2 * Copyright 2001-2006 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(&chNull), 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 QName* XMLHelper::getNodeQName(const DOMNode* domNode)
92 return new QName(domNode->getNamespaceURI(), domNode->getLocalName(), domNode->getPrefix());
96 QName* XMLHelper::getAttributeValueAsQName(const DOMAttr* attribute)
102 const XMLCh* attributeValue=attribute->getTextContent();
103 if (attributeValue && (i=XMLString::indexOf(attributeValue,chColon))>0) {
104 XMLCh* prefix=new XMLCh[i+1];
105 XMLString::subString(prefix,attributeValue,0,i);
107 QName* ret=new QName(attribute->lookupNamespaceURI(prefix), attributeValue + i + 1, prefix);
112 return new QName(attribute->lookupNamespaceURI(NULL), attributeValue);
115 DOMElement* XMLHelper::appendChildElement(DOMElement* parentElement, DOMElement* childElement)
117 DOMDocument* parentDocument = parentElement->getOwnerDocument();
118 if (childElement->getOwnerDocument() != parentDocument) {
119 childElement = static_cast<DOMElement*>(parentDocument->importNode(childElement, true));
122 parentElement->appendChild(childElement);
126 const XMLCh* XMLHelper::getTextContent(const DOMElement* e)
128 DOMNode* child=e->getFirstChild();
130 if (child->getNodeType()==DOMNode::TEXT_NODE)
131 return child->getNodeValue();
132 child=child->getNextSibling();
137 DOMElement* XMLHelper::getFirstChildElement(const DOMNode* n, const XMLCh* localName)
139 DOMNode* child = n->getFirstChild();
140 while (child && child->getNodeType() != DOMNode::ELEMENT_NODE)
141 child = child->getNextSibling();
142 if (child && localName) {
143 if (!XMLString::equals(localName,child->getLocalName()))
144 return getNextSiblingElement(child, localName);
146 return static_cast<DOMElement*>(child);
149 DOMElement* XMLHelper::getLastChildElement(const DOMNode* n, const XMLCh* localName)
151 DOMNode* child = n->getLastChild();
152 while (child && child->getNodeType() != DOMNode::ELEMENT_NODE)
153 child = child->getPreviousSibling();
154 if (child && localName) {
155 if (!XMLString::equals(localName,child->getLocalName()))
156 return getPreviousSiblingElement(child, localName);
158 return static_cast<DOMElement*>(child);
161 DOMElement* XMLHelper::getFirstChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
163 DOMElement* e = getFirstChildElement(n, localName);
164 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
165 e = getNextSiblingElement(e, localName);
169 DOMElement* XMLHelper::getLastChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
171 DOMElement* e = getLastChildElement(n, localName);
172 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
173 e = getPreviousSiblingElement(e, localName);
177 DOMElement* XMLHelper::getNextSiblingElement(const DOMNode* n, const XMLCh* localName)
179 DOMNode* sib = n->getNextSibling();
180 while (sib && sib->getNodeType() != DOMNode::ELEMENT_NODE)
181 sib = sib->getNextSibling();
182 if (sib && localName) {
183 if (!XMLString::equals(localName,sib->getLocalName()))
184 return getNextSiblingElement(sib, localName);
186 return static_cast<DOMElement*>(sib);
189 DOMElement* XMLHelper::getPreviousSiblingElement(const DOMNode* n, const XMLCh* localName)
191 DOMNode* sib = n->getPreviousSibling();
192 while (sib && sib->getNodeType() != DOMNode::ELEMENT_NODE)
193 sib = sib->getPreviousSibling();
194 if (sib && localName) {
195 if (!XMLString::equals(localName,sib->getLocalName()))
196 return getPreviousSiblingElement(sib, localName);
198 return static_cast<DOMElement*>(sib);
201 DOMElement* XMLHelper::getNextSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
203 DOMElement* e = getNextSiblingElement(n, localName);
204 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
205 e = getNextSiblingElement(e, localName);
209 DOMElement* XMLHelper::getPreviousSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName)
211 DOMElement* e = getPreviousSiblingElement(n, localName);
212 while (e && !XMLString::equals(e->getNamespaceURI(),ns))
213 e = getPreviousSiblingElement(e, localName);
217 void XMLHelper::serialize(const DOMNode* n, std::string& buf)
219 static const XMLCh impltype[] = { chLatin_L, chLatin_S, chNull };
220 static const XMLCh UTF8[]={ chLatin_U, chLatin_T, chLatin_F, chDigit_8, chNull };
221 DOMImplementation* impl=DOMImplementationRegistry::getDOMImplementation(impltype);
222 DOMWriter* serializer=(static_cast<DOMImplementationLS*>(impl))->createDOMWriter();
223 XercesJanitor<DOMWriter> janitor(serializer);
224 serializer->setEncoding(UTF8);
225 MemBufFormatTarget target;
226 if (!serializer->writeNode(&target,*n))
227 throw XMLParserException("unable to serialize XML");
229 buf.append(reinterpret_cast<const char*>(target.getRawBuffer()),target.getLen());
233 class StreamFormatTarget : public XMLFormatTarget
236 StreamFormatTarget(std::ostream& out) : m_out(out) {}
237 ~StreamFormatTarget() {}
239 void writeChars(const XMLByte *const toWrite, const unsigned int count, XMLFormatter *const formatter) {
240 m_out.write(reinterpret_cast<const char*>(toWrite),count);
252 void XMLHelper::serialize(const DOMNode* n, std::ostream& out)
254 static const XMLCh impltype[] = { chLatin_L, chLatin_S, chNull };
255 static const XMLCh UTF8[]={ chLatin_U, chLatin_T, chLatin_F, chDigit_8, chNull };
256 DOMImplementation* impl=DOMImplementationRegistry::getDOMImplementation(impltype);
257 DOMWriter* serializer=(static_cast<DOMImplementationLS*>(impl))->createDOMWriter();
258 XercesJanitor<DOMWriter> janitor(serializer);
259 serializer->setEncoding(UTF8);
260 StreamFormatTarget target(out);
261 if (!serializer->writeNode(&target,*n))
262 throw XMLParserException("unable to serialize XML");
265 ostream& xmltooling::operator<<(ostream& ostr, const DOMNode& node)
267 XMLHelper::serialize(&node, ostr);
271 ostream& xmltooling::operator<<(ostream& ostr, const XMLObject& obj)
273 return ostr << obj.marshall();