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| <div class="subTitle">org.apache.datasketches.hash</div> |
| <h2 title="Class MurmurHash3v2" class="title">Class MurmurHash3v2</h2> |
| </div> |
| <div class="contentContainer"> |
| <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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| <li>org.apache.datasketches.hash.MurmurHash3v2</li> |
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| <pre>public final class <span class="typeNameLabel">MurmurHash3v2</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"><p>The MurmurHash3 is a fast, non-cryptographic, 128-bit hash function that has |
| excellent avalanche and 2-way bit independence properties.</p> |
| |
| <p>Austin Appleby's C++ |
| <a href="https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp"> |
| MurmurHash3_x64_128(...), final revision 150</a>, |
| which is in the Public Domain, was the inspiration for this implementation in Java.</p> |
| |
| <p>This implementation of the MurmurHash3 allows hashing of a block of Memory defined by an offset |
| and length. The calling API also allows the user to supply the small output array of two longs, |
| so that the entire hash function is static and free of object allocations.</p> |
| |
| <p>This implementation produces exactly the same hash result as the |
| <a href="../../../../org/apache/datasketches/hash/MurmurHash3.html#hash-long:A-long-"><code>MurmurHash3.hash(long[], long)</code></a> function given compatible inputs.</p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#MurmurHash3v2--">MurmurHash3v2</a></span>()</code> </td> |
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| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-byte:A-long-">hash</a></span>(byte[] in, |
| long seed)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-char:A-long-">hash</a></span>(char[] in, |
| long seed)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-double-long-long:A-">hash</a></span>(double in, |
| long seed, |
| long[] hashOut)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-int:A-long-">hash</a></span>(int[] in, |
| long seed)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-long:A-long-">hash</a></span>(long[] in, |
| long seed)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-long-long-long:A-">hash</a></span>(long in, |
| long seed, |
| long[] hashOut)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-org.apache.datasketches.memory.Memory-long-long-long-long:A-">hash</a></span>(org.apache.datasketches.memory.Memory mem, |
| long offsetBytes, |
| long lengthBytes, |
| long seed, |
| long[] hashOut)</code> |
| <div class="block">Returns a 128-bit hash of the input as a long array of size 2.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/hash/MurmurHash3v2.html#hash-java.lang.String-long-long:A-">hash</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> in, |
| long seed, |
| long[] hashOut)</code> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| </td> |
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| <a name="MurmurHash3v2--"> |
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| <h4>MurmurHash3v2</h4> |
| <pre>public MurmurHash3v2()</pre> |
| </li> |
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| <ul class="blockList"> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(long[] in, |
| long seed)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Provided for compatibility with older version of MurmurHash3, |
| but empty or null input now returns a hash.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - long array</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hash-int:A-long-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(int[] in, |
| long seed)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Provided for compatibility with older version of MurmurHash3, |
| but empty or null input now returns a hash.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - int array</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(char[] in, |
| long seed)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Provided for compatibility with older version of MurmurHash3, |
| but empty or null input now returns a hash.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - char array</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hash-byte:A-long-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(byte[] in, |
| long seed)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Provided for compatibility with older version of MurmurHash3, |
| but empty or null input now returns a hash.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - byte array</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hash</h4> |
| <pre>public static long[] hash(long in, |
| long seed, |
| long[] hashOut)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Note the entropy of the resulting hash cannot be more than 64 bits.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - a long</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dd><code>hashOut</code> - A long array of size 2</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hash-double-long-long:A-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(double in, |
| long seed, |
| long[] hashOut)</pre> |
| <div class="block">Returns a 128-bit hash of the input. |
| Note the entropy of the resulting hash cannot be more than 64 bits.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - a double</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dd><code>hashOut</code> - A long array of size 2</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
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| <!-- --> |
| </a> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> in, |
| long seed, |
| long[] hashOut)</pre> |
| <div class="block">Returns a 128-bit hash of the input.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - a String</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dd><code>hashOut</code> - A long array of size 2</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash</dd> |
| </dl> |
| </li> |
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| <h4>hash</h4> |
| <pre>public static long[] hash(org.apache.datasketches.memory.Memory mem, |
| long offsetBytes, |
| long lengthBytes, |
| long seed, |
| long[] hashOut)</pre> |
| <div class="block">Returns a 128-bit hash of the input as a long array of size 2.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>mem</code> - The input Memory. Must be non-null and non-empty.</dd> |
| <dd><code>offsetBytes</code> - the starting point within Memory.</dd> |
| <dd><code>lengthBytes</code> - the total number of bytes to be hashed.</dd> |
| <dd><code>seed</code> - A long valued seed.</dd> |
| <dd><code>hashOut</code> - the size 2 long array for the resulting 128-bit hash</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash.</dd> |
| </dl> |
| </li> |
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