public abstract class NodeImpl extends Object implements Node, NodeList, EventTarget, Cloneable, Serializable
The Node interface provides shared behaviors such as siblings and children, both for consistancy and so that the most common tree operations may be performed without constantly having to downcast to specific node types. When there is no obvious mapping for one of these queries, it will respond with null. Note that the default behavior is that children are forbidden. To permit them, the subclass ParentNode overrides several methods.
NodeImpl also implements NodeList, so it can return itself in response to the getChildNodes() query. This eliminiates the need for a separate ChildNodeList object. Note that this is an IMPLEMENTATION DETAIL; applications should _never_ assume that this identity exists.
All nodes in a single document must originate in that document. (Note that this is much tighter than "must be same implementation") Nodes are all aware of their ownerDocument, and attempts to mismatch will throw WRONG_DOCUMENT_ERR.
However, to save memory not all nodes always have a direct reference to their ownerDocument. When a node is owned by another node it relies on its owner to store its ownerDocument. Parent nodes always store it though, so there is never more than one level of indirection. And when a node doesn't have an owner, ownerNode refers to its ownerDocument.
This class doesn't directly support mutation events, however, it still implements the EventTarget interface and forward all related calls to the document so that the document class do so.
Modifier and Type | Field and Description |
---|---|
static short |
DOCUMENT_POSITION_CONTAINS |
static short |
DOCUMENT_POSITION_DISCONNECTED |
static short |
DOCUMENT_POSITION_FOLLOWING |
static short |
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |
static short |
DOCUMENT_POSITION_IS_CONTAINED |
static short |
DOCUMENT_POSITION_PRECEDING |
static short |
ELEMENT_DEFINITION_NODE
Element definition node type.
|
protected static short |
FIRSTCHILD |
protected short |
flags |
protected static short |
HASSTRING |
protected static short |
ID |
protected static short |
IGNORABLEWS |
protected static short |
NORMALIZED |
protected static short |
OWNED |
protected NodeImpl |
ownerNode |
protected static short |
READONLY |
protected static short |
SPECIFIED |
protected static short |
SYNCCHILDREN |
protected static short |
SYNCDATA |
static short |
TREE_POSITION_ANCESTOR
The node is an ancestor of the reference node.
|
static short |
TREE_POSITION_DESCENDANT
The node is a descendant of the reference node.
|
static short |
TREE_POSITION_DISCONNECTED
The two nodes are disconnected, they do not have any common ancestor.
|
static short |
TREE_POSITION_EQUIVALENT
The two nodes have an equivalent position.
|
static short |
TREE_POSITION_FOLLOWING
The node follows the reference node.
|
static short |
TREE_POSITION_PRECEDING
The node precedes the reference node.
|
static short |
TREE_POSITION_SAME_NODE
The two nodes are the same.
|
ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_POSITION_CONTAINED_BY, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE
Modifier | Constructor and Description |
---|---|
|
NodeImpl()
Constructor for serialization.
|
protected |
NodeImpl(CoreDocumentImpl ownerDocument)
No public constructor; only subclasses of Node should be
instantiated, and those normally via a Document's factory methods
|
Modifier and Type | Method and Description |
---|---|
void |
addEventListener(String type,
EventListener listener,
boolean useCapture) |
Node |
appendChild(Node newChild)
Adds a child node to the end of the list of children for this node.
|
protected void |
changed()
Denotes that this node has changed.
|
protected int |
changes()
Returns the number of changes to this node.
|
Node |
cloneNode(boolean deep)
Returns a duplicate of a given node.
|
short |
compareDocumentPosition(Node other)
Compares a node with this node with regard to their position in the
document.
|
short |
compareTreePosition(Node other)
Deprecated.
|
boolean |
dispatchEvent(Event event) |
NamedNodeMap |
getAttributes()
Return the collection of attributes associated with this node,
or null if none.
|
String |
getBaseURI()
The absolute base URI of this node or
null if undefined. |
NodeList |
getChildNodes()
Obtain a NodeList enumerating all children of this node.
