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7FSInputStream (Hadoop 0.20.1 API)
8</TITLE>
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58&nbsp;<A HREF="../../../../org/apache/hadoop/fs/FSInputChecker.html" title="class in org.apache.hadoop.fs"><B>PREV CLASS</B></A>&nbsp;
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89<H2>
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91org.apache.hadoop.fs</FONT>
92<BR>
93Class FSInputStream</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="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">java.io.InputStream</A>
97      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.fs.FSInputStream</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>, <A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A>, <A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A></DD>
101</DL>
102<DL>
103<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/fs/FSInputChecker.html" title="class in org.apache.hadoop.fs">FSInputChecker</A>, <A HREF="../../../../org/apache/hadoop/fs/ftp/FTPInputStream.html" title="class in org.apache.hadoop.fs.ftp">FTPInputStream</A></DD>
104</DL>
105<HR>
106<DL>
107<DT><PRE>public abstract class <B>FSInputStream</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</A><DT>implements <A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A>, <A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A></DL>
108</PRE>
109
110<P>
111FSInputStream is a generic old InputStream with a little bit
112 of RAF-style seek ability.
113<P>
114
115<P>
116<HR>
117
118<P>
119
120<!-- ======== CONSTRUCTOR SUMMARY ======== -->
121
122<A NAME="constructor_summary"><!-- --></A>
123<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
124<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
125<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
126<B>Constructor Summary</B></FONT></TH>
127</TR>
128<TR BGCOLOR="white" CLASS="TableRowColor">
129<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#FSInputStream()">FSInputStream</A></B>()</CODE>
130
131<BR>
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
133</TR>
134</TABLE>
135&nbsp;
136<!-- ========== METHOD SUMMARY =========== -->
137
138<A NAME="method_summary"><!-- --></A>
139<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
140<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
141<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
142<B>Method Summary</B></FONT></TH>
143</TR>
144<TR BGCOLOR="white" CLASS="TableRowColor">
145<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
146<CODE>abstract &nbsp;long</CODE></FONT></TD>
147<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#getPos()">getPos</A></B>()</CODE>
148
149<BR>
150&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the current offset from the start of the file</TD>
151</TR>
152<TR BGCOLOR="white" CLASS="TableRowColor">
153<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
154<CODE>&nbsp;int</CODE></FONT></TD>
155<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#read(long, byte[], int, int)">read</A></B>(long&nbsp;position,
156     byte[]&nbsp;buffer,
157     int&nbsp;offset,
158     int&nbsp;length)</CODE>
159
160<BR>
161&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read upto the specified number of bytes, from a given
162 position within a file, and return the number of bytes read.</TD>
163</TR>
164<TR BGCOLOR="white" CLASS="TableRowColor">
165<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
166<CODE>&nbsp;void</CODE></FONT></TD>
167<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#readFully(long, byte[])">readFully</A></B>(long&nbsp;position,
168          byte[]&nbsp;buffer)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read number of bytes equalt to the length of the buffer, from a given
172 position within a file.</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>&nbsp;void</CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#readFully(long, byte[], int, int)">readFully</A></B>(long&nbsp;position,
178          byte[]&nbsp;buffer,
179          int&nbsp;offset,
180          int&nbsp;length)</CODE>
181
182<BR>
183&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read the specified number of bytes, from a given
184 position within a file.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>abstract &nbsp;void</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#seek(long)">seek</A></B>(long&nbsp;pos)</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Seek to the given offset from the start of the file.</TD>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>abstract &nbsp;boolean</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../org/apache/hadoop/fs/FSInputStream.html#seekToNewSource(long)">seekToNewSource</A></B>(long&nbsp;targetPos)</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Seeks a different copy of the data.</TD>
201</TR>
202</TABLE>
203&nbsp;<A NAME="methods_inherited_from_class_java.io.InputStream"><!-- --></A>
204<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
205<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
206<TH ALIGN="left"><B>Methods inherited from class java.io.<A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true" title="class or interface in java.io">InputStream</A></B></TH>
207</TR>
208<TR BGCOLOR="white" CLASS="TableRowColor">
209<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#available()" title="class or interface in java.io">available</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#close()" title="class or interface in java.io">close</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#mark(int)" title="class or interface in java.io">mark</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#markSupported()" title="class or interface in java.io">markSupported</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#read()" title="class or interface in java.io">read</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#read(byte[])" title="class or interface in java.io">read</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#read(byte[], int, int)" title="class or interface in java.io">read</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#reset()" title="class or interface in java.io">reset</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/InputStream.html?is-external=true#skip(long)" title="class or interface in java.io">skip</A></CODE></TD>
210</TR>
211</TABLE>
212&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
213<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
214<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
215<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>
216</TR>
217<TR BGCOLOR="white" CLASS="TableRowColor">
218<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>
219</TR>
220</TABLE>
221&nbsp;
222<P>
223
224<!-- ========= CONSTRUCTOR DETAIL ======== -->
225
226<A NAME="constructor_detail"><!-- --></A>
227<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
228<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
229<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
230<B>Constructor Detail</B></FONT></TH>
231</TR>
232</TABLE>
233
234<A NAME="FSInputStream()"><!-- --></A><H3>
235FSInputStream</H3>
236<PRE>
237public <B>FSInputStream</B>()</PRE>
238<DL>
239</DL>
240
241<!-- ============ METHOD DETAIL ========== -->
242
243<A NAME="method_detail"><!-- --></A>
244<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
245<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
246<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
247<B>Method Detail</B></FONT></TH>
248</TR>
249</TABLE>
250
251<A NAME="seek(long)"><!-- --></A><H3>
252seek</H3>
253<PRE>
254public abstract void <B>seek</B>(long&nbsp;pos)
255                   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>
256<DL>
257<DD>Seek to the given offset from the start of the file.
