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7TupleWritable (Hadoop 0.20.1 API)
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90<FONT SIZE="-1">
91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Class TupleWritable</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.mapred.join.TupleWritable</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/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;, <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>TupleWritable</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="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</DL>
104</PRE>
105
106<P>
107Writable type storing multiple <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><CODE>Writable</CODE></A>s.
108
109 This is *not* a general-purpose tuple type. In almost all cases, users are
110 encouraged to implement their own serializable types, which can perform
111 better validation and provide more efficient encodings than this class is
112 capable. TupleWritable relies on the join framework for type safety and
113 assumes its instances will rarely be persisted, assumptions not only
114 incompatible with, but contrary to the general case.
115<P>
116
117<P>
118<DL>
119<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io"><CODE>Writable</CODE></A></DL>
120<HR>
121
122<P>
123
124<!-- ======== CONSTRUCTOR SUMMARY ======== -->
125
126<A NAME="constructor_summary"><!-- --></A>
127<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
128<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
129<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
130<B>Constructor Summary</B></FONT></TH>
131</TR>
132<TR BGCOLOR="white" CLASS="TableRowColor">
133<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#TupleWritable()">TupleWritable</A></B>()</CODE>
134
135<BR>
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an empty tuple with no allocated storage for writables.</TD>
137</TR>
138<TR BGCOLOR="white" CLASS="TableRowColor">
139<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#TupleWritable(org.apache.hadoop.io.Writable[])">TupleWritable</A></B>(<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>[]&nbsp;vals)</CODE>
140
141<BR>
142&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initialize tuple with storage; unknown whether any of them contain
143 &quot;written&quot; values.</TD>
144</TR>
145</TABLE>
146&nbsp;
147<!-- ========== METHOD SUMMARY =========== -->
148
149<A NAME="method_summary"><!-- --></A>
150<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
151<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
152<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
153<B>Method Summary</B></FONT></TH>
154</TR>
155<TR BGCOLOR="white" CLASS="TableRowColor">
156<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
157<CODE>&nbsp;boolean</CODE></FONT></TD>
158<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.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;other)</CODE>
159
160<BR>
161&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
162</TR>
163<TR BGCOLOR="white" CLASS="TableRowColor">
164<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
165<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></FONT></TD>
166<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#get(int)">get</A></B>(int&nbsp;i)</CODE>
167
168<BR>
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get ith Writable from Tuple.</TD>
170</TR>
171<TR BGCOLOR="white" CLASS="TableRowColor">
172<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
173<CODE>&nbsp;boolean</CODE></FONT></TD>
174<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#has(int)">has</A></B>(int&nbsp;i)</CODE>
175
176<BR>
177&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return true if tuple has an element at the position provided.</TD>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
181<CODE>&nbsp;int</CODE></FONT></TD>
182<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#hashCode()">hashCode</A></B>()</CODE>
183
184<BR>
185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
186</TR>
187<TR BGCOLOR="white" CLASS="TableRowColor">
188<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
189<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</CODE></FONT></TD>
190<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#iterator()">iterator</A></B>()</CODE>
191
192<BR>
193&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return an iterator over the elements in this tuple.</TD>
194</TR>
195<TR BGCOLOR="white" CLASS="TableRowColor">
196<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
197<CODE>&nbsp;void</CODE></FONT></TD>
198<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.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>
199
200<BR>
201&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
202</TR>
203<TR BGCOLOR="white" CLASS="TableRowColor">
204<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
205<CODE>&nbsp;int</CODE></FONT></TD>
206<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#size()">size</A></B>()</CODE>
207
208<BR>
209&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The number of children in this Tuple.</TD>
210</TR>
211<TR BGCOLOR="white" CLASS="TableRowColor">
212<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
213<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>
214<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.html#toString()">toString</A></B>()</CODE>
215
216<BR>
217&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Convert Tuple to String as in the following.</TD>
218</TR>
219<TR BGCOLOR="white" CLASS="TableRowColor">
220<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
221<CODE>&nbsp;void</CODE></FONT></TD>
222<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/TupleWritable.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>
223
224<BR>
225&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Writes each Writable to <code>out</code>.</TD>
226</TR>
227</TABLE>
228&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
229<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
230<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
231<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>
232</TR>
233<TR BGCOLOR="white" CLASS="TableRowColor">
234<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>
235</TR>
236</TABLE>
237&nbsp;
238<P>
239
240<!-- ========= CONSTRUCTOR DETAIL ======== -->
241
242<A NAME="constructor_detail"><!-- --></A>
243<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
244<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
245<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
246<B>Constructor Detail</B></FONT></TH>
247</TR>
248</TABLE>
249
250<A NAME="TupleWritable()"><!-- --></A><H3>
251TupleWritable</H3>
252<PRE>
253public <B>TupleWritable</B>()</PRE>
254<DL>
255<DD>Create an empty tuple with no allocated storage for writables.