|
protected Node |
getContainer()
For non-child nodes, the node which "points" to this node.
|
Object |
getFeature(String feature,
String version) |
Node |
getFirstChild()
The first child of this Node, or null if none.
|
Node |
getLastChild()
The first child of this Node, or null if none.
|
int |
getLength()
NodeList method: Count the immediate children of this node
|
String |
getLocalName()
Introduced in DOM Level 2.
|
String |
getNamespaceURI()
Introduced in DOM Level 2.
|
Node |
getNextSibling()
The next child of this node's parent, or null if none
|
abstract String |
getNodeName()
the name of this node.
|
protected int |
getNodeNumber()
Returns the node number
|
abstract short |
getNodeType()
A short integer indicating what type of node this is.
|
String |
getNodeValue()
Returns the node value.
|
Document |
getOwnerDocument()
Find the Document that this Node belongs to (the document in
whose context the Node was created).
|
Node |
getParentNode()
Obtain the DOM-tree parent of this node, or null if it is not
currently active in the DOM tree (perhaps because it has just been
created or removed).
|
String |
getPrefix()
Introduced in DOM Level 2.
|
Node |
getPreviousSibling()
The previous child of this node's parent, or null if none
|
boolean |
getReadOnly()
NON-DOM: Returns true if this node is read-only.
|
String |
getTextContent()
This attribute returns the text content of this node and its
descendants.
|
Object |
getUserData()
NON-DOM:
Returns the user data associated to this node.
|
Object |
getUserData(String key)
Retrieves the object associated to a key on a this node.
|
protected Hashtable |
getUserDataRecord() |
boolean |
hasAttributes()
Returns whether this node (if it is an element) has any attributes.
|
boolean |
hasChildNodes()
Test whether this node has any children.
|
Node |
insertBefore(Node newChild,
Node refChild)
Move one or more node(s) to our list of children.
|
boolean |
isDefaultNamespace(String namespaceURI)
DOM Level 3: Experimental
This method checks if the specified
namespaceURI is the
default namespace or not. |
boolean |
isEqualNode(Node arg)
Tests whether two nodes are equal.
|
boolean |
isSameNode(Node other)
Returns whether this node is the same node as the given one.
|
boolean |
isSupported(String feature,
String version)
Introduced in DOM Level 2.
|
Node |
item(int index)
NodeList method: Return the Nth immediate child of this node, or
null if the index is out of bounds.
|
String |
lookupNamespaceURI(String specifiedPrefix)
DOM Level 3 - Experimental:
Look up the namespace URI associated to the given prefix, starting from this node.
|
String |
lookupPrefix(String namespaceURI)
DOM Level 3 - Experimental:
Look up the prefix associated to the given namespace URI, starting from this node.
|
void |
needsSyncChildren(boolean value) |
void |
normalize()
Puts all
Text nodes in the full depth of the sub-tree
underneath this Node , including attribute nodes, into a
"normal" form where only markup (e.g., tags, comments, processing
instructions, CDATA sections, and entity references) separates
Text nodes, i.e., there are no adjacent Text
nodes. |
Node |
removeChild(Node oldChild)
Remove a child from this Node.
|
void |
removeEventListener(String type,
EventListener listener,
boolean useCapture) |
Node |
replaceChild(Node newChild,
Node oldChild)
Make newChild occupy the location that oldChild used to
have.
|
void |
setNodeValue(String x)
Sets the node value.
|
protected void |
setOwnerDocument(CoreDocumentImpl doc)
NON-DOM
set the ownerDocument of this node
|
void |
setPrefix(String prefix)
Introduced in DOM Level 2.
|
void |
setReadOnly(boolean readOnly,
boolean deep)
NON-DOM: PR-DOM-Level-1-19980818 mentions readonly nodes in conjunction
with Entities, but provides no API to support this.
|
void |
setTextContent(String textContent)
This attribute returns the text content of this node and its
descendants.
|
void |
setUserData(Object data)
NON-DOM: As an alternative to subclassing the DOM, this implementation
has been extended with the ability to attach an object to each node.