258 The next read() will be from that location.  Can't
259 seek past the end of the file.
260<P>
261<DD><DL>
262<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html#seek(long)">seek</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A></CODE></DL>
263</DD>
264<DD><DL>
265
266<DT><B>Throws:</B>
267<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>
268</DD>
269</DL>
270<HR>
271
272<A NAME="getPos()"><!-- --></A><H3>
273getPos</H3>
274<PRE>
275public abstract long <B>getPos</B>()
276                     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>
277<DL>
278<DD>Return the current offset from the start of the file
279<P>
280<DD><DL>
281<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html#getPos()">getPos</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A></CODE></DL>
282</DD>
283<DD><DL>
284
285<DT><B>Throws:</B>
286<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>
287</DD>
288</DL>
289<HR>
290
291<A NAME="seekToNewSource(long)"><!-- --></A><H3>
292seekToNewSource</H3>
293<PRE>
294public abstract boolean <B>seekToNewSource</B>(long&nbsp;targetPos)
295                                 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>
296<DL>
297<DD>Seeks a different copy of the data.  Returns true if
298 found a new source, false otherwise.
299<P>
300<DD><DL>
301<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html#seekToNewSource(long)">seekToNewSource</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/Seekable.html" title="interface in org.apache.hadoop.fs">Seekable</A></CODE></DL>
302</DD>
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>
308</DL>
309<HR>
310
311<A NAME="read(long, byte[], int, int)"><!-- --></A><H3>
312read</H3>
313<PRE>
314public int <B>read</B>(long&nbsp;position,
315                byte[]&nbsp;buffer,
316                int&nbsp;offset,
317                int&nbsp;length)
318         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>
319<DL>
320<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#read(long, byte[], int, int)">PositionedReadable</A></CODE></B></DD>
321<DD>Read upto the specified number of bytes, from a given
322 position within a file, and return the number of bytes read. This does not
323 change the current offset of a file, and is thread-safe.
324<P>
325<DD><DL>
326<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#read(long, byte[], int, int)">read</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A></CODE></DL>
327</DD>
328<DD><DL>
329
330<DT><B>Throws:</B>
331<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>
332</DD>
333</DL>
334<HR>
335
336<A NAME="readFully(long, byte[], int, int)"><!-- --></A><H3>
337readFully</H3>
338<PRE>
339public void <B>readFully</B>(long&nbsp;position,
340                      byte[]&nbsp;buffer,
341                      int&nbsp;offset,
342                      int&nbsp;length)
343               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>
344<DL>
345<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#readFully(long, byte[], int, int)">PositionedReadable</A></CODE></B></DD>
346<DD>Read the specified number of bytes, from a given
347 position within a file. This does not
348 change the current offset of a file, and is thread-safe.
349<P>
350<DD><DL>
351<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#readFully(long, byte[], int, int)">readFully</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A></CODE></DL>
352</DD>
353<DD><DL>
354
355<DT><B>Throws:</B>
356<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>
357</DD>
358</DL>
359<HR>
360
361<A NAME="readFully(long, byte[])"><!-- --></A><H3>
362readFully</H3>
363<PRE>
364public void <B>readFully</B>(long&nbsp;position,
365                      byte[]&nbsp;buffer)
366               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>
367<DL>
368<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#readFully(long, byte[])">PositionedReadable</A></CODE></B></DD>
369<DD>Read number of bytes equalt to the length of the buffer, from a given
370 position within a file. This does not
371 change the current offset of a file, and is thread-safe.
372<P>
373<DD><DL>
374<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html#readFully(long, byte[])">readFully</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/fs/PositionedReadable.html" title="interface in org.apache.hadoop.fs">PositionedReadable</A></CODE></DL>
375</DD>
376<DD><DL>
377
378<DT><B>Throws:</B>
379<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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