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7DataInputBuffer (Hadoop 0.20.1 API)
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91org.apache.hadoop.io</FONT>
92<BR>
93Class DataInputBuffer</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 "><A HREF="http://java.sun.com/javase/6/docs/api/java/io/FilterInputStream.html?is-external=true" title="class or interface in java.io">java.io.FilterInputStream</A>
98          <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">java.io.DataInputStream</A>
99              <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.io.DataInputBuffer</B>
100</PRE>
101<DL>
102<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="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public class <B>DataInputBuffer</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</A></DL>
107</PRE>
108
109<P>
110A reusable <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io"><CODE>DataInput</CODE></A> implementation that reads from an in-memory
111 buffer.
112
113 <p>This saves memory over creating a new DataInputStream and
114 ByteArrayInputStream each time data is read.
115
116 <p>Typical usage is something like the following:<pre>
117
118 DataInputBuffer buffer = new DataInputBuffer();
119 while (... loop condition ...) {
120   byte[] data = ... get data ...;
121   int dataLength = ... get data length ...;
122   buffer.reset(data, dataLength);
123   ... read buffer using DataInput methods ...
124 }
125 </pre>
126<P>
127
128<P>
129<HR>
130
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132<!-- =========== FIELD SUMMARY =========== -->
133
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138<B>Field Summary</B></FONT></TH>
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140</TABLE>
141&nbsp;<A NAME="fields_inherited_from_class_java.io.FilterInputStream"><!-- --></A>
142<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
143<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
144<TH ALIGN="left"><B>Fields inherited from class java.io.<A HREF="http://java.sun.com/javase/6/docs/api/java/io/FilterInputStream.html?is-external=true" title="class or interface in java.io">FilterInputStream</A></B></TH>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/FilterInputStream.html?is-external=true#in" title="class or interface in java.io">in</A></CODE></TD>
148</TR>
149</TABLE>
150&nbsp;
151<!-- ======== CONSTRUCTOR SUMMARY ======== -->
152
153<A NAME="constructor_summary"><!-- --></A>
154<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
155<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
156<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
157<B>Constructor Summary</B></FONT></TH>
158</TR>
159<TR BGCOLOR="white" CLASS="TableRowColor">
160<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#DataInputBuffer()">DataInputBuffer</A></B>()</CODE>
161
162<BR>
163&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a new empty buffer.</TD>
164</TR>
165</TABLE>
166&nbsp;
167<!-- ========== METHOD SUMMARY =========== -->
168
169<A NAME="method_summary"><!-- --></A>
170<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
171<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
172<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
173<B>Method Summary</B></FONT></TH>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>&nbsp;byte[]</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#getData()">getData</A></B>()</CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
182</TR>
183<TR BGCOLOR="white" CLASS="TableRowColor">
184<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
185<CODE>&nbsp;int</CODE></FONT></TD>
186<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#getLength()">getLength</A></B>()</CODE>
187
188<BR>
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the length of the input.</TD>
190</TR>
191<TR BGCOLOR="white" CLASS="TableRowColor">
192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
193<CODE>&nbsp;int</CODE></FONT></TD>
194<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#getPosition()">getPosition</A></B>()</CODE>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the current position in the input.</TD>
198</TR>
199<TR BGCOLOR="white" CLASS="TableRowColor">
200<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
201<CODE>&nbsp;void</CODE></FONT></TD>
202<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#reset(byte[], int)">reset</A></B>(byte[]&nbsp;input,
203      int&nbsp;length)</CODE>
204
205<BR>
206&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resets the data that the buffer reads.</TD>
207</TR>
208<TR BGCOLOR="white" CLASS="TableRowColor">
209<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
210<CODE>&nbsp;void</CODE></FONT></TD>
211<TD><CODE><B><A HREF="../../../../org/apache/hadoop/io/DataInputBuffer.html#reset(byte[], int, int)">reset</A></B>(byte[]&nbsp;input,
212      int&nbsp;start,
213      int&nbsp;length)</CODE>
214
215<BR>
216&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resets the data that the buffer reads.</TD>
217</TR>
218</TABLE>
219&nbsp;<A NAME="methods_inherited_from_class_java.io.DataInputStream"><!-- --></A>
220<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
221<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
222<TH ALIGN="left"><B>Methods inherited from class java.io.<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</A></B></TH>
223</TR>
224<TR BGCOLOR="white" CLASS="TableRowColor">
