2 * Copyright 2001-2007 Internet2
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 * Abstract interface to objects that can be manipulated in and out of XML form.
23 #ifndef __xmltooling_xmlobj_h__
24 #define __xmltooling_xmlobj_h__
26 #include <xmltooling/QName.h>
27 #include <xmltooling/Namespace.h>
32 #include <xercesc/dom/DOM.hpp>
34 using namespace xercesc;
36 #ifndef XMLTOOLING_NO_XMLSEC
37 namespace xmlsignature {
38 class XMLTOOL_API Signature;
42 #if defined (_MSC_VER)
43 #pragma warning( push )
44 #pragma warning( disable : 4250 4251 )
47 namespace xmltooling {
50 * Object that represents an XML Element that has been unmarshalled into this C++ object.
52 class XMLTOOL_API XMLObject
55 virtual ~XMLObject() {}
58 * Creates a copy of the object, along with all of its children.
60 * The new object tree will be completely distinct and independent of
61 * the original in all respects.
63 virtual XMLObject* clone() const=0;
66 * Specialized function for detaching a child object from its parent
67 * <strong>while disposing of the parent</strong>.
69 * This is not a generic way of detaching any child object, but only of
70 * pruning a single child from the root of an XMLObject tree. If the
71 * detached XMLObject's parent is itself a child, an exception will be
72 * thrown. It's mainly useful for turning a child into the new root of
73 * the tree without having to clone the child.
75 virtual void detach()=0;
78 * Gets the QName for this element. This QName <strong>MUST</strong>
79 * contain the namespace URI, namespace prefix, and local element name.
81 * @return constant reference to the QName for this object
83 virtual const QName& getElementQName() const=0;
86 * Gets the namespaces that are scoped to this element.
88 * The caller MUST NOT modify the set returned, but may use any
89 * non-modifying operations or algorithms on it. Iterators will
90 * remain valid unless the set member referenced is removed using
91 * the removeNamespace method.
93 * @return the namespaces that are scoped to this element
95 virtual const std::set<Namespace>& getNamespaces() const=0;
98 * Adds a namespace to the ones already scoped to this element
100 * @param ns the namespace to add
102 virtual void addNamespace(const Namespace& ns) const=0;
105 * Removes a namespace from this element
107 * @param ns the namespace to remove
109 virtual void removeNamespace(const Namespace& ns)=0;
112 * Gets the XML schema type of this element. This translates to contents the xsi:type
113 * attribute for the element.
115 * @return XML schema type of this element
117 virtual const QName* getSchemaType() const=0;
120 * Gets the value of the ID attribute set on this object, if any.
122 * @return an ID value or NULL
124 virtual const XMLCh* getXMLID() const=0;
127 * Checks to see if this object has a parent.
129 * @return true if the object has a parent, false if not
131 virtual bool hasParent() const=0;
134 * Gets the parent of this element or null if there is no parent.
136 * @return the parent of this element or null
138 virtual XMLObject* getParent() const=0;
141 * Sets the parent of this element.
143 * @param parent the parent of this element
145 virtual void setParent(XMLObject* parent)=0;
148 * Checks if this XMLObject has children.
150 * @return true if this XMLObject has children, false if not
152 virtual bool hasChildren() const=0;
155 * Returns an unmodifiable list of child objects in the order that they
156 * should appear in the serialized representation.
158 * The validity of the returned list is not maintained if any non-const
159 * operations are performed on the parent object.
161 * @return the list of children
163 virtual const std::list<XMLObject*>& getOrderedChildren() const=0;
166 * Used by a child's detach method to isolate the child from
167 * this parent object in preparation for destroying the parent
170 * @param child the child object to remove
172 virtual void removeChild(XMLObject* child)=0;
175 * Returns the text content at the specified position relative to
176 * any child elements. A zero represents leading text, 1 comes after
177 * the first child, and so forth.
179 * @param position the relative child element position of the text
180 * @return the designated text value
182 virtual const XMLCh* getTextContent(unsigned int position=0) const=0;
185 * Sets (or clears) text content relative to a child element's position.
