author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004-2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Namespace node functions |
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* |
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*/ |
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#ifndef XMLENGINE_NAMESPACE_H_INCLUDED |
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#define XMLENGINE_NAMESPACE_H_INCLUDED |
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#include "xmlengnode.h" |
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/** |
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* Represents existing namespace declaration in DOM tree <b>OR</b> namespace node returned |
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* in RXmlEngNodeSet as a result of some XPath expression. |
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* |
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* All elements and attributes may have a namespace instance associated. |
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* Once put in element, a namespace declaration (instance of TXmlEngNamespace) may be |
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* referred to by all attributes and descentants of the element (unless |
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* prefix that this namespace-to-prefix binding uses is overriden somewhere below in the document tree) |
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* |
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* <b>General rules of namespace handling:</b> |
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* |
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* - <b>NULL</b> prefix in namespace node means NO PREFIX. ""(empty string '\\0') can be used for specifying |
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* absense of prefix when setting it, however <b>NULL</b> will be stored and returned. |
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* |
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* - <b>NULL</b> value of namespace URI is legal only with <b>NULL</b> prefix and only met in |
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* undeclaration of namespace (<i>xmlns=""</i>). <b>""</b> (empty string) can be used too, however it |
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* will be returned as <b>NULL</b>. |
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* |
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* - <b>NULL</b> or <b>""</b> namespace <b>URI</b> with non-<b>NULL</b> prefix is illegal acording to the XML specification. |
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* |
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* - Namespace of a element is <b>default</b> if it is associated with some namespace declaration with <b>NULL</b> prefix. |
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* |
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* - Elements are never associated with namespace undeclarations (<b>xmlns=""</b>), instead, such elements have no |
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* namespace declaration referred to. |
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* |
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* - Attributes do not have <i>default</i> namespace. Even if it is effective at element scope, |
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* default namespace declaration is not applied to element's attributes (according to the XML specification) |
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* |
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* - Namespace of a node (element or attribute) is <b>undefined</b> if no namespace declaration is |
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* associated with it. |
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* |
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* - Node with <i>undefined</i> namespace is serialized as having no prefix. In general, |
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* DOM API handles the complexity of namespace declaration handling and creates neccessary |
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* namespace declarations and undeclares default namespace. However, some node-creation methods (e.g. TXmlEngElement::AddNewElementL()) |
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* do not ensure that created node with undefined namespace (thus, without a prefix) will |
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* actually treated after serialization as having some <i>default</i> namespace |
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* |
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* @note |
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* Namespace nodes that are result of XPath expression have following restrictions: |
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* - they cannot be used as namespace definitions, because they are not part of |
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* the DOM tree, but copies of existing namespace definitions. |
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* - namespace prefix is not available because it is not mandated by DOM Level 3 XPath module API, |
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* so in returned copies of DOM tree, namespaces prefix strings are not preserved |
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* and Prefix() returns NULL. |
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* |
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* @lib XmlEngineDOM.lib |
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* @since S60 v3.1 |
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*/ |
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class TXmlEngNamespace: public TXmlEngNode |
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{ |
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public: |
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/** |
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* Default constructor |
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* |
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* @since S60 v3.1 |
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*/ |
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inline TXmlEngNamespace(); |
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/** |
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/** |
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* Get namespace URI |
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* |
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* @since S60 v3.1 |
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* @return Namespace URI string |
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* @note "" is never returned - it is replaced with NULL |
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* |
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* For TXmlEngNamespace(NULL) or namespace undeclaration (xmlns=""), which are |
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* treatet as <i>undefined namespace</i> returns NULL, |
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* otherwise result is not a NULL string and not a "" (empty string). |
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*/ |
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IMPORT_C TPtrC8 Uri() const; |
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/** |
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* Get namespace prefix. |
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* |
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* @since S60 v3.1 |
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* @return prefix that is bound in the namespace declaration |
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* or NULL string for default namespace or if no binding exist |
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*/ |
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IMPORT_C TPtrC8 Prefix() const; |
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/** |
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* Check if namespace is default. |
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* |
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* @since S60 v3.1 |
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* @return Whether it is a definition of default namespace |
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* TRUE -- is a default namespace (no prefix) |
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* FALSE -- not a default namespace (bound to prefix) or empty TXmlEngNamespace(NULL) instance |
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*/ |
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IMPORT_C TBool IsDefault() const; |
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|
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/** |
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* Check if namespace is undefined |
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* |
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* @since S60 v3.1 |
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* @return Whether the namespace is undefined |
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* |
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* A node's namespace is undefined if no namespace declaration associated with it. |
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* @note Same as TXmlEngNode::IsNull() |
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*/ |
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IMPORT_C TBool IsUndefined() const; |
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|
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protected: |
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/** |
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* Workaround to avoid misuse of TXmlEngNode::NamespaceUri() method, which should not be |
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* applied to TXmlEngNamespace node. Since the name of the inherited method from TXmlEngNode |
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* is too similar to TXmlEngNamespace::Uri(), NamespaceUri() is disabled for direct |
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* use. |
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* If NamespaceUri() is called on the TXmlEngNamespace object that is downcasted to TXmlEngNode, then |
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* NamespaceUri()'s result equals to result of Uri() method. |
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* |
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* @since S60 v3.1 |
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* @return NULL |
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*/ |
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inline TPtrC8 NamespaceUri(); |
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protected: |
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/** |
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* Constructor |
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* |
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* @since S60 v3.1 |
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* @param aPtr Namespace pointer |
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*/ |
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inline TXmlEngNamespace(void* aPtr); |
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friend class TXmlEngElement; |
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friend class TXmlEngNode; |
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}; |
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#include "xmlengnamespace.inl" |
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#endif /* XMLENGINE_NAMESPACE_H_INCLUDED */ |
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