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91org.apache.hadoop.examples</FONT>
92<BR>
93Class AggregateWordCount.WordCountPlugInClass</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 "><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.examples.AggregateWordCount.WordCountPlugInClass</B>
98</PRE>
99<DL>
100<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>
101</DL>
102<DL>
103<DT><B>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/examples/AggregateWordCount.html" title="class in org.apache.hadoop.examples">AggregateWordCount</A></DD>
104</DL>
105<HR>
106<DL>
107<DT><PRE>public static class <B>AggregateWordCount.WordCountPlugInClass</B><DT>extends <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorBaseDescriptor</A></DL>
108</PRE>
109
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120<B>Field Summary</B></FONT></TH>
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122</TABLE>
123&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor"><!-- --></A>
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126<TH ALIGN="left"><B>Fields inherited from class org.apache.hadoop.mapred.lib.aggregate.<A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorBaseDescriptor</A></B></TH>
127</TR>
128<TR BGCOLOR="white" CLASS="TableRowColor">
129<TD><CODE><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#DOUBLE_VALUE_SUM">DOUBLE_VALUE_SUM</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#inputFile">inputFile</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MAX">LONG_VALUE_MAX</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MIN">LONG_VALUE_MIN</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_SUM">LONG_VALUE_SUM</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MAX">STRING_VALUE_MAX</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MIN">STRING_VALUE_MIN</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#UNIQ_VALUE_COUNT">UNIQ_VALUE_COUNT</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#VALUE_HISTOGRAM">VALUE_HISTOGRAM</A></CODE></TD>
130</TR>
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135<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>
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140</TABLE>
141&nbsp;
142<!-- ======== CONSTRUCTOR SUMMARY ======== -->
143
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147<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
148<B>Constructor Summary</B></FONT></TH>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/AggregateWordCount.WordCountPlugInClass.html#AggregateWordCount.WordCountPlugInClass()">AggregateWordCount.WordCountPlugInClass</A></B>()</CODE>
152
153<BR>
154&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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156</TABLE>
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164<B>Method Summary</B></FONT></TH>
165</TR>
166<TR BGCOLOR="white" CLASS="TableRowColor">
167<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
168<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>
169<TD><CODE><B><A HREF="../../../../org/apache/hadoop/examples/AggregateWordCount.WordCountPlugInClass.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,
170                    <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>
171
172<BR>
173&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>
174</TR>
175</TABLE>
176&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor"><!-- --></A>
177<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
178<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
179<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.mapred.lib.aggregate.<A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorBaseDescriptor</A></B></TH>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD><CODE><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#configure(org.apache.hadoop.mapred.JobConf)">configure</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateEntry(java.lang.String, java.lang.String, org.apache.hadoop.io.Text)">generateEntry</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateValueAggregator(java.lang.String)">generateValueAggregator</A></CODE></TD>
183</TR>
184</TABLE>
185&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
186<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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188<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>
189</TR>
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192</TR>
193</TABLE>
194&nbsp;
195<P>
196
197<!-- ========= CONSTRUCTOR DETAIL ======== -->
198
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200<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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202<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
203<B>Constructor Detail</B></FONT></TH>
204</TR>
205</TABLE>
206
207<A NAME="AggregateWordCount.WordCountPlugInClass()"><!-- --></A><H3>
208AggregateWordCount.WordCountPlugInClass</H3>
209<PRE>
210public <B>AggregateWordCount.WordCountPlugInClass</B>()</PRE>
211<DL>
212</DL>
213
214<!-- ============ METHOD DETAIL ========== -->
215
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220<B>Method Detail</B></FONT></TH>
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222</TABLE>
223
224<A NAME="generateKeyValPairs(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
225generateKeyValPairs</H3>
226<PRE>
227public <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,
228                                                           <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>
229<DL>
230<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateKeyValPairs(java.lang.Object, java.lang.Object)">ValueAggregatorBaseDescriptor</A></CODE></B></DD>
231<DD>Generate 1 or 2 aggregation-id/value pairs for the given key/value pair.
232 The first id will be of type LONG_VALUE_SUM, with "record_count" as
233 its aggregation id. If the input is a file split,
234 the second id of the same type will be generated too, with the file name
235 as its aggregation id. This achieves the behavior of counting the total number
236 of records in the input data, and the number of records in each input file.
237<P>
238<DD><DL>
239<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><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateKeyValPairs(java.lang.Object, java.lang.Object)">generateKeyValPairs</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorBaseDescriptor</A></CODE></DL>
240</DD>
241<DD><DL>
242<DT><B>Parameters:</B><DD><CODE>key</CODE> - input key<DD><CODE>val</CODE> - input value
243<DT><B>Returns:</B><DD>a list of aggregation id/value pairs. An aggregation id encodes an
244         aggregation type which is used to guide the way to aggregate the
245         value in the reduce/combiner phrase of an Aggregate based job.</DL>
246</DD>
247</DL>
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