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7MapFile.Reader (Hadoop 0.20.1 API)
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58&nbsp;<A HREF="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io"><B>PREV CLASS</B></A>&nbsp;
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79  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;FIELD&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
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91org.apache.hadoop.io</FONT>
92<BR>
93Class MapFile.Reader</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.MapFile.Reader</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/io/ArrayFile.Reader.html" title="class in org.apache.hadoop.io">ArrayFile.Reader</A>, <A HREF="../../../../org/apache/hadoop/io/BloomMapFile.Reader.html" title="class in org.apache.hadoop.io">BloomMapFile.Reader</A>, <A HREF="../../../../org/apache/hadoop/io/SetFile.Reader.html" title="class in org.apache.hadoop.io">SetFile.Reader</A></DD>
103</DL>
104<DL>
105<DT><B>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/io/MapFile.html" title="class in org.apache.hadoop.io">MapFile</A></DD>
106</DL>
107<HR>
108<DL>
109<DT><PRE>public static class <B>MapFile.Reader</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="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></DL>
110</PRE>
111
112<P>
113Provide access to an existing map.
114<P>
115
116<P>
117<HR>
118
119<P>
120
121<!-- ======== CONSTRUCTOR SUMMARY ======== -->
122
123<A NAME="constructor_summary"><!-- --></A>
124<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
125<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
126<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
127<B>Constructor Summary</B></FONT></TH>
128</TR>
129<TR BGCOLOR="white" CLASS="TableRowColor">
130<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
131<CODE>&nbsp;</CODE></FONT></TD>
132<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.conf.Configuration)">MapFile.Reader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
133               <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;dirName,
134               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a map reader for the named map.</TD>
138</TR>
139<TR BGCOLOR="white" CLASS="TableRowColor">
140<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
141<CODE>&nbsp;</CODE></FONT></TD>
142<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)">MapFile.Reader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
143               <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;dirName,
144               <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
145               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a map reader for the named map using the named comparator.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>protected </CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration, boolean)">MapFile.Reader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
154               <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;dirName,
155               <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
156               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
157               boolean&nbsp;open)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hook to allow subclasses to defer opening streams until further
161 initialization is complete.</TD>
162</TR>
163</TABLE>
164&nbsp;
165<!-- ========== METHOD SUMMARY =========== -->
166
167<A NAME="method_summary"><!-- --></A>
168<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
169<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
170<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
171<B>Method Summary</B></FONT></TH>
172</TR>
173<TR BGCOLOR="white" CLASS="TableRowColor">
174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>&nbsp;void</CODE></FONT></TD>
176<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#close()">close</A></B>()</CODE>
177
178<BR>
179&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close the map.</TD>
180</TR>
181<TR BGCOLOR="white" CLASS="TableRowColor">
182<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
183<CODE>protected &nbsp;<A HREF="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io">SequenceFile.Reader</A></CODE></FONT></TD>
184<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#createDataFileReader(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.fs.Path, org.apache.hadoop.conf.Configuration)">createDataFileReader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
185                     <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;dataFile,
186                     <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Override this method to specialize the type of
190 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile.Reader</CODE></A> returned.</TD>
191</TR>
192<TR BGCOLOR="white" CLASS="TableRowColor">
193<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
194<CODE>&nbsp;void</CODE></FONT></TD>
195<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#finalKey(org.apache.hadoop.io.WritableComparable)">finalKey</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)</CODE>
196
197<BR>
198&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads the final key from the file.</TD>
199</TR>
200<TR BGCOLOR="white" CLASS="TableRowColor">
201<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
202<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></FONT></TD>
203<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#get(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">get</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
204    <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)</CODE>
205
206<BR>
207&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the value for the named key, or null if none exists.</TD>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
211<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD>
212<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">getClosest</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
213           <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)</CODE>
214
215<BR>
216&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finds the record that is the closest match to the specified key.</TD>
217</TR>
218<TR BGCOLOR="white" CLASS="TableRowColor">
219<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
220<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD>
221<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable, boolean)">getClosest</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
222           <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val,
223           boolean&nbsp;before)</CODE>
224
225<BR>
226&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Finds the record that is the closest match to the specified key.</TD>
227</TR>
228<TR BGCOLOR="white" CLASS="TableRowColor">
229<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
230<CODE>&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;?&gt;</CODE></FONT></TD>
231<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getKeyClass()">getKeyClass</A></B>()</CODE>
232
233<BR>
234&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the class of keys in this file.</TD>
235</TR>
236<TR BGCOLOR="white" CLASS="TableRowColor">
237<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
238<CODE>&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;?&gt;</CODE></FONT></TD>
239<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getValueClass()">getValueClass</A></B>()</CODE>
240
241<BR>
242&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the class of values in this file.</TD>
243</TR>
244<TR BGCOLOR="white" CLASS="TableRowColor">
245<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
246<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD>
