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7ReflectionUtils (Hadoop 0.20.1 API)
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91org.apache.hadoop.util</FONT>
92<BR>
93Class ReflectionUtils</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.ReflectionUtils</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>ReflectionUtils</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>
104General reflection utils
105<P>
106
107<P>
108<HR>
109
110<P>
111
112<!-- ======== CONSTRUCTOR SUMMARY ======== -->
113
114<A NAME="constructor_summary"><!-- --></A>
115<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
116<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
117<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
118<B>Constructor Summary</B></FONT></TH>
119</TR>
120<TR BGCOLOR="white" CLASS="TableRowColor">
121<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#ReflectionUtils()">ReflectionUtils</A></B>()</CODE>
122
123<BR>
124&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
125</TR>
126</TABLE>
127&nbsp;
128<!-- ========== METHOD SUMMARY =========== -->
129
130<A NAME="method_summary"><!-- --></A>
131<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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133<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
134<B>Method Summary</B></FONT></TH>
135</TR>
136<TR BGCOLOR="white" CLASS="TableRowColor">
137<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
138<CODE>static&nbsp;void</CODE></FONT></TD>
139<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#cloneWritableInto(org.apache.hadoop.io.Writable, org.apache.hadoop.io.Writable)">cloneWritableInto</A></B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;dst,
140                  <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;src)</CODE>
141
142<BR>
143&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;</TD>
144</TR>
145<TR BGCOLOR="white" CLASS="TableRowColor">
146<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
147<CODE>static
148<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
149<TR ALIGN="right" VALIGN="">
150<TD NOWRAP><FONT SIZE="-1">
151<CODE>&lt;T&gt; T</CODE></FONT></TD>
152</TR>
153</TABLE>
154</CODE></FONT></TD>
155<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#copy(org.apache.hadoop.conf.Configuration, T, T)">copy</A></B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
156     T&nbsp;src,
157     T&nbsp;dst)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Make a copy of the writable object using serialization to a buffer</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>static
165<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
166<TR ALIGN="right" VALIGN="">
167<TD NOWRAP><FONT SIZE="-1">
168<CODE>&lt;T&gt; <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;T&gt;</CODE></FONT></TD>
169</TR>
170</TABLE>
171</CODE></FONT></TD>
172<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#getClass(T)">getClass</A></B>(T&nbsp;o)</CODE>
173
174<BR>
175&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the correctly-typed <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang"><CODE>Class</CODE></A> of the given object.</TD>
176</TR>
177<TR BGCOLOR="white" CLASS="TableRowColor">
178<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
179<CODE>static&nbsp;void</CODE></FONT></TD>
180<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#logThreadInfo(org.apache.commons.logging.Log, java.lang.String, long)">logThreadInfo</A></B>(org.apache.commons.logging.Log&nbsp;log,
181              <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;title,
182              long&nbsp;minInterval)</CODE>
183
184<BR>
185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Log the current thread stacks at INFO level.</TD>
186</TR>
187<TR BGCOLOR="white" CLASS="TableRowColor">
188<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
189<CODE>static
190<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
191<TR ALIGN="right" VALIGN="">
192<TD NOWRAP><FONT SIZE="-1">
193<CODE>&lt;T&gt; T</CODE></FONT></TD>
194</TR>
195</TABLE>
196</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#newInstance(java.lang.Class, org.apache.hadoop.conf.Configuration)">newInstance</A></B>(<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;T&gt;&nbsp;theClass,
198            <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
199
200<BR>
201&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an object for the given class and initialize it from conf</TD>
202</TR>
203<TR BGCOLOR="white" CLASS="TableRowColor">
204<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
205<CODE>static&nbsp;void</CODE></FONT></TD>
206<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#printThreadInfo(java.io.PrintWriter, java.lang.String)">printThreadInfo</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/PrintWriter.html?is-external=true" title="class or interface in java.io">PrintWriter</A>&nbsp;stream,
207                <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;title)</CODE>
208
209<BR>
210&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Print all of the thread's information and stack traces.</TD>
211</TR>
212<TR BGCOLOR="white" CLASS="TableRowColor">
213<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
214<CODE>static&nbsp;void</CODE></FONT></TD>
215<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#setConf(java.lang.Object, org.apache.hadoop.conf.Configuration)">setConf</A></B>(<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>&nbsp;theObject,
216        <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</CODE>
217
218<BR>
219&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Check and set 'configuration' if necessary.</TD>
220</TR>
221<TR BGCOLOR="white" CLASS="TableRowColor">
222<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
223<CODE>static&nbsp;void</CODE></FONT></TD>
224<TD><CODE><B><A HREF="../../../../org/apache/hadoop/util/ReflectionUtils.html#setContentionTracing(boolean)">setContentionTracing</A></B>(boolean&nbsp;val)</CODE>
225
226<BR>
227&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
228</TR>
229</TABLE>
230&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
231<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
232<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
233<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>
234</TR>
235<TR BGCOLOR="white" CLASS="TableRowColor">
236<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>
237</TR>
238</TABLE>
239&nbsp;
240<P>
241
242<!-- ========= CONSTRUCTOR DETAIL ======== -->
243
244<A NAME="constructor_detail"><!-- --></A>
245<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
246<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
247<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
248<B>Constructor Detail</B></FONT></TH>
249</TR>
250</TABLE>
251
252<A NAME="ReflectionUtils()"><!-- --></A><H3>
253ReflectionUtils</H3>
254<PRE>
255public <B>ReflectionUtils</B>()</PRE>
256<DL>
257</DL>
258
259<!-- ============ METHOD DETAIL ========== -->
260
261<A NAME="method_detail"><!-- --></A>
262<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
263<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
264<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
265<B>Method Detail</B></FONT></TH>
266</TR>
267</TABLE>
268
269<A NAME="setConf(java.lang.Object, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
270setConf</H3>
271<PRE>
272public static void <B>setConf</B>(<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>&nbsp;theObject,
273                           <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
274<DL>
275<DD>Check and set 'configuration' if necessary.
