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7UserDefinedValueAggregatorDescriptor (Hadoop 0.20.1 API)
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91org.apache.hadoop.mapred.lib.aggregate</FONT>
92<BR>
93Class UserDefinedValueAggregatorDescriptor</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.UserDefinedValueAggregatorDescriptor</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<HR>
102<DL>
103<DT><PRE>public class <B>UserDefinedValueAggregatorDescriptor</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>
104</PRE>
105
106<P>
107This class implements a wrapper for a user defined value aggregator descriptor.
108 It servs two functions: One is to create an object of ValueAggregatorDescriptor from the
109 name of a user defined class that may be dynamically loaded. The other is to
110 deligate inviokations of generateKeyValPairs function to the created object.
111<P>
112
113<P>
114<HR>
115
116<P>
117<!-- =========== FIELD SUMMARY =========== -->
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122<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
123<B>Field Summary</B></FONT></TH>
124</TR>
125</TABLE>
126&nbsp;<A NAME="fields_inherited_from_class_org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorDescriptor"><!-- --></A>
127<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
128<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
129<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>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<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>
133</TR>
134</TABLE>
135&nbsp;
136<!-- ======== CONSTRUCTOR SUMMARY ======== -->
137
138<A NAME="constructor_summary"><!-- --></A>
139<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
140<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
141<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
142<B>Constructor Summary</B></FONT></TH>
143</TR>
144<TR BGCOLOR="white" CLASS="TableRowColor">
145<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UserDefinedValueAggregatorDescriptor.html#UserDefinedValueAggregatorDescriptor(java.lang.String, org.apache.hadoop.mapred.JobConf)">UserDefinedValueAggregatorDescriptor</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;className,
146                                     <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</CODE>
147
148<BR>
149&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
150</TR>
151</TABLE>
152&nbsp;
153<!-- ========== METHOD SUMMARY =========== -->
154
155<A NAME="method_summary"><!-- --></A>
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157<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
158<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
159<B>Method Summary</B></FONT></TH>
160</TR>
161<TR BGCOLOR="white" CLASS="TableRowColor">
162<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
163<CODE>&nbsp;void</CODE></FONT></TD>
164<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UserDefinedValueAggregatorDescriptor.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>
165
166<BR>
167&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Do nothing.</TD>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
171<CODE>static&nbsp;<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></FONT></TD>
172<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UserDefinedValueAggregatorDescriptor.html#createInstance(java.lang.String)">createInstance</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;className)</CODE>
173
174<BR>
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an instance of the given class</TD>
176</TR>
177<TR BGCOLOR="white" CLASS="TableRowColor">
178<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
179<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>
180<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UserDefinedValueAggregatorDescriptor.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,
181                    <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>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Generate a list of aggregation-id/value pairs for the given key/value pairs
185   by delegating the invocation to the real object.</TD>
186</TR>
187<TR BGCOLOR="white" CLASS="TableRowColor">
188<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
189<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>
190<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/UserDefinedValueAggregatorDescriptor.html#toString()">toString</A></B>()</CODE>
191
192<BR>
193&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
194</TR>
195</TABLE>
196&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
197<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
198<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
199<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>
200</TR>
201<TR BGCOLOR="white" CLASS="TableRowColor">
202<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#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>
203</TR>
204</TABLE>
205&nbsp;
206<P>
207
208<!-- ========= CONSTRUCTOR DETAIL ======== -->
209
210<A NAME="constructor_detail"><!-- --></A>
211<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
212<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
213<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
214<B>Constructor Detail</B></FONT></TH>
215</TR>
216</TABLE>
217
218<A NAME="UserDefinedValueAggregatorDescriptor(java.lang.String, org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
219UserDefinedValueAggregatorDescriptor</H3>
220<PRE>
221public <B>UserDefinedValueAggregatorDescriptor</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;className,
222                                            <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
223<DL>
224<DL>
225<DT><B>Parameters:</B><DD><CODE>className</CODE> - the class name of the user defined descriptor class<DD><CODE>job</CODE> - a configure object used for decriptor configuration</DL>
226</DL>
227
228<!-- ============ METHOD DETAIL ========== -->
229
230<A NAME="method_detail"><!-- --></A>
231<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
232<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
233<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
234<B>Method Detail</B></FONT></TH>
235</TR>
236</TABLE>
237
238<A NAME="createInstance(java.lang.String)"><!-- --></A><H3>
239createInstance</H3>
240<PRE>
241public static <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>createInstance</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;className)</PRE>
242<DL>
243<DD>Create an instance of the given class
244<P>
245<DD><DL>
246</DL>
247</DD>
248<DD><DL>
249<DT><B>Parameters:</B><DD><CODE>className</CODE> - the name of the class
250<DT><B>Returns:</B><DD>a dynamically created instance of the given class</DL>
251</DD>
252</DL>
253<HR>
254
255<A NAME="generateKeyValPairs(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
256generateKeyValPairs</H3>
257<PRE>
258public <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,
259                                                           <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>
260<DL>
261<DD>Generate a list of aggregation-id/value pairs for the given key/value pairs
262   by delegating the invocation to the real object.
263<P>
264<DD><DL>
265<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>
266</DD>
267<DD><DL>
268<DT><B>Parameters:</B><DD><CODE>key</CODE> - input key<DD><CODE>val</CODE> - input value
269<DT><B>Returns:</B><DD>a list of aggregation id/value pairs. An aggregation id encodes an
270         aggregation type which is used to guide the way to aggregate the
271         value in the reduce/combiner phrase of an Aggregate based job.</DL>
272</DD>
273</DL>
274<HR>
275
276<A NAME="toString()"><!-- --></A><H3>
277toString</H3>
278<PRE>
279public <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>toString</B>()</PRE>
280<DL>
281<DD><DL>
282<DT><B>Overrides:</B><DD><CODE><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></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>
283</DD>
284<DD><DL>
285
286<DT><B>Returns:</B><DD>the string representation of this object.</DL>
287</DD>
288</DL>
289<HR>
290
291<A NAME="configure(org.apache.hadoop.mapred.JobConf)"><!-- --></A><H3>
292configure</H3>
293<PRE>
294public void <B>configure</B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job)</PRE>
295<DL>
296<DD>Do nothing.
297<P>
298<DD><DL>
299<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>
300</DD>
301<DD><DL>
302<DT><B>Parameters:</B><DD><CODE>job</CODE> - a JobConf object that may contain the information that can be used
303          to configure the object.</DL>
304</DD>
305</DL>
306<!-- ========= END OF CLASS DATA ========= -->
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319  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
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