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 20:47:56 PST 2010 --> 6<TITLE> 7Functions (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"> 15function windowTitle() 16{ 17 if (location.href.indexOf('is-external=true') == -1) { 18 parent.document.title="Functions (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" CELLSPACING="0" SUMMARY=""> 35<TR> 36<TD COLSPAN=2 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document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); 67 } 68 //--> 69</SCRIPT> 70<NOSCRIPT> 71 <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A> 72</NOSCRIPT> 73 74 75</FONT></TD> 76</TR> 77<TR> 78<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> 79 SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD> 80<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> 81DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD> 82</TR> 83</TABLE> 84<A NAME="skip-navbar_top"></A> 85<!-- ========= END OF TOP NAVBAR ========= --> 86 87<HR> 88<!-- ======== START OF CLASS DATA ======== --> 89<H2> 90<FONT SIZE="-1"> 91com.google.common.base</FONT> 92<BR> 93Class Functions</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>com.google.common.base.Functions</B> 97</PRE> 98<HR> 99<DL> 100<DT><PRE>public final class <B>Functions</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> 104Useful functions. 105 106 <p>All methods returns serializable functions as long as they're given 107 serializable parameters. 108<P> 109 110<P> 111<DL> 112<DT><B>Since:</B></DT> 113 <DD>2010.01.04 <b>stable</b> (imported from Google Collections Library)</DD> 114<DT><B>Author:</B></DT> 115 <DD>Mike Bostock, Vlad Patryshev, Jared Levy</DD> 116</DL> 117<HR> 118 119<P> 120 121<!-- ========== METHOD SUMMARY =========== --> 122 123<A NAME="method_summary"><!-- --></A> 124<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 125<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 126<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> 127<B>Method Summary</B></FONT></TH> 128</TR> 129<TR BGCOLOR="white" CLASS="TableRowColor"> 130<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 131<CODE>static 132<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""> 133<TR ALIGN="right" VALIGN=""> 134<TD NOWRAP><FONT SIZE="-1"> 135<CODE><A,B,C> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,C></CODE></FONT></TD> 136</TR> 137</TABLE> 138</CODE></FONT></TD> 139<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#compose(com.google.common.base.Function, com.google.common.base.Function)">compose</A></B>(<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><B,C> g, 140 <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,? extends B> f)</CODE> 141 142<BR> 143 Returns the composition of two functions.</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><E> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><<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>,E></CODE></FONT></TD> 152</TR> 153</TABLE> 154</CODE></FONT></TD> 155<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#constant(E)">constant</A></B>(E value)</CODE> 156 157<BR> 158 Creates a function that returns <code>value</code> for any input.</TD> 159</TR> 160<TR BGCOLOR="white" CLASS="TableRowColor"> 161<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 162<CODE>static 163<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""> 164<TR ALIGN="right" VALIGN=""> 165<TD NOWRAP><FONT SIZE="-1"> 166<CODE><K,V> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><K,V></CODE></FONT></TD> 167</TR> 168</TABLE> 169</CODE></FONT></TD> 170<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#forMap(java.util.Map, V)">forMap</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><K,? extends V> map, 171 V defaultValue)</CODE> 172 173<BR> 174 Returns a function which performs a map lookup with a default value.</TD> 175</TR> 176<TR BGCOLOR="white" CLASS="TableRowColor"> 177<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 178<CODE>static 179<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""> 180<TR ALIGN="right" VALIGN=""> 181<TD NOWRAP><FONT SIZE="-1"> 182<CODE><K,V> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><K,V></CODE></FONT></TD> 183</TR> 184</TABLE> 185</CODE></FONT></TD> 186<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#forMap(java.util.Map)">forMap</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><K,V> map)</CODE> 187 188<BR> 189 Returns a function which performs a map lookup.</TD> 190</TR> 191<TR BGCOLOR="white" CLASS="TableRowColor"> 192<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 193<CODE>static 194<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""> 195<TR ALIGN="right" VALIGN=""> 196<TD NOWRAP><FONT SIZE="-1"> 197<CODE><T> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><T,<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>></CODE></FONT></TD> 198</TR> 199</TABLE> 200</CODE></FONT></TD> 201<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#forPredicate(com.google.common.base.Predicate)">forPredicate</A></B>(<A HREF="../../../../com/google/common/base/Predicate.html" title="interface in com.google.common.base">Predicate</A><T> predicate)</CODE> 202 203<BR> 204 Creates a function that returns the same boolean output as the given 205 predicate for all inputs.</TD> 206</TR> 207<TR BGCOLOR="white" CLASS="TableRowColor"> 208<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 209<CODE>static 210<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY=""> 211<TR ALIGN="right" VALIGN=""> 212<TD NOWRAP><FONT SIZE="-1"> 213<CODE><E> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><E,E></CODE></FONT></TD> 214</TR> 215</TABLE> 216</CODE></FONT></TD> 217<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#identity()">identity</A></B>()</CODE> 218 219<BR> 220 Returns the identity function.</TD> 221</TR> 222<TR BGCOLOR="white" CLASS="TableRowColor"> 223<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> 224<CODE>static <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><<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>,<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>></CODE></FONT></TD> 225<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#toStringFunction()">toStringFunction</A></B>()</CODE> 226 227<BR> 228 Returns a function that calls <code>toString()</code> on its argument.</TD> 229</TR> 230</TABLE> 231 <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> 232<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 233<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> 234<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> 235</TR> 236<TR BGCOLOR="white" CLASS="TableRowColor"> 237<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> 238</TR> 239</TABLE> 240 241<P> 242 243<!