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5<!-- Generated by javadoc (build 1.6.0_07) on Tue Sep 01 20:56:57 UTC 2009 -->
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7ValueAggregatorBaseDescriptor (Hadoop 0.20.1 API)
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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87<HR>
88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapred.lib.aggregate</FONT>
92<BR>
93Class ValueAggregatorBaseDescriptor</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.ValueAggregatorBaseDescriptor</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A></DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../../org/apache/hadoop/examples/AggregateWordCount.WordCountPlugInClass.html" title="class in org.apache.hadoop.examples">AggregateWordCount.WordCountPlugInClass</A>, <A HREF="../../../../../../org/apache/hadoop/examples/AggregateWordHistogram.AggregateWordHistogramPlugin.html" title="class in org.apache.hadoop.examples">AggregateWordHistogram.AggregateWordHistogramPlugin</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public class <B>ValueAggregatorBaseDescriptor</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/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A></DL>
107</PRE>
108
109<P>
110This class implements the common functionalities of
111 the subclasses of ValueAggregatorDescriptor class.
112<P>
113
114<P>
115<HR>
116
117<P>
118<!-- =========== FIELD SUMMARY =========== -->
119
120<A NAME="field_summary"><!-- --></A>
121<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
122<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
123<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
124<B>Field Summary</B></FONT></TH>
125</TR>
126<TR BGCOLOR="white" CLASS="TableRowColor">
127<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
128<CODE>static&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>
129<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#DOUBLE_VALUE_SUM">DOUBLE_VALUE_SUM</A></B></CODE>
130
131<BR>
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
133</TR>
134<TR BGCOLOR="white" CLASS="TableRowColor">
135<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
136<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>
137<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#inputFile">inputFile</A></B></CODE>
138
139<BR>
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
141</TR>
142<TR BGCOLOR="white" CLASS="TableRowColor">
143<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
144<CODE>static&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>
145<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MAX">LONG_VALUE_MAX</A></B></CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>static&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>
153<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MIN">LONG_VALUE_MIN</A></B></CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static&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>
161<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_SUM">LONG_VALUE_SUM</A></B></CODE>
162
163<BR>
164&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<CODE>static&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>
169<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MAX">STRING_VALUE_MAX</A></B></CODE>
170
171<BR>
172&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>static&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>
177<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MIN">STRING_VALUE_MIN</A></B></CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
181</TR>
182<TR BGCOLOR="white" CLASS="TableRowColor">
183<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
184<CODE>static&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>
185<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#UNIQ_VALUE_COUNT">UNIQ_VALUE_COUNT</A></B></CODE>
186
187<BR>
188&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
189</TR>
190<TR BGCOLOR="white" CLASS="TableRowColor">
191<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
192<CODE>static&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>
193<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#VALUE_HISTOGRAM">VALUE_HISTOGRAM</A></B></CODE>
194
195<BR>
196&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
197</TR>
198</TABLE>
199&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorDescriptor"><!-- --></A>
200<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
201<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
202<TH ALIGN="left"><B>Fields inherited from interface org.apache.hadoop.mapred.lib.aggregate.<A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A></B></TH>
203</TR>
204<TR BGCOLOR="white" CLASS="TableRowColor">
205<TD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html#ONE">ONE</A>, <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html#TYPE_SEPARATOR">TYPE_SEPARATOR</A></CODE></TD>
206</TR>
207</TABLE>
208&nbsp;
209<!-- ======== CONSTRUCTOR SUMMARY ======== -->
210
211<A NAME="constructor_summary"><!-- --></A>
212<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
213<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
214<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
215<B>Constructor Summary</B></FONT></TH>
216</TR>
217<TR BGCOLOR="white" CLASS="TableRowColor">
