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6<TITLE>
7Key (Hadoop 0.20.1 API)
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86
87<HR>
88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.util.bloom</FONT>
92<BR>
93Class Key</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.util.bloom.Key</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;<A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html" title="class in org.apache.hadoop.util.bloom">Key</A>&gt;, <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;<A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html" title="class in org.apache.hadoop.util.bloom">Key</A>&gt;</DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>Key</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;<A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html" title="class in org.apache.hadoop.util.bloom">Key</A>&gt;</DL>
104</PRE>
105
106<P>
107The general behavior of a key that must be stored in a filter.
108<P>
109
110<P>
111<DL>
112<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/util/bloom/Filter.html" title="class in org.apache.hadoop.util.bloom"><CODE>The general behavior of a filter</CODE></A></DL>
113<HR>
114
115<P>
116
117<!-- ======== CONSTRUCTOR SUMMARY ======== -->
118
119<A NAME="constructor_summary"><!-- --></A>
120<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
121<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
122<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
123<B>Constructor Summary</B></FONT></TH>
124</TR>
125<TR BGCOLOR="white" CLASS="TableRowColor">
126<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#Key()">Key</A></B>()</CODE>
127
128<BR>
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default constructor - use with readFields</TD>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#Key(byte[])">Key</A></B>(byte[]&nbsp;value)</CODE>
133
134<BR>
135&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructor.</TD>
136</TR>
137<TR BGCOLOR="white" CLASS="TableRowColor">
138<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#Key(byte[], double)">Key</A></B>(byte[]&nbsp;value,
139    double&nbsp;weight)</CODE>
140
141<BR>
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructor.</TD>
143</TR>
144</TABLE>
145&nbsp;
146<!-- ========== METHOD SUMMARY =========== -->
147
148<A NAME="method_summary"><!-- --></A>
149<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
150<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
151<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
152<B>Method Summary</B></FONT></TH>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;int</CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#compareTo(org.apache.hadoop.util.bloom.Key)">compareTo</A></B>(<A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html" title="class in org.apache.hadoop.util.bloom">Key</A>&nbsp;other)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>&nbsp;boolean</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#equals(java.lang.Object)">equals</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&nbsp;o)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>&nbsp;byte[]</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#getBytes()">getBytes</A></B>()</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;double</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#getWeight()">getWeight</A></B>()</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;int</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#hashCode()">hashCode</A></B>()</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>&nbsp;void</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#incrementWeight()">incrementWeight</A></B>()</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Increments the weight of <i>this</i> key by one.</TD>
201</TR>
202<TR BGCOLOR="white" CLASS="TableRowColor">
203<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
204<CODE>&nbsp;void</CODE></FONT></TD>
205<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#incrementWeight(double)">incrementWeight</A></B>(double&nbsp;weight)</CODE>
206
207<BR>
208&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Increments the weight of <i>this</i> key with a specified value.</TD>
209</TR>
210<TR BGCOLOR="white" CLASS="TableRowColor">
211<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
212<CODE>&nbsp;void</CODE></FONT></TD>
213<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#readFields(java.io.DataInput)">readFields</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)</CODE>
214
215<BR>
216&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
217</TR>
218<TR BGCOLOR="white" CLASS="TableRowColor">
219<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
220<CODE>&nbsp;void</CODE></FONT></TD>
221<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#set(byte[], double)">set</A></B>(byte[]&nbsp;value,
222    double&nbsp;weight)</CODE>
223
224<BR>
225&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
226</TR>
227<TR BGCOLOR="white" CLASS="TableRowColor">
228<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
229<CODE>&nbsp;void</CODE></FONT></TD>
230<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/util/bloom/Key.html#write(java.io.DataOutput)">write</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)</CODE>
231
232<BR>
233&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
234</TR>
235</TABLE>
236&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
237<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
238<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
239<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
240</TR>
241<TR BGCOLOR="white" CLASS="TableRowColor">
242<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
243</TR>
244</TABLE>
245&nbsp;
246<P>
247
248<!-- ========= CONSTRUCTOR DETAIL ======== -->
249
250<A NAME="constructor_detail"><!-- --></A>
251<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
252<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
253<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
254<B>Constructor Detail</B></FONT></TH>
255</TR>
256</TABLE>
257
258<A NAME="Key()"><!-- --></A><H3>
259Key</H3>
260<PRE>
261public <B>Key</B>()</PRE>
262<DL>
263<DD>default constructor - use with readFields
264<P>
265</DL>
266<HR>
267
268<A NAME="Key(byte[])"><!-- --></A><H3>
269Key</H3>
270<PRE>
271public <B>Key</B>(byte[]&nbsp;value)</PRE>
272<DL>
273<DD>Constructor.
