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91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Interface ComposableRecordReader&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,V extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</H2>
94<DL>
95<DT><B>All Superinterfaces:</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/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;K,?&gt;&gt;, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A>&lt;K,V&gt;</DD>
96</DL>
97<DL>
98<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/join/InnerJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">InnerJoinRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/OuterJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">OuterJoinRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="class in org.apache.hadoop.mapred.join">OverrideRecordReader</A>, <A HREF="../../../../../org/apache/hadoop/mapred/join/WrappedRecordReader.html" title="class in org.apache.hadoop.mapred.join">WrappedRecordReader</A></DD>
99</DL>
100<HR>
101<DL>
102<DT><PRE>public interface <B>ComposableRecordReader&lt;K extends <A HREF="../../../../../org/apache/hadoop/io/WritableComparable.html" title="interface in org.apache.hadoop.io">WritableComparable</A>,V extends <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</B><DT>extends <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A>&lt;K,V&gt;, <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/mapred/join/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</A>&lt;K,?&gt;&gt;</DL>
103</PRE>
104
105<P>
106Additional operations required of a RecordReader to participate in a join.
107<P>
108
109<P>
110<HR>
111
112<P>
113
114<!-- ========== METHOD SUMMARY =========== -->
115
116<A NAME="method_summary"><!-- --></A>
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120<B>Method Summary</B></FONT></TH>
121</TR>
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123<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
124<CODE>&nbsp;void</CODE></FONT></TD>
125<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)">accept</A></B>(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector&nbsp;jc,
126       <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)</CODE>
127
128<BR>
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;While key-value pairs from this RecordReader match the given key, register
130 them with the JoinCollector provided.</TD>
131</TR>
132<TR BGCOLOR="white" CLASS="TableRowColor">
133<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
134<CODE>&nbsp;boolean</CODE></FONT></TD>
135<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#hasNext()">hasNext</A></B>()</CODE>
136
137<BR>
138&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns true if the stream is not empty, but provides no guarantee that
139 a call to next(K,V) will succeed.</TD>
140</TR>
141<TR BGCOLOR="white" CLASS="TableRowColor">
142<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
143<CODE>&nbsp;int</CODE></FONT></TD>
144<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#id()">id</A></B>()</CODE>
145
146<BR>
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the position in the collector this class occupies.</TD>
148</TR>
149<TR BGCOLOR="white" CLASS="TableRowColor">
150<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
151<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A></CODE></FONT></TD>
152<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#key()">key</A></B>()</CODE>
153
154<BR>
155&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the key this RecordReader would supply on a call to next(K,V)</TD>
156</TR>
157<TR BGCOLOR="white" CLASS="TableRowColor">
158<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
159<CODE>&nbsp;void</CODE></FONT></TD>
160<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#key(K)">key</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Clone the key at the head of this RecordReader into the object provided.</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;void</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html#skip(K)">skip</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Skip key-value pairs with keys less than or equal to the key provided.</TD>
172</TR>
173</TABLE>
174&nbsp;<A NAME="methods_inherited_from_class_org.apache.hadoop.mapred.RecordReader"><!-- --></A>
175<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
176<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
177<TH ALIGN="left"><B>Methods inherited from interface org.apache.hadoop.mapred.<A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A></B></TH>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<TD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#close()">close</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">createKey</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#createValue()">createValue</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">getPos</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">getProgress</A>, <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html#next(K, V)">next</A></CODE></TD>
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193<P>
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204
205<A NAME="id()"><!-- --></A><H3>
206id</H3>
207<PRE>
208int <B>id</B>()</PRE>
209<DL>
210<DD>Return the position in the collector this class occupies.
211<P>
212<DD><DL>
213</DL>
214</DD>
215<DD><DL>
216</DL>
217</DD>
218</DL>
219<HR>
220
221<A NAME="key()"><!-- --></A><H3>
222key</H3>
223<PRE>
224<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A> <B>key</B>()</PRE>
225<DL>
226<DD>Return the key this RecordReader would supply on a call to next(K,V)
227<P>
228<DD><DL>
229</DL>
230</DD>
231<DD><DL>
232</DL>
233</DD>
234</DL>
235<HR>
236
237<A NAME="key(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="key(K)"><!-- --></A><H3>
238key</H3>
239<PRE>
240void <B>key</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)
241         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>
242<DL>
243<DD>Clone the key at the head of this RecordReader into the object provided.
244<P>
245<DD><DL>
246</DL>
247</DD>
248<DD><DL>
249
250<DT><B>Throws:</B>
251<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>
252</DD>
253</DL>
254<HR>
255
256<A NAME="hasNext()"><!-- --></A><H3>
257hasNext</H3>
258<PRE>
259boolean <B>hasNext</B>()</PRE>
260<DL>
261<DD>Returns true if the stream is not empty, but provides no guarantee that
262 a call to next(K,V) will succeed.
263<P>
264<DD><DL>
265</DL>
266</DD>
267<DD><DL>
268</DL>
269</DD>
270</DL>
271<HR>
272
273<A NAME="skip(org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="skip(K)"><!-- --></A><H3>
274skip</H3>
275<PRE>
276void <B>skip</B>(<A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)
277          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>
278<DL>
279<DD>Skip key-value pairs with keys less than or equal to the key provided.
280<P>
281<DD><DL>
282</DL>
283</DD>
284<DD><DL>
285
286<DT><B>Throws:</B>
287<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>
288</DD>
289</DL>
290<HR>
291
292<A NAME="accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector,org.apache.hadoop.io.WritableComparable)"><!-- --></A><A NAME="accept(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector, K)"><!-- --></A><H3>
293accept</H3>
294<PRE>
295void <B>accept</B>(org.apache.hadoop.mapred.join.CompositeRecordReader.JoinCollector&nbsp;jc,
296            <A HREF="../../../../../org/apache/hadoop/mapred/join/ComposableRecordReader.html" title="type parameter in ComposableRecordReader">K</A>&nbsp;key)
297            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>
298<DL>
299<DD>While key-value pairs from this RecordReader match the given key, register
300 them with the JoinCollector provided.
301<P>
302<DD><DL>
303</DL>
304</DD>
305<DD><DL>
306
307<DT><B>Throws:</B>
308<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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