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<h2 title="Class MultiSliceQueriesGroupingUtil" class="title">Class MultiSliceQueriesGroupingUtil</h2>
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<pre>public class <span class="typeNameLabel">MultiSliceQueriesGroupingUtil</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Utility class which helps to group necessary queries to matched vertices for the following multi-query execution.</div>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.DataTreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.DataTreeNode</a>&lt;<a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.DataTreeNode.html" title="type parameter in MultiSliceQueriesGroupingUtil.DataTreeNode">Q</a>&gt;</span></code>&nbsp;</td>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.TreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.TreeNode</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.html#MultiSliceQueriesGroupingUtil--">MultiSliceQueriesGroupingUtil</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static &lt;K&gt;&nbsp;void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.html#moveQueriesToNewLeafNode-java.util.List-K:A-org.janusgraph.graphdb.util.MultiSliceQueriesGroupingUtil.TreeNode-java.util.List-">moveQueriesToNewLeafNode</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.commons.lang3.tuple.Pair&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;K&gt;&gt;&gt;&nbsp;updatedQueryGroup,
                        K[]&nbsp;allVertices,
                        <a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.TreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.TreeNode</a>&nbsp;groupingRootTreeNode,
                        <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeysQueriesGroup.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeysQueriesGroup</a>&lt;K,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&gt;&nbsp;remainingQueryGroups)</code>
<div class="block">Moves queries `updatedQueryGroup` to either existing leaf nodes or generates new leaf nodes for the necessary key sets.</div>
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<td class="colFirst"><code>static &lt;C,N&gt;&nbsp;void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.html#replaceCurrentLeafNodeWithUpdatedTypeLeafNodes-java.util.List-java.util.Map-">replaceCurrentLeafNodeWithUpdatedTypeLeafNodes</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.TreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.TreeNode</a>&gt;&nbsp;allLeafParents,
                                              <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;C,N&gt;&nbsp;oldToNewKeysMap)</code>
<div class="block">Replaces child leaf nodes which have data <code>KeysQueriesGroup&lt;C&gt;</code> with new leaf nodes which have keys replaces
 by `oldToNewKeysMap`.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiKeysQueryGroups.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiKeysQueryGroups</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.html#toMultiKeysQueryGroups-java.util.Collection-java.util.List-">toMultiKeysQueryGroups</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/janusgraph/graphdb/internal/InternalVertex.html" title="interface in org.janusgraph.graphdb.internal">InternalVertex</a>&gt;&nbsp;vertices,
                      <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/graphdb/query/BackendQueryHolder.html" title="class in org.janusgraph.graphdb.query">BackendQueryHolder</a>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&gt;&nbsp;queries)</code>
<div class="block">Queries grouping algorithm for the same sets of keys (vertices).</div>
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<h4>MultiSliceQueriesGroupingUtil</h4>
<pre>public&nbsp;MultiSliceQueriesGroupingUtil()</pre>
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<a name="moveQueriesToNewLeafNode-java.util.List-java.lang.Object:A-org.janusgraph.graphdb.util.MultiSliceQueriesGroupingUtil.TreeNode-java.util.List-">
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<h4>moveQueriesToNewLeafNode</h4>
<pre>public static&nbsp;&lt;K&gt;&nbsp;void&nbsp;moveQueriesToNewLeafNode(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;org.apache.commons.lang3.tuple.Pair&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;K&gt;&gt;&gt;&nbsp;updatedQueryGroup,
                                                K[]&nbsp;allVertices,
                                                <a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.TreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.TreeNode</a>&nbsp;groupingRootTreeNode,
                                                <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeysQueriesGroup.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeysQueriesGroup</a>&lt;K,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&gt;&nbsp;remainingQueryGroups)</pre>
<div class="block">Moves queries `updatedQueryGroup` to either existing leaf nodes or generates new leaf nodes for the necessary key sets.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>updatedQueryGroup</code> - Query groups to which a query should be moved.</dd>
<dd><code>allVertices</code> - All vertices</dd>
<dd><code>groupingRootTreeNode</code> - Root tree node which represents chains where each left node represents a missing key
                             from `allVertices` array, and each right node represents existing key from `allVertices`
                             array.</dd>
<dd><code>remainingQueryGroups</code> - Remaining groups where queries from `updatedQueryGroup` should be added. Notice, if
                             a new leaf node is added into `groupingRootTreeNode` then a new group is added to
                             `remainingQueryGroups`.</dd>
</dl>
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<h4>replaceCurrentLeafNodeWithUpdatedTypeLeafNodes</h4>
<pre>public static&nbsp;&lt;C,N&gt;&nbsp;void&nbsp;replaceCurrentLeafNodeWithUpdatedTypeLeafNodes(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/graphdb/util/MultiSliceQueriesGroupingUtil.TreeNode.html" title="class in org.janusgraph.graphdb.util">MultiSliceQueriesGroupingUtil.TreeNode</a>&gt;&nbsp;allLeafParents,
                                                                        <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;C,N&gt;&nbsp;oldToNewKeysMap)</pre>
<div class="block">Replaces child leaf nodes which have data <code>KeysQueriesGroup&lt;C&gt;</code> with new leaf nodes which have keys replaces
 by `oldToNewKeysMap`. The resulting data of child nodes will be <code>KeysQueriesGroup&lt;N&gt;</code>.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>C</code> - current key type</dd>
<dd><code>N</code> - new key type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>allLeafParents</code> - parent nodes</dd>
<dd><code>oldToNewKeysMap</code> - map to replace old type keys with new type keys</dd>
</dl>
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<h4>toMultiKeysQueryGroups</h4>
<pre>public static&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiKeysQueryGroups.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiKeysQueryGroups</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&nbsp;toMultiKeysQueryGroups(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../org/janusgraph/graphdb/internal/InternalVertex.html" title="interface in org.janusgraph.graphdb.internal">InternalVertex</a>&gt;&nbsp;vertices,
                                                                             <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/janusgraph/graphdb/query/BackendQueryHolder.html" title="class in org.janusgraph.graphdb.query">BackendQueryHolder</a>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&gt;&nbsp;queries)</pre>
<div class="block">Queries grouping algorithm for the same sets of keys (vertices).
 <br>
 This algorithm uses a binary prefix tree to find a group with the same vertices (same vertices Set).
 All and only the leaf nodes store the final computed data (queries used for this leaf node + vertices used for this leaf nodes).
 Each leaf node represents a group of queries which always have the same vertices.
 Time complexity is always O(N+M), where N is the vertices amount and M is the queries amount.
 Space complexity in most cases is O(N+M), or O(N*M) in the worst case.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vertices</code> - all vertices.</dd>
<dd><code>queries</code> - all queries which should be executed for all vertices.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Generated grouped multi-query representation.</dd>
</dl>
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