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| <div class="subTitle">org.apache.hadoop.io</div> |
| <h2 title="Class WritableComparator" class="title">Class WritableComparator</h2> |
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| <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a>, <a href="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition">KeyFieldBasedComparator</a>, <a href="../../../../org/apache/hadoop/record/RecordComparator.html" title="class in org.apache.hadoop.record">RecordComparator</a></dd> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">WritableComparator</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/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></pre> |
| <div class="block">A Comparator for <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a>s. |
| |
| <p>This base implementation uses the natural ordering. To define alternate |
| orderings, override <a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-org.apache.hadoop.io.WritableComparable-org.apache.hadoop.io.WritableComparable-"><code>compare(WritableComparable,WritableComparable)</code></a>. |
| |
| <p>One may optimize compare-intensive operations by overriding |
| <a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-byte:A-int-int-byte:A-int-int-"><code>compare(byte[],int,int,byte[],int,int)</code></a>. Static utility methods are |
| provided to assist in optimized implementations of this method.</div> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier</th> |
| <th class="colLast" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator--">WritableComparator</a></span>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator-java.lang.Class-">WritableComparator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass)</code> |
| <div class="block">Construct for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> implementation.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator-java.lang.Class-boolean-">WritableComparator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass, |
| boolean createInstances)</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#WritableComparator-java.lang.Class-org.apache.hadoop.conf.Configuration-boolean-">WritableComparator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| boolean createInstances)</code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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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="t2" class="tableTab"><span><a href="javascript:show(2);">Instance 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>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-byte:A-int-int-byte:A-int-int-">compare</a></span>(byte[] b1, |
| int s1, |
| int l1, |
| byte[] b2, |
| int s2, |
| int l2)</code> |
| <div class="block">Optimization hook.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-java.lang.Object-java.lang.Object-">compare</a></span>(<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> a, |
| <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> b)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-org.apache.hadoop.io.WritableComparable-org.apache.hadoop.io.WritableComparable-">compare</a></span>(<a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a> a, |
| <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a> b)</code> |
| <div class="block">Compare two WritableComparables.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#compareBytes-byte:A-int-int-byte:A-int-int-">compareBytes</a></span>(byte[] b1, |
| int s1, |
| int l1, |
| byte[] b2, |
| int s2, |
| int l2)</code> |
| <div class="block">Lexicographic order of binary data.</div> |
| </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/hadoop/io/WritableComparator.html#define-java.lang.Class-org.apache.hadoop.io.WritableComparator-">define</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> c, |
| <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a> comparator)</code> |
| <div class="block">Register an optimized comparator for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> |
| implementation.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#get-java.lang.Class-">get</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> c)</code> |
| <div class="block">For backwards compatibility.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#get-java.lang.Class-org.apache.hadoop.conf.Configuration-">get</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> c, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">Get a comparator for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> implementation.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#getConf--">getConf</a></span>()</code> |
| <div class="block">Return the configuration used by this object.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#getKeyClass--">getKeyClass</a></span>()</code> |
| <div class="block">Returns the WritableComparable implementation class.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes-byte:A-int-">hashBytes</a></span>(byte[] bytes, |
| int length)</code> |
| <div class="block">Compute hash for binary data.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#hashBytes-byte:A-int-int-">hashBytes</a></span>(byte[] bytes, |
| int offset, |
| int length)</code> |
| <div class="block">Compute hash for binary data.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#newKey--">newKey</a></span>()</code> |
| <div class="block">Construct a new <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> instance.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readDouble-byte:A-int-">readDouble</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Parse a double from a byte array.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>static float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readFloat-byte:A-int-">readFloat</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Parse a float from a byte array.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readInt-byte:A-int-">readInt</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Parse an integer from a byte array.</div> |
| </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readLong-byte:A-int-">readLong</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Parse a long from a byte array.</div> |
| </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readUnsignedShort-byte:A-int-">readUnsignedShort</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Parse an unsigned short from a byte array.</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readVInt-byte:A-int-">readVInt</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Reads a zero-compressed encoded integer from a byte array and returns it.</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#readVLong-byte:A-int-">readVLong</a></span>(byte[] bytes, |
