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7LineReader (Hadoop 0.20.1 API)
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91org.apache.hadoop.util</FONT>
92<BR>
93Class LineReader</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.util.LineReader</B>
97</PRE>
98<DL>
99<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.LineReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader.LineReader</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>LineReader</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>
104</PRE>
105
106<P>
107A class that provides a line reader from an input stream.
108<P>
109
110<P>
111<HR>
112
113<P>
114
115<!-- ======== CONSTRUCTOR SUMMARY ======== -->
116
117<A NAME="constructor_summary"><!-- --></A>
118<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
119<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
120<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
121<B>Constructor Summary</B></FONT></TH>
122</TR>
123<TR BGCOLOR="white" CLASS="TableRowColor">
124<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#LineReader(java.io.InputStream)">LineReader</A></B>(<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>&nbsp;in)</CODE>
125
126<BR>
127&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a line reader that reads from the given stream using the
128 default buffer-size (64k).</TD>
129</TR>
130<TR BGCOLOR="white" CLASS="TableRowColor">
131<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#LineReader(java.io.InputStream, org.apache.hadoop.conf.Configuration)">LineReader</A></B>(<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>&nbsp;in,
132           <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
133
134<BR>
135&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a line reader that reads from the given stream using the
136 <code>io.file.buffer.size</code> specified in the given
137 <code>Configuration</code>.</TD>
138</TR>
139<TR BGCOLOR="white" CLASS="TableRowColor">
140<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#LineReader(java.io.InputStream, int)">LineReader</A></B>(<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>&nbsp;in,
141           int&nbsp;bufferSize)</CODE>
142
143<BR>
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create a line reader that reads from the given stream using the
145 given buffer-size.</TD>
146</TR>
147</TABLE>
148&nbsp;
149<!-- ========== METHOD SUMMARY =========== -->
150
151<A NAME="method_summary"><!-- --></A>
152<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
153<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
154<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
155<B>Method Summary</B></FONT></TH>
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/util/LineReader.html#close()">close</A></B>()</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close the underlying stream.</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>&nbsp;int</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#readLine(org.apache.hadoop.io.Text)">readLine</A></B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read from the InputStream into the given Text.</TD>
172</TR>
173<TR BGCOLOR="white" CLASS="TableRowColor">
174<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
175<CODE>&nbsp;int</CODE></FONT></TD>
176<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#readLine(org.apache.hadoop.io.Text, int)">readLine</A></B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str,
177         int&nbsp;maxLineLength)</CODE>
178
179<BR>
180&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read from the InputStream into the given Text.</TD>
181</TR>
182<TR BGCOLOR="white" CLASS="TableRowColor">
183<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
184<CODE>&nbsp;int</CODE></FONT></TD>
185<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/LineReader.html#readLine(org.apache.hadoop.io.Text, int, int)">readLine</A></B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str,
186         int&nbsp;maxLineLength,
187         int&nbsp;maxBytesToConsume)</CODE>
188
189<BR>
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Read one line from the InputStream into the given Text.</TD>
191</TR>
192</TABLE>
193&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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196<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>
197</TR>
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200</TR>
201</TABLE>
202&nbsp;
203<P>
204
205<!-- ========= CONSTRUCTOR DETAIL ======== -->
206
207<A NAME="constructor_detail"><!-- --></A>
208<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
209<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
210<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
211<B>Constructor Detail</B></FONT></TH>
212</TR>
213</TABLE>
214
215<A NAME="LineReader(java.io.InputStream)"><!-- --></A><H3>
216LineReader</H3>
217<PRE>
218public <B>LineReader</B>(<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>&nbsp;in)</PRE>
219<DL>
220<DD>Create a line reader that reads from the given stream using the
221 default buffer-size (64k).
222<P>
223<DL>
224<DT><B>Parameters:</B><DD><CODE>in</CODE> - The input stream
225<DT><B>Throws:</B>
226<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>
227</DL>
228<HR>
229
230<A NAME="LineReader(java.io.InputStream, int)"><!-- --></A><H3>
231LineReader</H3>
232<PRE>
233public <B>LineReader</B>(<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>&nbsp;in,
234                  int&nbsp;bufferSize)</PRE>
235<DL>
236<DD>Create a line reader that reads from the given stream using the
237 given buffer-size.
