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7SetFile.Reader (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class SetFile.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 "><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">org.apache.hadoop.io.MapFile.Reader</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.SetFile.Reader</B>
98</PRE>
99<DL>
100<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>
101</DL>
102<DL>
103<DT><B>Enclosing class:</B><DD><A HREF="../../../../org/apache/hadoop/io/SetFile.html" title="class in org.apache.hadoop.io">SetFile</A></DD>
104</DL>
105<HR>
106<DL>
107<DT><PRE>public static class <B>SetFile.Reader</B><DT>extends <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">MapFile.Reader</A></DL>
108</PRE>
109
110<P>
111Provide access to an existing set file.
112<P>
113
114<P>
115<HR>
116
117<P>
118
119<!-- ======== CONSTRUCTOR SUMMARY ======== -->
120
121<A NAME="constructor_summary"><!-- --></A>
122<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
123<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
124<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
125<B>Constructor Summary</B></FONT></TH>
126</TR>
127<TR BGCOLOR="white" CLASS="TableRowColor">
128<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SetFile.Reader.html#SetFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.conf.Configuration)">SetFile.Reader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
129               <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,
130               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
131
132<BR>
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a set reader for the named set.</TD>
134</TR>
135<TR BGCOLOR="white" CLASS="TableRowColor">
136<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SetFile.Reader.html#SetFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)">SetFile.Reader</A></B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
137               <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,
138               <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
139               <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
140
141<BR>
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct a set reader for the named set using the named comparator.</TD>
143</TR>
144</TABLE>
145&nbsp;
146<!-- ========== METHOD SUMMARY =========== -->
147
148<A NAME="method_summary"><!-- --></A>
149<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
150<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
151<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
152<B>Method Summary</B></FONT></TH>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A></CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SetFile.Reader.html#get(org.apache.hadoop.io.WritableComparable)">get</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the matching key from a set into <code>key</code>.</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>&nbsp;boolean</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SetFile.Reader.html#next(org.apache.hadoop.io.WritableComparable)">next</A></B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the next key in a set into <code>key</code>.</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>&nbsp;boolean</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/SetFile.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>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Positions the reader at the named key, or if none such exists, at the
177 first entry after the named key.</TD>
178</TR>
179</TABLE>
180&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.io.MapFile.Reader"><!-- --></A>
181<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
182<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
183<TH ALIGN="left"><B>Methods inherited from class org.apache.hadoop.io.<A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">MapFile.Reader</A></B></TH>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD><CODE><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#close()">close</A>, <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>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#finalKey(org.apache.hadoop.io.WritableComparable)">finalKey</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#get(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">get</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">getClosest</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getClosest(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable, boolean)">getClosest</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getKeyClass()">getKeyClass</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#getValueClass()">getValueClass</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#midKey()">midKey</A>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#next(org.apache.hadoop.io.WritableComparable, org.apache.hadoop.io.Writable)">next</A>, <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>, <A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#reset()">reset</A></CODE></TD>
187</TR>
188</TABLE>
189&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
190<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
191<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
192<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>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<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>
196</TR>
197</TABLE>
198&nbsp;
199<P>
200
201<!-- ========= CONSTRUCTOR DETAIL ======== -->
202
203<A NAME="constructor_detail"><!-- --></A>
204<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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206<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
207<B>Constructor Detail</B></FONT></TH>
208</TR>
209</TABLE>
210
211<A NAME="SetFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
212SetFile.Reader</H3>
213<PRE>
214public <B>SetFile.Reader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
215                      <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,
216                      <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
217               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>
218<DL>
219<DD>Construct a set reader for the named set.
220<P>
221<DL>
222
223<DT><B>Throws:</B>
224<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>
225</DL>
226<HR>
227
228<A NAME="SetFile.Reader(org.apache.hadoop.fs.FileSystem, java.lang.String, org.apache.hadoop.io.WritableComparator, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
229SetFile.Reader</H3>
230<PRE>
231public <B>SetFile.Reader</B>(<A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</A>&nbsp;fs,
232                      <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,
233                      <A HREF="../../../../org/apache/hadoop/io/WritableComparator.html" title="class in org.apache.hadoop.io">WritableComparator</A>&nbsp;comparator,
234                      <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
235               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>
236<DL>
237<DD>Construct a set reader for the named set using the named comparator.
238<P>
239<DL>
240
241<DT><B>Throws:</B>
242<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>
243</DL>
244
245<!-- ============ METHOD DETAIL ========== -->
246
247<A NAME="method_detail"><!-- --></A>
248<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
249<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
250<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
251<B>Method Detail</B></FONT></TH>
252</TR>
253</TABLE>
254
255<A NAME="seek(org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3>
256seek</H3>
257<PRE>
258public boolean <B>seek</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)
259             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>
260<DL>
261<DD><B>Description copied from class: <CODE><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#seek(org.apache.hadoop.io.WritableComparable)">MapFile.Reader</A></CODE></B></DD>
262<DD>Positions the reader at the named key, or if none such exists, at the
263 first entry after the named key.  Returns true iff the named key exists
264 in this map.
265<P>
266<DD><DL>
267<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html#seek(org.apache.hadoop.io.WritableComparable)">seek</A></CODE> in class <CODE><A HREF="../../../../org/apache/hadoop/io/MapFile.Reader.html" title="class in org.apache.hadoop.io">MapFile.Reader</A></CODE></DL>
268</DD>
269<DD><DL>
270
271<DT><B>Throws:</B>
272<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>
273</DD>
274</DL>
275<HR>
276
277<A NAME="next(org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3>
278next</H3>
279<PRE>
280public boolean <B>next</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)
281             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>
282<DL>
283<DD>Read the next key in a set into <code>key</code>.  Returns
284 true if such a key exists and false when at the end of the set.
285<P>
286<DD><DL>
287
288<DT><B>Throws:</B>
289<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>
290</DD>
291</DL>
292<HR>
293
294<A NAME="get(org.apache.hadoop.io.WritableComparable)"><!-- --></A><H3>
295get</H3>
296<PRE>
297public <A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A> <B>get</B>(<A HREF="../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>&nbsp;key)
298                       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>
299<DL>
300<DD>Read the matching key from a set into <code>key</code>.
301 Returns <code>key</code>, or null if no match exists.
302<P>
303<DD><DL>
304
305<DT><B>Throws:</B>
306<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>
307</DD>
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