net.sf.saxon.dom4j
Class NodeWrapper

java.lang.Object
  extended by net.sf.saxon.dom4j.NodeWrapper
All Implemented Interfaces:
Source, PullEvent, Item, NodeInfo, SiblingCountingNode, ValueRepresentation, VirtualNode
Direct Known Subclasses:
DocumentWrapper

public class NodeWrapper
extends Object
implements NodeInfo, VirtualNode, SiblingCountingNode

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

This is the implementation of the NodeInfo interface used as a wrapper for DOM4J nodes.

Author:
Michael H. Kay

Field Summary
 
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.NodeInfo
ALL_NAMESPACES, EMPTY_NAMESPACE_LIST, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES
 
Fields inherited from interface net.sf.saxon.om.NodeInfo
ALL_NAMESPACES, EMPTY_NAMESPACE_LIST, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES
 
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.
 void copy(Receiver out, int whichNamespaces, boolean copyAnnotations, int locationId)
          Copy this node to a given outputter (deep copy)
 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 getBaseURI()
          Get the Base URI for the node, that is, the URI used for resolving a relative URI contained in the node.
 Configuration getConfiguration()
          Get the configuration used to build the tree containing this node.
 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 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.
 NodeInfo getParent()
          Get the NodeInfo object representing the parent of this node
 String getPrefix()
          Get the prefix part of the name of this node.
 NodeInfo getRoot()
          Get the root node - always a document node with this tree implementation
 int getSiblingPosition()
          Get the index position of this node among its siblings (starting from 0)
 String getStringValue()
          Return the string value of the node.
 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
 SequenceIterator getTypedValue()
          Get the typed value of the item
 Object getUnderlyingNode()
          Get the underlying DOM 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.
 boolean isSameNode(NodeInfo other)
          Determine whether this is the same node as another node.
 boolean isSameNodeInfo(NodeInfo other)
          Determine whether this is the same node as another node.
 AxisIterator iterateAxis(byte axisNumber)
          Return an iteration over the nodes reached by the given axis from this node
 AxisIterator iterateAxis(byte axisNumber, NodeTest nodeTest)
          Return an iteration over the nodes reached by the given axis from this node
 void outputNamespaceNodes(Receiver out, boolean includeAncestors)
          Output all namespace nodes associated with this element.
 void setSystemId(String uri)
           
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface net.sf.saxon.om.NodeInfo
equals, hashCode
 
Methods inherited from interface net.sf.saxon.om.NodeInfo
equals, hashCode
 
Methods inherited from interface net.sf.saxon.om.NodeInfo
equals, hashCode
 

Method Detail

getUnderlyingNode

public Object getUnderlyingNode()
Get the underlying DOM node, to implement the VirtualNode interface

Specified by:
getUnderlyingNode in interface VirtualNode
Returns:
The underlying node.

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()
Get the typed value of the item

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.

atomize

public Value atomize()
Description copied from interface: NodeInfo
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. This will either be a single AtomicValue or a Value whose items are atomic values.

getTypeAnnotation

public int getTypeAnnotation()
Get the type annotation

Specified by:
getTypeAnnotation in interface NodeInfo
Returns:
UNTYPED or UNTYPED_ATOMIC

isSameNode

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

Parameters:
other - the node to be compared with
Returns:
true if this Node object and the supplied Node object represent the same node in the tree.

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 DOM4J 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.

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

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 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
Specified by:
getStringValue in interface NodeInfo
Specified by:
getStringValue in interface ValueRepresentation
Returns:
the string value of the node
See Also:
Item.getStringValueCS()

getStringValueCS

public CharSequence getStringValueCS()
Description copied from interface: Item
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 Item.getStringValue() method is preferred.

Specified by:
getStringValueCS in interface Item
Specified by:
getStringValueCS in interface ValueRepresentation
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 "".

getPrefix

public String getPrefix()
Get the prefix part of the name of this node. This is the name before the ":" if any. (Note, this method isn't required as part of the NodeInfo interface.)

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

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

getSiblingPosition

public int getSiblingPosition()
Get the index position of this node among its siblings (starting from 0)

Specified by:
getSiblingPosition in interface SiblingCountingNode
Returns:
0 for the first child, 1 for the second child, etc.

iterateAxis

public AxisIterator iterateAxis(byte axisNumber)
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
Returns:
a SequenceIterator that scans the nodes reached by the axis in turn.
See Also:
Axis

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

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 to contain a string that uniquely identifies this node, across all documents

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

copy

public void copy(Receiver out,
                 int whichNamespaces,
                 boolean copyAnnotations,
                 int locationId)
          throws XPathException
Copy this node to a given outputter (deep copy)

Specified by:
copy in interface NodeInfo
Parameters:
out - the Receiver to which the node should be copied
whichNamespaces - in the case of an element, controls which namespace nodes should be copied. Values are NodeInfo.NO_NAMESPACES, NodeInfo.LOCAL_NAMESPACES, NodeInfo.ALL_NAMESPACES
copyAnnotations - indicates whether the type annotations of element and attribute nodes should be copied
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 a LocationCopier
Throws:
XPathException

outputNamespaceNodes

public void outputNamespaceNodes(Receiver out,
                                 boolean includeAncestors)
                          throws XPathException
Output all namespace nodes associated with this element. Does nothing if the node is not an element.

Parameters:
out - The relevant outputter
includeAncestors - True if namespaces declared on ancestor elements must be output; false if it is known that these are already on the result tree
Throws:
XPathException

isSameNodeInfo

public boolean isSameNodeInfo(NodeInfo other)
Determine whether this is the same node as another node. 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.

getConfiguration

public Configuration getConfiguration()
Description copied from interface: NodeInfo
Get the configuration used to build the tree containing this node.

Specified by:
getConfiguration in interface NodeInfo
Returns:
the Configuration

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.



Copyright (C) Michael H. Kay. All rights reserved.