|
Object |
setUserData(String key,
Object data,
UserDataHandler handler)
Associate an object to a key on this node.
|
protected void |
synchronizeData()
Override this method in subclass to hook in efficient
internal data structure.
|
String |
toString()
NON-DOM method for debugging convenience.
|
public static final short TREE_POSITION_PRECEDING
public static final short TREE_POSITION_FOLLOWING
public static final short TREE_POSITION_ANCESTOR
public static final short TREE_POSITION_DESCENDANT
public static final short TREE_POSITION_EQUIVALENT
ownerElement
, and two
nodes that are the same.public static final short TREE_POSITION_SAME_NODE
public static final short TREE_POSITION_DISCONNECTED
public static final short DOCUMENT_POSITION_DISCONNECTED
public static final short DOCUMENT_POSITION_PRECEDING
public static final short DOCUMENT_POSITION_FOLLOWING
public static final short DOCUMENT_POSITION_CONTAINS
public static final short DOCUMENT_POSITION_IS_CONTAINED
public static final short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC
public static final short ELEMENT_DEFINITION_NODE
protected NodeImpl ownerNode
protected short flags
protected static final short READONLY
protected static final short SYNCDATA
protected static final short SYNCCHILDREN
protected static final short OWNED
protected static final short FIRSTCHILD
protected static final short SPECIFIED
protected static final short IGNORABLEWS
protected static final short HASSTRING
protected static final short NORMALIZED
protected static final short ID
protected NodeImpl(CoreDocumentImpl ownerDocument)
Every Node knows what Document it belongs to.
public NodeImpl()
public abstract short getNodeType()
getNodeType
in interface Node
public abstract String getNodeName()
getNodeName
in interface Node
public String getNodeValue() throws DOMException
getNodeValue
in interface Node
DOMException(DOMSTRING_SIZE_ERR)
DOMException
public void setNodeValue(String x) throws DOMException
setNodeValue
in interface Node
DOMException(NO_MODIFICATION_ALLOWED_ERR)
DOMException
public Node appendChild(Node newChild) throws DOMException
appendChild
in interface Node
DOMException(HIERARCHY_REQUEST_ERR)
- if newChild is of a
type that shouldn't be a child of this node.DOMException(WRONG_DOCUMENT_ERR)
- if newChild has a
different owner document than we do.DOMException(NO_MODIFICATION_ALLOWED_ERR)
- if this node is
read-only.DOMException
By default we do not accept any children, ParentNode overrides this.
,
ParentNode
public Node cloneNode(boolean deep)
Note: since we never have any children deep is meaningless here, ParentNode overrides this behavior.
cloneNode
in interface Node
Example: Cloning a Text node will copy both the node and the text it
contains.
Example: Cloning something that has children -- Element or Attr, for
example -- will _not_ clone those children unless a "deep clone"
has been requested. A shallow clone of an Attr node will yield an
empty Attr of the same name.
NOTE: Clones will always be read/write, even if the node being cloned
is read-only, to permit applications using only the DOM API to obtain
editable copies of locked portions of the tree.
public Document getOwnerDocument()
getOwnerDocument
in interface Node
protected void setOwnerDocument(CoreDocumentImpl doc)
protected int getNodeNumber()
public Node getParentNode()
getParentNode
in interface Node
public Node getNextSibling()
getNextSibling
in interface Node
public Node getPreviousSibling()
getPreviousSibling
in interface Node
public NamedNodeMap getAttributes()
getAttributes
in interface Node
ElementImpl
public boolean hasAttributes()
hasAttributes
in interface Node
true
if this node has any attributes,
false
otherwise.ElementImpl
public boolean hasChildNodes()
By default we do not have any children, ParentNode overrides this.
hasChildNodes
in interface Node
ParentNode
public NodeList getChildNodes()
NodeLists are "live"; as children are added/removed the NodeList will immediately reflect those changes. Also, the NodeList refers to the actual nodes, so changes to those nodes made via the DOM tree will be reflected in the NodeList and vice versa.
