1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <!--NewPage--> 3 <HTML> 4 <HEAD> 5 <!-- Generated by javadoc (build 1.6.0-google-internal) on Mon Jan 04 20:47:59 PST 2010 --> 6 <TITLE> 7 FileBackedOutputStream (Guava Libraries 2010.01.04) 8 </TITLE> 9 10 <META NAME="date" CONTENT="2010-01-04"> 11 12 <LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"> 13 14 <SCRIPT type="text/javascript"> 15 function windowTitle() 16 { 17 if (location.href.indexOf('is-external=true') == -1) { 18 parent.document.title="FileBackedOutputStream (Guava Libraries 2010.01.04)"; 19 } 20 } 21 </SCRIPT> 22 <NOSCRIPT> 23 </NOSCRIPT> 24 25 </HEAD> 26 27 <BODY BGCOLOR="white" onload="windowTitle();"> 28 <HR> 29 30 31 <!-- ========= START OF TOP NAVBAR ======= --> 32 <A NAME="navbar_top"><!-- --></A> 33 <A HREF="#skip-navbar_top" title="Skip navigation links"></A> 34 <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" 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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/OutputStream.html?is-external=true" title="class or interface in java.io">java.io.OutputStream</A> 97 <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.io.FileBackedOutputStream</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="http://java.sun.com/javase/6/docs/api/java/io/Flushable.html?is-external=true" title="class or interface in java.io">Flushable</A></DD> 101 </DL> 102 <HR> 103 <DL> 104 <DT><PRE>public final class <B>FileBackedOutputStream</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</A></DL> 105 </PRE> 106 107 <P> 108 An <A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io"><CODE>OutputStream</CODE></A> that starts buffering to a byte array, but 109 switches to file buffering once the data reaches a configurable size. 110 111 <p>This class is thread-safe. 112 <P> 113 114 <P> 115 <DL> 116 <DT><B>Since:</B></DT> 117 <DD>2009.09.15 <b>tentative</b></DD> 118 <DT><B>Author:</B></DT> 119 <DD>Chris Nokleberg</DD> 120 </DL> 121 <HR> 122 123 <P> 124 125 <!-- ======== CONSTRUCTOR SUMMARY ======== --> 126 127 <A NAME="constructor_summary"><!-- --></A> 128 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 129 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 130 <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> 131 <B>Constructor Summary</B></FONT></TH> 132 </TR> 133 <TR BGCOLOR="white" CLASS="TableRowColor"> 134 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#FileBackedOutputStream(int)">FileBackedOutputStream</A></B>(int fileThreshold)</CODE> 135 136 <BR> 137 Creates a new instance that uses the given file threshold.</TD> 138 </TR> 139 <TR BGCOLOR="white" CLASS="TableRowColor"> 140 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#FileBackedOutputStream(int, boolean)">FileBackedOutputStream</A></B>(int fileThreshold, 141 boolean resetOnFinalize)</CODE> 142 143 <BR> 144 Creates a new instance that uses the given file threshold, and 145 optionally resets the data when the <A HREF="../../../../com/google/common/io/InputSupplier.html" title="interface in com.google.common.io"><CODE>InputSupplier</CODE></A> returned 146 by <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#getSupplier()"><CODE>getSupplier()</CODE></A> is finalized.</TD> 147 </TR> 148 </TABLE> 149 150 <!-- ========== METHOD SUMMARY =========== --> 151 152 <A NAME="method_summary"><!-- --></A> 153 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 154 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 155 <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> 156 <B>Method Summary</B></FONT></TH> 157 </TR> 158 <TR BGCOLOR="white" CLASS="TableRowColor"> 159 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 160 <CODE> void</CODE></FONT></TD> 161 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#close()">close</A></B>()</CODE> 162 163 <BR> 164 </TD> 165 </TR> 166 <TR BGCOLOR="white" CLASS="TableRowColor"> 167 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 168 <CODE> void</CODE></FONT></TD> 169 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#flush()">flush</A></B>()</CODE> 170 171 <BR> 172 </TD> 173 </TR> 174 <TR BGCOLOR="white" CLASS="TableRowColor"> 175 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 176 <CODE> <A HREF="../../../../com/google/common/io/InputSupplier.html" title="interface in com.google.common.io">InputSupplier</A><<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>></CODE></FONT></TD> 177 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#getSupplier()">getSupplier</A></B>()</CODE> 178 179 <BR> 180 Returns a supplier that may be used to retrieve the data buffered 181 by this stream.