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<div class="subTitle">org.janusgraph.graphdb.query</div> |
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<h2 title="Class QueryProcessor" class="title">Class QueryProcessor<Q extends <a href="../../../../org/janusgraph/graphdb/query/ElementQuery.html" title="interface in org.janusgraph.graphdb.query">ElementQuery</a><R,B>,R extends <a href="../../../../org/janusgraph/core/JanusGraphElement.html" title="interface in org.janusgraph.core">JanusGraphElement</a>,B extends <a href="../../../../org/janusgraph/graphdb/query/BackendQuery.html" title="interface in org.janusgraph.graphdb.query">BackendQuery</a><B>></h2> |
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<li>org.janusgraph.graphdb.query.QueryProcessor<Q,R,B></li> |
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<dt>All Implemented Interfaces:</dt> |
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<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><R></dd> |
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<pre>public class <span class="typeNameLabel">QueryProcessor<Q extends <a href="../../../../org/janusgraph/graphdb/query/ElementQuery.html" title="interface in org.janusgraph.graphdb.query">ElementQuery</a><R,B>,R extends <a href="../../../../org/janusgraph/core/JanusGraphElement.html" title="interface in org.janusgraph.core">JanusGraphElement</a>,B extends <a href="../../../../org/janusgraph/graphdb/query/BackendQuery.html" title="interface in org.janusgraph.graphdb.query">BackendQuery</a><B>></span> |
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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> |
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implements <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><R></pre> |
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<div class="block">Executes a given <a href="../../../../org/janusgraph/graphdb/query/ElementQuery.html" title="interface in org.janusgraph.graphdb.query"><code>ElementQuery</code></a> against a provided <a href="../../../../org/janusgraph/graphdb/query/QueryExecutor.html" title="interface in org.janusgraph.graphdb.query"><code>QueryExecutor</code></a> to produce the result set of elements. |
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<p> |
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The QueryProcessor creates a number of stacked iterators. <br> |
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At the highest level, the OuterIterator ensures that the correct (up to the given limit) number of elements is returned. It also provides the implementation of remove() |
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by calling the element's remove() method. <br> |
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The OuterIterator wraps the "unfolded" iterator which is a combination of the individual result set iterators of the sub-queries of the given query (see <a href="../../../../org/janusgraph/graphdb/query/ElementQuery.html#getSubQuery-int-"><code>ElementQuery.getSubQuery(int)</code></a>. |
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The unfolded iterator combines this iterators by checking whether 1) the result sets need additional filtering (if so, a filter iterator is wrapped around it) and 2) whether |
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the final result set needs to be sorted and in what order. If the result set needs to be sorted and the individual sub-query result sets aren't, then a PreSortingIterator is wrapped around |
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the iterator which effectively iterates the result set out, sorts it and then returns an iterator (i.e. much more expensive than exploiting existing sort orders).<br> |
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In this way, the individual sub-result sets are prepared and then merged together the MergeSortIterator (which conserves sort order if present). |
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The semantics of the queries is OR, meaning the result sets are combined. |
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However, when <a href="../../../../org/janusgraph/graphdb/query/ElementQuery.html#hasDuplicateResults--"><code>ElementQuery.hasDuplicateResults()</code></a> is true (which assumes that the result set is sorted) then the merge sort iterator |
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filters out immediate duplicates.</div> |
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<dl> |
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<dt><span class="simpleTagLabel">Author:</span></dt> |
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<dd>Matthias Broecheler (me@matthiasb.com)</dd> |
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html#QueryProcessor-Q-org.janusgraph.graphdb.query.QueryExecutor-">QueryProcessor</a></span>(<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">Q</a> query, |
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<a href="../../../../org/janusgraph/graphdb/query/QueryExecutor.html" title="interface in org.janusgraph.graphdb.query">QueryExecutor</a><<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">Q</a>,<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">R</a>,<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">B</a>> executor)</code> </td> |
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<td class="colFirst"><code>org.apache.tinkerpop.gremlin.structure.util.CloseableIterator<<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">R</a>></code></td> |
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html#iterator--">iterator</a></span>()</code> </td> |
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li> |
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<a name="QueryProcessor-org.janusgraph.graphdb.query.ElementQuery-org.janusgraph.graphdb.query.QueryExecutor-"> |
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<h4>QueryProcessor</h4> |
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<pre>public QueryProcessor(<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">Q</a> query, |
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<a href="../../../../org/janusgraph/graphdb/query/QueryExecutor.html" title="interface in org.janusgraph.graphdb.query">QueryExecutor</a><<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">Q</a>,<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">R</a>,<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">B</a>> executor)</pre> |
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<h4>iterator</h4> |
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<pre>public org.apache.tinkerpop.gremlin.structure.util.CloseableIterator<<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">R</a>> iterator()</pre> |
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<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#iterator--" title="class or interface in java.lang">iterator</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<a href="../../../../org/janusgraph/graphdb/query/QueryProcessor.html" title="type parameter in QueryProcessor">R</a> extends <a href="../../../../org/janusgraph/core/JanusGraphElement.html" title="interface in org.janusgraph.core">JanusGraphElement</a>></code></dd> |
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