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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 Linq4j" class="title">Class Linq4j</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.calcite.linq4j.Linq4j</li> |
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| <pre>public abstract class <span class="typeNameLabel">Linq4j</span> |
| extends java.lang.Object</pre> |
| <div class="block">Utility and factory methods for Linq4j.</div> |
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| <h3>Nested Class Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <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>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.CartesianProductListEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.CartesianProductListEnumerator</a><<a href="Linq4j.CartesianProductListEnumerator.html" title="type parameter in Linq4j.CartesianProductListEnumerator">E</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Enumerates over the cartesian product of the given lists, returning |
| a list for each row.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.CollectionEnumerable.html" title="class in org.apache.calcite.linq4j">Linq4j.CollectionEnumerable</a><<a href="Linq4j.CollectionEnumerable.html" title="type parameter in Linq4j.CollectionEnumerable">T</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Collection enumerable.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.CompositeEnumerable.html" title="class in org.apache.calcite.linq4j">Linq4j.CompositeEnumerable</a><<a href="Linq4j.CompositeEnumerable.html" title="type parameter in Linq4j.CompositeEnumerable">E</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Composite enumerable.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.EnumeratorIterator.html" title="class in org.apache.calcite.linq4j">Linq4j.EnumeratorIterator</a><<a href="Linq4j.EnumeratorIterator.html" title="type parameter in Linq4j.EnumeratorIterator">T</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Iterator that reads from an underlying <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.IterableEnumerable.html" title="class in org.apache.calcite.linq4j">Linq4j.IterableEnumerable</a><<a href="Linq4j.IterableEnumerable.html" title="type parameter in Linq4j.IterableEnumerable">T</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Iterable enumerable.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.IterableEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.IterableEnumerator</a><<a href="Linq4j.IterableEnumerator.html" title="type parameter in Linq4j.IterableEnumerator">T</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Iterable enumerator.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.ListEnumerable.html" title="class in org.apache.calcite.linq4j">Linq4j.ListEnumerable</a><<a href="Linq4j.ListEnumerable.html" title="type parameter in Linq4j.ListEnumerable">T</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">List enumerable.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.ListEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.ListEnumerator</a><<a href="Linq4j.ListEnumerator.html" title="type parameter in Linq4j.ListEnumerator">V</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Enumerator optimized for random-access list.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.SingletonEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.SingletonEnumerator</a><<a href="Linq4j.SingletonEnumerator.html" title="type parameter in Linq4j.SingletonEnumerator">E</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Enumerator that returns one element.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Linq4j.SingletonNullEnumerator.html" title="class in org.apache.calcite.linq4j">Linq4j.SingletonNullEnumerator</a><<a href="Linq4j.SingletonNullEnumerator.html" title="type parameter in Linq4j.SingletonNullEnumerator">E</a>></span></code></th> |
| <td class="colLast"> |
| <div class="block">Enumerator that returns one null element.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <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>static <a href="QueryProvider.html" title="interface in org.apache.calcite.linq4j">QueryProvider</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DEFAULT_PROVIDER">DEFAULT_PROVIDER</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Query provider that simply executes a <a href="Queryable.html" title="interface in org.apache.calcite.linq4j"><code>Queryable</code></a> by calling its |
| enumerator method; does not attempt optimization.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static java.lang.Object</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#DUMMY">DUMMY</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><?></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#EMPTY_ENUMERABLE">EMPTY_ENUMERABLE</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><java.lang.Object></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#EMPTY_ENUMERATOR">EMPTY_ENUMERATOR</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
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| <h3>Constructor Summary</h3> |
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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>private </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">Linq4j</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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 <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#asEnumerable(java.lang.Iterable)">asEnumerable</a></span>​(java.lang.Iterable<T> iterable)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an <code>Iterable</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#asEnumerable(java.util.Collection)">asEnumerable</a></span>​(java.util.Collection<T> collection)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an <code>Collection</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#asEnumerable(java.util.List)">asEnumerable</a></span>​(java.util.List<T> list)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an <code>List</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#asEnumerable(T%5B%5D)">asEnumerable</a></span>​(T[] ts)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an array into an enumerable.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <TSource,​TResult><br><a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><TResult></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#cast(java.lang.Iterable,java.lang.Class)">cast</a></span>​(java.lang.Iterable<TSource> source, |
