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| <h2 title="Class Util" class="title">Class Util</h2> |
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| <pre>public final class <span class="typeNameLabel">Util</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Common utility functions for Tuples</div> |
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| <td class="colFirst"><code>static void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#checkSeedHashes-short-short-">checkSeedHashes</a></span>​(short seedHashA, |
| short seedHashB)</code></th> |
| <td class="colLast"> |
| <div class="block">Checks the two given seed hashes.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static short</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#computeSeedHash-long-">computeSeedHash</a></span>​(long seed)</code></th> |
| <td class="colLast"> |
| <div class="block">Computes and checks the 16-bit seed hash from the given long seed.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#doubleToLongArray-double-">doubleToLongArray</a></span>​(double value)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts a <i>double</i> to a <i>long[]</i>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#getStartingCapacity-int-int-">getStartingCapacity</a></span>​(int nomEntries, |
| int lgResizeFactor)</code></th> |
| <td class="colLast"> |
| <div class="block">Gets the starting capacity of a new sketch given the Nominal Entries and the log Resize Factor.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#stringArrHash-java.lang.String:A-">stringArrHash</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] strArray)</code></th> |
| <td class="colLast"> </td> |
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| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#stringConcat-java.lang.String:A-">stringConcat</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] strArr)</code></th> |
| <td class="colLast"> |
| <div class="block">Concatenate array of Strings to a single String.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#stringHash-java.lang.String-">stringHash</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> s)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static byte[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/datasketches/tuple/Util.html#stringToByteArray-java.lang.String-">stringToByteArray</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> value)</code></th> |
| <td class="colLast"> |
| <div class="block">Converts a String to a UTF_8 byte array.</div> |
| </td> |
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| <pre>public Util​()</pre> |
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| <pre>public static final long[] doubleToLongArray​(double value)</pre> |
| <div class="block">Converts a <i>double</i> to a <i>long[]</i>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - the given double value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the long array</dd> |
| </dl> |
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| <h4>stringToByteArray</h4> |
| <pre>public static final byte[] stringToByteArray​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> value)</pre> |
| <div class="block">Converts a String to a UTF_8 byte array. If the given value is either null or empty this |
| method returns null.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - the given String value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the UTF_8 byte array</dd> |
| </dl> |
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| <h4>computeSeedHash</h4> |
| <pre>public static short computeSeedHash​(long seed)</pre> |
| <div class="block">Computes and checks the 16-bit seed hash from the given long seed. |
| The seed hash may not be zero in order to maintain compatibility with older serialized |
| versions that did not have this concept.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>seed</code> - <a href="../../../../resources/dictionary.html#seed">See Update Hash Seed</a></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the seed hash.</dd> |
| </dl> |
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| <h4>checkSeedHashes</h4> |
| <pre>public static final void checkSeedHashes​(short seedHashA, |
| short seedHashB)</pre> |
| <div class="block">Checks the two given seed hashes. If they are not equal, this method throws an Exception.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>seedHashA</code> - given seed hash A</dd> |
| <dd><code>seedHashB</code> - given seed hash B</dd> |
| </dl> |
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| <h4>getStartingCapacity</h4> |
| <pre>public static int getStartingCapacity​(int nomEntries, |
| int lgResizeFactor)</pre> |
| <div class="block">Gets the starting capacity of a new sketch given the Nominal Entries and the log Resize Factor.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nomEntries</code> - the given Nominal Entries</dd> |
| <dd><code>lgResizeFactor</code> - the given log Resize Factor</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the starting capacity</dd> |
| </dl> |
| </li> |
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| </a> |
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| <h4>stringConcat</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> stringConcat​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] strArr)</pre> |
| <div class="block">Concatenate array of Strings to a single String.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>strArr</code> - the given String array</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the concatenated String</dd> |
| </dl> |
| </li> |
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| <pre>public static long stringHash​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> s)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>s</code> - the string to hash</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the hash of the string</dd> |
| </dl> |
| </li> |
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| <h4>stringArrHash</h4> |
| <pre>public static long stringArrHash​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] strArray)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>strArray</code> - array of Strings</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>long hash of concatenated strings.</dd> |
| </dl> |
| </li> |
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