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7CompressionCodecFactory (Hadoop 0.20.1 API)
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90<FONT SIZE="-1">
91org.apache.hadoop.io.compress</FONT>
92<BR>
93Class CompressionCodecFactory</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.compress.CompressionCodecFactory</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>CompressionCodecFactory</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></DL>
101</PRE>
102
103<P>
104A factory that will find the correct codec for a given filename.
105<P>
106
107<P>
108<HR>
109
110<P>
111<!-- =========== FIELD SUMMARY =========== -->
112
113<A NAME="field_summary"><!-- --></A>
114<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
115<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
116<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
117<B>Field Summary</B></FONT></TH>
118</TR>
119<TR BGCOLOR="white" CLASS="TableRowColor">
120<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
121<CODE>static&nbsp;org.apache.commons.logging.Log</CODE></FONT></TD>
122<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#LOG">LOG</A></B></CODE>
123
124<BR>
125&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
126</TR>
127</TABLE>
128&nbsp;
129<!-- ======== CONSTRUCTOR SUMMARY ======== -->
130
131<A NAME="constructor_summary"><!-- --></A>
132<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
133<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
134<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
135<B>Constructor Summary</B></FONT></TH>
136</TR>
137<TR BGCOLOR="white" CLASS="TableRowColor">
138<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#CompressionCodecFactory(org.apache.hadoop.conf.Configuration)">CompressionCodecFactory</A></B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
139
140<BR>
141&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Find the codecs specified in the config value io.compression.codecs
142 and register them.</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/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A></CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#getCodec(org.apache.hadoop.fs.Path)">getCodec</A></B>(<A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;file)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Find the relevant compression codec for the given file based on its
161 filename suffix.</TD>
162</TR>
163<TR BGCOLOR="white" CLASS="TableRowColor">
164<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
165<CODE>static&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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;? extends <A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&gt;&gt;</CODE></FONT></TD>
166<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#getCodecClasses(org.apache.hadoop.conf.Configuration)">getCodecClasses</A></B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
167
168<BR>
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the list of codecs listed in the configuration</TD>
170</TR>
171<TR BGCOLOR="white" CLASS="TableRowColor">
172<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
173<CODE>static&nbsp;void</CODE></FONT></TD>
174<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#main(java.lang.String[])">main</A></B>(<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;args)</CODE>
175
176<BR>
177&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A little test program.</TD>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
181<CODE>static&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>
182<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#removeSuffix(java.lang.String, java.lang.String)">removeSuffix</A></B>(<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;filename,
183             <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;suffix)</CODE>
184
185<BR>
186&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes a suffix from a filename, if it has it.</TD>
187</TR>
188<TR BGCOLOR="white" CLASS="TableRowColor">
189<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
190<CODE>static&nbsp;void</CODE></FONT></TD>
191<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#setCodecClasses(org.apache.hadoop.conf.Configuration, java.util.List)">setCodecClasses</A></B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
192                <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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>&gt;&nbsp;classes)</CODE>
193
194<BR>
195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets a list of codec classes in the configuration.</TD>
196</TR>
197<TR BGCOLOR="white" CLASS="TableRowColor">
198<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
199<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>
200<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodecFactory.html#toString()">toString</A></B>()</CODE>
201
202<BR>
203&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Print the extension map out as a string.</TD>
204</TR>
205</TABLE>
206&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
207<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
208<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
209<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>
210</TR>
211<TR BGCOLOR="white" CLASS="TableRowColor">
212<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#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>
213</TR>
214</TABLE>
215&nbsp;
216<P>
217
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219
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223<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
224<B>Field Detail</B></FONT></TH>
225</TR>
226</TABLE>
227
228<A NAME="LOG"><!-- --></A><H3>
229LOG</H3>
230<PRE>
231public static final org.apache.commons.logging.Log <B>LOG</B></PRE>
232<DL>
233<DL>
234</DL>
235</DL>
236
237<!-- ========= CONSTRUCTOR DETAIL ======== -->
238
239<A NAME="constructor_detail"><!-- --></A>
240<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
241<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
242<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
243<B>Constructor Detail</B></FONT></TH>
244</TR>
245</TABLE>
246
247<A NAME="CompressionCodecFactory(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
248CompressionCodecFactory</H3>
249<PRE>
250public <B>CompressionCodecFactory</B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
251<DL>
252<DD>Find the codecs specified in the config value io.compression.codecs
253 and register them. Defaults to gzip and zip.
