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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20 * A helper class for working with W3C DOM objects.
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23 #if !defined(__xmltooling_xmlhelper_h__)
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24 #define __xmltooling_xmlhelper_h__
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26 #include <xmltooling/QName.h>
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27 #include <xercesc/dom/DOM.hpp>
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29 using namespace xercesc;
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31 namespace xmltooling {
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34 * A helper class for working with W3C DOM objects.
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36 class XMLTOOL_API XMLHelper
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40 * Checks if the given element has an xsi:type defined for it
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42 * @param e the DOM element
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43 * @return true if there is a type, false if not
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45 static bool hasXSIType(const DOMElement* e);
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48 * Gets the XSI type for a given element if it has one.
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50 * @param e the element
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51 * @return the type or null
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53 static QName* getXSIType(const DOMElement* e);
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56 * Gets the ID attribute of a DOM element.
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58 * @param domElement the DOM element
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59 * @return the ID attribute or null if there isn't one
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61 static DOMAttr* getIdAttribute(const DOMElement* domElement);
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64 * Gets the QName for the given DOM node.
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66 * @param domNode the DOM node
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67 * @return the QName for the element or null if the element was null
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69 static QName* getNodeQName(const DOMNode* domNode);
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72 * Constructs a QName from an attributes value.
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74 * @param attribute the attribute with a QName value
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75 * @return a QName from an attributes value, or null if the given attribute is null
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77 static QName* getAttributeValueAsQName(const DOMAttr* attribute);
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80 * Appends the child Element to the parent Element,
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81 * importing the child Element into the parent's Document if needed.
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83 * @param parentElement the parent Element
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84 * @param childElement the child Element
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85 * @return the child Element that was added (may be an imported copy)
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87 static DOMElement* appendChildElement(DOMElement* parentElement, DOMElement* childElement);
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90 * Checks the qualified name of a node.
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92 * @param n node to check
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93 * @param ns namespace to compare with
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94 * @param local local name to compare with
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95 * @return true iff the node's qualified name matches the other parameters
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97 static bool isNodeNamed(const DOMNode* n, const XMLCh* ns, const XMLCh* local) {
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98 return (n && XMLString::equals(local,n->getLocalName()) && XMLString::equals(ns,n->getNamespaceURI()));
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102 * Returns the first child element of the node if any.
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104 * @param n node to check
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105 * @return the first child node of type Element, or NULL
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107 static DOMElement* getFirstChildElement(const DOMNode* n);
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110 * Returns the last child element of the node if any.
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112 * @param n node to check
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113 * @return the last child node of type Element, or NULL
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115 static DOMElement* getLastChildElement(const DOMNode* n);
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118 * Returns the next sibling element of the node if any.
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120 * @param n node to check
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121 * @return the next sibling node of type Element, or NULL
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123 static DOMElement* getNextSiblingElement(const DOMNode* n);
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126 * Returns the previous sibling element of the node if any.
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128 * @param n node to check
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129 * @return the previous sibling node of type Element, or NULL
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131 static DOMElement* getPreviousSiblingElement(const DOMNode* n);
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134 * Returns the first matching child element of the node if any.
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136 * @param n node to check
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137 * @param ns namespace to compare with
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138 * @param localName local name to compare with
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139 * @return the first matching child node of type Element, or NULL
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141 static DOMElement* getFirstChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName);
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144 * Returns the last matching child element of the node if any.
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146 * @param n node to check
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147 * @param ns namespace to compare with
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148 * @param localName local name to compare with
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149 * @return the last matching child node of type Element, or NULL
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151 static DOMElement* getLastChildElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName);
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154 * Returns the next matching sibling element of the node if any.
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156 * @param n node to check
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157 * @param ns namespace to compare with
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158 * @param localName local name to compare with
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159 * @return the next matching sibling node of type Element, or NULL
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161 static DOMElement* getNextSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName);
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164 * Returns the previous matching sibling element of the node if any.
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166 * @param n node to check
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167 * @param ns namespace to compare with
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168 * @param localName local name to compare with
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169 * @return the previous matching sibling node of type Element, or NULL
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171 static DOMElement* getPreviousSiblingElement(const DOMNode* n, const XMLCh* ns, const XMLCh* localName);
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174 * Returns the content of the first Text node found in the element, if any.
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175 * This is roughly similar to the DOM getTextContent function, but only
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176 * examples the immediate children of the element.
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178 * @param e element to examine
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179 * @return the content of the first Text node found, or NULL
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181 static const XMLCh* getTextContent(const DOMElement* e);
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184 * Serializes the DOM Element provided into a buffer using UTF-8 encoding and
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185 * the default XML serializer available. No manipulation or formatting is applied.
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187 * @param e element to serialize
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188 * @param buf buffer to serialize element into
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190 static void serialize(const DOMElement* e, std::string& buf);
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195 #endif /* __xmltooling_xmlhelper_h__ */
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