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6<TITLE>
7ID (Hadoop 0.20.1 API)
8</TITLE>
9
10<META NAME="date" CONTENT="2009-09-01">
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18        parent.document.title="ID (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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88<!-- ======== START OF CLASS DATA ======== -->
89<H2>
90<FONT SIZE="-1">
91org.apache.hadoop.mapreduce</FONT>
92<BR>
93Class ID</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.mapreduce.ID</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&gt;, <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&gt;</DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/ID.html" title="class in org.apache.hadoop.mapred">ID</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public abstract class <B>ID</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/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&gt;</DL>
107</PRE>
108
109<P>
110A general identifier, which internally stores the id
111 as an integer. This is the super class of <A HREF="../../../../org/apache/hadoop/mapreduce/JobID.html" title="class in org.apache.hadoop.mapreduce"><CODE>JobID</CODE></A>,
112 <A HREF="../../../../org/apache/hadoop/mapreduce/TaskID.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskID</CODE></A> and <A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptID.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskAttemptID</CODE></A>.
113<P>
114
115<P>
116<DL>
117<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapreduce/JobID.html" title="class in org.apache.hadoop.mapreduce"><CODE>JobID</CODE></A>,
118<A HREF="../../../../org/apache/hadoop/mapreduce/TaskID.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskID</CODE></A>,
119<A HREF="../../../../org/apache/hadoop/mapreduce/TaskAttemptID.html" title="class in org.apache.hadoop.mapreduce"><CODE>TaskAttemptID</CODE></A></DL>
120<HR>
121
122<P>
123<!-- =========== FIELD SUMMARY =========== -->
124
125<A NAME="field_summary"><!-- --></A>
126<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
127<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
128<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
129<B>Field Summary</B></FONT></TH>
130</TR>
131<TR BGCOLOR="white" CLASS="TableRowColor">
132<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
133<CODE>protected &nbsp;int</CODE></FONT></TD>
134<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#id">id</A></B></CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
138</TR>
139<TR BGCOLOR="white" CLASS="TableRowColor">
140<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
141<CODE>protected static&nbsp;char</CODE></FONT></TD>
142<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#SEPARATOR">SEPARATOR</A></B></CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
146</TR>
147</TABLE>
148&nbsp;
149<!-- ======== CONSTRUCTOR SUMMARY ======== -->
150
151<A NAME="constructor_summary"><!-- --></A>
152<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
153<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
154<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
155<B>Constructor Summary</B></FONT></TH>
156</TR>
157<TR BGCOLOR="white" CLASS="TableRowColor">
158<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
159<CODE>protected </CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#ID()">ID</A></B>()</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#ID(int)">ID</A></B>(int&nbsp;id)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;constructs an ID object from the given int</TD>
172</TR>
173</TABLE>
174&nbsp;
175<!-- ========== METHOD SUMMARY =========== -->
176
177<A NAME="method_summary"><!-- --></A>
178<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
179<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
180<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
181<B>Method Summary</B></FONT></TH>
182</TR>
183<TR BGCOLOR="white" CLASS="TableRowColor">
184<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
185<CODE>&nbsp;int</CODE></FONT></TD>
186<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#compareTo(org.apache.hadoop.mapreduce.ID)">compareTo</A></B>(<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&nbsp;that)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compare IDs by associated numbers</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>&nbsp;boolean</CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#equals(java.lang.Object)">equals</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;o)</CODE>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
198</TR>
199<TR BGCOLOR="white" CLASS="TableRowColor">
200<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
201<CODE>&nbsp;int</CODE></FONT></TD>
202<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#getId()">getId</A></B>()</CODE>
203
204<BR>
205&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;returns the int which represents the identifier</TD>
206</TR>
207<TR BGCOLOR="white" CLASS="TableRowColor">
208<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
209<CODE>&nbsp;int</CODE></FONT></TD>
210<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#hashCode()">hashCode</A></B>()</CODE>
211
212<BR>
213&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
214</TR>
215<TR BGCOLOR="white" CLASS="TableRowColor">
216<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
217<CODE>&nbsp;void</CODE></FONT></TD>
218<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.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>
219
220<BR>
221&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
222</TR>
223<TR BGCOLOR="white" CLASS="TableRowColor">
224<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
225<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>
226<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.html#toString()">toString</A></B>()</CODE>