274 <p>
275 Builds a key with a default weight.
276<P>
277<DL>
278<DT><B>Parameters:</B><DD><CODE>value</CODE> - The byte value of <i>this</i> key.</DL>
279</DL>
280<HR>
281
282<A NAME="Key(byte[], double)"><!-- --></A><H3>
283Key</H3>
284<PRE>
285public <B>Key</B>(byte[]&nbsp;value,
286           double&nbsp;weight)</PRE>
287<DL>
288<DD>Constructor.
289 <p>
290 Builds a key with a specified weight.
291<P>
292<DL>
293<DT><B>Parameters:</B><DD><CODE>value</CODE> - The value of <i>this</i> key.<DD><CODE>weight</CODE> - The weight associated to <i>this</i> key.</DL>
294</DL>
295
296<!-- ============ METHOD DETAIL ========== -->
297
298<A NAME="method_detail"><!-- --></A>
299<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
300<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
301<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
302<B>Method Detail</B></FONT></TH>
303</TR>
304</TABLE>
305
306<A NAME="set(byte[], double)"><!-- --></A><H3>
307set</H3>
308<PRE>
309public void <B>set</B>(byte[]&nbsp;value,
310                double&nbsp;weight)</PRE>
311<DL>
312<DD><DL>
313</DL>
314</DD>
315<DD><DL>
316<DT><B>Parameters:</B><DD><CODE>value</CODE> - <DD><CODE>weight</CODE> - </DL>
317</DD>
318</DL>
319<HR>
320
321<A NAME="getBytes()"><!-- --></A><H3>
322getBytes</H3>
323<PRE>
324public byte[] <B>getBytes</B>()</PRE>
325<DL>
326<DD><DL>
327</DL>
328</DD>
329<DD><DL>
330
331<DT><B>Returns:</B><DD>byte[] The value of <i>this</i> key.</DL>
332</DD>
333</DL>
334<HR>
335
336<A NAME="getWeight()"><!-- --></A><H3>
337getWeight</H3>
338<PRE>
339public double <B>getWeight</B>()</PRE>
340<DL>
341<DD><DL>
342</DL>
343</DD>
344<DD><DL>
345
346<DT><B>Returns:</B><DD>Returns the weight associated to <i>this</i> key.</DL>
347</DD>
348</DL>
349<HR>
350
351<A NAME="incrementWeight(double)"><!-- --></A><H3>
352incrementWeight</H3>
353<PRE>
354public void <B>incrementWeight</B>(double&nbsp;weight)</PRE>
355<DL>
356<DD>Increments the weight of <i>this</i> key with a specified value.
357<P>
358<DD><DL>
359</DL>
360</DD>
361<DD><DL>
362<DT><B>Parameters:</B><DD><CODE>weight</CODE> - The increment.</DL>
363</DD>
364</DL>
365<HR>
366
367<A NAME="incrementWeight()"><!-- --></A><H3>
368incrementWeight</H3>
369<PRE>
370public void <B>incrementWeight</B>()</PRE>
371<DL>
372<DD>Increments the weight of <i>this</i> key by one.
373<P>
374<DD><DL>
375</DL>
376</DD>
377<DD><DL>
378</DL>
379</DD>
380</DL>
381<HR>
382
383<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
384equals</H3>
385<PRE>
386public boolean <B>equals</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>&nbsp;o)</PRE>
387<DL>
388<DD><DL>
389<DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></DL>
390</DD>
391<DD><DL>
392</DL>
393</DD>
394</DL>
395<HR>
396
397<A NAME="hashCode()"><!-- --></A><H3>
398hashCode</H3>
399<PRE>
400public int <B>hashCode</B>()</PRE>
401<DL>
402<DD><DL>
403<DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></CODE></DL>
404</DD>
405<DD><DL>
406</DL>
407</DD>
408</DL>
409<HR>
410
411<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
412write</H3>
413<PRE>
414public void <B>write</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)
415           throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
416<DL>
417<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">Writable</A></CODE></B></DD>
418<DD>Serialize the fields of this object to <code>out</code>.
419<P>
420<DD><DL>
421<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
422</DD>
423<DD><DL>
424<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
425<DT><B>Throws:</B>
426<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
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431<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
432readFields</H3>
433<PRE>
434public void <B>readFields</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)
435                throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
436<DL>
437<DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">Writable</A></CODE></B></DD>
438<DD>Deserialize the fields of this object from <code>in</code>. 
439 
440 <p>For efficiency, implementations should attempt to re-use storage in the
441 existing object where possible.</p>
442<P>
443<DD><DL>
444<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
445</DD>
446<DD><DL>
447<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
448<DT><B>Throws:</B>
449<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
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453
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455compareTo</H3>
456<PRE>
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459<DD><DL>
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