In this implementation, Nodes implement the NodeList interface and provide their own getChildNodes() support. Other DOMs may solve this differently.
getChildNodes
in interface Node
public Node getFirstChild()
By default we do not have any children, ParentNode overrides this.
getFirstChild
in interface Node
ParentNode
public Node getLastChild()
By default we do not have any children, ParentNode overrides this.
getLastChild
in interface Node
ParentNode
public Node insertBefore(Node newChild, Node refChild) throws DOMException
By default we do not accept any children, ParentNode overrides this.
insertBefore
in interface Node
newChild
- The Node to be moved to our subtree. As a
convenience feature, inserting a DocumentNode will instead insert
all its children.refChild
- Current child which newChild should be placed
immediately before. If refChild is null, the insertion occurs
after all existing Nodes, like appendChild().DOMException(HIERARCHY_REQUEST_ERR)
- if newChild is of a
type that shouldn't be a child of this node, or if newChild is an
ancestor of this node.DOMException(WRONG_DOCUMENT_ERR)
- if newChild has a
different owner document than we do.DOMException(NOT_FOUND_ERR)
- if refChild is not a child of
this node.DOMException(NO_MODIFICATION_ALLOWED_ERR)
- if this node is
read-only.DOMException
ParentNode
public Node removeChild(Node oldChild) throws DOMException
By default we do not have any children, ParentNode overrides this.
removeChild
in interface Node
DOMException(NOT_FOUND_ERR)
- if oldChild is not a child of
this node.DOMException(NO_MODIFICATION_ALLOWED_ERR)
- if this node is
read-only.DOMException
ParentNode
public Node replaceChild(Node newChild, Node oldChild) throws DOMException
By default we do not have any children, ParentNode overrides this.
replaceChild
in interface Node
DOMException(HIERARCHY_REQUEST_ERR)
- if newChild is of a
type that shouldn't be a child of this node, or if newChild is
one of our ancestors.DOMException(WRONG_DOCUMENT_ERR)
- if newChild has a
different owner document than we do.DOMException(NOT_FOUND_ERR)
- if oldChild is not a child of
this node.DOMException(NO_MODIFICATION_ALLOWED_ERR)
- if this node is
read-only.DOMException
ParentNode
public int getLength()
By default we do not have any children, ParentNode overrides this.
getLength
in interface NodeList
ParentNode
public Node item(int index)
By default we do not have any children, ParentNode overrides this.
item
in interface NodeList
index
- intParentNode
public void normalize()
Text
nodes in the full depth of the sub-tree
underneath this Node
, including attribute nodes, into a
"normal" form where only markup (e.g., tags, comments, processing
instructions, CDATA sections, and entity references) separates
Text
nodes, i.e., there are no adjacent Text
nodes. This can be used to ensure that the DOM view of a document is
the same as if it were saved and re-loaded, and is useful when
operations (such as XPointer lookups) that depend on a particular
document tree structure are to be used.In cases where the document
contains CDATASections
, the normalize operation alone may
not be sufficient, since XPointers do not differentiate between
Text
nodes and CDATASection
nodes.
Note that this implementation simply calls normalize() on this Node's children. It is up to implementors or Node to override normalize() to take action.
public boolean isSupported(String feature, String version)
Tests whether the DOM implementation implements a specific feature and that feature is supported by this node.
isSupported
in interface Node
feature
- The package name of the feature to test. This is the same
name as what can be passed to the method hasFeature on
DOMImplementation.version
- This is the version number of the package name to
test. In Level 2, version 1, this is the string "2.0". If the version is
not specified, supporting any version of the feature will cause the
method to return true.public String getNamespaceURI()
The namespace URI of this node, or null if it is unspecified. When this node is of any type other than ELEMENT_NODE and ATTRIBUTE_NODE, this is always null and setting it has no effect.
This is not a computed value that is the result of a namespace lookup based on an examination of the namespace declarations in scope. It is merely the namespace URI given at creation time.
For nodes created with a DOM Level 1 method, such as createElement from the Document interface, this is null.
getNamespaceURI
in interface Node
AttrNSImpl
,
ElementNSImpl
public String getPrefix()
The namespace prefix of this node, or null if it is unspecified. When this node is of any type other than ELEMENT_NODE and ATTRIBUTE_NODE this is always null and setting it has no effect.