| java.lang.Class<TResult> clazz)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts the elements of a given Iterable to the specified type.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private static <T> void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#closeIterator(java.util.Iterator)">closeIterator</a></span>​(java.util.Iterator<T> iterator)</code></th> |
| <td class="colLast"> |
| <div class="block">Closes an iterator, if it can be closed.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <E> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#concat(java.util.List)">concat</a></span>​(java.util.List<<a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><E>> enumerableList)</code></th> |
| <td class="colLast"> |
| <div class="block">Concatenates two or more <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>s to form a composite |
| enumerable that contains the union of their elements.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#emptyEnumerable()">emptyEnumerable</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a> that has no elements.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#emptyEnumerator()">emptyEnumerator</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has no elements.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static <V> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><V></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#enumerator(java.util.Collection)">enumerator</a></span>​(java.util.Collection<? extends V> values)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts a collection into an enumerator.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static <T> java.util.Iterator<T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#enumeratorIterator(org.apache.calcite.linq4j.Enumerator)">enumeratorIterator</a></span>​(<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> enumerator)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an enumerator into an iterator.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>static <T> boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(T,T)">equals</a></span>​(T t0, |
| T t1)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span></div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>static java.lang.reflect.Method</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMethod(java.lang.String,java.lang.String,java.lang.Class...)">getMethod</a></span>​(java.lang.String className, |
| java.lang.String methodName, |
| java.lang.Class... parameterTypes)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#iterableEnumerator(java.lang.Iterable)">iterableEnumerator</a></span>​(java.lang.Iterable<? extends T> iterable)</code></th> |
| <td class="colLast"> |
| <div class="block">Adapter that converts an iterable into an enumerator.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>private static <V> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><V></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#listEnumerator(java.util.List)">listEnumerator</a></span>​(java.util.List<? extends V> list)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>static <TSource,​TResult><br><a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><TResult></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#ofType(java.lang.Iterable,java.lang.Class)">ofType</a></span>​(java.lang.Iterable<TSource> source, |
| java.lang.Class<TResult> clazz)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns elements of a given <code>Iterable</code> that are of the specified |
| type.</div> |
| </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>static <T> java.lang.Iterable<java.util.List<T>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#product(java.lang.Iterable)">product</a></span>​(java.lang.Iterable<? extends java.lang.Iterable<T>> iterables)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the cartesian product of an iterable of iterables.</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><java.util.List<T>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#product(java.util.List)">product</a></span>​(java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T>> enumerators)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an enumerator that is the cartesian product of the given |
| enumerators.</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>static <T> T</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#requireNonNull(T)">requireNonNull</a></span>​(T o)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span></div> |
| </td> |
| </tr> |
| <tr id="i19" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#singletonEnumerable(T)">singletonEnumerable</a></span>​(T element)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a> that has one element.</div> |
| </td> |
| </tr> |
| <tr id="i20" class="altColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#singletonEnumerator(T)">singletonEnumerator</a></span>​(T element)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has one element.</div> |
| </td> |
| </tr> |
| <tr id="i21" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#singletonNullEnumerator()">singletonNullEnumerator</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has one null element.</div> |
| </td> |
| </tr> |
| <tr id="i22" class="altColor"> |
| <td class="colFirst"><code>static <F,​E><br><a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><E></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#transform(org.apache.calcite.linq4j.Enumerator,org.apache.calcite.linq4j.function.Function1)">transform</a></span>​(<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><F> enumerator, |