256<P>
257</DL>
258<HR>
259
260<A NAME="TupleWritable(org.apache.hadoop.io.Writable[])"><!-- --></A><H3>
261TupleWritable</H3>
262<PRE>
263public <B>TupleWritable</B>(<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>[]&nbsp;vals)</PRE>
264<DL>
265<DD>Initialize tuple with storage; unknown whether any of them contain
266 &quot;written&quot; values.
267<P>
268</DL>
269
270<!-- ============ METHOD DETAIL ========== -->
271
272<A NAME="method_detail"><!-- --></A>
273<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
274<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
275<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
276<B>Method Detail</B></FONT></TH>
277</TR>
278</TABLE>
279
280<A NAME="has(int)"><!-- --></A><H3>
281has</H3>
282<PRE>
283public boolean <B>has</B>(int&nbsp;i)</PRE>
284<DL>
285<DD>Return true if tuple has an element at the position provided.
286<P>
287<DD><DL>
288</DL>
289</DD>
290<DD><DL>
291</DL>
292</DD>
293</DL>
294<HR>
295
296<A NAME="get(int)"><!-- --></A><H3>
297get</H3>
298<PRE>
299public <A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A> <B>get</B>(int&nbsp;i)</PRE>
300<DL>
301<DD>Get ith Writable from Tuple.
302<P>
303<DD><DL>
304</DL>
305</DD>
306<DD><DL>
307</DL>
308</DD>
309</DL>
310<HR>
311
312<A NAME="size()"><!-- --></A><H3>
313size</H3>
314<PRE>
315public int <B>size</B>()</PRE>
316<DL>
317<DD>The number of children in this Tuple.
318<P>
319<DD><DL>
320</DL>
321</DD>
322<DD><DL>
323</DL>
324</DD>
325</DL>
326<HR>
327
328<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
329equals</H3>
330<PRE>
331public 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;other)</PRE>
332<DL>
333<DD>
334<P>
335<DD><DL>
336<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>
337</DD>
338<DD><DL>
339</DL>
340</DD>
341</DL>
342<HR>
343
344<A NAME="hashCode()"><!-- --></A><H3>
345hashCode</H3>
346<PRE>
347public int <B>hashCode</B>()</PRE>
348<DL>
349<DD><DL>
350<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>
351</DD>
352<DD><DL>
353</DL>
354</DD>
355</DL>
356<HR>
357
358<A NAME="iterator()"><!-- --></A><H3>
359iterator</H3>
360<PRE>
361public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt; <B>iterator</B>()</PRE>
362<DL>
363<DD>Return an iterator over the elements in this tuple.
364 Note that this doesn't flatten the tuple; one may receive tuples
365 from this iterator.
366<P>
367<DD><DL>
368<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true#iterator()" title="class or interface in java.lang">iterator</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</A>&lt;<A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&gt;</CODE></DL>
369</DD>
370<DD><DL>
371</DL>
372</DD>
373</DL>
374<HR>
375
376<A NAME="toString()"><!-- --></A><H3>
377toString</H3>
378<PRE>
379public <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>
380<DL>
381<DD>Convert Tuple to String as in the following.
382 <tt>[<child1>,<child2>,...,<childn>]</tt>
383<P>
384<DD><DL>
385<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>
386</DD>
387<DD><DL>
388</DL>
389</DD>
390</DL>
391<HR>
392
393<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
394write</H3>
395<PRE>
396public 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)
397           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>
398<DL>
399<DD>Writes each Writable to <code>out</code>.
400 TupleWritable format:
401 <code>&lt;count&gt;&lt;type1&gt;&lt;type2&gt;...&lt;typen&gt;&lt;obj1&gt;&lt;obj2&gt;...&lt;objn&gt;
402 </code>
403<P>
404<DD><DL>
405<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>
406</DD>
407<DD><DL>
408<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
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="readFields(java.io.DataInput)"><!-- --></A><H3>
416readFields</H3>
417<PRE>
418public 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)
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>Deserialize the fields of this object from <code>in</code>. 
422 
423 <p>For efficiency, implementations should attempt to re-use storage in the
424 existing object where possible.</p>
425<P>
426<DD><DL>
427<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>
428</DD>
429<DD><DL>
430<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
431<DT><B>Throws:</B>
432<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>
433</DD>
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