225<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.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/DataInputStream.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/DataInputStream.html?is-external=true#readBoolean()" title="class or interface in java.io">readBoolean</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readByte()" title="class or interface in java.io">readByte</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readChar()" title="class or interface in java.io">readChar</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readDouble()" title="class or interface in java.io">readDouble</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readFloat()" title="class or interface in java.io">readFloat</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readFully(byte[])" title="class or interface in java.io">readFully</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readFully(byte[], int, int)" title="class or interface in java.io">readFully</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readInt()" title="class or interface in java.io">readInt</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readLine()" title="class or interface in java.io">readLine</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readLong()" title="class or interface in java.io">readLong</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readShort()" title="class or interface in java.io">readShort</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readUnsignedByte()" title="class or interface in java.io">readUnsignedByte</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readUnsignedShort()" title="class or interface in java.io">readUnsignedShort</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readUTF()" title="class or interface in java.io">readUTF</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#readUTF(java.io.DataInput)" title="class or interface in java.io">readUTF</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInputStream.html?is-external=true#skipBytes(int)" title="class or interface in java.io">skipBytes</A></CODE></TD>
226</TR>
227</TABLE>
228&nbsp;<A NAME="methods_inherited_from_class_java.io.FilterInputStream"><!-- --></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.io.<A HREF="http://java.sun.com/javase/6/docs/api/java/io/FilterInputStream.html?is-external=true" title="class or interface in java.io">FilterInputStream</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/io/FilterInputStream.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/FilterInputStream.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/FilterInputStream.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/FilterInputStream.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/FilterInputStream.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/FilterInputStream.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/FilterInputStream.html?is-external=true#skip(long)" title="class or interface in java.io">skip</A></CODE></TD>
235</TR>
236</TABLE>
237&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
238<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
239<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
240<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>
241</TR>
242<TR BGCOLOR="white" CLASS="TableRowColor">
243<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>
244</TR>
245</TABLE>
246&nbsp;
247<P>
248
249<!-- ========= CONSTRUCTOR DETAIL ======== -->
250
251<A NAME="constructor_detail"><!-- --></A>
252<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
253<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
254<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
255<B>Constructor Detail</B></FONT></TH>
256</TR>
257</TABLE>
258
259<A NAME="DataInputBuffer()"><!-- --></A><H3>
260DataInputBuffer</H3>
261<PRE>
262public <B>DataInputBuffer</B>()</PRE>
263<DL>
264<DD>Constructs a new empty buffer.
265<P>
266</DL>
267
268<!-- ============ METHOD DETAIL ========== -->
269
270<A NAME="method_detail"><!-- --></A>
271<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
272<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
273<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
274<B>Method Detail</B></FONT></TH>
275</TR>
276</TABLE>
277
278<A NAME="reset(byte[], int)"><!-- --></A><H3>
279reset</H3>
280<PRE>
281public void <B>reset</B>(byte[]&nbsp;input,
282                  int&nbsp;length)</PRE>
283<DL>
284<DD>Resets the data that the buffer reads.
285<P>
286<DD><DL>
287</DL>
288</DD>
289</DL>
290<HR>
291
292<A NAME="reset(byte[], int, int)"><!-- --></A><H3>
293reset</H3>
294<PRE>
295public void <B>reset</B>(byte[]&nbsp;input,
296                  int&nbsp;start,
297                  int&nbsp;length)</PRE>
298<DL>
299<DD>Resets the data that the buffer reads.
300<P>
301<DD><DL>
302</DL>
303</DD>
304</DL>
305<HR>
306
307<A NAME="getData()"><!-- --></A><H3>
308getData</H3>
309<PRE>
310public byte[] <B>getData</B>()</PRE>
311<DL>
312<DD><DL>
313</DL>
314</DD>
315</DL>
316<HR>
317
318<A NAME="getPosition()"><!-- --></A><H3>
319getPosition</H3>
320<PRE>
321public int <B>getPosition</B>()</PRE>
322<DL>
323<DD>Returns the current position in the input.
324<P>
325<DD><DL>
326</DL>
327</DD>
328</DL>
329<HR>
330
331<A NAME="getLength()"><!-- --></A><H3>
332getLength</H3>
333<PRE>
334public int <B>getLength</B>()</PRE>
335<DL>
336<DD>Returns the length of the input.
337<P>
338<DD><DL>
339</DL>
340</DD>
341</DL>
342<!-- ========= END OF CLASS DATA ========= -->
343<HR>
344
345
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