| <a href="function/Function1.html" title="interface in org.apache.calcite.linq4j.function">Function1</a><F,​E> func)</code></th> |
| <td class="colLast"> |
| <div class="block">Applies a function to each element of an Enumerator.</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> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <section role="region"> |
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| <h3>Field Detail</h3> |
| <a id="DUMMY"> |
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| <h4>DUMMY</h4> |
| <pre>private static final java.lang.Object DUMMY</pre> |
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| <a id="DEFAULT_PROVIDER"> |
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| </a> |
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| <h4>DEFAULT_PROVIDER</h4> |
| <pre>public static final <a href="QueryProvider.html" title="interface in org.apache.calcite.linq4j">QueryProvider</a> DEFAULT_PROVIDER</pre> |
| <div class="block">Query provider that simply executes a <a href="Queryable.html" title="interface in org.apache.calcite.linq4j"><code>Queryable</code></a> by calling its |
| enumerator method; does not attempt optimization.</div> |
| </li> |
| </ul> |
| <a id="EMPTY_ENUMERATOR"> |
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| </a> |
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| <h4>EMPTY_ENUMERATOR</h4> |
| <pre>private static final <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><java.lang.Object> EMPTY_ENUMERATOR</pre> |
| </li> |
| </ul> |
| <a id="EMPTY_ENUMERABLE"> |
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| <h4>EMPTY_ENUMERABLE</h4> |
| <pre>public static final <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><?> EMPTY_ENUMERABLE</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a id="<init>()"> |
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| <li class="blockList"> |
| <h4>Linq4j</h4> |
| <pre>private Linq4j()</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
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| <h4>getMethod</h4> |
| <pre class="methodSignature">public static java.lang.reflect.Method getMethod​(java.lang.String className, |
| java.lang.String methodName, |
| java.lang.Class... parameterTypes)</pre> |
| </li> |
| </ul> |
| <a id="enumeratorIterator(org.apache.calcite.linq4j.Enumerator)"> |
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| </a> |
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| <h4>enumeratorIterator</h4> |
| <pre class="methodSignature">public static <T> java.util.Iterator<T> enumeratorIterator​(<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> enumerator)</pre> |
| <div class="block">Adapter that converts an enumerator into an iterator. |
| |
| <p><b>WARNING</b>: The iterator returned by this method does not call |
| <a href="Enumerator.html#close()"><code>Enumerator.close()</code></a>, so it is not safe to |
| use with an enumerator that allocates resources.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>enumerator</code> - Enumerator</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Iterator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="iterableEnumerator(java.lang.Iterable)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>iterableEnumerator</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> iterableEnumerator​(java.lang.Iterable<? extends T> iterable)</pre> |
| <div class="block">Adapter that converts an iterable into an enumerator.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>iterable</code> - Iterable</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="asEnumerable(java.util.List)"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>asEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> asEnumerable​(java.util.List<T> list)</pre> |
| <div class="block">Adapter that converts an <code>List</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - List</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="asEnumerable(java.util.Collection)"> |
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| <h4>asEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> asEnumerable​(java.util.Collection<T> collection)</pre> |
| <div class="block">Adapter that converts an <code>Collection</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>. |
| |
| <p>It uses more efficient implementations if the iterable happens to |
| be a <code>List</code>.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>collection</code> - Collection</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="asEnumerable(java.lang.Iterable)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>asEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> asEnumerable​(java.lang.Iterable<T> iterable)</pre> |
| <div class="block">Adapter that converts an <code>Iterable</code> into an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>. |
| |
| <p>It uses more efficient implementations if the iterable happens to |
| be a <code>Collection</code> or a <code>List</code>.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>iterable</code> - Iterable</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="asEnumerable(java.lang.Object[])"> |
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| </a><a id="asEnumerable(T[])"> |
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| <h4>asEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> asEnumerable​(T[] ts)</pre> |
| <div class="block">Adapter that converts an array into an enumerable.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>ts</code> - Array</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="enumerator(java.util.Collection)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>enumerator</h4> |
| <pre class="methodSignature">public static <V> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><V> enumerator​(java.util.Collection<? extends V> values)</pre> |
