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7Utils (Hadoop 0.20.1 API)
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91org.apache.hadoop.record</FONT>
92<BR>
93Class Utils</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.record.Utils</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>Utils</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>
104Various utility functions for Hadooop record I/O runtime.
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;char[]</CODE></FONT></TD>
122<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#hexchars">hexchars</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<!-- ========== METHOD SUMMARY =========== -->
130
131<A NAME="method_summary"><!-- --></A>
132<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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134<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
135<B>Method Summary</B></FONT></TH>
136</TR>
137<TR BGCOLOR="white" CLASS="TableRowColor">
138<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
139<CODE>static&nbsp;int</CODE></FONT></TD>
140<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#compareBytes(byte[], int, int, byte[], int, int)">compareBytes</A></B>(byte[]&nbsp;b1,
141             int&nbsp;s1,
142             int&nbsp;l1,
143             byte[]&nbsp;b2,
144             int&nbsp;s2,
145             int&nbsp;l2)</CODE>
146
147<BR>
148&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Lexicographic order of binary data.</TD>
149</TR>
150<TR BGCOLOR="white" CLASS="TableRowColor">
151<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
152<CODE>static&nbsp;int</CODE></FONT></TD>
153<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#getVIntSize(long)">getVIntSize</A></B>(long&nbsp;i)</CODE>
154
155<BR>
156&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the encoded length if an integer is stored in a variable-length format</TD>
157</TR>
158<TR BGCOLOR="white" CLASS="TableRowColor">
159<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
160<CODE>static&nbsp;double</CODE></FONT></TD>
161<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readDouble(byte[], int)">readDouble</A></B>(byte[]&nbsp;bytes,
162           int&nbsp;start)</CODE>
163
164<BR>
165&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse a double from a byte array.</TD>
166</TR>
167<TR BGCOLOR="white" CLASS="TableRowColor">
168<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
169<CODE>static&nbsp;float</CODE></FONT></TD>
170<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readFloat(byte[], int)">readFloat</A></B>(byte[]&nbsp;bytes,
171          int&nbsp;start)</CODE>
172
173<BR>
174&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Parse a float from a byte array.</TD>
175</TR>
176<TR BGCOLOR="white" CLASS="TableRowColor">
177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
178<CODE>static&nbsp;int</CODE></FONT></TD>
179<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readVInt(byte[], int)">readVInt</A></B>(byte[]&nbsp;bytes,
180         int&nbsp;start)</CODE>
181
182<BR>
183&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded integer from a byte array and returns it.</TD>
184</TR>
185<TR BGCOLOR="white" CLASS="TableRowColor">
186<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
187<CODE>static&nbsp;int</CODE></FONT></TD>
188<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readVInt(java.io.DataInput)">readVInt</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>
189
190<BR>
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded integer from a stream and returns it.</TD>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
195<CODE>static&nbsp;long</CODE></FONT></TD>
196<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readVLong(byte[], int)">readVLong</A></B>(byte[]&nbsp;bytes,
197          int&nbsp;start)</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded long from a byte array and returns it.</TD>
201</TR>
202<TR BGCOLOR="white" CLASS="TableRowColor">
203<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
204<CODE>static&nbsp;long</CODE></FONT></TD>
205<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#readVLong(java.io.DataInput)">readVLong</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>
206
207<BR>
208&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Reads a zero-compressed encoded long from a stream and return it.</TD>
209</TR>
210<TR BGCOLOR="white" CLASS="TableRowColor">
211<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
212<CODE>static&nbsp;void</CODE></FONT></TD>
213<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#writeVInt(java.io.DataOutput, int)">writeVInt</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;stream,
214          int&nbsp;i)</CODE>
215
216<BR>
217&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serializes an int to a binary stream with zero-compressed encoding.</TD>
218</TR>
219<TR BGCOLOR="white" CLASS="TableRowColor">
220<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
221<CODE>static&nbsp;void</CODE></FONT></TD>
222<TD><CODE><B><A HREF="../../../../org/apache/hadoop/record/Utils.html#writeVLong(java.io.DataOutput, long)">writeVLong</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;stream,
223           long&nbsp;i)</CODE>
224
225<BR>
226&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Serializes a long to a binary stream with zero-compressed encoding.</TD>
227</TR>
228</TABLE>
229&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
230<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
231<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
232<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>
233</TR>
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235<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>
236</TR>
237</TABLE>
238&nbsp;
239<P>
240
241<!-- ============ FIELD DETAIL =========== -->
242
243<A NAME="field_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>Field Detail</B></FONT></TH>
248</TR>
249</TABLE>
250
251<A NAME="hexchars"><!-- --></A><H3>
252hexchars</H3>
253<PRE>
254public static final char[] <B>hexchars</B></PRE>
255<DL>
256<DL>
257</DL>
258</DL>
259
260<!-- ============ METHOD DETAIL ========== -->
261
262<A NAME="method_detail"><!-- --></A>
263<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
264<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
265<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
266<B>Method Detail</B></FONT></TH>
267</TR>
268</TABLE>
269
270<A NAME="readFloat(byte[], int)"><!-- --></A><H3>
271readFloat</H3>
272<PRE>
273public static float <B>readFloat</B>(byte[]&nbsp;bytes,
274                              int&nbsp;start)</PRE>
275<DL>
276<DD>Parse a float from a byte array.