276<P>
277<DD><DL>
278<DT><B>Parameters:</B><DD><CODE>theObject</CODE> - object for which to set configuration<DD><CODE>conf</CODE> - Configuration</DL>
279</DD>
280</DL>
281<HR>
282
283<A NAME="newInstance(java.lang.Class, org.apache.hadoop.conf.Configuration)"><!-- --></A><H3>
284newInstance</H3>
285<PRE>
286public static &lt;T&gt; T <B>newInstance</B>(<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;T&gt;&nbsp;theClass,
287                                <A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf)</PRE>
288<DL>
289<DD>Create an object for the given class and initialize it from conf
290<P>
291<DD><DL>
292<DT><B>Parameters:</B><DD><CODE>theClass</CODE> - class of which an object is created<DD><CODE>conf</CODE> - Configuration
293<DT><B>Returns:</B><DD>a new object</DL>
294</DD>
295</DL>
296<HR>
297
298<A NAME="setContentionTracing(boolean)"><!-- --></A><H3>
299setContentionTracing</H3>
300<PRE>
301public static void <B>setContentionTracing</B>(boolean&nbsp;val)</PRE>
302<DL>
303<DD><DL>
304</DL>
305</DD>
306</DL>
307<HR>
308
309<A NAME="printThreadInfo(java.io.PrintWriter, java.lang.String)"><!-- --></A><H3>
310printThreadInfo</H3>
311<PRE>
312public static void <B>printThreadInfo</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/PrintWriter.html?is-external=true" title="class or interface in java.io">PrintWriter</A>&nbsp;stream,
313                                   <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;title)</PRE>
314<DL>
315<DD>Print all of the thread's information and stack traces.
316<P>
317<DD><DL>
318<DT><B>Parameters:</B><DD><CODE>stream</CODE> - the stream to<DD><CODE>title</CODE> - a string title for the stack trace</DL>
319</DD>
320</DL>
321<HR>
322
323<A NAME="logThreadInfo(org.apache.commons.logging.Log, java.lang.String, long)"><!-- --></A><H3>
324logThreadInfo</H3>
325<PRE>
326public static void <B>logThreadInfo</B>(org.apache.commons.logging.Log&nbsp;log,
327                                 <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;title,
328                                 long&nbsp;minInterval)</PRE>
329<DL>
330<DD>Log the current thread stacks at INFO level.
331<P>
332<DD><DL>
333<DT><B>Parameters:</B><DD><CODE>log</CODE> - the logger that logs the stack trace<DD><CODE>title</CODE> - a descriptive title for the call stacks<DD><CODE>minInterval</CODE> - the minimum time from the last</DL>
334</DD>
335</DL>
336<HR>
337
338<A NAME="getClass(java.lang.Object)"><!-- --></A><A NAME="getClass(T)"><!-- --></A><H3>
339getClass</H3>
340<PRE>
341public static &lt;T&gt; <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;T&gt; <B>getClass</B>(T&nbsp;o)</PRE>
342<DL>
343<DD>Return the correctly-typed <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang"><CODE>Class</CODE></A> of the given object.
344<P>
345<DD><DL>
346<DT><B>Parameters:</B><DD><CODE>o</CODE> - object whose correctly-typed <code>Class</code> is to be obtained
347<DT><B>Returns:</B><DD>the correctly typed <code>Class</code> of the given object.</DL>
348</DD>
349</DL>
350<HR>
351
352<A NAME="copy(org.apache.hadoop.conf.Configuration,java.lang.Object,java.lang.Object)"><!-- --></A><A NAME="copy(org.apache.hadoop.conf.Configuration, T, T)"><!-- --></A><H3>
353copy</H3>
354<PRE>
355public static &lt;T&gt; T <B>copy</B>(<A HREF="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</A>&nbsp;conf,
356                         T&nbsp;src,
357                         T&nbsp;dst)
358              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>
359<DL>
360<DD>Make a copy of the writable object using serialization to a buffer
361<P>
362<DD><DL>
363<DT><B>Parameters:</B><DD><CODE>dst</CODE> - the object to copy from<DD><CODE>src</CODE> - the object to copy into, which is destroyed
364<DT><B>Throws:</B>
365<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>
366</DD>
367</DL>
368<HR>
369
370<A NAME="cloneWritableInto(org.apache.hadoop.io.Writable, org.apache.hadoop.io.Writable)"><!-- --></A><H3>
371cloneWritableInto</H3>
372<PRE>
373<FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A>
374</FONT>public static void <B>cloneWritableInto</B>(<A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;dst,
375                                                <A HREF="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>&nbsp;src)
376                              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>
377<DL>
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381
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