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von raredesign | Dez 3, 2019 | Allgemein | 0 Kommentare
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<div id="projectname">CLAM-Development
 <span id="projectnumber">1.4.0</span>
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<div class="title">Dumping and Restoring objects on XML</div> </div>
<div class="ingroups"><a class="el" href="group__Xml.html">XML</a></div></div><!--header-->
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<p>How to dump or restore a <a class="el" href="classCLAM_1_1Component.html" title="Abstract class for objects that can have subitems to be stored on a storage.">CLAM::Component</a> in XML format.
<a href="#details">More...</a></p>
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<tr class="heading"><td colspan="2"><h2><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classCLAM_1_1XmlStorage.html">CLAM::XmlStorage</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Provides XML format storage for <a class="el" href="namespaceCLAM.html">CLAM</a> <a class="el" href="classCLAM_1_1Component.html" title="Abstract class for objects that can have subitems to be stored on a storage.">Component</a>'s. <a href="classCLAM_1_1XmlStorage.html#details">More...</a><br/></td></tr>
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<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<p>How to dump or restore a <a class="el" href="classCLAM_1_1Component.html" title="Abstract class for objects that can have subitems to be stored on a storage.">CLAM::Component</a> in XML format. </p>
<p>Any class that derives from Component can be dumped and restored in XML (<a href="http://www.w3.org/XML">http://www.w3.org/XML</a>) format. Components includes Arrays, DynamicType, ProcessingConfig, ProcessingData...</p>
<dl class="section warning"><dt>Warning:</dt><dd>XML storage is a very expensive task when dealing with big amounts of numeric data.</dd></dl>
<h1><a class="anchor" id="XMLStaticInterface"></a>
Dumping and restoring a component in XML</h1>
<p>In its simplest usage, you can use the static functions Dump and Restore. </p>
<div class="fragment"><div class="line"> MyComponent myComponent;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Here you can modify your Component</span></div>
<div class="line"></div>
<div class="line"> <a class="code" href="classCLAM_1_1XmlStorage.html#a67bcef33fd2382092c34148012444798" title="Dumps a Component as XML onto the named file with name as the root element.">CLAM::XmlStorage::Dump</a>(myComponent, <span class="stringliteral">"Document"</span>, <span class="stringliteral">"MyComponent.xml"</span>)</div>
</div><!-- fragment --><p>Later you can restore the component: </p>
<div class="fragment"><div class="line"> <span class="comment">// An unmodified default constructed object!!!</span></div>
<div class="line"> MyComponent comp;</div>
<div class="line"> <span class="keywordflow">try</span></div>
<div class="line"> {</div>
<div class="line"> <a class="code" href="classCLAM_1_1XmlStorage.html#a15974b87a288e26476ae0a40845ad1b4" title="Restore a Component from the given istream.">CLAM::XmlStorage::Restore</a>(comp, <span class="stringliteral">"mycomponent.xml"</span>);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">catch</span> (<a class="code" href="classCLAM_1_1XmlStorageErr.html">CLAM::XmlStorageErr</a> & err)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Handle the error, a dirty way could be:</span></div>
<div class="line"> std::cerr << err.<a class="code" href="classCLAM_1_1XmlStorageErr.html#ae0a37ceefcf581556c9aef4a977d777f">what</a>() << std::endl;</div>
<div class="line"> exit(-1);</div>
<div class="line"> }</div>
</div><!-- fragment --><p>Dump and Restore are overloaded to accept any C++ stream instead of a filename. So, you can also write: </p>
<div class="fragment"><div class="line"> MyComponent myComponent;</div>
<div class="line"> <a class="code" href="classCLAM_1_1XmlStorage.html#a67bcef33fd2382092c34148012444798" title="Dumps a Component as XML onto the named file with name as the root element.">CLAM::XmlStorage::Dump</a>(myComponent, <span class="stringliteral">"Document"</span>, std::cout)</div>
</div><!-- fragment --><p>You can the AppendToDocument static function to add an object in a given path of an existing XML file, or using RestoreFromFragment to restore the object taking an XML fragment.</p>
<p>Catchable exceptions (<a class="el" href="classCLAM_1_1XmlStorageErr.html">CLAM::XmlStorageErr</a>) are thrown on the following conditions:</p>
<ul>
<li>The source/target stream could not be open</li>
<li>The read source contained illegal XML</li>
<li>The XML is valid but it failed to be mapped to the <a class="el" href="namespaceCLAM.html">CLAM</a> objects.</li>
<li>A step on the path to change the selection couldn't be followed</li>
<li>A loaded <a class="el" href="namespaceCLAM.html">CLAM</a> object failed its own activation constraints.</li>
</ul>
<dl class="section author"><dt>Author:</dt><dd>David Garcia. </dd></dl>
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