</TD> 182 </TR> 183 <TR BGCOLOR="white" CLASS="TableRowColor"> 184 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 185 <CODE> void</CODE></FONT></TD> 186 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#reset()">reset</A></B>()</CODE> 187 188 <BR> 189 Calls <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#close()"><CODE>close()</CODE></A> if not already closed, and then resets this 190 object back to its initial state, for reuse.</TD> 191 </TR> 192 <TR BGCOLOR="white" CLASS="TableRowColor"> 193 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 194 <CODE> void</CODE></FONT></TD> 195 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#write(byte[])">write</A></B>(byte[] b)</CODE> 196 197 <BR> 198 </TD> 199 </TR> 200 <TR BGCOLOR="white" CLASS="TableRowColor"> 201 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 202 <CODE> void</CODE></FONT></TD> 203 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#write(byte[], int, int)">write</A></B>(byte[] b, 204 int off, 205 int len)</CODE> 206 207 <BR> 208 </TD> 209 </TR> 210 <TR BGCOLOR="white" CLASS="TableRowColor"> 211 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 212 <CODE> void</CODE></FONT></TD> 213 <TD><CODE><B><A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#write(int)">write</A></B>(int b)</CODE> 214 215 <BR> 216 </TD> 217 </TR> 218 </TABLE> 219 <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></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.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> 223 </TR> 224 <TR BGCOLOR="white" CLASS="TableRowColor"> 225 <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> 226 </TR> 227 </TABLE> 228 229 <P> 230 231 <!-- ========= CONSTRUCTOR DETAIL ======== --> 232 233 <A NAME="constructor_detail"><!-- --></A> 234 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 235 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 236 <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> 237 <B>Constructor Detail</B></FONT></TH> 238 </TR> 239 </TABLE> 240 241 <A NAME="FileBackedOutputStream(int)"><!-- --></A><H3> 242 FileBackedOutputStream</H3> 243 <PRE> 244 public <B>FileBackedOutputStream</B>(int fileThreshold)</PRE> 245 <DL> 246 <DD>Creates a new instance that uses the given file threshold. 247 Equivalent to <code>ThresholdOutputStream(fileThreshold, false)</code>. 248 <P> 249 <DL> 250 <DT><B>Parameters:</B><DD><CODE>fileThreshold</CODE> - the number of bytes before the stream should 251 switch to buffering to a file</DL> 252 </DL> 253 <HR> 254 255 <A NAME="FileBackedOutputStream(int, boolean)"><!-- --></A><H3> 256 FileBackedOutputStream</H3> 257 <PRE> 258 public <B>FileBackedOutputStream</B>(int fileThreshold, 259 boolean resetOnFinalize)</PRE> 260 <DL> 261 <DD>Creates a new instance that uses the given file threshold, and 262 optionally resets the data when the <A HREF="../../../../com/google/common/io/InputSupplier.html" title="interface in com.google.common.io"><CODE>InputSupplier</CODE></A> returned 263 by <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#getSupplier()"><CODE>getSupplier()</CODE></A> is finalized. 264 <P> 265 <DL> 266 <DT><B>Parameters:</B><DD><CODE>fileThreshold</CODE> - the number of bytes before the stream should 267 switch to buffering to a file<DD><CODE>resetOnFinalize</CODE> - if true, the <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#reset()"><CODE>reset()</CODE></A> method will 268 be called when the <A HREF="../../../../com/google/common/io/InputSupplier.html" title="interface in com.google.common.io"><CODE>InputSupplier</CODE></A> returned by <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#getSupplier()"><CODE>getSupplier()</CODE></A> 269 is finalized</DL> 270 </DL> 271 272 <!-- ============ METHOD DETAIL ========== --> 273 274 <A NAME="method_detail"><!-- --></A> 275 <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 276 <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 277 <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> 278 <B>Method Detail</B></FONT></TH> 279 </TR> 280 </TABLE> 281 282 <A NAME="getSupplier()"><!