-- ============ METHOD DETAIL ========== --> 244 245<A NAME="method_detail"><!-- --></A> 246<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> 247<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> 248<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> 249<B>Method Detail</B></FONT></TH> 250</TR> 251</TABLE> 252 253<A NAME="toStringFunction()"><!-- --></A><H3> 254toStringFunction</H3> 255<PRE> 256public static <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><<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>,<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>> <B>toStringFunction</B>()</PRE> 257<DL> 258<DD>Returns a function that calls <code>toString()</code> on its argument. The 259 function does not accept nulls; it will throw a 260 <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang"><CODE>NullPointerException</CODE></A> when applied to <code>null</code>. 261<P> 262<DD><DL> 263</DL> 264</DD> 265</DL> 266<HR> 267 268<A NAME="identity()"><!-- --></A><H3> 269identity</H3> 270<PRE> 271public static <E> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><E,E> <B>identity</B>()</PRE> 272<DL> 273<DD>Returns the identity function. 274<P> 275<DD><DL> 276</DL> 277</DD> 278</DL> 279<HR> 280 281<A NAME="forMap(java.util.Map)"><!-- --></A><H3> 282forMap</H3> 283<PRE> 284public static <K,V> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><K,V> <B>forMap</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><K,V> map)</PRE> 285<DL> 286<DD>Returns a function which performs a map lookup. The returned function 287 throws an <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang"><CODE>IllegalArgumentException</CODE></A> if given a key that does not 288 exist in the map. 289<P> 290<DD><DL> 291</DL> 292</DD> 293</DL> 294<HR> 295 296<A NAME="forMap(java.util.Map,java.lang.Object)"><!-- --></A><A NAME="forMap(java.util.Map, V)"><!-- --></A><H3> 297forMap</H3> 298<PRE> 299public static <K,V> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><K,V> <B>forMap</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</A><K,? extends V> map, 300 <FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT> 301 V defaultValue)</PRE> 302<DL> 303<DD>Returns a function which performs a map lookup with a default value. The 304 function created by this method returns <code>defaultValue</code> for all 305 inputs that do not belong to the map's key set. 306<P> 307<DD><DL> 308<DT><B>Parameters:</B><DD><CODE>map</CODE> - source map that determines the function behavior<DD><CODE>defaultValue</CODE> - the value to return for inputs that aren't map keys 309<DT><B>Returns:</B><DD>function that returns <code>map.get(a)</code> when <code>a</code> is a key, 310 or <code>defaultValue</code> otherwise</DL> 311</DD> 312</DL> 313<HR> 314 315<A NAME="compose(com.google.common.base.Function, com.google.common.base.Function)"><!-- --></A><H3> 316compose</H3> 317<PRE> 318public static <A,B,C> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,C> <B>compose</B>(<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><B,C> g, 319 <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,? extends B> f)</PRE> 320<DL> 321<DD>Returns the composition of two functions. For <code>f: A->B</code> and 322 <code>g: B->C</code>, composition is defined as the function h such that 323 <code>h(a) == g(f(a))</code> for each <code>a</code>. 324<P> 325<DD><DL> 326<DT><B>Parameters:</B><DD><CODE>g</CODE> - the second function to apply<DD><CODE>f</CODE> - the first function to apply 327<DT><B>Returns:</B><DD>the composition of <code>f</code> and <code>g</code><DT><B>See Also:</B><DD><a href="//en.wikipedia.org/wiki/Function_composition"> 328 function composition</a></DL> 329</DD> 330</DL> 331<HR> 332 333<A NAME="forPredicate(com.google.common.base.Predicate)"><!-- --></A><H3> 334forPredicate</H3> 335<PRE> 336public static <T> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><T,<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</A>> <B>forPredicate</B>(<A HREF="../../../../com/google/common/base/Predicate.html" title="interface in com.google.common.base">Predicate</A><T> predicate)</PRE> 337<DL> 338<DD>Creates a function that returns the same boolean output as the given 339 predicate for all inputs. 340<P> 341<DD><DL> 342</DL> 343</DD> 344</DL> 345<HR> 346 347<A NAME="constant(java.lang.Object)"><!-- --></A><A NAME="constant(E)"><!-- --></A><H3> 348constant</H3> 349<PRE> 350public static <E> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><<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>,E> <B>constant</B>(<FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT> 351 E value)</PRE> 352<DL> 353<DD>Creates a function that returns <code>value</code> for any input. 354<P> 355<DD><DL> 356<DT><B>Parameters:</B><DD><CODE>value</CODE> - the constant value for the function to return 357<DT><B>Returns:</B><DD>a function that always returns <code>value</code></DL> 358</DD> 359</DL> 360<!-- ========= END OF CLASS DATA ========= --> 361<HR> 362 363 364<!-- ======= START OF BOTTOM NAVBAR ====== --> 365<A NAME="navbar_bottom"><!-- --></A> 366<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> 367<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> 368<TR> 369<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> 370<A NAME="navbar_bottom_firstrow"><!-- --></A> 371<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> 372 <TR ALIGN="center" VALIGN="top"> 373 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> 374 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> 375 <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> 376 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Functions.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> 377 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> 378 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> 379 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> 380 <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> 381 </TR> 382</TABLE> 383</TD> 384<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM> 385</EM> 386</TD> 387</TR> 388 389<TR> 390<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> 391 <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base"><B>PREV CLASS</B></A> 392 <A HREF="../../../../com/google/common/base/Joiner.html" title="class in com.google.common.base"><B>NEXT CLASS</B></A></FONT></TD> 393<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> 394 <A HREF="../../../../index.html?com/google/common/base/Functions.html" target="_top"><B>FRAMES</B></A> 395 <A HREF="Functions.html" target="_top"><B>NO FRAMES</B></A> 396 <SCRIPT type="text/javascript"> 397 <!-- 398 if(window==top) { 399 document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); 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