247<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#midKey()">midKey</A></B>()</CODE>
248
249<BR>
250&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the key at approximately the middle of the file.</TD>
251</TR>
252<TR BGCOLOR="white" CLASS="TableRowColor">
253<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
254<CODE>&nbsp;boolean</CODE></FONT></TD>
255<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#next(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">next</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
256     <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)</CODE>
257
258<BR>
259&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the next key/value pair in the map into <code>key</code> and
260 <code>val</code>.</TD>
261</TR>
262<TR BGCOLOR="white" CLASS="TableRowColor">
263<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
264<CODE>protected &nbsp;void</CODE></FONT></TD>
265<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#open(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)">open</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
266     <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;dirName,
267     <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
268     <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
269
270<BR>
271&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
272</TR>
273<TR BGCOLOR="white" CLASS="TableRowColor">
274<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
275<CODE>&nbsp;void</CODE></FONT></TD>
276<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#reset()">reset</A></B>()</CODE>
277
278<BR>
279&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Re-positions the reader before its first key.</TD>
280</TR>
281<TR BGCOLOR="white" CLASS="TableRowColor">
282<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
283<CODE>&nbsp;boolean</CODE></FONT></TD>
284<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#seek(org.apache.hadoop.io.WritableComparable)">seek</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)</CODE>
285
286<BR>
287&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Positions the reader at the named key, or if none such exists, at the
288 first entry after the named key.</TD>
289</TR>
290</TABLE>
291&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
292<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
293<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
294<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>
295</TR>
296<TR BGCOLOR="white" CLASS="TableRowColor">
297<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>
298</TR>
299</TABLE>
300&nbsp;
301<P>
302
303<!-- ========= CONSTRUCTOR DETAIL ======== -->
304
305<A NAME="constructor_detail"><!-- --></A>
306<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
307<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
308<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
309<B>Constructor Detail</B></FONT></TH>
310</TR>
311</TABLE>
312
313<A NAME="MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
314MapFile.Reader</H3>
315<PRE>
316public <B>MapFile.Reader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
317                      <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;dirName,
318                      <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
319               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>
320<DL>
321<DD>Construct a map reader for the named map.
322<P>
323<DL>
324
325<DT><B>Throws:</B>
326<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>
327</DL>
328<HR>
329
330<A NAME="MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
331MapFile.Reader</H3>
332<PRE>
333public <B>MapFile.Reader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
334                      <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;dirName,
335                      <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
336                      <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
337               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>
338<DL>
339<DD>Construct a map reader for the named map using the named comparator.
340<P>
341<DL>
342
343<DT><B>Throws:</B>
344<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>
345</DL>
346<HR>
347
348<A NAME="MapFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration, boolean)"><!-- --></A><H3>
349MapFile.Reader</H3>
350<PRE>
351protected <B>MapFile.Reader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
352                         <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;dirName,
353                         <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
354                         <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
355                         boolean&nbsp;open)
356                  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>
357<DL>
358<DD>Hook to allow subclasses to defer opening streams until further
359 initialization is complete.
360<P>
361<DL>
362
363<DT><B>Throws:</B>
364<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><DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#createDataFileReader(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.fs.Path, org.apache.hadoop.conf.Configuration)"><CODE>createDataFileReader(FileSystem, Path, Configuration)</CODE></A></DL>
365</DL>
366
367<!-- ============ METHOD DETAIL ========== -->
368
369<A NAME="method_detail"><!-- --></A>
370<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
371<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
372<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
373<B>Method Detail</B></FONT></TH>
374</TR>
375</TABLE>
376
377<A NAME="getKeyClass()"><!-- --></A><H3>
378getKeyClass</H3>
379<PRE>
380public <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;?&gt; <B>getKeyClass</B>()</PRE>
381<DL>
382<DD>Returns the class of keys in this file.
383<P>
384<DD><DL>
385</DL>
386</DD>
387<DD><DL>
388</DL>
389</DD>
390</DL>
391<HR>
392
393<A NAME="getValueClass()"><!-- --></A><H3>
394getValueClass</H3>
395<PRE>
396public <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;?&gt; <B>getValueClass</B>()</PRE>
397<DL>
398<DD>Returns the class of values in this file.
399<P>
400<DD><DL>
401</DL>
402</DD>
403<DD><DL>
404</DL>
405</DD>
406</DL>
407<HR>
408
409<A NAME="open(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
410open</H3>
411<PRE>
412protected void <B>open</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
413                    <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;dirName,
414                    <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
415                    <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
416             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>
417<DL>
418<DD><DL>
419</DL>
420</DD>
421<DD><DL>
422
423<DT><B>Throws:</B>
424<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>
425</DD>
426</DL>
427<HR>
428
429<A NAME="createDataFileReader(org.apache.hadoop.fs.FileSystem, org.apache.hadoop.fs.Path, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
430createDataFileReader</H3>
431<PRE>
432protected <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io">SequenceFile.Reader</A> <B>createDataFileReader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
433                                                   <A HREF="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;dataFile,
434                                                   <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
435                                            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>
436<DL>
437<DD>Override this method to specialize the type of
438 <A HREF="../../../../org/apache/hadoop/io/SequenceFile.Reader.html" title="class in org.apache.hadoop.io"><CODE>SequenceFile.Reader</CODE></A> returned.
