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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I was thinking more about this and I think there are several possibilities if you want to completely repopulate a layer (or other object) from a string. Personally,
I’d leave the updateFromString() method alone and add a reset/init or whatever method that basically free’s the object and then re-initializes it resulting in an object that is ready to load a definition into. For a layer that would clear out projections,
classes, etc…, for a class that would clear out styles, and so on… Code would look something like:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> $layer = $map->getLayerByName(‘foo’);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> $layer->reset();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> $layer->updateFromString($fullLayerDefinitionString);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">One could also add new method to explicitly do the reset and update (e.g. resetFromString) or perhaps add a flag to the updateFromString method to reset.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> mapserver-dev [mailto:mapserver-dev-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Lime, Steve D (MNIT)<br>
<b>Sent:</b> Monday, October 09, 2017 11:12 AM<br>
<b>To:</b> Tamas Szekeres <szekerest@gmail.com><br>
<b>Cc:</b> mapserver-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [mapserver-dev] Using updateFromString on existing items<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I think we need to spend a little time looking at the code and the original RFC to properly document the “as is” behavior and then determine if any changes are
necessary. Looking at the layer code I think my reference to “minor edits” is wrong. If you update a layer from a string in MapScript and that string contains classes then *<b>new</b>* classes are added to the layer object. If you want to update an existing
class you’d have to update it directly from a string, not via the parent layer. Resetting the object would be a pretty drastic change. It may be that only projections need some sort of intervention to clear things out…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Tamas Szekeres [<a href="mailto:szekerest@gmail.com">mailto:szekerest@gmail.com</a>]
<br>
<b>Sent:</b> Monday, October 09, 2017 10:18 AM<br>
<b>To:</b> Lime, Steve D (MNIT) <<a href="mailto:steve.lime@state.mn.us">steve.lime@state.mn.us</a>><br>
<b>Cc:</b> <a href="mailto:mapserver-dev@lists.osgeo.org">mapserver-dev@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [mapserver-dev] Using updateFromString on existing items<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Steve,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It is hard to interpret what are the allowed "minor edits" in such case. Neither the documentation or the corresponting rfc provides any guidance.<o:p></o:p></p>
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<p class="MsoNormal">One can think a reasonable use case to completely deserialize the object state by using these methods.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Do we have a simple approach to reset the state of the object (as it was newly created) before calling the updateFromString method?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Tamas<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2017-10-09 16:23 GMT+02:00 Lime, Steve D (MNIT) <<a href="mailto:steve.lime@state.mn.us" target="_blank">steve.lime@state.mn.us</a>>:<o:p></o:p></p>
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<p style="margin-bottom:12.0pt"><span style="font-family:"Calibri",sans-serif;color:black">The original use case was to facilitate minor edits to existing object properties but not sub-objects. For example, you can't replace all the classes in a layer through
a string update to the layer itself. We certainly could make all that work cleaner if there were demand.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">At least you get a proper error message... ;-)<o:p></o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p><span style="font-family:"Calibri",sans-serif;color:black">Steve<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> mapserver-dev <<a href="mailto:mapserver-dev-bounces@lists.osgeo.org" target="_blank">mapserver-dev-bounces@lists.osgeo.org</a>>
on behalf of Tamas Szekeres <<a href="mailto:szekerest@gmail.com" target="_blank">szekerest@gmail.com</a>><br>
<b>Sent:</b> Sunday, October 8, 2017 12:49:55 PM<br>
<b>To:</b> <a href="mailto:mapserver-dev@lists.osgeo.org" target="_blank">mapserver-dev@lists.osgeo.org</a><br>
<b>Subject:</b> [mapserver-dev] Using updateFromString on existing items</span> <o:p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Hi Devs, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is that a supported use case to apply updateFromString on an existing item or it should only be used only on a newly created item?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">For example when I use layerObj.updateFromString on an existing layer I get the following error<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas;color:black">loadProjection(): General error message. Projection is already initialized. Multiple projection definitions are not allowed in this object. (line 10)</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is because we don't have a proper cleanup code on the existing layer before calling loadLayer on it. The same applies to the other object types.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<br>
<br>
Tamas<o:p></o:p></p>
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