2 * Copyright 2001-2006 Internet2
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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8 * http://www.apache.org/licenses/LICENSE-2.0
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10 * Unless required by applicable law or agreed to in writing, software
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11 * distributed under the License is distributed on an "AS IS" BASIS,
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 * See the License for the specific language governing permissions and
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14 * limitations under the License.
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18 * UnknownElement.cpp
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20 * Basic implementations suitable for use as defaults for unrecognized content
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23 #include "internal.h"
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24 #include "exceptions.h"
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25 #include "impl/UnknownElement.h"
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26 #include "util/NDC.h"
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28 #include <log4cpp/Category.hh>
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29 #include <xercesc/framework/MemBufFormatTarget.hpp>
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30 #include <xercesc/framework/MemBufInputSource.hpp>
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31 #include <xercesc/framework/Wrapper4InputSource.hpp>
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32 #include <xercesc/util/XMLUniDefs.hpp>
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34 using namespace xmltooling;
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35 using namespace log4cpp;
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36 using namespace std;
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38 void UnknownElementImpl::releaseDOM()
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41 xmltooling::NDC ndc("releaseDOM");
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43 Category& log=Category::getInstance(XMLTOOLING_LOGCAT".UnknownElementImpl");
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44 log.debug("releasing DOM for unknown content, preserving current DOM in XML form");
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46 // We're losing our DOM, so assuming we have one, we preserve it.
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49 // This takes care of the generic housekeeping now that we've preserved things.
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50 AbstractDOMCachingXMLObject::releaseDOM();
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53 XMLObject* UnknownElementImpl::clone() const
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55 UnknownElementImpl* ret=new UnknownElementImpl();
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57 // If there's no XML locally, serialize this object into the new one.
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58 // Otherwise just copy it over.
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60 serialize(ret->m_xml);
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67 void UnknownElementImpl::serialize(string& s) const
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70 static const XMLCh impltype[] = { chLatin_L, chLatin_S, chNull };
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71 static const XMLCh UTF8[]={ chLatin_U, chLatin_T, chLatin_F, chDigit_8, chNull };
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72 DOMImplementation* impl=DOMImplementationRegistry::getDOMImplementation(impltype);
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73 DOMWriter* serializer=(static_cast<DOMImplementationLS*>(impl))->createDOMWriter();
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74 serializer->setEncoding(UTF8);
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76 MemBufFormatTarget target;
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77 if (!serializer->writeNode(&target,*(getDOM())))
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78 throw XMLObjectException("unable to serialize XML to preserve DOM");
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80 s.append(reinterpret_cast<const char*>(target.getRawBuffer()),target.getLen());
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81 serializer->release();
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84 serializer->release();
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90 DOMElement* UnknownElementMarshaller::marshall(XMLObject* xmlObject, DOMDocument* document) const
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93 xmltooling::NDC ndc("marshall");
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96 Category& log=Category::getInstance(XMLTOOLING_LOGCAT".Marshaller");
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97 log.debug("marshalling unknown content");
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99 UnknownElementImpl* unk=dynamic_cast<UnknownElementImpl*>(xmlObject);
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101 throw MarshallingException("Only objects of class UnknownElementImpl can be marshalled.");
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103 DOMElement* cachedDOM=unk->getDOM();
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105 if (!document || document==cachedDOM->getOwnerDocument()) {
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106 log.debug("XMLObject has a usable cached DOM, using it");
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110 // We have a DOM but it doesn't match the document we were given. This both sucks and blows.
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111 // Without an adoptNode option to maintain the child pointers, we rely on our custom
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112 // implementation class to preserve the XML when we release the existing DOM.
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116 // If we get here, we didn't have a usable DOM (and/or we flushed the one we had).
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117 // We need to reparse the XML we saved off into a new DOM.
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118 bool bindDocument=false;
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119 MemBufInputSource src(reinterpret_cast<const XMLByte*>(unk->m_xml.c_str()),unk->m_xml.length(),"UnknownElementImpl");
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120 Wrapper4InputSource dsrc(&src,false);
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121 log.debug("parsing XML back into DOM tree");
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122 DOMDocument* internalDoc=XMLToolingInternalConfig::getInternalConfig().m_parserPool->parse(dsrc);
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124 // The caller insists on using his own document, so we now have to import the damn thing
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125 // into it. Then we're just dumping the one we built.
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126 log.debug("reimporting new DOM into caller-supplied document");
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127 cachedDOM=static_cast<DOMElement*>(document->importNode(internalDoc->getDocumentElement(), true));
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128 internalDoc->release();
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131 // We just bind the document we built to the object as the result.
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132 document=internalDoc;
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136 // Recache the DOM and clear the serialized copy.
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137 log.debug("caching DOM for XMLObject");
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138 unk->setDOM(cachedDOM, bindDocument);
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139 unk->m_xml.erase();
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143 XMLObject* UnknownElementUnmarshaller::unmarshall(DOMElement* element, bool bindDocument) const
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145 UnknownElementImpl* ret=new UnknownElementImpl();
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146 ret->setDOM(element, bindDocument);
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