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 * A helper class for working with W3C DOM objects.
24 #include "exceptions.h"
25 #include "util/XMLHelper.h"
26 #include "util/XMLConstants.h"
28 #include <xercesc/framework/MemBufFormatTarget.hpp>
29 #include <xercesc/util/XMLUniDefs.hpp>
31 using namespace xmltooling;
34 static const XMLCh type[]={chLatin_t, chLatin_y, chLatin_p, chLatin_e, chNull };
36 bool XMLHelper::hasXSIType(const DOMElement* e)
39 if (e->hasAttributeNS(xmlconstants::XSI_NS, type)) {
47 QName* XMLHelper::getXSIType(const DOMElement* e)
49 DOMAttr* attribute = e->getAttributeNodeNS(xmlconstants::XSI_NS, type);
51 const XMLCh* attributeValue = attribute->getTextContent();
52 if (attributeValue && *attributeValue) {
54 if ((i=XMLString::indexOf(attributeValue,chColon))>0) {
55 XMLCh* prefix=new XMLCh[i+1];
56 XMLString::subString(prefix,attributeValue,0,i);
58 QName* ret=new QName(e->lookupNamespaceURI(prefix), attributeValue + i + 1, prefix);
63 return new QName(e->lookupNamespaceURI(NULL), attributeValue);
71 DOMAttr* XMLHelper::getIdAttribute(const DOMElement* domElement)
73 if(!domElement->hasAttributes()) {
77 DOMNamedNodeMap* attributes = domElement->getAttributes();
79 for(XMLSize_t i = 0; i < attributes->getLength(); i++) {
80 attribute = static_cast<DOMAttr*>(attributes->item(i));
81 if(attribute->isId()) {
89 const XMLObject* XMLHelper::getXMLObjectById(const XMLObject& tree, const XMLCh* id)
91 if (XMLString::equals(id, tree.getXMLID()))
95 const list<XMLObject*>& children = tree.getOrderedChildren();
96 for (list<XMLObject*>::const_iterator i=children.begin(); i!=children.end(); ++i) {
98 ret = getXMLObjectById(*(*i), id);
107 XMLObject* XMLHelper::getXMLObjectById(XMLObject& tree, const XMLCh* id)
109 if (XMLString::equals(id, tree.getXMLID()))
113 const list<XMLObject*>& children = tree.getOrderedChildren();
114 for (list<XMLObject*>::const_iterator i=children.begin(); i!=children.end(); ++i) {
116 ret = getXMLObjectById(*(*i), id);
125 QName* XMLHelper::getNodeQName(const DOMNode* domNode)
128 return new QName(domNode->getNamespaceURI(), domNode->getLocalName(), domNode->getPrefix());
132 QName* XMLHelper::getAttributeValueAsQName(const DOMAttr* attribute)
138 const XMLCh* attributeValue=attribute->getTextContent();
139 if (attributeValue && (i=XMLString::indexOf(attributeValue,chColon))>0) {
140 XMLCh* prefix=new XMLCh[i+1];
141 XMLString::subString(prefix,attributeValue,0,i);
143 QName* ret=new QName(attribute->lookupNamespaceURI(prefix), attributeValue + i + 1, prefix);
148 return new QName(attribute->lookupNamespaceURI(NULL), attributeValue);
151 DOMElement* XMLHelper::appendChildElement(DOMElement* parentElement, DOMElement* childElement)
153 DOMDocument* parentDocument = parentElement->getOwnerDocument();
154 if (childElement->getOwnerDocument() != parentDocument) {
155 childElement = static_cast<DOMElement*>(parentDocument->importNode(childElement, true));
158 parentElement->appendChild(childElement);
162 const XMLCh* XMLHelper::getTextContent(const DOMElement* e)
164 DOMNode* child=e->getFirstChild();
166 if (child->getNodeType()==DOMNode::TEXT_NODE)
167 return child->getNodeValue();
168 child=child->getNextSibling();
173 DOMElement* XMLHelper::getFirstChildElement(const DOMNode* n, const XMLCh* localName)
175 DOMNode* child = n->getFirstChild();
176 while (child && child->getNodeType() != DOMNode::ELEMENT_NODE)
177 child = child->getNextSibling();
178 if (child && localName) {
179 if (!XMLString::equals(localName,child->getLocalName()))
180 return getNextSiblingElement(child, localName);
182 return static_cast<DOMElement*>(child);
185 DOMElement* XMLHelper::getLastChildElement(const DOMNode* n, const XMLCh* localName)
187 DOMNode* child = n->getLastChild();
188 while (child && child->getNodeType() != DOMNode::ELEMENT_NODE)
189 child = child->getPreviousSibling();
190 if (child && localName) {
191 if (!XMLString::equals(localName,child->getLocalName()))
192 return getPreviousSiblingElement(child, localName);
194 return static_cast<DOMElement*>(child);