238<P>
239<DL>
240<DT><B>Parameters:</B><DD><CODE>in</CODE> - The input stream<DD><CODE>bufferSize</CODE> - Size of the read buffer
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<HR>
245
246<A NAME="LineReader(java.io.InputStream, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
247LineReader</H3>
248<PRE>
249public <B>LineReader</B>(<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>&nbsp;in,
250                  <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)
251           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>
252<DL>
253<DD>Create a line reader that reads from the given stream using the
254 <code>io.file.buffer.size</code> specified in the given
255 <code>Configuration</code>.
256<P>
257<DL>
258<DT><B>Parameters:</B><DD><CODE>in</CODE> - input stream<DD><CODE>conf</CODE> - configuration
259<DT><B>Throws:</B>
260<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>
261</DL>
262
263<!-- ============ METHOD DETAIL ========== -->
264
265<A NAME="method_detail"><!-- --></A>
266<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
267<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
268<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
269<B>Method Detail</B></FONT></TH>
270</TR>
271</TABLE>
272
273<A NAME="close()"><!-- --></A><H3>
274close</H3>
275<PRE>
276public void <B>close</B>()
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>Close the underlying stream.
280<P>
281<DD><DL>
282
283<DT><B>Throws:</B>
284<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>
285</DD>
286</DL>
287<HR>
288
289<A NAME="readLine(org.apache.hadoop.io.Text, int, int)"><!-- --></A><H3>
290readLine</H3>
291<PRE>
292public int <B>readLine</B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str,
293                    int&nbsp;maxLineLength,
294                    int&nbsp;maxBytesToConsume)
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>Read one line from the InputStream into the given Text.  A line
298 can be terminated by one of the following: '\n' (LF) , '\r' (CR),
299 or '\r\n' (CR+LF).  EOF also terminates an otherwise unterminated
300 line.
301<P>
302<DD><DL>
303<DT><B>Parameters:</B><DD><CODE>str</CODE> - the object to store the given line (without newline)<DD><CODE>maxLineLength</CODE> - the maximum number of bytes to store into str;
304  the rest of the line is silently discarded.<DD><CODE>maxBytesToConsume</CODE> - the maximum number of bytes to consume
305  in this call.  This is only a hint, because if the line cross
306  this threshold, we allow it to happen.  It can overshoot
307  potentially by as much as one buffer length.
308<DT><B>Returns:</B><DD>the number of bytes read including the (longest) newline
309 found.
310<DT><B>Throws:</B>
311<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> - if the underlying stream throws</DL>
312</DD>
313</DL>
314<HR>
315
316<A NAME="readLine(org.apache.hadoop.io.Text, int)"><!-- --></A><H3>
317readLine</H3>
318<PRE>
319public int <B>readLine</B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str,
320                    int&nbsp;maxLineLength)
321             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>
322<DL>
323<DD>Read from the InputStream into the given Text.
324<P>
325<DD><DL>
326<DT><B>Parameters:</B><DD><CODE>str</CODE> - the object to store the given line<DD><CODE>maxLineLength</CODE> - the maximum number of bytes to store into str.
327<DT><B>Returns:</B><DD>the number of bytes read including the newline
328<DT><B>Throws:</B>
329<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> - if the underlying stream throws</DL>
330</DD>
331</DL>
332<HR>
333
334<A NAME="readLine(org.apache.hadoop.io.Text)"><!-- --></A><H3>
335readLine</H3>
336<PRE>
337public int <B>readLine</B>(<A HREF="../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</A>&nbsp;str)
338             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>
339<DL>
340<DD>Read from the InputStream into the given Text.
341<P>
342<DD><DL>
343<DT><B>Parameters:</B><DD><CODE>str</CODE> - the object to store the given line
344<DT><B>Returns:</B><DD>the number of bytes read including the newline
345<DT><B>Throws:</B>
346<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> - if the underlying stream throws</DL>
347</DD>
348</DL>
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