277<P>
278<DD><DL>
279</DL>
280</DD>
281</DL>
282<HR>
283
284<A NAME="readDouble(byte[], int)"><!-- --></A><H3>
285readDouble</H3>
286<PRE>
287public static double <B>readDouble</B>(byte[]&nbsp;bytes,
288                                int&nbsp;start)</PRE>
289<DL>
290<DD>Parse a double from a byte array.
291<P>
292<DD><DL>
293</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="readVLong(byte[], int)"><!-- --></A><H3>
299readVLong</H3>
300<PRE>
301public static long <B>readVLong</B>(byte[]&nbsp;bytes,
302                             int&nbsp;start)
303                      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>
304<DL>
305<DD>Reads a zero-compressed encoded long from a byte array and returns it.
306<P>
307<DD><DL>
308<DT><B>Parameters:</B><DD><CODE>bytes</CODE> - byte array with decode long<DD><CODE>start</CODE> - starting index
309<DT><B>Returns:</B><DD>deserialized long
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></DL>
312</DD>
313</DL>
314<HR>
315
316<A NAME="readVInt(byte[], int)"><!-- --></A><H3>
317readVInt</H3>
318<PRE>
319public static int <B>readVInt</B>(byte[]&nbsp;bytes,
320                           int&nbsp;start)
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>Reads a zero-compressed encoded integer from a byte array and returns it.
324<P>
325<DD><DL>
326<DT><B>Parameters:</B><DD><CODE>bytes</CODE> - byte array with the encoded integer<DD><CODE>start</CODE> - start index
327<DT><B>Returns:</B><DD>deserialized integer
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></DL>
330</DD>
331</DL>
332<HR>
333
334<A NAME="readVLong(java.io.DataInput)"><!-- --></A><H3>
335readVLong</H3>
336<PRE>
337public static long <B>readVLong</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)
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>Reads a zero-compressed encoded long from a stream and return it.
341<P>
342<DD><DL>
343<DT><B>Parameters:</B><DD><CODE>in</CODE> - input stream
344<DT><B>Returns:</B><DD>deserialized long
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></DL>
347</DD>
348</DL>
349<HR>
350
351<A NAME="readVInt(java.io.DataInput)"><!-- --></A><H3>
352readVInt</H3>
353<PRE>
354public static int <B>readVInt</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)
355                    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>
356<DL>
357<DD>Reads a zero-compressed encoded integer from a stream and returns it.
358<P>
359<DD><DL>
360<DT><B>Parameters:</B><DD><CODE>in</CODE> - input stream
361<DT><B>Returns:</B><DD>deserialized integer
362<DT><B>Throws:</B>
363<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>
364</DD>
365</DL>
366<HR>
367
368<A NAME="getVIntSize(long)"><!-- --></A><H3>
369getVIntSize</H3>
370<PRE>
371public static int <B>getVIntSize</B>(long&nbsp;i)</PRE>
372<DL>
373<DD>Get the encoded length if an integer is stored in a variable-length format
374<P>
375<DD><DL>
376
377<DT><B>Returns:</B><DD>the encoded length</DL>
378</DD>
379</DL>
380<HR>
381
382<A NAME="writeVLong(java.io.DataOutput, long)"><!-- --></A><H3>
383writeVLong</H3>
384<PRE>
385public static void <B>writeVLong</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;stream,
386                              long&nbsp;i)
387                       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>
388<DL>
389<DD>Serializes a long to a binary stream with zero-compressed encoding.
390 For -112 <= i <= 127, only one byte is used with the actual value.
391 For other values of i, the first byte value indicates whether the
392 long is positive or negative, and the number of bytes that follow.
393 If the first byte value v is between -113 and -120, the following long
394 is positive, with number of bytes that follow are -(v+112).
395 If the first byte value v is between -121 and -128, the following long
396 is negative, with number of bytes that follow are -(v+120). Bytes are
397 stored in the high-non-zero-byte-first order.
398<P>
399<DD><DL>
400<DT><B>Parameters:</B><DD><CODE>stream</CODE> - Binary output stream<DD><CODE>i</CODE> - Long to be serialized
401<DT><B>Throws:</B>
402<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>
403</DD>
404</DL>
405<HR>
406
407<A NAME="writeVInt(java.io.DataOutput, int)"><!-- --></A><H3>
408writeVInt</H3>
409<PRE>
410public static void <B>writeVInt</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;stream,
411                             int&nbsp;i)
412                      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>
413<DL>
414<DD>Serializes an int to a binary stream with zero-compressed encoding.
415<P>
416<DD><DL>
417<DT><B>Parameters:</B><DD><CODE>stream</CODE> - Binary output stream<DD><CODE>i</CODE> - int to be serialized
418<DT><B>Throws:</B>
419<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>
420</DD>
421</DL>
422<HR>
423
424<A NAME="compareBytes(byte[], int, int, byte[], int, int)"><!-- --></A><H3>
425compareBytes</H3>
426<PRE>
427public static int <B>compareBytes</B>(byte[]&nbsp;b1,
428                               int&nbsp;s1,
429                               int&nbsp;l1,
430                               byte[]&nbsp;b2,
431                               int&nbsp;s2,
432                               int&nbsp;l2)</PRE>
433<DL>
434<DD>Lexicographic order of binary data.
435<P>
436<DD><DL>
437</DL>
438</DD>
439</DL>
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