439<P>
440<DD><DL>
441</DL>
442</DD>
443<DD><DL>
444
445<DT><B>Throws:</B>
446<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>
447</DD>
448</DL>
449<HR>
450
451<A NAME="reset()"><!-- --></A><H3>
452reset</H3>
453<PRE>
454public void <B>reset</B>()
455           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>
456<DL>
457<DD>Re-positions the reader before its first key.
458<P>
459<DD><DL>
460</DL>
461</DD>
462<DD><DL>
463
464<DT><B>Throws:</B>
465<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>
466</DD>
467</DL>
468<HR>
469
470<A NAME="midKey()"><!-- --></A><H3>
471midKey</H3>
472<PRE>
473public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>midKey</B>()
474                          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>
475<DL>
476<DD>Get the key at approximately the middle of the file.
477<P>
478<DD><DL>
479</DL>
480</DD>
481<DD><DL>
482
483<DT><B>Throws:</B>
484<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>
485</DD>
486</DL>
487<HR>
488
489<A NAME="finalKey(org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3>
490finalKey</H3>
491<PRE>
492public void <B>finalKey</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)
493              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>
494<DL>
495<DD>Reads the final key from the file.
496<P>
497<DD><DL>
498</DL>
499</DD>
500<DD><DL>
501<DT><B>Parameters:</B><DD><CODE>key</CODE> - key to read into
502<DT><B>Throws:</B>
503<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>
504</DD>
505</DL>
506<HR>
507
508<A NAME="seek(org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3>
509seek</H3>
510<PRE>
511public boolean <B>seek</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)
512             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>
513<DL>
514<DD>Positions the reader at the named key, or if none such exists, at the
515 first entry after the named key.  Returns true iff the named key exists
516 in this map.
517<P>
518<DD><DL>
519</DL>
520</DD>
521<DD><DL>
522
523<DT><B>Throws:</B>
524<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>
525</DD>
526</DL>
527<HR>
528
529<A NAME="next(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)"><!-- --></A><H3>
530next</H3>
531<PRE>
532public boolean <B>next</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
533                    <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)
534             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>
535<DL>
536<DD>Read the next key/value pair in the map into <code>key</code> and
537 <code>val</code>.  Returns true if such a pair exists and false when at
538 the end of the map
539<P>
540<DD><DL>
541</DL>
542</DD>
543<DD><DL>
544
545<DT><B>Throws:</B>
546<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>
547</DD>
548</DL>
549<HR>
550
551<A NAME="get(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)"><!-- --></A><H3>
552get</H3>
553<PRE>
554public <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> <B>get</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
555                    <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)
556             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>
557<DL>
558<DD>Return the value for the named key, or null if none exists.
559<P>
560<DD><DL>
561</DL>
562</DD>
563<DD><DL>
564
565<DT><B>Throws:</B>
566<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>
567</DD>
568</DL>
569<HR>
570
571<A NAME="getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)"><!-- --></A><H3>
572getClosest</H3>
573<PRE>
574public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>getClosest</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
575                                     <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val)
576                              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>
577<DL>
578<DD>Finds the record that is the closest match to the specified key.
579 Returns <code>key</code> or if it does not exist, at the first entry
580 after the named key.
581 
582-     * @param key       - key that we're trying to find
583-     * @param val       - data value if key is found
584-     * @return          - the key that was the closest match or null if eof.
585<P>
586<DD><DL>
587</DL>
588</DD>
589<DD><DL>
590
591<DT><B>Throws:</B>
592<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>
593</DD>
594</DL>
595<HR>
596
597<A NAME="getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable, boolean)"><!-- --></A><H3>
598getClosest</H3>
599<PRE>
600public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>getClosest</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key,
601                                     <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;val,
602                                     boolean&nbsp;before)
603                              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>
604<DL>
605<DD>Finds the record that is the closest match to the specified key.
606<P>
607<DD><DL>
608</DL>
609</DD>
610<DD><DL>
611<DT><B>Parameters:</B><DD><CODE>key</CODE> - - key that we're trying to find<DD><CODE>val</CODE> - - data value if key is found<DD><CODE>before</CODE> - - IF true, and <code>key</code> does not exist, return
612 the first entry that falls just before the <code>key</code>.  Otherwise,
613 return the record that sorts just after.
614<DT><B>Returns:</B><DD>- the key that was the closest match or null if eof.
615<DT><B>Throws:</B>
616<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>
617</DD>
618</DL>
619<HR>
620
621<A NAME="close()"><!-- --></A><H3>
622close</H3>
623<PRE>
624public void <B>close</B>()
625           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>
626<DL>
627<DD>Close the map.
628<P>
629<DD><DL>
630<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</A></CODE></DL>
631</DD>
632<DD><DL>
633
634<DT><B>Throws:</B>
635<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>
636</DD>
637</DL>
638<!-- ========= END OF CLASS DATA ========= -->
639<HR>
640
641
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643<A NAME="navbar_bottom"><!-- --></A>
644<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A>
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