author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 11 Mar 2010 15:24:26 +0000 | |
changeset 2 | ebc84c812384 |
parent 0 | 89d6a7a84779 |
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept xml:lang="en" id="GUID-AF937B6E-7BC0-5B7D-818E-93F7CAFD8808"><title>Parsing an XML document using Content Handler</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This section explains how to parse an XML document by implementing the content handler functionality of the parser framework. </p> <p> <xref href="GUID-A6B8386B-29F6-3BEC-9D77-D8E0900DEAC2.dita"><apiname>MContentHandler</apiname></xref> class defines the interface required by a client of the XML framework. It allows a client to be placed in a chain with other clients such as a Parser or a Validator, and therefore allows the flow of information within chain. It provides callbacks similar to that of the SAX 2.0 interface. </p> <section><title>Introduction</title> <p>Consider a scenario when an application with numerous settings require the settings being saved, so that when the application is restarted after a shutdown, the settings are available. This can be achieved (while ensuring the cross-platform compatibility) by saving the setting in an XML file, which the application parses on start-up. The application responds to the XML statements by implementing the <xref href="GUID-A6B8386B-29F6-3BEC-9D77-D8E0900DEAC2.dita"><apiname>MContentHandler</apiname></xref> interface. Since the parser detects tags and their content, it calls the associated content handler functions to respond with the required behaviour. </p> <p>The callback functions which an implementation of <xref href="GUID-A6B8386B-29F6-3BEC-9D77-D8E0900DEAC2.dita"><apiname>MContentHandler</apiname></xref> must provide are depicted in the table. These correspond to functions defined in the <codeph>ContentHandler</codeph> interface of the <xref scope="external" href="http://www.saxproject.org">SAX specification</xref>. The last parameter of each function is an error code. If no error has taken place, then the <xref href="GUID-6CA4F1ED-7947-3087-B618-D35858FAA3BC.dita"><apiname>KErrNone</apiname></xref> null error code is returned by the framework. </p> <p> </p> <table id="GUID-BF14F3DB-7880-5299-874C-3B56554C8080"><tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/><thead><row><entry>MContentHandler callback</entry> <entry>SAX specification function</entry> </row> </thead> <tbody><row><entry><p> <xref href="GUID-6F240EEF-81FA-3A27-9593-A7ADC9118627.dita"><apiname>OnStartDocumentL()</apiname></xref> </p> </entry> <entry><p> <codeph>startDocument() </codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-81F0FD8C-825D-3283-B998-6B44CC3294FE.dita"><apiname>OnEndDocumentL()</apiname></xref> </p> </entry> <entry><p> <codeph>endDocument() </codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-5BFFB049-5C71-31FB-ADBE-89FF4296E125.dita"><apiname>OnStartElementL()</apiname></xref> </p> </entry> <entry><p> <codeph>startElement()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-6F1E258D-CE57-3C22-BBDE-AF5B6D6C90EB.dita"><apiname>OnEndElementL()</apiname></xref> </p> </entry> <entry><p> <codeph>endElement() </codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-37601F09-7C8A-3397-8750-92CE95C1B87B.dita"><apiname>OnContentL()</apiname></xref> </p> </entry> <entry><p> <codeph>characters()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-DA03C829-A9E3-3A8E-9367-208545FA0721.dita"><apiname>OnStartPrefixMappingL()</apiname></xref> </p> </entry> <entry><p> <codeph>startPrefixMapping()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-CC4C2F12-DC24-3F7F-BB5F-7D744F41E095.dita"><apiname>OnEndPrefixMappingL()</apiname></xref> </p> </entry> <entry><p> <codeph> endPrefixMapping()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-92826CB4-B56E-3E9F-BD4B-31ADE3974D91.dita"><apiname>OnIgnorableWhiteSpaceL()</apiname></xref> </p> </entry> <entry><p> <codeph> ignorableWhitespace()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-3D25881F-192F-3A21-B3DE-ECAB29C1D5CA.dita"><apiname>OnSkippedEntityL()</apiname></xref> </p> </entry> <entry><p> <codeph>skippedEntity()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-7DAF7316-BD31-3AD4-9854-F8CB6319D3D4.dita"><apiname>OnProcessingInstructionL()</apiname></xref> </p> </entry> <entry><p> <codeph>processingInstruction()</codeph> </p> </entry> </row> <row><entry><p> <xref href="GUID-BF4510DE-7C8B-3404-91C0-FAC737AA1A07.dita"><apiname>OnError()</apiname></xref> </p> </entry> <entry><p> </p> </entry> </row> <row><entry><p> <xref href="GUID-A03D96B2-56B2-33A7-AC51-E1F5D1CA681C.dita"><apiname>GetExtendedInterface()</apiname></xref> </p> </entry> <entry><p> </p> </entry> </row> </tbody> </tgroup> </table> <p>The following table lists the classes that are parameter of functions that must be implemented: </p> <table id="GUID-B34320E0-B8B1-5992-94AE-DA6D587D84F1"><tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/><thead><row><entry>Class</entry> <entry>Description</entry> </row> </thead> <tbody><row><entry><p> <xref