227
228<BR>
229&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
230</TR>
231<TR BGCOLOR="white" CLASS="TableRowColor">
232<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
233<CODE>&nbsp;void</CODE></FONT></TD>
234<TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapreduce/ID.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>
235
236<BR>
237&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serialize the fields of this object to <code>out</code>.</TD>
238</TR>
239</TABLE>
240&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
241<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
242<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
243<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>
244</TR>
245<TR BGCOLOR="white" CLASS="TableRowColor">
246<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#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#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>
247</TR>
248</TABLE>
249&nbsp;
250<P>
251
252<!-- ============ FIELD DETAIL =========== -->
253
254<A NAME="field_detail"><!-- --></A>
255<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
256<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
257<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
258<B>Field Detail</B></FONT></TH>
259</TR>
260</TABLE>
261
262<A NAME="SEPARATOR"><!-- --></A><H3>
263SEPARATOR</H3>
264<PRE>
265protected static final char <B>SEPARATOR</B></PRE>
266<DL>
267<DL>
268<DT><B>See Also:</B><DD><A HREF="../../../../constant-values.html#org.apache.hadoop.mapreduce.ID.SEPARATOR">Constant Field Values</A></DL>
269</DL>
270<HR>
271
272<A NAME="id"><!-- --></A><H3>
273id</H3>
274<PRE>
275protected int <B>id</B></PRE>
276<DL>
277<DL>
278</DL>
279</DL>
280
281<!-- ========= CONSTRUCTOR DETAIL ======== -->
282
283<A NAME="constructor_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>Constructor Detail</B></FONT></TH>
288</TR>
289</TABLE>
290
291<A NAME="ID(int)"><!-- --></A><H3>
292ID</H3>
293<PRE>
294public <B>ID</B>(int&nbsp;id)</PRE>
295<DL>
296<DD>constructs an ID object from the given int
297<P>
298</DL>
299<HR>
300
301<A NAME="ID()"><!-- --></A><H3>
302ID</H3>
303<PRE>
304protected <B>ID</B>()</PRE>
305<DL>
306</DL>
307
308<!-- ============ METHOD DETAIL ========== -->
309
310<A NAME="method_detail"><!-- --></A>
311<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
312<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
313<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
314<B>Method Detail</B></FONT></TH>
315</TR>
316</TABLE>
317
318<A NAME="getId()"><!-- --></A><H3>
319getId</H3>
320<PRE>
321public int <B>getId</B>()</PRE>
322<DL>
323<DD>returns the int which represents the identifier
324<P>
325<DD><DL>
326</DL>
327</DD>
328<DD><DL>
329</DL>
330</DD>
331</DL>
332<HR>
333
334<A NAME="toString()"><!-- --></A><H3>
335toString</H3>
336<PRE>
337public <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>
338<DL>
339<DD><DL>
340<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>
341</DD>
342<DD><DL>
343</DL>
344</DD>
345</DL>
346<HR>
347
348<A NAME="hashCode()"><!-- --></A><H3>
349hashCode</H3>
350<PRE>
351public int <B>hashCode</B>()</PRE>
352<DL>
353<DD><DL>
354<DT><B>Overrides:</B><DD><CODE><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></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>
355</DD>
356<DD><DL>
357</DL>
358</DD>
359</DL>
360<HR>
361
362<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
363equals</H3>
364<PRE>
365public boolean <B>equals</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;o)</PRE>
366<DL>
367<DD><DL>
368<DT><B>Overrides:</B><DD><CODE><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></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>
369</DD>
370<DD><DL>
371</DL>
372</DD>
373</DL>
374<HR>
375
376<A NAME="compareTo(org.apache.hadoop.mapreduce.ID)"><!-- --></A><H3>
377compareTo</H3>
378<PRE>
379public int <B>compareTo</B>(<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&nbsp;that)</PRE>
380<DL>
381<DD>Compare IDs by associated numbers
382<P>
383<DD><DL>
384<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang">compareTo</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;<A HREF="../../../../org/apache/hadoop/mapreduce/ID.html" title="class in org.apache.hadoop.mapreduce">ID</A>&gt;</CODE></DL>
385</DD>
386<DD><DL>
387</DL>
388</DD>
389</DL>
390<HR>
391
392<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
393readFields</H3>
394<PRE>
395public 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)
396                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>
397<DL>
398<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">Writable</A></CODE></B></DD>
399<DD>Deserialize the fields of this object from <code>in</code>. 
400 
401 <p>For efficiency, implementations should attempt to re-use storage in the
402 existing object where possible.</p>
403<P>
404<DD><DL>
405<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>
406</DD>
407<DD><DL>
408<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
409<DT><B>Throws:</B>
410<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>
411</DD>
412</DL>
413<HR>
414
415<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
416write</H3>
417<PRE>
418public 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)
419           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>
420<DL>
421<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">Writable</A></CODE></B></DD>
422<DD>Serialize the fields of this object to <code>out</code>.
423<P>
424<DD><DL>
425<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>
426</DD>
427<DD><DL>
428<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
429<DT><B>Throws:</B>
430<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>
431</DD>
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