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| <h1 id="Lucene_Net_Expressions" data-uid="Lucene.Net.Expressions" class="text-break">Namespace Lucene.Net.Expressions |
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| <h1 id="expressions">expressions</h1> |
| <p> <a class="xref" href="Lucene.Net.Expressions.Expression.html">Expression</a> - result of compiling an expression, which can evaluate it for a given document. Each expression can have external variables are resolved by {@code Bindings}. </p> |
| <p> <a class="xref" href="Lucene.Net.Expressions.Bindings.html">Bindings</a> - abstraction for binding external variables to a way to get a value for those variables for a particular document (ValueSource). </p> |
| <p> <a class="xref" href="Lucene.Net.Expressions.SimpleBindings.html">SimpleBindings</a> - default implementation of bindings which provide easy ways to bind sort fields and other expressions to external variables </p> |
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| <h3 id="classes">Classes |
| </h3> |
| <h4><a class="xref" href="Lucene.Net.Expressions.Bindings.html">Bindings</a></h4> |
| <section><p>Binds variable names in expressions to actual data.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Expressions.Expression.html">Expression</a></h4> |
| <section><p>Base class that computes the value of an expression for a document.</p> |
| </section> |
| <h4><a class="xref" href="Lucene.Net.Expressions.SimpleBindings.html">SimpleBindings</a></h4> |
| <section><p>Simple class that binds expression variable names to |
| <span class="xref">Lucene.Net.Search.SortField</span>s or other |
| <a class="xref" href="Lucene.Net.Expressions.Expression.html">Expression</a>s. |
| <p> |
| Example usage:</p> |
| <pre><code>SimpleBindings bindings = new SimpleBindings(); |
| // document's text relevance score |
| bindings.Add(new SortField("_score", SortFieldType.SCORE)); |
| // integer NumericDocValues field (or from FieldCache) |
| bindings.Add(new SortField("popularity", SortFieldType.INT)); |
| // another expression |
| bindings.Add("recency", myRecencyExpression); |
| // create a sort field in reverse order |
| Sort sort = new Sort(expr.GetSortField(bindings, true));</code></pre> |
| <div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></section> |
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