href="GUID-D79A2F59-8DC1-3493-92F6-2E1337CD9405.dita"><apiname>RDocumentParameters</apiname></xref> </p> </entry> <entry><p>Contains the character set which the document uses. </p> </entry> </row> <row><entry><p> <xref href="GUID-58047BD6-FECF-3BF0-869B-65F833D972A4.dita"><apiname>RAttributeArray</apiname></xref> </p> </entry> <entry><p>Consists of an array of <xref href="GUID-BAD00F6C-6E5C-3331-BA58-85A186F933E8.dita"><apiname>RAttribute</apiname></xref> objects. The array holds the name (as an <xref href="GUID-6CEDFB6D-16B6-3860-922B-15A23C182DB2.dita"><apiname>RTagInfo</apiname></xref> object), value and type of each attribute of the element. </p> </entry> </row> <row><entry><p> <xref href="GUID-6CEDFB6D-16B6-3860-922B-15A23C182DB2.dita"><apiname>RTagInfo</apiname></xref> </p> </entry> <entry><p>Contains information about an XML tag, its namespace URI and prefix, and its local name. </p> </entry> </row> </tbody> </tgroup> </table> </section> <section id="GUID-948C5BEE-0E05-525A-B601-909A1818FDA0"><title>Procedure</title> <p>Follow the steps given below to understand how to parse an XML document by implementing the content handler functionality: </p> <ol id="GUID-9404AB58-0C3C-5CE9-A4BE-D15861B145E8"><li id="GUID-D4F71FA7-3DC7-5CB7-89D6-459E4F35D43E"><p>Implement the <codeph>MContentHandler</codeph> interface. </p> <p>The following code snippet illustrates how to implement <codeph>MContentHandler</codeph>: </p> <codeblock id="GUID-DE2A07E6-00BD-577D-AF67-83B85CD59572" xml:space="preserve">class CMyContentHandler : public CBase, public MContentHandler |
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{ |
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public: |
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// A callback to indicate the start of the document. |
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void CXmlExample::OnStartDocumentL( const RDocumentParameters&, TInt ) |
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{ |
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iConsole->Printf( KOnStartDoc ); |
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iConsole->Printf( KPressAKey ); |
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iConsole->Getch(); |
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iNumElements = 0; |
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iNumSkippedEntities = 0; |
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iNumPrefixMappings = 0; |
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iNumPrefixUnmappings = 0; |
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} |
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// A callback to indicate an element has been parsed. |
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void CXmlExample::OnStartElementL( const RTagInfo&, const RAttributeArray&, TInt ) |
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{ |
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iConsole->Printf( KOnStartEle ); |
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if( iLeaveOnStartElement ) |
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{ |
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if( iNumElements++ == 0 ) |
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{ |
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iConsole->Printf( KOnStartErr, KExpectedLeaveCode ); |
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User::After( 1 ); |
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User::Leave( KExpectedLeaveCode ); |
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} |
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iNumElements++; |
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} |
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} |
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// implementations of the other callbacks |
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// ... |
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}</codeblock> </li> <li id="GUID-A6BB0985-37A3-526D-B678-266A55F57862"><p>Instantiate the <codeph>ContentHandler</codeph> object in the client application code and pass it to the constructor method of a parser object. </p> <codeblock id="GUID-14F1FCEB-7475-583B-867A-E7D19E8369B0" xml:space="preserve">... |
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CMyContentHandler* ch = CMyContentHandler::NewL(); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
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changeset
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CParser* parser = CParser::NewLC( KXmlMimeType,ch ); |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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52 |
parser->ParseL( myXMLdata ); // this will result in callbacks to ch |
89d6a7a84779
Initial contribution of Documentation_content according to Feature bug 1266 bug 1268 bug 1269 bug 1270 bug 1372 bug 1374 bug 1375 bug 1379 bug 1380 bug 1381 bug 1382 bug 1383 bug 1385
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
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53 |
...</codeblock> </li> </ol> </section> </conbody></concept> |