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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.util</a></div>
<h1 title="Class BitString" class="title">Class BitString</h1>
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<pre>public class <span class="typeNameLabel">BitString</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" class="externalLink">Object</a></pre>
<div class="block">String of bits.
<p>A bit string logically consists of a set of '0' and '1' values, of a
specified length. The length is preserved even if this means that the bit
string has leading '0's.
<p>You can create a bit string from a string of 0s and 1s
(<a href="#%3Cinit%3E(java.lang.String,int)"><code>BitString(String, int)</code></a> or <a href="#createFromBitString(java.lang.String)"><code>createFromBitString(java.lang.String)</code></a>), or from a
string of hex digits (<a href="#createFromHexString(java.lang.String)"><code>createFromHexString(java.lang.String)</code></a>). You can convert it to a
byte array (<a href="#getAsByteArray()"><code>getAsByteArray()</code></a>), to a bit string (<a href="#toBitString()"><code>toBitString()</code></a>),
or to a hex string (<a href="#toHexString()"><code>toHexString()</code></a>). A utility method
<a href="#toByteArrayFromBitString(java.lang.String,int)"><code>toByteArrayFromBitString(java.lang.String, int)</code></a> converts a bit string directly to a byte
array.
<p>This class is immutable: once created, none of the methods modify the
value.</div>
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<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String,int)">BitString</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;bits,
int&nbsp;bitCount)</code></th>
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<td class="colFirst"><code>static <a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#concat(java.util.List)">concat</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="BitString.html" title="class in org.apache.calcite.util">BitString</a>&gt;&nbsp;args)</code></th>
<td class="colLast">
<div class="block">Concatenates some BitStrings.</div>
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<td class="colFirst"><code>static <a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createFromBitString(java.lang.String)">createFromBitString</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</code></th>
<td class="colLast">
<div class="block">Creates a BitString representation out of a Bit String.</div>
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<td class="colFirst"><code>static <a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createFromBytes(byte%5B%5D)">createFromBytes</a></span>&#8203;(byte[]&nbsp;bytes)</code></th>
<td class="colLast">
<div class="block">Creates a BitString from an array of bytes.</div>
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<td class="colFirst"><code>static <a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#createFromHexString(java.lang.String)">createFromHexString</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</code></th>
<td class="colLast">
<div class="block">Creates a BitString representation out of a Hex String.</div>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(java.lang.Object)">equals</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;o)</code></th>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><code>byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getAsByteArray()">getAsByteArray</a></span>()</code></th>
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<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getBitCount()">getBitCount</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toBitString()">toBitString</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns this bit string as a bit string, such as "10110".</div>
</td>
</tr>
<tr class="rowColor" id="i9">
<td class="colFirst"><code>static byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toByteArrayFromBitString(java.lang.String,int)">toByteArrayFromBitString</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;bits,
int&nbsp;bitCount)</code></th>
<td class="colLast">
<div class="block">Converts a bit string to an array of bytes.</div>
</td>
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<tr class="altColor" id="i10">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toHexString()">toHexString</a></span>()</code></th>
<td class="colLast">
<div class="block">Converts this bit string to a hex string, such as "7AB".</div>
</td>
</tr>
<tr class="rowColor" id="i11">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
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<h3><a id="&lt;init&gt;(java.lang.String,int)">BitString</a></h3>
<div class="memberSignature"><span class="modifiers">protected</span>&nbsp;<span class="memberName">BitString</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;bits,
int&nbsp;bitCount)</span></div>
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<h3><a id="createFromHexString(java.lang.String)">createFromHexString</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType"><a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></span>&nbsp;<span class="memberName">createFromHexString</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</span></div>
<div class="block">Creates a BitString representation out of a Hex String. Initial zeros are
be preserved. Hex String is defined in the SQL standard to be a string
with odd number of hex digits. An even number of hex digits is in the
standard a Binary String.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>s</code> - a string, in hex notation</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/NumberFormatException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NumberFormatException</a></code> - if <code>s</code> is invalid.</dd>
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<h3><a id="createFromBitString(java.lang.String)">createFromBitString</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType"><a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></span>&nbsp;<span class="memberName">createFromBitString</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;s)</span></div>
<div class="block">Creates a BitString representation out of a Bit String. Initial zeros are
be preserved.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>s</code> - a string of 0s and 1s.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/NumberFormatException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NumberFormatException</a></code> - if <code>s</code> is invalid.</dd>
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<h3><a id="toString()">toString</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span>&nbsp;<span class="memberName">toString</span>()</div>
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<h3><a id="hashCode()">hashCode</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">int</span>&nbsp;<span class="memberName">hashCode</span>()</div>
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<h3><a id="equals(java.lang.Object)">equals</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">boolean</span>&nbsp;<span class="memberName">equals</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>&nbsp;o)</span></div>
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<h3><a id="getBitCount()">getBitCount</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">int</span>&nbsp;<span class="memberName">getBitCount</span>()</div>
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<h3><a id="getAsByteArray()">getAsByteArray</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">byte[]</span>&nbsp;<span class="memberName">getAsByteArray</span>()</div>
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<h3><a id="toBitString()">toBitString</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span>&nbsp;<span class="memberName">toBitString</span>()</div>
<div class="block">Returns this bit string as a bit string, such as "10110".</div>
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<h3><a id="toHexString()">toHexString</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span>&nbsp;<span class="memberName">toHexString</span>()</div>
<div class="block">Converts this bit string to a hex string, such as "7AB".</div>
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<h3><a id="toByteArrayFromBitString(java.lang.String,int)">toByteArrayFromBitString</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType">byte[]</span>&nbsp;<span class="memberName">toByteArrayFromBitString</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;bits,
int&nbsp;bitCount)</span></div>
<div class="block">Converts a bit string to an array of bytes.</div>
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<h3><a id="concat(java.util.List)">concat</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType"><a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></span>&nbsp;<span class="memberName">concat</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a>&lt;<a href="BitString.html" title="class in org.apache.calcite.util">BitString</a>&gt;&nbsp;args)</span></div>
<div class="block">Concatenates some BitStrings. Concatenates all at once, not pairwise, to
avoid string copies.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>args</code> - BitString[]</dd>
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<h3><a id="createFromBytes(byte[])">createFromBytes</a></h3>
<div class="memberSignature"><span class="modifiers">public static</span>&nbsp;<span class="returnType"><a href="BitString.html" title="class in org.apache.calcite.util">BitString</a></span>&nbsp;<span class="memberName">createFromBytes</span>&#8203;(<span class="arguments">byte[]&nbsp;bytes)</span></div>
<div class="block">Creates a BitString from an array of bytes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>bytes</code> - Bytes</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>BitString</dd>
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