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| <div class="subTitle">org.apache.mahout.math</div> |
| <h2 title="Class Varint" class="title">Class Varint</h2> |
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| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="http://docs.oracle.com/javase/7/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.mahout.math.Varint</li> |
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| <pre>public final class <span class="typeNameLabel">Varint</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block"><p>Encodes signed and unsigned values using a common variable-length |
| scheme, found for example in |
| <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html"> |
| Google's Protocol Buffers</a>. It uses fewer bytes to encode smaller values, |
| but will use slightly more bytes to encode large values.</p> |
| |
| <p>Signed values are further encoded using so-called zig-zag encoding |
| in order to make them "compatible" with variable-length encoding.</p></div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#readSignedVarInt-java.io.DataInput-">readSignedVarInt</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)</code> </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/mahout/math/Varint.html#readSignedVarLong-java.io.DataInput-">readSignedVarLong</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#readUnsignedVarInt-java.io.DataInput-">readUnsignedVarInt</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)</code> </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/mahout/math/Varint.html#readUnsignedVarLong-java.io.DataInput-">readUnsignedVarLong</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#writeSignedVarInt-int-java.io.DataOutput-">writeSignedVarInt</a></span>(int value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#writeSignedVarLong-long-java.io.DataOutput-">writeSignedVarLong</a></span>(long value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code> |
| <div class="block">Encodes a value using the variable-length encoding from |
| <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html"> |
| Google Protocol Buffers</a>.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#writeUnsignedVarInt-int-java.io.DataOutput-">writeUnsignedVarInt</a></span>(int value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/mahout/math/Varint.html#writeUnsignedVarLong-long-java.io.DataOutput-">writeUnsignedVarLong</a></span>(long value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out)</code> |
| <div class="block">Encodes a value using the variable-length encoding from |
| <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html"> |
| Google Protocol Buffers</a>.</div> |
| </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
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| <h3>Method Detail</h3> |
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| <h4>writeSignedVarLong</h4> |
| <pre>public static void writeSignedVarLong(long value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Encodes a value using the variable-length encoding from |
| <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html"> |
| Google Protocol Buffers</a>. It uses zig-zag encoding to efficiently |
| encode signed values. If values are known to be nonnegative, |
| <a href="../../../../org/apache/mahout/math/Varint.html#writeUnsignedVarLong-long-java.io.DataOutput-"><code>writeUnsignedVarLong(long, java.io.DataOutput)</code></a> should be used.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - value to encode</dd> |
| <dd><code>out</code> - to write bytes to</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| </dl> |
| </li> |
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| <h4>writeUnsignedVarLong</h4> |
| <pre>public static void writeUnsignedVarLong(long value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Encodes a value using the variable-length encoding from |
| <a href="http://code.google.com/apis/protocolbuffers/docs/encoding.html"> |
| Google Protocol Buffers</a>. Zig-zag is not used, so input must not be negative. |
| If values can be negative, use <a href="../../../../org/apache/mahout/math/Varint.html#writeSignedVarLong-long-java.io.DataOutput-"><code>writeSignedVarLong(long, java.io.DataOutput)</code></a> |
| instead. This method treats negative input as like a large unsigned value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - value to encode</dd> |
| <dd><code>out</code> - to write bytes to</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io"><code>DataOutput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| </dl> |
| </li> |
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| <h4>writeSignedVarInt</h4> |
| <pre>public static void writeSignedVarInt(int value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#writeSignedVarLong-long-java.io.DataOutput-"><code>writeSignedVarLong(long, java.io.DataOutput)</code></a></dd> |
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| <h4>writeUnsignedVarInt</h4> |
| <pre>public static void writeUnsignedVarInt(int value, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> out) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#writeUnsignedVarLong-long-java.io.DataOutput-"><code>writeUnsignedVarLong(long, java.io.DataOutput)</code></a></dd> |
| </dl> |
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| <h4>readSignedVarLong</h4> |
| <pre>public static long readSignedVarLong(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - to read bytes from</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>decode value</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if variable-length value does not terminate |
| after 9 bytes have been read</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#writeSignedVarLong-long-java.io.DataOutput-"><code>writeSignedVarLong(long, java.io.DataOutput)</code></a></dd> |
| </dl> |
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| <h4>readUnsignedVarLong</h4> |
| <pre>public static long readUnsignedVarLong(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>in</code> - to read bytes from</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>decode value</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if variable-length value does not terminate |
| after 9 bytes have been read</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#writeUnsignedVarLong-long-java.io.DataOutput-"><code>writeUnsignedVarLong(long, java.io.DataOutput)</code></a></dd> |
| </dl> |
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| <h4>readSignedVarInt</h4> |
| <pre>public static int readSignedVarInt(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if variable-length value does not terminate |
| after 5 bytes have been read</dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#readSignedVarLong-java.io.DataInput-"><code>readSignedVarLong(java.io.DataInput)</code></a></dd> |
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| <h4>readUnsignedVarInt</h4> |
| <pre>public static int readUnsignedVarInt(<a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a> in) |
| throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if variable-length value does not terminate |
| after 5 bytes have been read</dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if <a href="http://docs.oracle.com/javase/7/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><code>DataInput</code></a> throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io"><code>IOException</code></a></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/mahout/math/Varint.html#readUnsignedVarLong-java.io.DataInput-"><code>readUnsignedVarLong(java.io.DataInput)</code></a></dd> |
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