187 * @param value value to set, or NULL to clear
188 * @param position position relative to child element
190 virtual void setTextContent(const XMLCh* value, unsigned int position=0)=0;
193 * Gets the DOM representation of this XMLObject, if one exists.
195 * @return the DOM representation of this XMLObject
197 virtual DOMElement* getDOM() const=0;
200 * Sets the DOM representation of this XMLObject.
202 * @param dom DOM representation of this XMLObject
203 * @param bindDocument true if the object should take ownership of the associated Document
205 virtual void setDOM(DOMElement* dom, bool bindDocument=false) const=0;
208 * Assigns ownership of a DOM document to the XMLObject.
209 * This binds the lifetime of the document to the lifetime of the object.
211 * @param doc DOM document bound to this object
213 virtual void setDocument(DOMDocument* doc) const=0;
216 * Releases the DOM representation of this XMLObject, if there is one.
218 virtual void releaseDOM() const=0;
221 * Releases the DOM representation of this XMLObject's parent.
223 * @param propagateRelease true if all ancestors of this element should release their DOM
225 virtual void releaseParentDOM(bool propagateRelease=true) const=0;
228 * Releases the DOM representation of this XMLObject's children.
230 * @param propagateRelease true if all descendants of this element should release their DOM
232 virtual void releaseChildrenDOM(bool propagateRelease=true) const=0;
235 * A convenience method that is equal to calling releaseDOM() then releaseParentDOM(true).
237 void releaseThisandParentDOM() const {
240 releaseParentDOM(true);
245 * A convenience method that is equal to calling releaseChildrenDOM(true) then releaseDOM().
247 void releaseThisAndChildrenDOM() const {
249 releaseChildrenDOM(true);
255 * Marshalls the XMLObject, and its children, into a DOM element.
256 * If a document is supplied, then it will be used to create the resulting elements.
257 * If the document does not have a Document Element set, then the resulting
258 * element will be set as the Document Element. If no document is supplied, then
259 * a new document will be created and bound to the lifetime of the root object being
260 * marshalled, unless an existing DOM can be reused without creating a new document.
262 * @param document the DOM document the marshalled element will be placed in, or NULL
263 * @param sigs ordered array of signatures to create after marshalling is complete
264 * @return the DOM element representing this XMLObject
266 * @throws MarshallingException thrown if there is a problem marshalling the given object
267 * @throws SignatureException thrown if a problem occurs during signature creation
269 virtual DOMElement* marshall(
270 DOMDocument* document=NULL
271 #ifndef XMLTOOLING_NO_XMLSEC
272 ,const std::vector<xmlsignature::Signature*>* sigs=NULL
277 * Marshalls the XMLObject and appends it as a child of the given parent element.
279 * <strong>NOTE:</strong> The given Element must be within a DOM tree rooted in
280 * the Document owning the given Element.
282 * @param parentElement the parent element to append the resulting DOM tree
283 * @param sigs ordered array of signatures to create after marshalling is complete
284 * @return the marshalled element tree
286 * @throws MarshallingException thrown if the given XMLObject can not be marshalled.
287 * @throws SignatureException thrown if a problem occurs during signature creation
289 virtual DOMElement* marshall(
290 DOMElement* parentElement
291 #ifndef XMLTOOLING_NO_XMLSEC
292 ,const std::vector<xmlsignature::Signature*>* sigs=NULL
297 * Unmarshalls the given W3C DOM element into the XMLObject.
298 * The root of a given XML construct should be unmarshalled with the bindDocument parameter
301 * @param element the DOM element to unmarshall
302 * @param bindDocument true iff the resulting XMLObject should take ownership of the DOM's Document
304 * @return the unmarshalled XMLObject
306 * @throws UnmarshallingException thrown if an error occurs unmarshalling the DOM element into the XMLObject
308 virtual XMLObject* unmarshall(DOMElement* element, bool bindDocument=false)=0;
313 XMLObject& operator=(const XMLObject& src);
318 #if defined (_MSC_VER)
319 #pragma warning( pop )
322 #endif /* __xmltooling_xmlobj_h__ */