-- --></A><H3> 283 getSupplier</H3> 284 <PRE> 285 public <A HREF="../../../../com/google/common/io/InputSupplier.html" title="interface in com.google.common.io">InputSupplier</A><<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>getSupplier</B>()</PRE> 286 <DL> 287 <DD>Returns a supplier that may be used to retrieve the data buffered 288 by this stream. 289 <P> 290 <DD><DL> 291 </DL> 292 </DD> 293 </DL> 294 <HR> 295 296 <A NAME="reset()"><!-- --></A><H3> 297 reset</H3> 298 <PRE> 299 public void <B>reset</B>() 300 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> 301 <DL> 302 <DD>Calls <A HREF="../../../../com/google/common/io/FileBackedOutputStream.html#close()"><CODE>close()</CODE></A> if not already closed, and then resets this 303 object back to its initial state, for reuse. If data was buffered 304 to a file, it will be deleted. 305 <P> 306 <DD><DL> 307 308 <DT><B>Throws:</B> 309 <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 an I/O error occurred while deleting the file buffer</DL> 310 </DD> 311 </DL> 312 <HR> 313 314 <A NAME="write(int)"><!-- --></A><H3> 315 write</H3> 316 <PRE> 317 public void <B>write</B>(int b) 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><DL> 321 <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true#write(int)" title="class or interface in java.io">write</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</A></CODE></DL> 322 </DD> 323 <DD><DL> 324 325 <DT><B>Throws:</B> 326 <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> 327 </DD> 328 </DL> 329 <HR> 330 331 <A NAME="write(byte[])"><!-- --></A><H3> 332 write</H3> 333 <PRE> 334 public void <B>write</B>(byte[] b) 335 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> 336 <DL> 337 <DD><DL> 338 <DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true#write(byte[])" title="class or interface in java.io">write</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</A></CODE></DL> 339 </DD> 340 <DD><DL> 341 342 <DT><B>Throws:</B> 343 <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> 344 </DD> 345 </DL> 346 <HR> 347 348 <A NAME="write(byte[], int, int)"><!-- --></A><H3> 349 write</H3> 350 <PRE> 351 public void <B>write</B>(byte[] b, 352 int off, 353 int len) 354 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> 355 <DL> 356 <DD><DL> 357 <DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true#write(byte[], int, int)" title="class or interface in java.io">write</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</A></CODE></DL> 358 </DD> 359 <DD><DL> 360 361 <DT><B>Throws:</B> 362 <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> 363 </DD> 364 </DL> 365 <HR> 366 367 <A NAME="close()"><!-- --></A><H3> 368 close</H3> 369 <PRE> 370 public void <B>close</B>() 371 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> 372 <DL> 373 <DD><DL> 374 <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in interface <CODE><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></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true#close()" title="class or interface in java.io">close</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</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> 380 </DD> 381 </DL> 382 <HR> 383 384 <A NAME="flush()"><!-- --></A><H3> 385 flush</H3> 386 <PRE> 387 public void <B>flush</B>() 388 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> 389 <DL> 390 <DD><DL> 391 <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Flushable.html?is-external=true#flush()" title="class or interface in java.io">flush</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/Flushable.html?is-external=true" title="class or interface in java.io">Flushable</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true#flush()" title="class or interface in java.io">flush</A></CODE> in class <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io">OutputStream</A></CODE></DL> 392 </DD> 393 <DD><DL> 394 395 <DT><B>Throws:</B> 396 <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> 397 </DD> 398 </DL> 399 <!-- ========= END OF CLASS DATA ========= --> 400 <HR> 401 402 403 <!-- ======= START OF BOTTOM NAVBAR ====== --> 404 <A NAME="navbar_bottom"><!-- --></A> 405 <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> 406 <TABLE BORDER="0" 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