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91org.apache.hadoop.mapred.lib.aggregate</FONT>
92<BR>
93Class UniqValueCount</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.mapred.lib.aggregate.UniqValueCount</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>UniqValueCount</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/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></DL>
104</PRE>
105
106<P>
107This class implements a value aggregator that dedupes a sequence of objects.
108<P>
109
110<P>
111<HR>
112
113<P>
114
115<!-- ======== CONSTRUCTOR SUMMARY ======== -->
116
117<A NAME="constructor_summary"><!-- --></A>
118<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
119<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
120<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
121<B>Constructor Summary</B></FONT></TH>
122</TR>
123<TR BGCOLOR="white" CLASS="TableRowColor">
124<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#UniqValueCount()">UniqValueCount</A></B>()</CODE>
125
126<BR>
127&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;the default constructor</TD>
128</TR>
129<TR BGCOLOR="white" CLASS="TableRowColor">
130<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#UniqValueCount(long)">UniqValueCount</A></B>(long&nbsp;maxNum)</CODE>
131
132<BR>
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;constructor</TD>
134</TR>
135</TABLE>
136&nbsp;
137<!-- ========== METHOD SUMMARY =========== -->
138
139<A NAME="method_summary"><!-- --></A>
140<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
141<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
142<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
143<B>Method Summary</B></FONT></TH>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
147<CODE>&nbsp;void</CODE></FONT></TD>
148<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#addNextValue(java.lang.Object)">addNextValue</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;val)</CODE>
149
150<BR>
151&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;add a value to the aggregator</TD>
152</TR>
153<TR BGCOLOR="white" CLASS="TableRowColor">
154<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
155<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</A></CODE></FONT></TD>
156<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#getCombinerOutput()">getCombinerOutput</A></B>()</CODE>
157
158<BR>
159&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
160</TR>
161<TR BGCOLOR="white" CLASS="TableRowColor">
162<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
163<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
164<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#getReport()">getReport</A></B>()</CODE>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
171<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A></CODE></FONT></TD>
172<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#getUniqueItems()">getUniqueItems</A></B>()</CODE>
173
174<BR>
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
176</TR>
177<TR BGCOLOR="white" CLASS="TableRowColor">
178<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
179<CODE>&nbsp;void</CODE></FONT></TD>
180<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#reset()">reset</A></B>()</CODE>
181
182<BR>
183&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;reset the aggregator</TD>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
187<CODE>&nbsp;long</CODE></FONT></TD>
188<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UniqValueCount.html#setMaxItems(long)">setMaxItems</A></B>(long&nbsp;n)</CODE>
189
190<BR>
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the limit on the number of unique values</TD>
192</TR>
193</TABLE>
194&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
195<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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197<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>
198</TR>
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201</TR>
202</TABLE>
203&nbsp;
204<P>
205
206<!-- ========= CONSTRUCTOR DETAIL ======== -->
207
208<A NAME="constructor_detail"><!-- --></A>
209<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
210<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
211<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
212<B>Constructor Detail</B></FONT></TH>
213</TR>
214</TABLE>
215
216<A NAME="UniqValueCount()"><!-- --></A><H3>
217UniqValueCount</H3>
218<PRE>
219public <B>UniqValueCount</B>()</PRE>
220<DL>
221<DD>the default constructor
222<P>
223</DL>
224<HR>
225
226<A NAME="UniqValueCount(long)"><!-- --></A><H3>
227UniqValueCount</H3>
228<PRE>
229public <B>UniqValueCount</B>(long&nbsp;maxNum)</PRE>
230<DL>
231<DD>constructor
232<P>
233<DL>
234<DT><B>Parameters:</B><DD><CODE>maxNum</CODE> - the limit in the number of unique values to keep.</DL>
235</DL>
236
237<!-- ============ METHOD DETAIL ========== -->
238
239<A NAME="method_detail"><!-- --></A>
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242<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
243<B>Method Detail</B></FONT></TH>
244</TR>
245</TABLE>
246
247<A NAME="setMaxItems(long)"><!-- --></A><H3>
248setMaxItems</H3>
249<PRE>
250public long <B>setMaxItems</B>(long&nbsp;n)</PRE>
251<DL>
252<DD>Set the limit on the number of unique values
253<P>
254<DD><DL>
255</DL>
256</DD>
257<DD><DL>
258<DT><B>Parameters:</B><DD><CODE>n</CODE> - the desired limit on the number of unique values
259<DT><B>Returns:</B><DD>the new limit on the number of unique values</DL>
260</DD>
261</DL>
262<HR>
263
264<A NAME="addNextValue(java.lang.Object)"><!-- --></A><H3>
265addNextValue</H3>
266<PRE>
267public void <B>addNextValue</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;val)</PRE>
268<DL>
269<DD>add a value to the aggregator
270<P>
271<DD><DL>
272<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#addNextValue(java.lang.Object)">addNextValue</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
273</DD>
274<DD><DL>
275<DT><B>Parameters:</B><DD><CODE>val</CODE> - an object.</DL>
276</DD>
277</DL>
278<HR>
279
280<A NAME="getReport()"><!-- --></A><H3>
281getReport</H3>
282<PRE>
283public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getReport</B>()</PRE>
284<DL>
285<DD><DL>
286<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#getReport()">getReport</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
287</DD>
288<DD><DL>
289
290<DT><B>Returns:</B><DD>return the number of unique objects aggregated</DL>
291</DD>
292</DL>
293<HR>
294
295<A NAME="getUniqueItems()"><!-- --></A><H3>
296getUniqueItems</H3>
297<PRE>
298public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A> <B>getUniqueItems</B>()</PRE>
299<DL>
300<DD><DL>
301</DL>
302</DD>
303<DD><DL>
304
305<DT><B>Returns:</B><DD>the set of the unique objects</DL>
306</DD>
307</DL>
308<HR>
309
310<A NAME="reset()"><!-- --></A><H3>
311reset</H3>
312<PRE>
313public void <B>reset</B>()</PRE>
314<DL>
315<DD>reset the aggregator
316<P>
317<DD><DL>
318<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#reset()">reset</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
319</DD>
320<DD><DL>
321</DL>
322</DD>
323</DL>
324<HR>
325
326<A NAME="getCombinerOutput()"><!-- --></A><H3>
327getCombinerOutput</H3>
328<PRE>
329public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</A> <B>getCombinerOutput</B>()</PRE>
330<DL>
331<DD><DL>
332<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html#getCombinerOutput()">getCombinerOutput</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></DL>
333</DD>
334<DD><DL>
335
336<DT><B>Returns:</B><DD>return an array of the unique objects. The return value is
337         expected to be used by the a combiner.</DL>
338</DD>
339</DL>
340<!-- ========= END OF CLASS DATA ========= -->
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