218<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#ValueAggregatorBaseDescriptor()">ValueAggregatorBaseDescriptor</A></B>()</CODE>
219
220<BR>
221&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
222</TR>
223</TABLE>
224&nbsp;
225<!-- ========== METHOD SUMMARY =========== -->
226
227<A NAME="method_summary"><!-- --></A>
228<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
229<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
230<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
231<B>Method Summary</B></FONT></TH>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
235<CODE>&nbsp;void</CODE></FONT></TD>
236<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
237
238<BR>
239&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;get the input file name.</TD>
240</TR>
241<TR BGCOLOR="white" CLASS="TableRowColor">
242<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
243<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;</CODE></FONT></TD>
244<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateEntry(java.lang.String, java.lang.String, org.apache.hadoop.io.Text)">generateEntry</A></B>(<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>&nbsp;type,
245              <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>&nbsp;id,
246              <A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;val)</CODE>
247
248<BR>
249&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
250</TR>
251<TR BGCOLOR="white" CLASS="TableRowColor">
252<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
253<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>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;&gt;</CODE></FONT></TD>
254<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateKeyValPairs(java.lang.Object, java.lang.Object)">generateKeyValPairs</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;key,
255                    <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>
256
257<BR>
258&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Generate 1 or 2 aggregation-id/value pairs for the given key/value pair.</TD>
259</TR>
260<TR BGCOLOR="white" CLASS="TableRowColor">
261<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
262<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A></CODE></FONT></TD>
263<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateValueAggregator(java.lang.String)">generateValueAggregator</A></B>(<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>&nbsp;type)</CODE>
264
265<BR>
266&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
267</TR>
268</TABLE>
269&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
270<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
271<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
272<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>
273</TR>
274<TR BGCOLOR="white" CLASS="TableRowColor">
275<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#equals(java.lang.Object)" title="class or interface in java.lang">equals</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#hashCode()" title="class or interface in java.lang">hashCode</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>
276</TR>
277</TABLE>
278&nbsp;
279<P>
280
281<!-- ============ FIELD DETAIL =========== -->
282
283<A NAME="field_detail"><!-- --></A>
284<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
285<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
286<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
287<B>Field Detail</B></FONT></TH>
288</TR>
289</TABLE>
290
291<A NAME="UNIQ_VALUE_COUNT"><!-- --></A><H3>
292UNIQ_VALUE_COUNT</H3>
293<PRE>
294public static final <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>UNIQ_VALUE_COUNT</B></PRE>
295<DL>
296<DL>
297<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.UNIQ_VALUE_COUNT">Constant Field Values</A></DL>
298</DL>
299<HR>
300
301<A NAME="LONG_VALUE_SUM"><!-- --></A><H3>
302LONG_VALUE_SUM</H3>
303<PRE>
304public static final <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>LONG_VALUE_SUM</B></PRE>
305<DL>
306<DL>
307<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_SUM">Constant Field Values</A></DL>
308</DL>
309<HR>
310
311<A NAME="DOUBLE_VALUE_SUM"><!-- --></A><H3>
312DOUBLE_VALUE_SUM</H3>
313<PRE>
314public static final <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>DOUBLE_VALUE_SUM</B></PRE>
315<DL>
316<DL>
317<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.DOUBLE_VALUE_SUM">Constant Field Values</A></DL>
318</DL>
319<HR>
320
321<A NAME="VALUE_HISTOGRAM"><!-- --></A><H3>
322VALUE_HISTOGRAM</H3>
323<PRE>
324public static final <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>VALUE_HISTOGRAM</B></PRE>
325<DL>
326<DL>
327<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.VALUE_HISTOGRAM">Constant Field Values</A></DL>
328</DL>
329<HR>
330
331<A NAME="LONG_VALUE_MAX"><!-- --></A><H3>
332LONG_VALUE_MAX</H3>
333<PRE>
334public static final <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>LONG_VALUE_MAX</B></PRE>
335<DL>
336<DL>
337<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_MAX">Constant Field Values</A></DL>
338</DL>
339<HR>
340
341<A NAME="LONG_VALUE_MIN"><!-- --></A><H3>
342LONG_VALUE_MIN</H3>
343<PRE>
344public static final <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>LONG_VALUE_MIN</B></PRE>
345<DL>
346<DL>