For nodes created with a DOM Level 1 method, such as createElement from the Document interface, this is null.
getPrefix
in interface Node
AttrNSImpl
,
ElementNSImpl
public void setPrefix(String prefix) throws DOMException
The namespace prefix of this node, or null if it is unspecified. When this node is of any type other than ELEMENT_NODE and ATTRIBUTE_NODE this is always null and setting it has no effect.
For nodes created with a DOM Level 1 method, such as createElement from the Document interface, this is null.
Note that setting this attribute changes the nodeName attribute, which holds the qualified name, as well as the tagName and name attributes of the Element and Attr interfaces, when applicable.
setPrefix
in interface Node
INVALID_CHARACTER_ERR
- Raised if the specified
prefix contains an invalid character.DOMException
AttrNSImpl
,
ElementNSImpl
public String getLocalName()
Returns the local part of the qualified name of this node. For nodes created with a DOM Level 1 method, such as createElement from the Document interface, and for nodes of any type other than ELEMENT_NODE and ATTRIBUTE_NODE this is the same as the nodeName attribute.
getLocalName
in interface Node
AttrNSImpl
,
ElementNSImpl
public void addEventListener(String type, EventListener listener, boolean useCapture)
addEventListener
in interface EventTarget
public void removeEventListener(String type, EventListener listener, boolean useCapture)
removeEventListener
in interface EventTarget
public boolean dispatchEvent(Event event)
dispatchEvent
in interface EventTarget
public String getBaseURI()
null
if undefined.
This value is computed according to . However, when the
Document
supports the feature "HTML" , the base URI is
computed using first the value of the href attribute of the HTML BASE
element if any, and the value of the documentURI
attribute from the Document
interface otherwise.
Element
, a Document
or a a ProcessingInstruction
, this attribute represents
the properties [base URI] defined in . When the node is a
Notation
, an Entity
, or an
EntityReference
, this attribute represents the
properties [declaration base URI] in the . How will this be affected
by resolution of relative namespace URIs issue?It's not.Should this
only be on Document, Element, ProcessingInstruction, Entity, and
Notation nodes, according to the infoset? If not, what is it equal to
on other nodes? Null? An empty string? I think it should be the
parent's.No.Should this be read-only and computed or and actual
read-write attribute?Read-only and computed (F2F 19 Jun 2000 and
teleconference 30 May 2001).If the base HTML element is not yet
attached to a document, does the insert change the Document.baseURI?
Yes. (F2F 26 Sep 2001)getBaseURI
in interface Node
public short compareTreePosition(Node other)
other
- The node to compare against this node.public short compareDocumentPosition(Node other) throws DOMException
compareDocumentPosition
in interface Node
other
- The node to compare against this node.DOMException
public String getTextContent() throws DOMException
Text
node containing the string
this attribute is set to. On getting, no serialization is performed,
the returned string does not contain any markup. No whitespace
normalization is performed, the returned string does not contain the
element content whitespaces . Similarly, on setting, no parsing is
performed either, the input string is taken as pure textual content.
Node type | Content |
---|
Node type | Content |
---|---|
ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE | concatenation of the textContent
attribute value of every child node, excluding COMMENT_NODE and
PROCESSING_INSTRUCTION_NODE nodes |
ATTRIBUTE_NODE, TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE |
nodeValue |
DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE | null |
getTextContent
in interface Node
DOMException
- NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.DOMException
- DOMSTRING_SIZE_ERR: Raised when it would return more characters than
fit in a DOMString
variable on the implementation
platform.public void setTextContent(String textContent) throws DOMException
Text
node containing the string
this attribute is set to. On getting, no serialization is performed,
the returned string does not contain any markup. No whitespace
normalization is performed, the returned string does not contain the
element content whitespaces . Similarly, on setting, no parsing is
performed either, the input string is taken as pure textual content.
