EntityReferenceImpl.cpp
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- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
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- /*
- * $Id: EntityReferenceImpl.cpp,v 1.4 2003/05/22 02:26:50 knoaman Exp $
- */
- /**
- * 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.
- * <P>
- * An XML processor has the alternative of fully expanding Entities
- * into the normal document tree. If it does so, no EntityReference nodes
- * will appear.
- * <P>
- * 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.
- * <P>
- * 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.
- * <P>
- * 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.
- * <P>
- * 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.)
- * <P>
- * 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.
- *
- * @author Rania Y. Khalaf
- * @author Joseph Kesselman
- * @since PR-DOM-Level-1-19980818.
- */
- #include "DocumentImpl.hpp"
- #include "DocumentTypeImpl.hpp"
- #include "EntityImpl.hpp"
- #include "EntityReferenceImpl.hpp"
- #include "DOM_DOMException.hpp"
- #include "DOM_Node.hpp"
- #include "NamedNodeMapImpl.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- EntityReferenceImpl::EntityReferenceImpl(DocumentImpl *ownerDoc,
- const DOMString &entityName)
- : ParentNode(ownerDoc)
- {
- name = entityName.clone();
- // EntityReference behaves as a read-only node, since its contents
- // reflect the Entity it refers to -- but see setNodeName().
- //retrieve the corresponding entity content
- if (ownerDoc) {
- if (ownerDoc->getDoctype()) {
- if (ownerDoc->getDoctype()->getEntities()) {
- EntityImpl* entity = (EntityImpl*)ownerDoc->getDoctype()->getEntities()->getNamedItem(entityName);
- if (entity) {
- EntityReferenceImpl* refEntity = entity->getEntityRef();
- if (refEntity)
- cloneChildren(*refEntity);
- }
- }
- }
- }
- setReadOnly(true, true);
- }
- EntityReferenceImpl::EntityReferenceImpl(const EntityReferenceImpl &other,
- bool deep)
- : ParentNode(other)
- {
- name = other.name.clone();
- if (deep)
- cloneChildren(other);
- setReadOnly(true, true);
- }
- EntityReferenceImpl::~EntityReferenceImpl()
- {
- }
- NodeImpl *EntityReferenceImpl::cloneNode(bool deep)
- {
- return new (getOwnerDocument()->getMemoryManager()) EntityReferenceImpl(*this, deep);
- }
- DOMString EntityReferenceImpl::getNodeName()
- {
- return name;
- };
- short EntityReferenceImpl::getNodeType() {
- return DOM_Node::ENTITY_REFERENCE_NODE;
- };
- bool EntityReferenceImpl::isEntityReference()
- {
- return true;
- }
- /**
- * EntityRef is already, and must be, a read-only node. Attempts to change
- * that will throw a NO_MODIFICATION_ALLOWED_ERR DOMException.
- * <P>
- * If you want to alter its contents, edit the Entity definition.
- *
- * @param readOnly boolean
- */
- void EntityReferenceImpl::setReadOnly(bool readOnl,bool deep)
- {
- if(getOwnerDocument()->getErrorChecking() && readOnl==false)
- throw DOM_DOMException(DOM_DOMException::NO_MODIFICATION_ALLOWED_ERR,null);
- ParentNode::setReadOnly(readOnl,deep);
- }
- XERCES_CPP_NAMESPACE_END