniquely identifies this node, within this document. The calling code prepends information to make the result unique across all documents.

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

getDeclaredNamespaces

public NamespaceBinding[] getDeclaredNamespaces(NamespaceBinding[] 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.

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