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| <div class="subTitle">org.apache.arrow.vector</div> |
| <h2 title="Class AllocationHelper" class="title">Class AllocationHelper</h2> |
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| <li>org.apache.arrow.vector.AllocationHelper</li> |
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| <pre>public class <span class="typeNameLabel">AllocationHelper</span> |
| 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></pre> |
| <div class="block">Helper utility methods for allocating storage for Vectors.</div> |
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| <h3>Method Summary</h3> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/vector/AllocationHelper.html#allocate-org.apache.arrow.vector.ValueVector-int-int-">allocate</a></span>(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue)</code> |
| <div class="block">Allocates the vector.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/vector/AllocationHelper.html#allocate-org.apache.arrow.vector.ValueVector-int-int-int-">allocate</a></span>(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue, |
| int repeatedPerTop)</code> |
| <div class="block">Allocates memory for a vector assuming given number of values and their width.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/vector/AllocationHelper.html#allocateNew-org.apache.arrow.vector.ValueVector-int-">allocateNew</a></span>(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount)</code> |
| <div class="block">Allocates the exact amount if v is fixed width, otherwise falls back to dynamic allocation.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/arrow/vector/AllocationHelper.html#allocatePrecomputedChildCount-org.apache.arrow.vector.ValueVector-int-int-int-">allocatePrecomputedChildCount</a></span>(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue, |
| int childValCount)</code> |
| <div class="block">Allocates memory for a vector assuming given number of values and their width.</div> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <a name="allocate-org.apache.arrow.vector.ValueVector-int-int-"> |
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| <h4>allocate</h4> |
| <pre>public static void allocate(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue)</pre> |
| <div class="block">Allocates the vector.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>v</code> - The vector to allocate.</dd> |
| <dd><code>valueCount</code> - Number of values to allocate.</dd> |
| <dd><code>bytesPerValue</code> - bytes per value.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/arrow/memory/OutOfMemoryException.html" title="class in org.apache.arrow.memory">OutOfMemoryException</a></code> - if it can't allocate the memory.</dd> |
| </dl> |
| </li> |
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| <h4>allocatePrecomputedChildCount</h4> |
| <pre>public static void allocatePrecomputedChildCount(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue, |
| int childValCount)</pre> |
| <div class="block">Allocates memory for a vector assuming given number of values and their width.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>v</code> - The vector the allocate.</dd> |
| <dd><code>valueCount</code> - The number of elements to allocate.</dd> |
| <dd><code>bytesPerValue</code> - The bytes per value to use for allocating underlying storage</dd> |
| <dd><code>childValCount</code> - If <code>v</code> is a repeated vector, this is number of child elements to allocate.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/arrow/memory/OutOfMemoryException.html" title="class in org.apache.arrow.memory">OutOfMemoryException</a></code> - if it can't allocate the memory.</dd> |
| </dl> |
| </li> |
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| <a name="allocate-org.apache.arrow.vector.ValueVector-int-int-int-"> |
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| <h4>allocate</h4> |
| <pre>public static void allocate(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount, |
| int bytesPerValue, |
| int repeatedPerTop)</pre> |
| <div class="block">Allocates memory for a vector assuming given number of values and their width.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>v</code> - The vector the allocate.</dd> |
| <dd><code>valueCount</code> - The number of elements to allocate.</dd> |
| <dd><code>bytesPerValue</code> - The bytes per value to use for allocating underlying storage</dd> |
| <dd><code>repeatedPerTop</code> - If <code>v</code> is a repeated vector, this is assumed number of elements per child.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/arrow/memory/OutOfMemoryException.html" title="class in org.apache.arrow.memory">OutOfMemoryException</a></code> - if it can't allocate the memory</dd> |
| </dl> |
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| <h4>allocateNew</h4> |
| <pre>public static void allocateNew(<a href="../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a> v, |
| int valueCount)</pre> |
| <div class="block">Allocates the exact amount if v is fixed width, otherwise falls back to dynamic allocation.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>v</code> - value vector we are trying to allocate</dd> |
| <dd><code>valueCount</code> - size we are trying to allocate</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/arrow/memory/OutOfMemoryException.html" title="class in org.apache.arrow.memory">OutOfMemoryException</a></code> - if it can't allocate the memory</dd> |
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