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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HV" style="color: #3b73af; text-decoration: none">Hibernate Validator</a> / <a href="https://hibernate.atlassian.net/browse/HV-1193" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-b40a6fb6-16dc-4cb7-82ef-2e7c2f124a39" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HV-1193" style="color: #3b73af; text-decoration: none">HV-1193</a> </td>
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<td style="vertical-align: top;; padding: 0; 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://hibernate.atlassian.net/browse/HV-1193" style="color: #3b73af; text-decoration: none">Avoid systematic resizing of collections when using CollectionHelper with a size</a> </span> </td>
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<td class="has-icon" style="padding: 0; 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-b40a6fb6-16dc-4cb7-82ef-2e7c2f124a39" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gsmet" id="email_gsmet" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gsmet" style="color:#6c797f;; color: #3b73af; text-decoration: none">Guillaume Smet</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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 23/Dec/2016 04:51 AM </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 6.0-next </td>
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<td class="has-icon" style="padding: 0; 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-trivial-98f1a50f-21ae-43b4-8380-07ffe768d259" height="16" width="16" border="0" align="absmiddle" alt="Trivial" style="vertical-align: text-bottom"> Trivial </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="gsmet" id="email_gsmet" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gsmet" style="color:#6c797f;; color: #3b73af; text-decoration: none">Guillaume Smet</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">In Validator, we usually use CollectionHelper.newHashMap(int initialCapacity) to avoid the resizing of the HashMap after its initialization.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The issue is that it's doing more harm than good because the default load factor is of 0.75 so the initial size of the map is always smaller than what we expect and it's always resized.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We should rename the parameter to expectedSize instead of initialCapacity and calculate the size taking into account the default load factor.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Typically, we use the following pattern to initialize a correctly sized Map:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Given a List<<span class="code-object" style="color: #910091">String</span>> myList, we create the Map with:
Map<<span class="code-object" style="color: #910091">String</span>, <span class="code-object" style="color: #910091">Object</span>> myMap = CollectionHelper.newHashMap( myList.size() );
<span class="code-keyword" style="color: #000091">for</span> ( <span class="code-object" style="color: #910091">String</span> element : myList ) {
myMap.put( element, object );
}
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Currently the Map is created with an initial capacity of <tt>myList.size()</tt> but as the load factor is of 0.75, when we try to put <tt>myList.size()</tt> elements in it, it is systematically resized. This is totally counter productive as the purpose was to avoid the resizing of the Map.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Same for {{Set}}s and {{List}}s.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">See for instance <tt>Lists.newArrayListWithExpectedSize</tt> of Guava.</p> </td>
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