197 DOMElement* XMLHelper::getFirstChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
199 DOMElement* e = getFirstChildElement(n, localName);
200 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
201 e = getNextSiblingElement(e, localName);
205 DOMElement* XMLHelper::getLastChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
207 DOMElement* e = getLastChildElement(n, localName);
208 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
209 e = getPreviousSiblingElement(e, localName);
213 DOMElement* XMLHelper::getNextSiblingElement(const DOMNode* n, const XMLCh* localName)
215 DOMNode* sib = n->getNextSibling();
216 while (sib && sib->getNodeType() != DOMNode::ELEMENT_NODE)
217 sib = sib->getNextSibling();
218 if (sib && localName) {
219 if (!XMLString::equals(localName,sib->getLocalName()))
220 return getNextSiblingElement(sib, localName);
222 return static_cast<DOMElement*>(sib);
225 DOMElement* XMLHelper::getPreviousSiblingElement(const DOMNode* n, const XMLCh* localName)
227 DOMNode* sib = n->getPreviousSibling();
228 while (sib && sib->getNodeType() != DOMNode::ELEMENT_NODE)
229 sib = sib->getPreviousSibling();
230 if (sib && localName) {
231 if (!XMLString::equals(localName,sib->getLocalName()))
232 return getPreviousSiblingElement(sib, localName);
234 return static_cast<DOMElement*>(sib);
237 DOMElement* XMLHelper::getNextSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
239 DOMElement* e = getNextSiblingElement(n, localName);
240 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
241 e = getNextSiblingElement(e, localName);
245 DOMElement* XMLHelper::getPreviousSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
247 DOMElement* e = getPreviousSiblingElement(n, localName);
248 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
249 e = getPreviousSiblingElement(e, localName);
253 void XMLHelper::serialize(const DOMNode* n, std::string& buf, bool pretty)
255 static const XMLCh impltype[] = { chLatin_L, chLatin_S, chNull };
256 static const XMLCh UTF8[]={ chLatin_U, chLatin_T, chLatin_F, chDigit_8, chNull };
257 DOMImplementation* impl=DOMImplementationRegistry::getDOMImplementation(impltype);
258 DOMWriter* serializer=(static_cast<DOMImplementationLS*>(impl))->createDOMWriter();
259 XercesJanitor<DOMWriter> janitor(serializer);
260 serializer->setEncoding(UTF8);
261 if (pretty && serializer->canSetFeature(XMLUni::fgDOMWRTFormatPrettyPrint, pretty))
262 serializer->setFeature(XMLUni::fgDOMWRTFormatPrettyPrint, pretty);
263 MemBufFormatTarget target;
264 if (!serializer->writeNode(&target,*n))
265 throw XMLParserException("unable to serialize XML");
267 buf.append(reinterpret_cast<const char*>(target.getRawBuffer()),target.getLen());
271 class StreamFormatTarget : public XMLFormatTarget
274 StreamFormatTarget(std::ostream& out) : m_out(out) {}
275 ~StreamFormatTarget() {}
277 void writeChars(const XMLByte *const toWrite, const unsigned int count, XMLFormatter *const formatter) {
278 m_out.write(reinterpret_cast<const char*>(toWrite),count);
290 ostream& XMLHelper::serialize(const DOMNode* n, ostream& out, bool pretty)
292 static const XMLCh impltype[] = { chLatin_L, chLatin_S, chNull };
293 static const XMLCh UTF8[]={ chLatin_U, chLatin_T, chLatin_F, chDigit_8, chNull };
294 DOMImplementation* impl=DOMImplementationRegistry::getDOMImplementation(impltype);
295 DOMWriter* serializer=(static_cast<DOMImplementationLS*>(impl))->createDOMWriter();
296 XercesJanitor<DOMWriter> janitor(serializer);
297 serializer->setEncoding(UTF8);
298 if (pretty && serializer->canSetFeature(XMLUni::fgDOMWRTFormatPrettyPrint, pretty))
299 serializer->setFeature(XMLUni::fgDOMWRTFormatPrettyPrint, pretty);
300 StreamFormatTarget target(out);
301 if (!serializer->writeNode(&target,*n))
302 throw XMLParserException("unable to serialize XML");
306 ostream& xmltooling::operator<<(ostream& ostr, const DOMNode& node)
308 return XMLHelper::serialize(&node, ostr);
311 ostream& xmltooling::operator<<(ostream& ostr, const XMLObject& obj)
313 return ostr << *(obj.marshall());