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package com.sun.org.apache.xerces.internal.dom;
/**
* 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.
* @see DeferredAttrNSImpl
*
* @xerces.internal
*
* @author Andy Clark, IBM
* @author Arnaud Le Hors, IBM
* @version $Id: DeferredAttrImpl.java,v 1.6 2010-11-01 04:39:38 joehw Exp $
* @since PR-DOM-Level-1-19980818.
*/
public final class DeferredAttrImpl
extends AttrImpl
implements DeferredNode {
//
// Constants
//
/** Serialization version. */
static final long serialVersionUID = 6903232312469148636L;
//
// Data
//
/** Node index. */
protected transient int fNodeIndex;
//
// Constructors
//
/**
* This is the deferred constructor. Only the fNodeIndex is given here.
* All other data, can be requested from the ownerDocument via the index.
*/
DeferredAttrImpl(DeferredDocumentImpl ownerDocument, int nodeIndex) {
super(ownerDocument, null);
fNodeIndex = nodeIndex;
needsSyncData(true);
needsSyncChildren(true);
} // (DeferredDocumentImpl,int)
//
// DeferredNode methods
//
/** Returns the node index. */
public int getNodeIndex() {
return fNodeIndex;
}
//
// Protected methods
//
/** Synchronizes the data (name and value) for fast nodes. */
protected void synchronizeData() {
// no need to sync in the future
needsSyncData(false);
// fluff data
DeferredDocumentImpl ownerDocument =
(DeferredDocumentImpl) ownerDocument();
name = ownerDocument.getNodeName(fNodeIndex);
int extra = ownerDocument.getNodeExtra(fNodeIndex);
isSpecified((extra & SPECIFIED) != 0);
isIdAttribute((extra & ID) != 0);
int extraNode = ownerDocument.getLastChild(fNodeIndex);
type = ownerDocument.getTypeInfo(extraNode);
} // synchronizeData()
/**
* 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.
*/
protected void synchronizeChildren() {
DeferredDocumentImpl ownerDocument =
(DeferredDocumentImpl) ownerDocument();
ownerDocument.synchronizeChildren(this, fNodeIndex);
} // synchronizeChildren()
} // class DeferredAttrImpl