347<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.LONG_VALUE_MIN">Constant Field Values</A></DL>
348</DL>
349<HR>
350
351<A NAME="STRING_VALUE_MAX"><!-- --></A><H3>
352STRING_VALUE_MAX</H3>
353<PRE>
354public static final <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>STRING_VALUE_MAX</B></PRE>
355<DL>
356<DL>
357<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MAX">Constant Field Values</A></DL>
358</DL>
359<HR>
360
361<A NAME="STRING_VALUE_MIN"><!-- --></A><H3>
362STRING_VALUE_MIN</H3>
363<PRE>
364public static final <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>STRING_VALUE_MIN</B></PRE>
365<DL>
366<DL>
367<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MIN">Constant Field Values</A></DL>
368</DL>
369<HR>
370
371<A NAME="inputFile"><!-- --></A><H3>
372inputFile</H3>
373<PRE>
374public <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>inputFile</B></PRE>
375<DL>
376<DL>
377</DL>
378</DL>
379
380<!-- ========= CONSTRUCTOR DETAIL ======== -->
381
382<A NAME="constructor_detail"><!-- --></A>
383<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
384<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
385<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
386<B>Constructor Detail</B></FONT></TH>
387</TR>
388</TABLE>
389
390<A NAME="ValueAggregatorBaseDescriptor()"><!-- --></A><H3>
391ValueAggregatorBaseDescriptor</H3>
392<PRE>
393public <B>ValueAggregatorBaseDescriptor</B>()</PRE>
394<DL>
395</DL>
396
397<!-- ============ METHOD DETAIL ========== -->
398
399<A NAME="method_detail"><!-- --></A>
400<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
401<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
402<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
403<B>Method Detail</B></FONT></TH>
404</TR>
405</TABLE>
406
407<A NAME="generateEntry(java.lang.String, java.lang.String, org.apache.hadoop.io.Text)"><!-- --></A><H3>
408generateEntry</H3>
409<PRE>
410public static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt; <B>generateEntry</B>(<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>&nbsp;type,
411                                                 <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>&nbsp;id,
412                                                 <A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;val)</PRE>
413<DL>
414<DD><DL>
415</DL>
416</DD>
417<DD><DL>
418<DT><B>Parameters:</B><DD><CODE>type</CODE> - the aggregation type<DD><CODE>id</CODE> - the aggregation id<DD><CODE>val</CODE> - the val associated with the id to be aggregated
419<DT><B>Returns:</B><DD>an Entry whose key is the aggregation id prefixed with
420 the aggregation type.</DL>
421</DD>
422</DL>
423<HR>
424
425<A NAME="generateValueAggregator(java.lang.String)"><!-- --></A><H3>
426generateValueAggregator</H3>
427<PRE>
428public static <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregator</A> <B>generateValueAggregator</B>(<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>&nbsp;type)</PRE>
429<DL>
430<DD><DL>
431</DL>
432</DD>
433<DD><DL>
434<DT><B>Parameters:</B><DD><CODE>type</CODE> - the aggregation type
435<DT><B>Returns:</B><DD>a value aggregator of the given type.</DL>
436</DD>
437</DL>
438<HR>
439
440<A NAME="generateKeyValPairs(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
441generateKeyValPairs</H3>
442<PRE>
443public <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>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</A>&lt;<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>,<A HREF="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&gt;&gt; <B>generateKeyValPairs</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;key,
444                                                           <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>
445<DL>
446<DD>Generate 1 or 2 aggregation-id/value pairs for the given key/value pair.
447 The first id will be of type LONG_VALUE_SUM, with "record_count" as
448 its aggregation id. If the input is a file split,
449 the second id of the same type will be generated too, with the file name
450 as its aggregation id. This achieves the behavior of counting the total number
451 of records in the input data, and the number of records in each input file.
452<P>
453<DD><DL>
454<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html#generateKeyValPairs(java.lang.Object, java.lang.Object)">generateKeyValPairs</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A></CODE></DL>
455</DD>
456<DD><DL>
457<DT><B>Parameters:</B><DD><CODE>key</CODE> - input key<DD><CODE>val</CODE> - input value
458<DT><B>Returns:</B><DD>a list of aggregation id/value pairs. An aggregation id encodes an
459         aggregation type which is used to guide the way to aggregate the
460         value in the reduce/combiner phrase of an Aggregate based job.</DL>
461</DD>
462</DL>
463<HR>
464
465<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
466configure</H3>
467<PRE>
468public void <B>configure</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
469<DL>
470<DD>get the input file name.
471<P>
472<DD><DL>
473<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A></CODE> in interface <CODE><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A></CODE></DL>
474</DD>
475<DD><DL>
476<DT><B>Parameters:</B><DD><CODE>job</CODE> - a job configuration object</DL>
477</DD>
478</DL>
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