org.apache.xerces.dom
Class DeferredAttrImpl

java.lang.Object
  |
  +--org.apache.xerces.dom.NodeImpl
        |
        +--org.apache.xerces.dom.AttrImpl
              |
              +--org.apache.xerces.dom.DeferredAttrImpl
All Implemented Interfaces:
Attr, java.lang.Cloneable, DeferredNode, EventTarget, Node, NodeList, java.io.Serializable

public final class DeferredAttrImpl
extends AttrImpl
implements DeferredNode

Attribute represents an XML-style attribute of an Element. Typically, the allowable values are controlled by its declaration in the Document Type Definition (DTD) governing this kind of document.

If the attribute has not been explicitly assigned a value, but has been declared in the DTD, it will exist and have that default. Only if neither the document nor the DTD specifies a value will the Attribute really be considered absent and have no value; in that case, querying the attribute will return null.

Attributes may have multiple children that contain their data. (XML allows attributes to contain entity references, and tokenized attribute types such as NMTOKENS may have a child for each token.) For convenience, the Attribute object's getValue() method returns the string version of the attribute's value.

Attributes are not children of the Elements they belong to, in the usual sense, and have no valid Parent reference. However, the spec says they _do_ belong to a specific Element, and an INUSE exception is to be thrown if the user attempts to explicitly share them between elements.

Note that Elements do not permit attributes to appear to be shared (see the INUSE exception), so this object's mutability is officially not an issue.

DeferredAttrImpl inherits from AttrImpl which does not support Namespaces. DeferredAttrNSImpl, which inherits from AttrNSImpl, does.

Since:
PR-DOM-Level-1-19980818.
Version:
 
Author:
Andy Clark, IBM, Arnaud Le Hors, IBM
See Also:
DeferredAttrNSImpl, Serialized Form

Field Summary
protected  int fNodeIndex
          Node index.
 
Fields inherited from class org.apache.xerces.dom.AttrImpl
name, textNode, value
 
Fields inherited from class org.apache.xerces.dom.NodeImpl
ELEMENT_DEFINITION_NODE, FIRSTCHILD, flags, HASSTRING, IGNORABLEWS, OWNED, ownerNode, READONLY, SPECIFIED, SYNCCHILDREN, SYNCDATA, UNNORMALIZED
 
Fields inherited from interface org.w3c.dom.Node
ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE
 
Method Summary
 int getNodeIndex()
          Returns the node index.
protected  void synchronizeChildren()
          Synchronizes the node's children with the internal structure.
protected  void synchronizeData()
          Synchronizes the data (name and value) for fast nodes.
 
Methods inherited from class org.apache.xerces.dom.AttrImpl
cloneNode, getChildNodes, getElement, getFirstChild, getLastChild, getLength, getName, getNodeName, getNodeType, getNodeValue, getOwnerElement, getSpecified, getValue, hasChildNodes, insertBefore, item, makeChildNode, normalize, removeChild, replaceChild, setNodeValue, setReadOnly, setSpecified, setValue, toString
 
Methods inherited from class org.apache.xerces.dom.NodeImpl
addEventListener, appendChild, changed, changes, dispatchEvent, getAttributes, getLocalName, getNamespaceURI, getNextSibling, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, getReadOnly, getUserData, hasAttributes, isSupported, removeEventListener, setPrefix, setUserData
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.w3c.dom.Node
appendChild, cloneNode, getAttributes, getChildNodes, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, hasAttributes, hasChildNodes, insertBefore, isSupported, normalize, removeChild, replaceChild, setNodeValue, setPrefix
 

Field Detail

fNodeIndex

protected transient int fNodeIndex
Node index.
Method Detail

getNodeIndex

public int getNodeIndex()
Returns the node index.
Specified by:
getNodeIndex in interface DeferredNode

synchronizeData

protected void synchronizeData()
Synchronizes the data (name and value) for fast nodes.
Overrides:
synchronizeData in class NodeImpl

synchronizeChildren

protected void synchronizeChildren()
Synchronizes the node's children with the internal structure. Fluffing the children at once solves a lot of work to keep the two structures in sync. The problem gets worse when editing the tree -- this makes it a lot easier.
Overrides:
synchronizeChildren in class AttrImpl


Copyright 1999-2001 Apache XML Project. All Rights Reserved.