org.apache.xerces.dom
Class EntityReferenceImpl

java.lang.Object
  org.apache.xerces.dom.NodeImpl
      org.apache.xerces.dom.ChildNode
          org.apache.xerces.dom.ParentNode
              org.apache.xerces.dom.EntityReferenceImpl

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, EntityReference, EventTarget, Node, NodeList

Direct Known Subclasses:

DeferredEntityReferenceImpl

public class EntityReferenceImpl
extends ParentNode
implements EntityReference

EntityReference models the XML &entityname; syntax, when used for entities defined by the DOM. Entities hardcoded into XML, such as character entities, should instead have been translated into text by the code which generated the DOM tree.

An XML processor has the alternative of fully expanding Entities into the normal document tree. If it does so, no EntityReference nodes will appear.

Similarly, non-validating XML processors are not required to read or process entity declarations made in the external subset or declared in external parameter entities. Hence, some applications may not make the replacement value available for Parsed Entities of these types.

EntityReference behaves as a read-only node, and the children of the EntityReference (which reflect those of the Entity, and should also be read-only) give its replacement value, if any. They are supposed to automagically stay in synch if the DocumentType is updated with new values for the Entity.

The defined behavior makes efficient storage difficult for the DOM implementor. We can't just look aside to the Entity's definition in the DocumentType since those nodes have the wrong parent (unless we can come up with a clever "imaginary parent" mechanism). We must at least appear to clone those children... which raises the issue of keeping the reference synchronized with its parent. This leads me back to the "cached image of centrally defined data" solution, much as I dislike it.

For now I have decided, since REC-DOM-Level-1-19980818 doesn't cover this in much detail, that synchronization doesn't have to be considered while the user is deep in the tree. That is, if you're looking within one of the EntityReferennce's children and the Entity changes, you won't be informed; instead, you will continue to access the same object -- which may or may not still be part of the tree. This is the same behavior that obtains elsewhere in the DOM if the subtree you're looking at is deleted from its parent, so it's acceptable here. (If it really bothers folks, we could set things up so deleted subtrees are walked and marked invalid, but that's not part of the DOM's defined behavior.)

As a result, only the EntityReference itself has to be aware of changes in the Entity. And it can take advantage of the same structure-change-monitoring code I implemented to support DeepNodeList.

Since:

PR-DOM-Level-1-19980818.

Version:

$Id: EntityReferenceImpl.java 447266 2006-09-18 05:57:49Z mrglavas $

Author:

Arnaud Le Hors, IBM, Joe Kesselman, IBM, Andy Clark, IBM, Ralf Pfeiffer, IBM

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.xerces.dom.NodeImpl

DOCUMENT_POSITION_CONTAINS, DOCUMENT_POSITION_DISCONNECTED, DOCUMENT_POSITION_FOLLOWING, DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, DOCUMENT_POSITION_IS_CONTAINED, DOCUMENT_POSITION_PRECEDING, ELEMENT_DEFINITION_NODE, TREE_POSITION_ANCESTOR, TREE_POSITION_DESCENDANT, TREE_POSITION_DISCONNECTED, TREE_POSITION_EQUIVALENT, TREE_POSITION_FOLLOWING, TREE_POSITION_PRECEDING, TREE_POSITION_SAME_NODE

Fields inherited from interface org.w3c.dom.Node

ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_POSITION_CONTAINED_BY, DOCUMENT_POSITION_CONTAINS, DOCUMENT_POSITION_DISCONNECTED, DOCUMENT_POSITION_FOLLOWING, DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, DOCUMENT_POSITION_PRECEDING, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE

Constructor Summary

EntityReferenceImpl(CoreDocumentImpl ownerDoc, java.lang.String name)
Factory constructor.

Method Summary

Node	cloneNode(boolean deep) Clone node.
java.lang.String	getBaseURI() Returns the absolute base URI of this node or null if the implementation wasn't able to obtain an absolute URI.
java.lang.String	getNodeName() Returns the name of the entity referenced
short	getNodeType() A short integer indicating what type of node this is.
void	setBaseURI(java.lang.String uri) NON-DOM: set base uri
void	setReadOnly(boolean readOnly, boolean deep) NON-DOM: sets the node and its children value.

Methods inherited from class org.apache.xerces.dom.ParentNode

getChildNodes, getFirstChild, getLastChild, getLength, getOwnerDocument, getTextContent, hasChildNodes, insertBefore, isEqualNode, item, normalize, removeChild, replaceChild, setTextContent

Methods inherited from class org.apache.xerces.dom.ChildNode

getNextSibling, getParentNode, getPreviousSibling

Methods inherited from class org.apache.xerces.dom.NodeImpl

addEventListener, appendChild, compareDocumentPosition, compareTreePosition, dispatchEvent, getAttributes, getFeature, getLocalName, getNamespaceURI, getNodeValue, getPrefix, getReadOnly, getUserData, getUserData, hasAttributes, isDefaultNamespace, isSameNode, isSupported, lookupNamespaceURI, lookupPrefix, needsSyncChildren, removeEventListener, setNodeValue, setPrefix, setUserData, setUserData, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.w3c.dom.Node

appendChild, compareDocumentPosition, getAttributes, getChildNodes, getFeature, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNextSibling, getNodeValue, getOwnerDocument, getParentNode, getPrefix, getPreviousSibling, getTextContent, getUserData, hasAttributes, hasChildNodes, insertBefore, isDefaultNamespace, isEqualNode, isSameNode, isSupported, lookupNamespaceURI, lookupPrefix, normalize, removeChild, replaceChild, setNodeValue, setPrefix, setTextContent, setUserData

Constructor Detail

EntityReferenceImpl

public EntityReferenceImpl(CoreDocumentImpl ownerDoc,
                           java.lang.String name)

Factory constructor.

Method Detail

getNodeType

public short getNodeType()

A short integer indicating what type of node this is. The named constants for this value are defined in the org.w3c.dom.Node interface.

Specified by:

getNodeType in interface Node

Specified by:

getNodeType in class NodeImpl

getNodeName

public java.lang.String getNodeName()

Returns the name of the entity referenced

Specified by:

getNodeName in interface Node

Specified by:

getNodeName in class NodeImpl

cloneNode

public Node cloneNode(boolean deep)

Clone node.

Specified by:

cloneNode in interface Node

Overrides:

cloneNode in class ParentNode

Parameters:

deep - If true, recursively clone the subtree under the specified node; if false, clone only the node itself (and its attributes, if it is an Element).

Returns:

The duplicate node.

See Also:

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.

getBaseURI

public java.lang.String getBaseURI()

Returns the absolute base URI of this node or null if the implementation wasn't able to obtain an absolute URI. Note: If the URI is malformed, a null is returned.

Specified by:

getBaseURI in interface Node

Overrides:

getBaseURI in class NodeImpl

Returns:

The absolute base URI of this node or null.

Since:

DOM Level 3

setBaseURI

public void setBaseURI(java.lang.String uri)

NON-DOM: set base uri

setReadOnly

public void setReadOnly(boolean readOnly,
                        boolean deep)

NON-DOM: sets the node and its children value.

Note: make sure that entity reference and its kids could be set readonly.

Overrides:

setReadOnly in class ParentNode

Parameters:

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.

See Also:

Note: this will not change the state of an EntityReference or its children, which are always read-only.