| <div class="block">Adapter that converts a collection into an enumerator.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>V</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - Collection</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Enumerator over the collection</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="listEnumerator(java.util.List)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>listEnumerator</h4> |
| <pre class="methodSignature">private static <V> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><V> listEnumerator​(java.util.List<? extends V> list)</pre> |
| </li> |
| </ul> |
| <a id="transform(org.apache.calcite.linq4j.Enumerator,org.apache.calcite.linq4j.function.Function1)"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>transform</h4> |
| <pre class="methodSignature">public static <F,​E> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><E> transform​(<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><F> enumerator, |
| <a href="function/Function1.html" title="interface in org.apache.calcite.linq4j.function">Function1</a><F,​E> func)</pre> |
| <div class="block">Applies a function to each element of an Enumerator.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>F</code> - Backing element type</dd> |
| <dd><code>E</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>enumerator</code> - Backing enumerator</dd> |
| <dd><code>func</code> - Transform function</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="cast(java.lang.Iterable,java.lang.Class)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cast</h4> |
| <pre class="methodSignature">public static <TSource,​TResult> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><TResult> cast​(java.lang.Iterable<TSource> source, |
| java.lang.Class<TResult> clazz)</pre> |
| <div class="block">Converts the elements of a given Iterable to the specified type. |
| |
| <p>This method is implemented by using deferred execution. The immediate |
| return value is an object that stores all the information that is |
| required to perform the action. The query represented by this method is |
| not executed until the object is enumerated either by calling its |
| <a href="RawEnumerable.html#enumerator()"><code>RawEnumerable.enumerator()</code></a> method directly or by using |
| <code>for (... in ...)</code>. |
| |
| <p>Since standard Java <code>Collection</code> objects implement the |
| <code>Iterable</code> interface, the <code>cast</code> method enables the standard |
| query operators to be invoked on collections |
| (including <code>List</code> and <code>Set</code>) by supplying |
| the necessary type information. For example, <code>ArrayList</code> does not |
| implement <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a><F>, but you can invoke |
| |
| <blockquote><code>Linq4j.cast(list, Integer.class)</code></blockquote> |
| |
| <p>to convert the list of an enumerable that can be queried using the |
| standard query operators. |
| |
| <p>If an element cannot be cast to type <TResult>, this method will |
| throw a <code>ClassCastException</code>. To obtain only those elements that |
| can be cast to type TResult, use the <a href="#ofType(java.lang.Iterable,java.lang.Class)"><code>ofType(java.lang.Iterable<TSource>, java.lang.Class<TResult>)</code></a> method instead.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="ExtendedEnumerable.html#cast(java.lang.Class)"><code>ExtendedEnumerable.cast(Class)</code></a>, |
| <a href="#ofType(java.lang.Iterable,java.lang.Class)"><code>ofType(java.lang.Iterable<TSource>, java.lang.Class<TResult>)</code></a>, |
| <a href="#asEnumerable(java.lang.Iterable)"><code>asEnumerable(Iterable)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="ofType(java.lang.Iterable,java.lang.Class)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ofType</h4> |
| <pre class="methodSignature">public static <TSource,​TResult> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><TResult> ofType​(java.lang.Iterable<TSource> source, |
| java.lang.Class<TResult> clazz)</pre> |
| <div class="block">Returns elements of a given <code>Iterable</code> that are of the specified |
| type. |
| |
| <p>This method is implemented by using deferred execution. The immediate |
| return value is an object that stores all the information that is |
| required to perform the action. The query represented by this method is |
| not executed until the object is enumerated either by calling its |
| <a href="RawEnumerable.html#enumerator()"><code>RawEnumerable.enumerator()</code></a> method directly or by using |
| <code>for (... in ...)</code>. |
| |
| <p>The <code>ofType</code> method returns only those elements in source that |
| can be cast to type TResult. To instead receive an exception if an |
| element cannot be cast to type TResult, use |
| <a href="#cast(java.lang.Iterable,java.lang.Class)"><code>cast(Iterable, Class)</code></a>.</p> |
| |
| <p>Since standard Java <code>Collection</code> objects implement the |
| <code>Iterable</code> interface, the <code>cast</code> method enables the standard |
| query operators to be invoked on collections |
| (including <code>List</code> and <code>Set</code>) by supplying |
| the necessary type information. For example, <code>ArrayList</code> does not |
| implement <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a><F>, but you can invoke |
| |
| <blockquote><code>Linq4j.ofType(list, Integer.class)</code></blockquote> |
| |
| <p>to convert the list of an enumerable that can be queried using the |
| standard query operators.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="ExtendedEnumerable.html#cast(java.lang.Class)"><code>ExtendedEnumerable.cast(Class)</code></a>, |
| <a href="#cast(java.lang.Iterable,java.lang.Class)"><code>cast(java.lang.Iterable<TSource>, java.lang.Class<TResult>)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="singletonEnumerable(java.lang.Object)"> |
| <!-- --> |
| </a><a id="singletonEnumerable(T)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>singletonEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> singletonEnumerable​(T element)</pre> |
