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7AbstractMapWritable (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class AbstractMapWritable</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.AbstractMapWritable</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<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/io/MapWritable.html" title="class in org.apache.hadoop.io">MapWritable</A>, <A HREF="../../../../org/apache/hadoop/io/SortedMapWritable.html" title="class in org.apache.hadoop.io">SortedMapWritable</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public abstract class <B>AbstractMapWritable</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>
107</PRE>
108
109<P>
110Abstract base class for MapWritable and SortedMapWritable
111 
112 Unlike org.apache.nutch.crawl.MapWritable, this class allows creation of
113 MapWritable&lt;Writable, MapWritable&gt; so the CLASS_TO_ID and ID_TO_CLASS
114 maps travel with the class instead of being static.
115 
116 Class ids range from 1 to 127 so there can be at most 127 distinct classes
117 in any specific map instance.
118<P>
119
120<P>
121<HR>
122
123<P>
124
125<!-- ======== CONSTRUCTOR SUMMARY ======== -->
126
127<A NAME="constructor_summary"><!-- --></A>
128<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
129<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
130<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
131<B>Constructor Summary</B></FONT></TH>
132</TR>
133<TR BGCOLOR="white" CLASS="TableRowColor">
134<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
135<CODE>protected </CODE></FONT></TD>
136<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#AbstractMapWritable()">AbstractMapWritable</A></B>()</CODE>
137
138<BR>
139&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;constructor.</TD>
140</TR>
141</TABLE>
142&nbsp;
143<!-- ========== METHOD SUMMARY =========== -->
144
145<A NAME="method_summary"><!-- --></A>
146<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
147<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
148<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
149<B>Method Summary</B></FONT></TH>
150</TR>
151<TR BGCOLOR="white" CLASS="TableRowColor">
152<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
153<CODE>protected &nbsp;void</CODE></FONT></TD>
154<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#addToMap(java.lang.Class)">addToMap</A></B>(<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>&nbsp;clazz)</CODE>
155
156<BR>
157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Add a Class to the maps if it is not already present.</TD>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
161<CODE>protected &nbsp;void</CODE></FONT></TD>
162<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#copy(org.apache.hadoop.io.Writable)">copy</A></B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;other)</CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Used by child copy constructors.</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
169<CODE>protected &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></CODE></FONT></TD>
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#getClass(byte)">getClass</A></B>(byte&nbsp;id)</CODE>
171
172<BR>
173&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A></CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#getConf()">getConf</A></B>()</CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the configuration used by this object.</TD>
182</TR>
183<TR BGCOLOR="white" CLASS="TableRowColor">
184<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
185<CODE>protected &nbsp;byte</CODE></FONT></TD>
186<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.html#getId(java.lang.Class)">getId</A></B>(<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>&nbsp;clazz)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>&nbsp;void</CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.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>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
198</TR>
199<TR BGCOLOR="white" CLASS="TableRowColor">
200<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
201<CODE>&nbsp;void</CODE></FONT></TD>
202<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.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>
203
204<BR>
205&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the configuration to be used by this object.</TD>
206</TR>
207<TR BGCOLOR="white" CLASS="TableRowColor">
208<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
209<CODE>&nbsp;void</CODE></FONT></TD>
210<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/AbstractMapWritable.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>
211
212<BR>
213&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
214</TR>
215</TABLE>
216&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
217<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
218<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
219<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>
220</TR>
221<TR BGCOLOR="white" CLASS="TableRowColor">
222<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>
223</TR>
224</TABLE>
225&nbsp;
226<P>
227
228<!-- ========= CONSTRUCTOR DETAIL ======== -->
229
230<A NAME="constructor_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>Constructor Detail</B></FONT></TH>
235</TR>
236</TABLE>
237
238<A NAME="AbstractMapWritable()"><!-- --></A><H3>
239AbstractMapWritable</H3>
240<PRE>
241protected <B>AbstractMapWritable</B>()</PRE>
242<DL>
243<DD>constructor.
244<P>
245</DL>
246
247<!-- ============ METHOD DETAIL ========== -->
248
249<A NAME="method_detail"><!-- --></A>
250<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
251<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
252<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
253<B>Method Detail</B></FONT></TH>
254</TR>
255</TABLE>
256
257<A NAME="addToMap(java.lang.Class)"><!-- --></A><H3>
258addToMap</H3>
259<PRE>
260protected void <B>addToMap</B>(<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>&nbsp;clazz)</PRE>
261<DL>
262<DD>Add a Class to the maps if it is not already present.
263<P>
264<DD><DL>
265</DL>
266</DD>
267<DD><DL>
268</DL>
269</DD>
270</DL>
271<HR>
272
273<A NAME="getClass(byte)"><!-- --></A><H3>
274getClass</H3>
275<PRE>
276protected <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> <B>getClass</B>(byte&nbsp;id)</PRE>
277<DL>
278<DD><DL>
279</DL>
280</DD>
281<DD><DL>
282
283<DT><B>Returns:</B><DD>the Class class for the specified id</DL>
284</DD>
285</DL>
286<HR>
287
288<A NAME="getId(java.lang.Class)"><!-- --></A><H3>
289getId</H3>
290<PRE>
291protected byte <B>getId</B>(<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>&nbsp;clazz)</PRE>
292<DL>
293<DD><DL>
294</DL>
295</DD>
296<DD><DL>
297
298<DT><B>Returns:</B><DD>the id for the specified Class</DL>
299</DD>
300</DL>
301<HR>
302
303<A NAME="copy(org.apache.hadoop.io.Writable)"><!-- --></A><H3>
304copy</H3>
305<PRE>
306protected void <B>copy</B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;other)</PRE>
307<DL>
308<DD>Used by child copy constructors.
309<P>
310<DD><DL>
311</DL>
312</DD>
313<DD><DL>
314</DL>
315</DD>
316</DL>
317<HR>
318
319<A NAME="getConf()"><!-- --></A><H3>
320getConf</H3>
321<PRE>
322public <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A> <B>getConf</B>()</PRE>
323<DL>
324<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/conf/Configurable.html#getConf()">Configurable</A></CODE></B></DD>
325<DD>Return the configuration used by this object.
326<P>
327<DD><DL>
328<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>
329</DD>
330<DD><DL>
331
332<DT><B>Returns:</B><DD>the conf</DL>
333</DD>
334</DL>
335<HR>
336
337<A NAME="setConf(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
338setConf</H3>
339<PRE>
340public void <B>setConf</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
341<DL>
342<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>
343<DD>Set the configuration to be used by this object.
344<P>
345<DD><DL>
346<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>
347</DD>
348<DD><DL>
349<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the conf to set</DL>
350</DD>
351</DL>
352<HR>
353
354<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
355write</H3>
356<PRE>
357public 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)
358           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>
359<DL>
360<DD>Serialize the fields of this object to <code>out</code>.
361<P>
362<DD><DL>
363<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>
364</DD>
365<DD><DL>
366<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
367<DT><B>Throws:</B>
368<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>
369</DD>
370</DL>
371<HR>
372
373<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
374readFields</H3>
375<PRE>
376public 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)
377                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>
378<DL>
379<DD>Deserialize the fields of this object from <code>in</code>. 
380 
381 <p>For efficiency, implementations should attempt to re-use storage in the
382 existing object where possible.</p>
383<P>
384<DD><DL>
385<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>
386</DD>
387<DD><DL>
388<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
389<DT><B>Throws:</B>
390<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>
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