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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.linq4j</a></div> |
| <h2 title="Class CartesianProductEnumerator" class="title">Class CartesianProductEnumerator<T,​E></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.linq4j.CartesianProductEnumerator<T,​E></li> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Input element type</dd> |
| <dd><code>E</code> - Element type</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.lang.AutoCloseable</code>, <code><a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><E></code></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><code><a href="Linq4j.CartesianProductListEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.CartesianProductListEnumerator</a></code>, <code><a href="../runtime/SqlFunctions.ProductComparableListEnumerator.html" title="class in org.apache.calcite.runtime">SqlFunctions.ProductComparableListEnumerator</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public abstract class <span class="typeNameLabel">CartesianProductEnumerator<T,​E></span> |
| extends java.lang.Object |
| implements <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><E></pre> |
| <div class="block">Enumerator over the cartesian product of enumerators.</div> |
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| <table class="memberSummary"> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected <a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#elements">elements</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#enumerators">enumerators</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#first">first</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colSecond" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.List)">CartesianProductEnumerator</a></span>​(java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>>> enumerators)</code></th> |
| <td class="colLast"> </td> |
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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>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close()">close</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Closes this enumerable and releases resources.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#moveNext()">moveNext</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Advances the enumerator to the next element of the collection.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#reset()">reset</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Sets the enumerator to its initial position, which is before the first |
| element in the collection.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </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> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.org.apache.calcite.linq4j.Enumerator"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.calcite.linq4j.<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a></h3> |
| <code><a href="Enumerator.html#current()">current</a></code></li> |
| </ul> |
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| <h3>Field Detail</h3> |
| <a id="enumerators"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>enumerators</h4> |
| <pre>private final java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>>> enumerators</pre> |
| </li> |
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| <a id="elements"> |
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| </a> |
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| <li class="blockList"> |
| <h4>elements</h4> |
| <pre>protected final <a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>[] elements</pre> |
| </li> |
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| <a id="first"> |
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| <h4>first</h4> |
| <pre>private boolean first</pre> |
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| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>CartesianProductEnumerator</h4> |
| <pre>protected CartesianProductEnumerator​(java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>>> enumerators)</pre> |
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| <h4>moveNext</h4> |
| <pre class="methodSignature">public boolean moveNext()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="Enumerator.html#moveNext()">Enumerator</a></code></span></div> |
| <div class="block">Advances the enumerator to the next element of the collection. |
| |
| <p>After an enumerator is created or after the <code>reset</code> method is |
| called, an enumerator is positioned before the first element of the |
| collection, and the first call to the <code>moveNext</code> method moves the |
| enumerator over the first element of the collection. |
| |
| <p>If <code>moveNext</code> passes the end of the collection, the enumerator |
| is positioned after the last element in the collection and |
| <code>moveNext</code> returns <code>false</code>. When the enumerator is at this |
| position, subsequent calls to <code>moveNext</code> also return <code>false</code> |
| until <code>#reset</code> is called. |
| |
| <p>An enumerator remains valid as long as the collection remains |
| unchanged. If changes are made to the collection, such as adding, |
| modifying, or deleting elements, the enumerator is irrecoverably |
| invalidated. The next call to <code>moveNext</code> or <a href="Enumerator.html#reset()"><code>Enumerator.reset()</code></a> may, |
| at the discretion of the implementation, throw a |
| <code>ConcurrentModificationException</code>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="Enumerator.html#moveNext()">moveNext</a></code> in interface <code><a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the enumerator was successfully advanced to the |
| next element; <code>false</code> if the enumerator has passed the end of |
| the collection</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="reset()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>reset</h4> |
| <pre class="methodSignature">public void reset()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="Enumerator.html#reset()">Enumerator</a></code></span></div> |
| <div class="block">Sets the enumerator to its initial position, which is before the first |
| element in the collection. |
| |
| <p>An enumerator remains valid as long as the collection remains |
| unchanged. If changes are made to the collection, such as adding, |
| modifying, or deleting elements, the enumerator is irrecoverably |
| invalidated. The next call to <a href="Enumerator.html#moveNext()"><code>Enumerator.moveNext()</code></a> or <code>reset</code> may, |
| at the discretion of the implementation, throw a |
| <code>ConcurrentModificationException</code>. |
| |
| <p>This method is optional; it may throw |
| <code>UnsupportedOperationException</code>. |
| |
| <h3>Notes to Implementers</h3> |
| |
| <p>All calls to Reset must result in the same state for the enumerator. |
| The preferred implementation is to move the enumerator to the beginning |
| of the collection, before the first element. This invalidates the |
| enumerator if the collection has been modified since the enumerator was |
| created, which is consistent with <a href="Enumerator.html#moveNext()"><code>Enumerator.moveNext()</code></a> and |
| <a href="Enumerator.html#current()"><code>Enumerator.current()</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="Enumerator.html#reset()">reset</a></code> in interface <code><a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>></code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>close</h4> |
| <pre class="methodSignature">public void close()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="Enumerator.html#close()">Enumerator</a></code></span></div> |
| <div class="block">Closes this enumerable and releases resources. |
| |
| <p>This method is idempotent. Calling it multiple times has the same effect |
| as calling it once.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>close</code> in interface <code>java.lang.AutoCloseable</code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="Enumerator.html#close()">close</a></code> in interface <code><a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><<a href="CartesianProductEnumerator.html" title="type parameter in CartesianProductEnumerator">T</a>></code></dd> |
| </dl> |
| </li> |
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