| <div class="block">Returns an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a> that has one element.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Singleton enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="singletonEnumerator(java.lang.Object)"> |
| <!-- --> |
| </a><a id="singletonEnumerator(T)"> |
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| </a> |
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| <h4>singletonEnumerator</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> singletonEnumerator​(T element)</pre> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has one element.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Singleton enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="singletonNullEnumerator()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>singletonNullEnumerator</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> singletonNullEnumerator()</pre> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has one null element.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Singleton enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="emptyEnumerable()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>emptyEnumerable</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><T> emptyEnumerable()</pre> |
| <div class="block">Returns an <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a> that has no elements.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Empty enumerable</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="emptyEnumerator()"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>emptyEnumerator</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T> emptyEnumerator()</pre> |
| <div class="block">Returns an <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j"><code>Enumerator</code></a> that has no elements.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Empty enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="concat(java.util.List)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>concat</h4> |
| <pre class="methodSignature">public static <E> <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><E> concat​(java.util.List<<a href="Enumerable.html" title="interface in org.apache.calcite.linq4j">Enumerable</a><E>> enumerableList)</pre> |
| <div class="block">Concatenates two or more <a href="Enumerable.html" title="interface in org.apache.calcite.linq4j"><code>Enumerable</code></a>s to form a composite |
| enumerable that contains the union of their elements.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>E</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>enumerableList</code> - List of enumerable objects</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Composite enumerator</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="product(java.util.List)"> |
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| <ul class="blockList"> |
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| <h4>product</h4> |
| <pre class="methodSignature">public static <T> <a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><java.util.List<T>> product​(java.util.List<<a href="Enumerator.html" title="interface in org.apache.calcite.linq4j">Enumerator</a><T>> enumerators)</pre> |
| <div class="block">Returns an enumerator that is the cartesian product of the given |
| enumerators. |
| |
| <p>For example, given enumerator A that returns {"a", "b", "c"} and |
| enumerator B that returns {"x", "y"}, product(List(A, B)) will return |
| {List("a", "x"), List("a", "y"), |
| List("b", "x"), List("b", "y"), |
| List("c", "x"), List("c", "y")}.</p> |
| |
| <p>Notice that the cardinality of the result is the product of the |
| cardinality of the inputs. The enumerators A and B have 3 and 2 |
| elements respectively, and the result has 3 * 2 = 6 elements. |
| This is always the case. In |
| particular, if any of the enumerators is empty, the result is empty.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Element type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>enumerators</code> - List of enumerators</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Enumerator over the cartesian product</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="product(java.lang.Iterable)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>product</h4> |
| <pre class="methodSignature">public static <T> java.lang.Iterable<java.util.List<T>> product​(java.lang.Iterable<? extends java.lang.Iterable<T>> iterables)</pre> |
| <div class="block">Returns the cartesian product of an iterable of iterables.</div> |
| </li> |
| </ul> |
| <a id="equals(java.lang.Object,java.lang.Object)"> |
| <!-- --> |
| </a><a id="equals(T,T)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>equals</h4> |
| <pre class="methodSignature">@Deprecated |
| public static <T> boolean equals​(T t0, |
| T t1)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div> |
| <div class="block">Returns whether the arguments are equal to each other. |
| |
| <p>Equivalent to <code>Objects.equals(java.lang.Object, java.lang.Object)</code> in JDK 1.7 and above.</div> |
| </li> |
| </ul> |
| <a id="requireNonNull(java.lang.Object)"> |
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| </a><a id="requireNonNull(T)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>requireNonNull</h4> |
| <pre class="methodSignature">@Deprecated |
| public static <T> T requireNonNull​(T o)</pre> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span></div> |
| <div class="block">Throws <code>NullPointerException</code> if argument is null, otherwise |
| returns argument. |
| |
| <p>Equivalent to <code>Objects.requireNonNull(T)</code> in JDK 1.7 and |
| above.</div> |
| </li> |
| </ul> |
| <a id="closeIterator(java.util.Iterator)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>closeIterator</h4> |
| <pre class="methodSignature">private static <T> void closeIterator​(java.util.Iterator<T> iterator)</pre> |
| <div class="block">Closes an iterator, if it can be closed.</div> |
| </li> |
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