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291 lines
11 KiB
C++
291 lines
11 KiB
C++
//
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// Document.h
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//
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// Library: XML
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// Package: DOM
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// Module: DOM
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//
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// Definition of the DOM Document class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef DOM_Document_INCLUDED
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#define DOM_Document_INCLUDED
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#include "Poco/AutoReleasePool.h"
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#include "Poco/DOM/AbstractContainerNode.h"
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#include "Poco/DOM/DocumentEvent.h"
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#include "Poco/DOM/Element.h"
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#include "Poco/XML/NamePool.h"
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#include "Poco/XML/XML.h"
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#include "Poco/XML/XMLString.h"
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namespace Poco
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{
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namespace XML
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{
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class NamePool;
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class DocumentType;
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class DOMImplementation;
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class DocumentFragment;
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class Text;
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class Comment;
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class CDATASection;
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class ProcessingInstruction;
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class Attr;
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class EntityReference;
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class NodeList;
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class Entity;
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class Notation;
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class XML_API Document : public AbstractContainerNode, public DocumentEvent
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/// The Document interface represents the entire HTML or XML document. Conceptually,
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/// it is the root of the document tree, and provides the primary access to the
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/// document's data.
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///
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/// Since elements, text nodes, comments, processing instructions, etc. cannot exist
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/// outside the context of a Document, the Document interface also contains the
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/// factory methods needed to create these objects. The Node objects created have a
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/// ownerDocument attribute which associates them with the Document within whose
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/// context they were created.
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{
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public:
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using AutoReleasePool = Poco::AutoReleasePool<DOMObject>;
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explicit Document(NamePool * pNamePool = 0);
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/// Creates a new document. If pNamePool == 0, the document
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/// creates its own name pool, otherwise it uses the given name pool.
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/// Sharing a name pool makes sense for documents containing instances
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/// of the same schema, thus reducing memory usage.
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explicit Document(unsigned long namePoolSize);
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/// Creates a new document using a name pool with the given size, which
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/// should be a prime number (e.g., 251, 509, 1021, 4093).
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Document(DocumentType * pDocumentType, NamePool * pNamePool = 0);
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/// Creates a new document. If pNamePool == 0, the document
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/// creates its own name pool, otherwise it uses the given name pool.
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/// Sharing a name pool makes sense for documents containing instances
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/// of the same schema, thus reducing memory usage.
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Document(DocumentType * pDocumentType, unsigned long namePoolSize);
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/// Creates a new document using a name pool with the given size, which
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/// should be a prime number (e.g., 251, 509, 1021, 4093).
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NamePool & namePool();
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/// Returns a pointer to the documents Name Pool.
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AutoReleasePool & autoReleasePool();
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/// Returns a pointer to the documents Auto Release Pool.
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void collectGarbage();
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/// Releases all objects in the Auto Release Pool.
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void suspendEvents();
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/// Suspends all events until resumeEvents() is called.
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void resumeEvents();
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/// Resumes all events suspended with suspendEvent();
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bool eventsSuspended() const;
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/// Returns true if events are suspended.
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bool events() const;
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/// Returns true if events are not suspended.
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const DocumentType * doctype() const;
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/// The Document Type Declaration (see DocumentType) associated with this document.
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/// For HTML documents as well as XML documents without a document type declaration
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/// this returns null. The DOM Level 1 does not support editing the Document
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/// Type Declaration. docType cannot be altered in any way, including through
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/// the use of methods inherited from the Node interface, such as insertNode
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/// or removeNode.
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const DOMImplementation & implementation() const;
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/// The DOMImplementation object that handles this document. A DOM application
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/// may use objects from multiple implementations.
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Element * documentElement() const;
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/// This is a convenience attribute that allows direct access to the child node
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/// that is the root element of the document. For HTML documents, this is the
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/// element with the tagName "HTML".
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Element * createElement(const XMLString & tagName) const;
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/// Creates an element of the type specified. Note that the instance returned
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/// implements the Element interface, so attributes can be specified directly
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/// on the returned object.
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///
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/// In addition, if there are known attributes with default values, Attr nodes
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/// representing them are automatically created and attached to the element.
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DocumentFragment * createDocumentFragment() const;
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/// Creates an empty DocumentFragment object.
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Text * createTextNode(const XMLString & data) const;
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/// Creates a text node given the specified string.
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Comment * createComment(const XMLString & data) const;
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/// Creates a comment node given the specified string.
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CDATASection * createCDATASection(const XMLString & data) const;
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/// Creates a CDATASection node whose value is the specified string.
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ProcessingInstruction * createProcessingInstruction(const XMLString & target, const XMLString & data) const;
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/// Creates a ProcessingInstruction node given the specified target and data strings.
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Attr * createAttribute(const XMLString & name) const;
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/// Creates an Attr of the given name. Note that the Attr instance can then
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/// be set on an Element using the setAttributeNode method.
