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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.iceberg.expressions</a></div> |
| <h2 title="Class ExpressionVisitors" class="title">Class ExpressionVisitors</h2> |
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| <li>java.lang.Object</li> |
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| <pre>public class <span class="typeNameLabel">ExpressionVisitors</span> |
| extends java.lang.Object</pre> |
| <div class="block">Utils for traversing <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expressions</code></a>.</div> |
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| <h3>Nested Class Summary</h3> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ExpressionVisitors.BoundExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.BoundExpressionVisitor</a><<a href="ExpressionVisitors.BoundExpressionVisitor.html" title="type parameter in ExpressionVisitors.BoundExpressionVisitor">R</a>></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ExpressionVisitors.BoundVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.BoundVisitor</a><<a href="ExpressionVisitors.BoundVisitor.html" title="type parameter in ExpressionVisitors.BoundVisitor">R</a>></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.CustomOrderExpressionVisitor</a><<a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="type parameter in ExpressionVisitors.CustomOrderExpressionVisitor">R</a>></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.ExpressionVisitor</a><<a href="ExpressionVisitors.ExpressionVisitor.html" title="type parameter in ExpressionVisitors.ExpressionVisitor">R</a>></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <R> R</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.CustomOrderExpressionVisitor)">visit</a></span>​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.CustomOrderExpressionVisitor</a><R> visitor)</code></th> |
| <td class="colLast"> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <R> R</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visit(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor)">visit</a></span>​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.ExpressionVisitor</a><R> visitor)</code></th> |
| <td class="colLast"> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static java.lang.Boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#visitEvaluator(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor)">visitEvaluator</a></span>​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.ExpressionVisitor</a><java.lang.Boolean> visitor)</code></th> |
| <td class="colLast"> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>.</div> |
| </td> |
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| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
| <a id="visit(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor)"> |
| <!-- --> |
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| <h4>visit</h4> |
| <pre class="methodSignature">public static <R> R visit​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.ExpressionVisitor</a><R> visitor)</pre> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>. |
| |
| <p>The visitor will be called to handle each node in the expression tree in postfix order. |
| Result values produced by child nodes are passed when parent nodes are handled.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>R</code> - the return type produced by the expression visitor</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expr</code> - an expression to traverse</dd> |
| <dd><code>visitor</code> - a visitor that will be called to handle each node in the expression tree</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the value returned by the visitor for the root expression node</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="visitEvaluator(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>visitEvaluator</h4> |
| <pre class="methodSignature">public static java.lang.Boolean visitEvaluator​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.ExpressionVisitor</a><java.lang.Boolean> visitor)</pre> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.ExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>. |
| |
| <p>The visitor will be called to handle only nodes required for determining result in the |
| expression tree in postfix order. Result values produced by child nodes are passed when parent |
| nodes are handled.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expr</code> - an expression to traverse</dd> |
| <dd><code>visitor</code> - a visitor that will be called to handle each node in the expression tree</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the value returned by the visitor for the root expression node</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="visit(org.apache.iceberg.expressions.Expression,org.apache.iceberg.expressions.ExpressionVisitors.CustomOrderExpressionVisitor)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>visit</h4> |
| <pre class="methodSignature">public static <R> R visit​(<a href="Expression.html" title="interface in org.apache.iceberg.expressions">Expression</a> expr, |
| <a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions">ExpressionVisitors.CustomOrderExpressionVisitor</a><R> visitor)</pre> |
| <div class="block">Traverses the given <a href="Expression.html" title="interface in org.apache.iceberg.expressions"><code>expression</code></a> with a <a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a>. |
| |
| <p>This passes a <code>Supplier</code> to each non-leaf <a href="ExpressionVisitors.CustomOrderExpressionVisitor.html" title="class in org.apache.iceberg.expressions"><code>visitor</code></a> |
| method. The supplier returns the result of traversing child expressions. Getting the result of |
| the supplier allows traversing the expression in the desired order.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>R</code> - the return type produced by the expression visitor</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expr</code> - an expression to traverse</dd> |
| <dd><code>visitor</code> - a visitor that will be called to handle each node in the expression tree</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the value returned by the visitor for the root expression node</dd> |
| </dl> |
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