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| <div class="subTitle">org.apache.arrow.memory.util.hash</div> |
| <h2 title="Class SimpleHasher" class="title">Class SimpleHasher</h2> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <ul class="inheritance"> |
| <li>org.apache.arrow.memory.util.hash.SimpleHasher</li> |
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| <dd><a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a></dd> |
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| <pre>public class <span class="typeNameLabel">SimpleHasher</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> |
| implements <a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a></pre> |
| <div class="block">A simple hasher that calculates the hash code of integers as is, |
| and does not perform any finalization. So the computation is extremely |
| efficient. |
| <p> |
| This algorithm only provides the most basic semantics for the hash code. That is, |
| if two objects are equal, they must have equal hash code. However, the quality of the |
| produced hash code may not be good. In other words, the generated hash codes are |
| far from being uniformly distributed in the universe. |
| </p> |
| <p> |
| Therefore, this algorithm is suitable only for scenarios where the most basic semantics |
| of the hash code is required (e.g. in scenarios that require fast and proactive data pruning) |
| </p> |
| <p> |
| An object of this class is stateless, so it can be shared between threads. |
| </p></div> |
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| <td class="colFirst"><code>static <a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html" title="class in org.apache.arrow.memory.util.hash">SimpleHasher</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#INSTANCE">INSTANCE</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#SimpleHasher--">SimpleHasher</a></span>()</code> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#combineHashCode-int-int-">combineHashCode</a></span>(int currentHashCode, |
| int newHashCode)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#equals-java.lang.Object-">equals</a></span>(@Nullable <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> obj)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#finalizeHashCode-int-">finalizeHashCode</a></span>(int hashCode)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#getLongHashCode-long-">getLongHashCode</a></span>(long longValue)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#hashCode--">hashCode</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#hashCode-org.apache.arrow.memory.ArrowBuf-long-long-">hashCode</a></span>(<a href="../../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> buf, |
| long offset, |
| long length)</code> |
| <div class="block">Calculates the hash code for a memory region.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html#hashCode-long-long-">hashCode</a></span>(long address, |
| long length)</code> |
| <div class="block">Calculates the hash code for a memory region.</div> |
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| <h4>INSTANCE</h4> |
| <pre>public static <a href="../../../../../../org/apache/arrow/memory/util/hash/SimpleHasher.html" title="class in org.apache.arrow.memory.util.hash">SimpleHasher</a> INSTANCE</pre> |
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| <h4>SimpleHasher</h4> |
| <pre>protected SimpleHasher()</pre> |
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| <h4>hashCode</h4> |
| <pre>public int hashCode(long address, |
| long length)</pre> |
| <div class="block">Calculates the hash code for a memory region.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html#hashCode-long-long-">hashCode</a></code> in interface <code><a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>address</code> - start address of the memory region.</dd> |
| <dd><code>length</code> - length of the memory region.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash code.</dd> |
| </dl> |
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| <h4>hashCode</h4> |
| <pre>public int hashCode(<a href="../../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> buf, |
| long offset, |
| long length)</pre> |
| <div class="block">Calculates the hash code for a memory region.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html#hashCode-org.apache.arrow.memory.ArrowBuf-long-long-">hashCode</a></code> in interface <code><a href="../../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buf</code> - the buffer for the memory region.</dd> |
| <dd><code>offset</code> - offset within the buffer for the memory region.</dd> |
| <dd><code>length</code> - length of the memory region.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash code.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="combineHashCode-int-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>combineHashCode</h4> |
| <pre>protected int combineHashCode(int currentHashCode, |
| int newHashCode)</pre> |
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| </a> |
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| <h4>getLongHashCode</h4> |
| <pre>protected int getLongHashCode(long longValue)</pre> |
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| </a> |
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| <h4>finalizeHashCode</h4> |
| <pre>protected int finalizeHashCode(int hashCode)</pre> |
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| <pre>public int hashCode()</pre> |
| <dl> |
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| <dd><code><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></code> in class <code><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></code></dd> |
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