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7GenericWritable (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class GenericWritable</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.io.GenericWritable</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A>, <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public abstract class <B>GenericWritable</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/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></DL>
104</PRE>
105
106<P>
107A wrapper for Writable instances.
108 <p>
109 When two sequence files, which have same Key type but different Value
110 types, are mapped out to reduce, multiple Value types is not allowed.
111 In this case, this class can help you wrap instances with different types.
112 </p>
113 
114 <p>
115 Compared with <code>ObjectWritable</code>, this class is much more effective,
116 because <code>ObjectWritable</code> will append the class declaration as a String
117 into the output file in every Key-Value pair.
118 </p>
119 
120 <p>
121 Generic Writable implements <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><CODE>Configurable</CODE></A> interface, so that it will be
122 configured by the framework. The configuration is passed to the wrapped objects
123 implementing <A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf"><CODE>Configurable</CODE></A> interface <i>before deserialization</i>.
124 </p>
125 
126 how to use it: <br>
127 1. Write your own class, such as GenericObject, which extends GenericWritable.<br> 
128 2. Implements the abstract method <code>getTypes()</code>, defines
129    the classes which will be wrapped in GenericObject in application.
130    Attention: this classes defined in <code>getTypes()</code> method, must
131    implement <code>Writable</code> interface.
132 <br><br>
133 
134 The code looks like this:
135 <blockquote><pre>
136 public class GenericObject extends GenericWritable {
137 
138   private static Class[] CLASSES = {
139               ClassType1.class,
140               ClassType2.class,
141               ClassType3.class,
142               };
143
144   protected Class[] getTypes() {
145       return CLASSES;
146   }
147
148 }
149 </pre></blockquote>
150<P>
151
152<P>
153<DL>
154<DT><B>Since:</B></DT>
155  <DD>Nov 8, 2006</DD>
156</DL>
157<HR>
158
159<P>
160
161<!-- ======== CONSTRUCTOR SUMMARY ======== -->
162
163<A NAME="constructor_summary"><!-- --></A>
164<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
165<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
166<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
167<B>Constructor Summary</B></FONT></TH>
168</TR>
169<TR BGCOLOR="white" CLASS="TableRowColor">
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#GenericWritable()">GenericWritable</A></B>()</CODE>
171
172<BR>
173&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
174</TR>
175</TABLE>
176&nbsp;
177<!-- ========== METHOD SUMMARY =========== -->
178
179<A NAME="method_summary"><!-- --></A>
180<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
181<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
182<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
183<B>Method Summary</B></FONT></TH>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
187<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></FONT></TD>
188<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#get()">get</A></B>()</CODE>
189
190<BR>
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the wrapped instance.</TD>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
195<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD>
196<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#getConf()">getConf</A></B>()</CODE>
197
198<BR>
199&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the configuration used by this object.</TD>
200</TR>
201<TR BGCOLOR="white" CLASS="TableRowColor">
202<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
203<CODE>protected abstract &nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;[]</CODE></FONT></TD>
204<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#getTypes()">getTypes</A></B>()</CODE>
205
206<BR>
207&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return all classes that may be wrapped.</TD>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
211<CODE>&nbsp;void</CODE></FONT></TD>
212<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.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>
213
214<BR>
215&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
216</TR>
217<TR BGCOLOR="white" CLASS="TableRowColor">
218<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
219<CODE>&nbsp;void</CODE></FONT></TD>
220<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#set(org.apache.hadoop.io.Writable)">set</A></B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;obj)</CODE>
221
222<BR>
223&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the instance that is wrapped.</TD>
224</TR>
225<TR BGCOLOR="white" CLASS="TableRowColor">
226<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
227<CODE>&nbsp;void</CODE></FONT></TD>
228<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
229
230<BR>
231&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the configuration to be used by this object.</TD>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
235<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>
236<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.html#toString()">toString</A></B>()</CODE>
237
238<BR>
239&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
240</TR>
241<TR BGCOLOR="white" CLASS="TableRowColor">
242<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
243<CODE>&nbsp;void</CODE></FONT></TD>
244<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/GenericWritable.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>
245
246<BR>
247&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
248</TR>
249</TABLE>
250&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
251<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
252<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
253<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>
254</TR>
255<TR BGCOLOR="white" CLASS="TableRowColor">
256<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>
257</TR>
258</TABLE>
259&nbsp;
260<P>
261
262<!-- ========= CONSTRUCTOR DETAIL ======== -->
263
264<A NAME="constructor_detail"><!-- --></A>
265<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
266<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
267<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
268<B>Constructor Detail</B></FONT></TH>
269</TR>
270</TABLE>
271
272<A NAME="GenericWritable()"><!-- --></A><H3>
273GenericWritable</H3>
274<PRE>
275public <B>GenericWritable</B>()</PRE>
276<DL>
277</DL>
278
279<!-- ============ METHOD DETAIL ========== -->
280
281<A NAME="method_detail"><!-- --></A>
282<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
283<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
284<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
285<B>Method Detail</B></FONT></TH>
286</TR>
287</TABLE>
288
289<A NAME="set(org.apache.hadoop.io.Writable)"><!-- --></A><H3>
290set</H3>
291<PRE>
292public void <B>set</B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;obj)</PRE>
293<DL>
294<DD>Set the instance that is wrapped.