254<P>
255</DL>
256
257<!-- ============ METHOD DETAIL ========== -->
258
259<A NAME="method_detail"><!-- --></A>
260<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
261<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
262<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
263<B>Method Detail</B></FONT></TH>
264</TR>
265</TABLE>
266
267<A NAME="toString()"><!-- --></A><H3>
268toString</H3>
269<PRE>
270public <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>
271<DL>
272<DD>Print the extension map out as a string.
273<P>
274<DD><DL>
275<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>
276</DD>
277<DD><DL>
278</DL>
279</DD>
280</DL>
281<HR>
282
283<A NAME="getCodecClasses(org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
284getCodecClasses</H3>
285<PRE>
286public static <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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;? extends <A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A>&gt;&gt; <B>getCodecClasses</B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
287<DL>
288<DD>Get the list of codecs listed in the configuration
289<P>
290<DD><DL>
291<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration to look in
292<DT><B>Returns:</B><DD>a list of the Configuration classes or null if the attribute
293         was not set</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="setCodecClasses(org.apache.hadoop.conf.Configuration, java.util.List)"><!-- --></A><H3>
299setCodecClasses</H3>
300<PRE>
301public static void <B>setCodecClasses</B>(<A HREF="../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
302                                   <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<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>&gt;&nbsp;classes)</PRE>
303<DL>
304<DD>Sets a list of codec classes in the configuration.
305<P>
306<DD><DL>
307<DT><B>Parameters:</B><DD><CODE>conf</CODE> - the configuration to modify<DD><CODE>classes</CODE> - the list of classes to set</DL>
308</DD>
309</DL>
310<HR>
311
312<A NAME="getCodec(org.apache.hadoop.fs.Path)"><!-- --></A><H3>
313getCodec</H3>
314<PRE>
315public <A HREF="../../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</A> <B>getCodec</B>(<A HREF="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</A>&nbsp;file)</PRE>
316<DL>
317<DD>Find the relevant compression codec for the given file based on its
318 filename suffix.
319<P>
320<DD><DL>
321<DT><B>Parameters:</B><DD><CODE>file</CODE> - the filename to check
322<DT><B>Returns:</B><DD>the codec object</DL>
323</DD>
324</DL>
325<HR>
326
327<A NAME="removeSuffix(java.lang.String, java.lang.String)"><!-- --></A><H3>
328removeSuffix</H3>
329<PRE>
330public static <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>removeSuffix</B>(<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;filename,
331                                  <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;suffix)</PRE>
332<DL>
333<DD>Removes a suffix from a filename, if it has it.
334<P>
335<DD><DL>
336<DT><B>Parameters:</B><DD><CODE>filename</CODE> - the filename to strip<DD><CODE>suffix</CODE> - the suffix to remove
337<DT><B>Returns:</B><DD>the shortened filename</DL>
338</DD>
339</DL>
340<HR>
341
342<A NAME="main(java.lang.String[])"><!-- --></A><H3>
343main</H3>
344<PRE>
345public static void <B>main</B>(<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;args)
346                 throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></PRE>
347<DL>
348<DD>A little test program.
349<P>
350<DD><DL>
351<DT><B>Parameters:</B><DD><CODE>args</CODE> -
352<DT><B>Throws:</B>
353<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</A></CODE></DL>
354</DD>
355</DL>
356<!-- ========= END OF CLASS DATA ========= -->
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