Node type | Content |
---|---|
ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE | concatenation of the textContent
attribute value of every child node, excluding COMMENT_NODE and
PROCESSING_INSTRUCTION_NODE nodes |
ATTRIBUTE_NODE, TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE |
nodeValue |
DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE | null |
setTextContent
in interface Node
DOMException
- NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.DOMException
- DOMSTRING_SIZE_ERR: Raised when it would return more characters than
fit in a DOMString
variable on the implementation
platform.public boolean isSameNode(Node other)
Node
references returned by the implementation reference
the same object. When two Node
references are references
to the same object, even if through a proxy, the references may be
used completely interchangably, such that all attributes have the
same values and calling the same DOM method on either reference
always has exactly the same effect.isSameNode
in interface Node
other
- The node to test against.true
if the nodes are the same,
false
otherwise.public boolean isDefaultNamespace(String namespaceURI)
namespaceURI
is the
default namespace or not.isDefaultNamespace
in interface Node
namespaceURI
- The namespace URI to look for.true
if the specified namespaceURI
is the default namespace, false
otherwise.public String lookupPrefix(String namespaceURI)
lookupPrefix
in interface Node
namespaceURI
- public String lookupNamespaceURI(String specifiedPrefix)
lookupNamespaceURI
in interface Node
specifiedPrefix
- public boolean isEqualNode(Node arg)
Node.isSameNode
. All nodes that are the same
will also be equal, though the reverse may not be true.
nodeName
, localName
,
namespaceURI
, prefix
, nodeValue
, baseURI
. This is: they are both null
, or
they have the same length and are character for character identical.
The attributes
NamedNodeMaps
are equal.
This is: they are both null
, or they have the same
length and for each node that exists in one map there is a node that
exists in the other map and is equal, although not necessarily at the
same index.The childNodes
NodeLists
are
equal. This is: they are both null
, or they have the
same length and contain equal nodes at the same index. This is true
for Attr
nodes as for any other type of node. Note that
normalization can affect equality; to avoid this, nodes should be
normalized before being compared.
DocumentType
nodes to be equal, the following
conditions must also be satisfied: The following string attributes
are equal: publicId
, systemId
,
internalSubset
.The entities
NamedNodeMaps
are equal.The notations
NamedNodeMaps
are equal.
ownerDocument
attribute, the specified
attribute for Attr
nodes, the
isWhitespaceInElementContent
attribute for
Text
nodes, as well as any user data or event listeners
registered on the nodes.isEqualNode
in interface Node
arg
- The node to compare equality with.true
otherwise false
.public Object getFeature(String feature, String version)
getFeature
in interface Node
public Object setUserData(String key, Object data, UserDataHandler handler)
getUserData
with the
same key.setUserData
in interface Node
key
- The key to associate the object to.data
- The object to associate to the given key, or
null
to remove any existing association to that key.handler
- The handler to associate to that key, or
null
.DOMObject
previously associated to
the given key on this node, or null
if there was none.public Object getUserData(String key)
setUserData
with the same key.getUserData
in interface Node
key
- The key the object is associated to.DOMObject
associated to the given key
on this node, or null
if there was none.protected Hashtable getUserDataRecord()
public void setReadOnly(boolean readOnly, boolean deep)
Most DOM users should not touch this method. Its anticpated use is during construction of EntityRefernces, where it will be used to lock the contents replicated from Entity so they can't be casually altered. It _could_ be published as a DOM extension, if desired.
Note: since we never have any children deep is meaningless here, ParentNode overrides this behavior.
readOnly
- True or false as desired.deep
- If true, children are also toggled. Note that this will
not change the state of an EntityReference or its children,
which are always read-only.ParentNode
public boolean getReadOnly()
public void setUserData(Object data)
Important Note: You are responsible for removing references to your data on nodes that are no longer used. Failure to do so will prevent the nodes, your data is attached to, to be garbage collected until the whole document is.
data
- the object to store or null to remove any existing referencepublic Object getUserData()
protected void changed()
protected int changes()
protected void synchronizeData()
protected Node getContainer()
public final void needsSyncChildren(boolean value)
public String toString()
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