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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/MDA" style="color: #3b73af; text-decoration: none">Metadata Aggregator</a> / <a href="https://issues.shibboleth.net/jira/browse/MDA-237" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-07504977-45c5-45e8-9c85-a22148f5e107" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://issues.shibboleth.net/jira/browse/MDA-237" style="color: #3b73af; text-decoration: none">MDA-237</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/MDA-237" style="color: #3b73af; text-decoration: none">Refactor BaseIteratingStage, add predicate-based execution</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-07504977-45c5-45e8-9c85-a22148f5e107" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 0.9.2 </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#0052cc;; color: #3b73af; text-decoration: none">Ian Young</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Pipeline </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 17/Feb/20 12:01 PM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Fix Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 0.10.0 </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-f1b984f2-7f8a-4d0c-9c7a-bd3d7fdcd986" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ian@iay.org.uk" id="email_ian@iay.org.uk" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=ian%40iay.org.uk" style="color:#0052cc;; color: #3b73af; text-decoration: none">Ian Young</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">The current BaseIteratingStage is a bit strange: it iterates across the collection of items, applying the template execution method to each one and <em>then optionally removes items from the collection</em>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">There are very few (ultimate) subclasses which don't fall into one of the two patterns:</p>
<ul>
<li>Iterating: Execute some function on each item, or</li>
<li>Filtering: Look at each item, and remove items if some condition is true.</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We should refactor this so that those two cases have independent base classes.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This would also allow us to add a template method to the pure iterating case to say whether the item is appropriate to have the execution method applied to it. This could be used in the abstract class for iterations to allow a <tt>Predicate<Item<T>></tt> to be plugged in to determinate this: this would allow much simpler conditional execution on the basis of, say, <tt>ItemID</tt> item metadata than is possible at present.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">There are a couple of stages which don't fall into this new bifurcation: for example, there's a SAML-specific stage that works with an item which may have EntitiesDescriptor elements, removing those elements <em>or the entire item</em> as appropriate. I don't think I'd have written that to start with (I think it would be better to smash down to individual items for each entity, then filter the individual entities) and might want to deprecate it at some point, but we might need to keep the current BaseIteratingStage around to support that kind of use case.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So, two options: add a new BaseExecutingStage and keep BaseIteratingStage but maybe deprecate it, or use BaseIteratingStage for the plain iterating case. In each case, add a BaseFilteringStage with the filtering pattern as well and migrate <em>our</em> filtering stages across to that.</p> </td>
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