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EntityReference * createEntityReference(const XMLString & name) const;
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/// Creates an EntityReference object. In addition, if the referenced entity
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/// is known, the child list of the EntityReference node is made the same as
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/// that of the corresponding Entity node.
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NodeList * getElementsByTagName(const XMLString & name) const;
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/// Returns a NodeList of all Elements with a given tag name in the order
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/// in which they would be encountered in a preorder traversal of the
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/// document tree.
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///
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/// The returned NodeList must be released with a call to release()
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/// when no longer needed.
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// DOM Level 2
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Node * importNode(Node * importedNode, bool deep);
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/// Imports a node from another document to this document. The returned node
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/// has no parent; (parentNode is null). The source node is not altered or removed
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/// from the original document; this method creates a new copy of the source
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/// node.
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/// For all nodes, importing a node creates a node object owned by the importing
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/// document, with attribute values identical to the source node's nodeName
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/// and nodeType, plus the attributes related to namespaces (prefix, localName,
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/// and namespaceURI). As in the cloneNode operation on a Node, the source node
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/// is not altered.
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/// Additional information is copied as appropriate to the nodeType, attempting
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/// to mirror the behavior expected if a fragment of XML or HTML source was
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/// copied from one document to another, recognizing that the two documents
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/// may have different DTDs in the XML case.
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Element * createElementNS(const XMLString & namespaceURI, const XMLString & qualifiedName) const;
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/// Creates an element of the given qualified name and namespace URI.
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Attr * createAttributeNS(const XMLString & namespaceURI, const XMLString & qualifiedName) const;
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/// Creates an attribute of the given qualified name and namespace URI.
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NodeList * getElementsByTagNameNS(const XMLString & namespaceURI, const XMLString & localName) const;
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/// Returns a NodeList of all the Elements with a given local name and
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/// namespace URI in the order in which they are encountered in a
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/// preorder traversal of the Document tree.
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Element * getElementById(const XMLString & elementId) const;
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/// Returns the Element whose ID is given by elementId. If no such
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/// element exists, returns null. Behavior is not defined if more
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/// than one element has this ID.
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///
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/// Note: The DOM implementation must have information that says
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/// which attributes are of type ID. Attributes with the name "ID"
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/// are not of type ID unless so defined. Implementations that do
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/// not know whether attributes are of type ID or not are expected to
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/// return null. This implementation therefore returns null.
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///
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/// See also the non-standard two argument variant of getElementById()
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/// and getElementByIdNS().
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// DocumentEvent
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Event * createEvent(const XMLString & eventType) const;
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// Node
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const XMLString & nodeName() const;
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unsigned short nodeType() const;
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// EventTarget
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bool dispatchEvent(Event * evt);
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// Extensions
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Entity *
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createEntity(const XMLString & name, const XMLString & publicId, const XMLString & systemId, const XMLString & notationName) const;
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/// Creates an Entity with the given name, publicId, systemId and notationName.
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///
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/// This method is not part of the W3C Document Object Model.
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Notation * createNotation(const XMLString & name, const XMLString & publicId, const XMLString & systemId) const;
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/// Creates a Notation with the given name, publicId and systemId.
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///
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/// This method is not part of the W3C Document Object Model.
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Element * getElementById(const XMLString & elementId, const XMLString & idAttribute) const;
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/// Returns the first Element whose ID attribute (given in idAttribute)
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/// has the given elementId. If no such element exists, returns null.
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///
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/// This method is an extension to the W3C Document Object Model.
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Element *
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getElementByIdNS(const XMLString & elementId, const XMLString & idAttributeURI, const XMLString & idAttributeLocalName) const;
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/// Returns the first Element whose ID attribute (given in idAttributeURI and idAttributeLocalName)
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/// has the given elementId. If no such element exists, returns null.
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///
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/// This method is an extension to the W3C Document Object Model.
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protected:
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~Document();
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Node * copyNode(bool deep, Document * pOwnerDocument) const;
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DocumentType * getDoctype();
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void setDoctype(DocumentType * pDoctype);
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private:
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DocumentType * _pDocumentType;
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NamePool * _pNamePool;
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AutoReleasePool _autoReleasePool;
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int _eventSuspendLevel;
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static const XMLString NODE_NAME;
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friend class DOMBuilder;
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};
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//
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// inlines
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//
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inline NamePool & Document::namePool()
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{
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return *_pNamePool;
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}
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inline Document::AutoReleasePool & Document::autoReleasePool()
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{
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return _autoReleasePool;
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}
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inline const DocumentType * Document::doctype() const
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{
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return _pDocumentType;
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}
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inline DocumentType * Document::getDoctype()
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{
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return _pDocumentType;
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}
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}
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} // namespace Poco::XML
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#endif // DOM_Document_INCLUDED
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