| int start)</code> |
| <div class="block">Reads a zero-compressed encoded long from a byte array and returns it.</div> |
| </td> |
| </tr> |
| <tr id="i19" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/io/WritableComparator.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">Set the configuration to be used by this object.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <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>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
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| <h3>Methods inherited from interface java.util.<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-" title="class or interface in java.util">comparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">comparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">comparingDouble</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">comparingInt</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#comparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">comparingLong</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.util">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#naturalOrder--" title="class or interface in java.util">naturalOrder</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#nullsFirst-java.util.Comparator-" title="class or interface in java.util">nullsFirst</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#nullsLast-java.util.Comparator-" title="class or interface in java.util">nullsLast</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#reversed--" title="class or interface in java.util">reversed</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#reverseOrder--" title="class or interface in java.util">reverseOrder</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparing-java.util.function.Function-java.util.Comparator-" title="class or interface in java.util">thenComparing</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingDouble-java.util.function.ToDoubleFunction-" title="class or interface in java.util">thenComparingDouble</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingInt-java.util.function.ToIntFunction-" title="class or interface in java.util">thenComparingInt</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#thenComparingLong-java.util.function.ToLongFunction-" title="class or interface in java.util">thenComparingLong</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="WritableComparator--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>WritableComparator</h4> |
| <pre>protected WritableComparator()</pre> |
| </li> |
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| <a name="WritableComparator-java.lang.Class-"> |
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| <ul class="blockList"> |
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| <h4>WritableComparator</h4> |
| <pre>protected WritableComparator(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass)</pre> |
| <div class="block">Construct for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> implementation.</div> |
| </li> |
| </ul> |
| <a name="WritableComparator-java.lang.Class-boolean-"> |
| <!-- --> |
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| <ul class="blockList"> |
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| <h4>WritableComparator</h4> |
| <pre>protected WritableComparator(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass, |
| boolean createInstances)</pre> |
| </li> |
| </ul> |
| <a name="WritableComparator-java.lang.Class-org.apache.hadoop.conf.Configuration-boolean-"> |
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| <ul class="blockListLast"> |
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| <h4>WritableComparator</h4> |
| <pre>protected WritableComparator(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> keyClass, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| boolean createInstances)</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
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| <h3>Method Detail</h3> |
| <a name="get-java.lang.Class-"> |
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| </a> |
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| <h4>get</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a> get(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> c)</pre> |
| <div class="block">For backwards compatibility.</div> |
| </li> |
| </ul> |
| <a name="get-java.lang.Class-org.apache.hadoop.conf.Configuration-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>get</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a> get(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> c, |
| <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
| <div class="block">Get a comparator for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> implementation.</div> |
| </li> |
| </ul> |
| <a name="setConf-org.apache.hadoop.conf.Configuration-"> |
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| <h4>setConf</h4> |
| <pre>public void setConf(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">Configurable</a></code></span></div> |
| <div class="block">Set the configuration to be used by this object.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code> in interface <code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration to be used</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getConf--"> |
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| <h4>getConf</h4> |
| <pre>public <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> getConf()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">Configurable</a></code></span></div> |
| <div class="block">Return the configuration used by this object.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a></code> in interface <code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Configuration</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="define-java.lang.Class-org.apache.hadoop.io.WritableComparator-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>define</h4> |
| <pre>public static void define(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> c, |
| <a href="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</a> comparator)</pre> |
| <div class="block">Register an optimized comparator for a <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> |
| implementation. Comparators registered with this method must be |
| thread-safe.</div> |
| </li> |
| </ul> |
| <a name="getKeyClass--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getKeyClass</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a>> getKeyClass()</pre> |
| <div class="block">Returns the WritableComparable implementation class.</div> |
| </li> |
| </ul> |
| <a name="newKey--"> |
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| </a> |