295<P>
296<DD><DL>
297</DL>
298</DD>
299<DD><DL>
300<DT><B>Parameters:</B><DD><CODE>obj</CODE> - </DL>
301</DD>
302</DL>
303<HR>
304
305<A NAME="get()"><!-- --></A><H3>
306get</H3>
307<PRE>
308public <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> <B>get</B>()</PRE>
309<DL>
310<DD>Return the wrapped instance.
311<P>
312<DD><DL>
313</DL>
314</DD>
315<DD><DL>
316</DL>
317</DD>
318</DL>
319<HR>
320
321<A NAME="toString()"><!-- --></A><H3>
322toString</H3>
323<PRE>
324public <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>
325<DL>
326<DD><DL>
327<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>
328</DD>
329<DD><DL>
330</DL>
331</DD>
332</DL>
333<HR>
334
335<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
336readFields</H3>
337<PRE>
338public 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)
339                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>
340<DL>
341<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">Writable</A></CODE></B></DD>
342<DD>Deserialize the fields of this object from <code>in</code>. 
343 
344 <p>For efficiency, implementations should attempt to re-use storage in the
345 existing object where possible.</p>
346<P>
347<DD><DL>
348<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>
349</DD>
350<DD><DL>
351<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
352<DT><B>Throws:</B>
353<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>
354</DD>
355</DL>
356<HR>
357
358<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
359write</H3>
360<PRE>
361public 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)
362           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>
363<DL>
364<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">Writable</A></CODE></B></DD>
365<DD>Serialize the fields of this object to <code>out</code>.
366<P>
367<DD><DL>
368<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>
369</DD>
370<DD><DL>
371<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
372<DT><B>Throws:</B>
373<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>
374</DD>
375</DL>
376<HR>
377
378<A NAME="getTypes()"><!-- --></A><H3>
379getTypes</H3>
380<PRE>
381protected abstract <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;[] <B>getTypes</B>()</PRE>
382<DL>
383<DD>Return all classes that may be wrapped.  Subclasses should implement this
384 to return a constant array of classes.
385<P>
386<DD><DL>
387</DL>
388</DD>
389<DD><DL>
390</DL>
391</DD>
392</DL>
393<HR>
394
395<A NAME="getConf()"><!-- --></A><H3>
396getConf</H3>
397<PRE>
398public <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <B>getConf</B>()</PRE>
399<DL>
400<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">Configurable</A></CODE></B></DD>
401<DD>Return the configuration used by this object.
402<P>
403<DD><DL>
404<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">getConf</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
405</DD>
406<DD><DL>
407</DL>
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409</DL>
410<HR>
411
412<A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
413setConf</H3>
414<PRE>
415public void <B>setConf</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
416<DL>
417<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">Configurable</A></CODE></B></DD>
418<DD>Set the configuration to be used by this object.
419<P>
420<DD><DL>
421<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</A></CODE></DL>
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