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| <h4>newKey</h4> |
| <pre>public <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a> newKey()</pre> |
| <div class="block">Construct a new <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a> instance.</div> |
| </li> |
| </ul> |
| <a name="compare-byte:A-int-int-byte:A-int-int-"> |
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| </a> |
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| <h4>compare</h4> |
| <pre>public int compare(byte[] b1, |
| int s1, |
| int l1, |
| byte[] b2, |
| int s2, |
| int l2)</pre> |
| <div class="block">Optimization hook. Override this to make SequenceFile.Sorter's scream. |
| |
| <p>The default implementation reads the data into two <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io"><code>WritableComparable</code></a>s (using <a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-"><code>Writable.readFields(DataInput)</code></a>, then calls <a href="../../../../org/apache/hadoop/io/WritableComparator.html#compare-org.apache.hadoop.io.WritableComparable-org.apache.hadoop.io.WritableComparable-"><code>compare(WritableComparable,WritableComparable)</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/io/RawComparator.html#compare-byte:A-int-int-byte:A-int-int-">compare</a></code> in interface <code><a href="../../../../org/apache/hadoop/io/RawComparator.html" title="interface in org.apache.hadoop.io">RawComparator</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>b1</code> - The first byte array.</dd> |
| <dd><code>s1</code> - The position index in b1. The object under comparison's starting index.</dd> |
| <dd><code>l1</code> - The length of the object in b1.</dd> |
| <dd><code>b2</code> - The second byte array.</dd> |
| <dd><code>s2</code> - The position index in b2. The object under comparison's starting index.</dd> |
| <dd><code>l2</code> - The length of the object under comparison in b2.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>An integer result of the comparison.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="compare-org.apache.hadoop.io.WritableComparable-org.apache.hadoop.io.WritableComparable-"> |
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| </a> |
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| <h4>compare</h4> |
| <pre>public int compare(<a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a> a, |
| <a href="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</a> b)</pre> |
| <div class="block">Compare two WritableComparables. |
| |
| <p> The default implementation uses the natural ordering, calling <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true#compareTo-T-" title="class or interface in java.lang"><code>Comparable.compareTo(Object)</code></a>.</div> |
| </li> |
| </ul> |
| <a name="compare-java.lang.Object-java.lang.Object-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>compare</h4> |
| <pre>public int compare(<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> a, |
| <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> b)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true#compare-T-T-" title="class or interface in java.util">compare</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="compareBytes-byte:A-int-int-byte:A-int-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>compareBytes</h4> |
| <pre>public static int compareBytes(byte[] b1, |
| int s1, |
| int l1, |
| byte[] b2, |
| int s2, |
| int l2)</pre> |
| <div class="block">Lexicographic order of binary data.</div> |
| </li> |
| </ul> |
| <a name="hashBytes-byte:A-int-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hashBytes</h4> |
| <pre>public static int hashBytes(byte[] bytes, |
| int offset, |
| int length)</pre> |
| <div class="block">Compute hash for binary data.</div> |
| </li> |
| </ul> |
| <a name="hashBytes-byte:A-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hashBytes</h4> |
| <pre>public static int hashBytes(byte[] bytes, |
| int length)</pre> |
| <div class="block">Compute hash for binary data.</div> |
| </li> |
| </ul> |
| <a name="readUnsignedShort-byte:A-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readUnsignedShort</h4> |
| <pre>public static int readUnsignedShort(byte[] bytes, |
| int start)</pre> |
| <div class="block">Parse an unsigned short from a byte array.</div> |
| </li> |
| </ul> |
| <a name="readInt-byte:A-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readInt</h4> |
| <pre>public static int readInt(byte[] bytes, |
| int start)</pre> |
| <div class="block">Parse an integer from a byte array.</div> |
| </li> |
| </ul> |
| <a name="readFloat-byte:A-int-"> |
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| </a> |
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| <h4>readFloat</h4> |
| <pre>public static float readFloat(byte[] bytes, |
| int start)</pre> |
| <div class="block">Parse a float from a byte array.</div> |
| </li> |
| </ul> |
| <a name="readLong-byte:A-int-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readLong</h4> |
| <pre>public static long readLong(byte[] bytes, |
| int start)</pre> |
| <div class="block">Parse a long from a byte array.</div> |
| </li> |
| </ul> |
| <a name="readDouble-byte:A-int-"> |
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| </a> |
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| <h4>readDouble</h4> |
| <pre>public static double readDouble(byte[] bytes, |
| int start)</pre> |
| <div class="block">Parse a double from a byte array.</div> |
| </li> |
| </ul> |
| <a name="readVLong-byte:A-int-"> |
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| <h4>readVLong</h4> |
| <pre>public static long readVLong(byte[] bytes, |
| int start) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Reads a zero-compressed encoded long from a byte array and returns it.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>bytes</code> - byte array with decode long</dd> |
| <dd><code>start</code> - starting index</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>deserialized long</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
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| </a> |
| <ul class="blockListLast"> |
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| <h4>readVInt</h4> |
| <pre>public static int readVInt(byte[] bytes, |
| int start) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Reads a zero-compressed encoded integer from a byte array and returns it.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>bytes</code> - byte array with the encoded integer</dd> |
| <dd><code>start</code> - start index</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>deserialized integer</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
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