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Functions (Guava Libraries 2010.01.04)
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com.google.common.base</FONT>
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Class Functions</H2>
<PRE>
<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>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.base.Functions</B>
</PRE>
<HR>
<DL>
<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>
</PRE>
<P>
Useful functions.
<p>All methods returns serializable functions as long as they're given
serializable parameters.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>2010.01.04 <b>stable</b> (imported from Google Collections Library)</DD>
<DT><B>Author:</B></DT>
<DD>Mike Bostock, Vlad Patryshev, Jared Levy</DD>
</DL>
<HR>
<P>
<!-- ========== METHOD SUMMARY =========== -->
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<B>Method Summary</B></FONT></TH>
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<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<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>
</TR>
</TABLE>
</CODE></FONT></TD>
<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,
<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,? extends B> f)</CODE>
<BR>
Returns the composition of two functions.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<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>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#constant(E)">constant</A></B>(E value)</CODE>
<BR>
Creates a function that returns <code>value</code> for any input.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<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>
</TR>
</TABLE>
</CODE></FONT></TD>
<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,
V defaultValue)</CODE>
<BR>
Returns a function which performs a map lookup with a default value.</TD>
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<CODE>static
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<TD NOWRAP><FONT SIZE="-1">
<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>
</TR>
</TABLE>
</CODE></FONT></TD>
<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>
<BR>
Returns a function which performs a map lookup.</TD>
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<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
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<TD NOWRAP><FONT SIZE="-1">
<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>
</TR>
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</CODE></FONT></TD>
<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>
<BR>
Creates a function that returns the same boolean output as the given
predicate for all inputs.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<CODE><E> <A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><E,E></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#identity()">identity</A></B>()</CODE>
<BR>
Returns the identity function.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<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>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Functions.html#toStringFunction()">toStringFunction</A></B>()</CODE>
<BR>
Returns a function that calls <code>toString()</code> on its argument.</TD>
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<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>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<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>
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<A NAME="toStringFunction()"><!-- --></A><H3>
toStringFunction</H3>
<PRE>
public 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>
<DL>
<DD>Returns a function that calls <code>toString()</code> on its argument. The
function does not accept nulls; it will throw a
<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>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="identity()"><!-- --></A><H3>
identity</H3>
<PRE>
public 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>
<DL>
<DD>Returns the identity function.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="forMap(java.util.Map)"><!-- --></A><H3>
forMap</H3>
<PRE>
public 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>
<DL>
<DD>Returns a function which performs a map lookup. The returned function
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
exist in the map.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="forMap(java.util.Map,java.lang.Object)"><!-- --></A><A NAME="forMap(java.util.Map, V)"><!-- --></A><H3>
forMap</H3>
<PRE>
public 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,
<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>
V defaultValue)</PRE>
<DL>
<DD>Returns a function which performs a map lookup with a default value. The
function created by this method returns <code>defaultValue</code> for all
inputs that do not belong to the map's key set.
<P>
<DD><DL>
<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
<DT><B>Returns:</B><DD>function that returns <code>map.get(a)</code> when <code>a</code> is a key,
or <code>defaultValue</code> otherwise</DL>
</DD>
</DL>
<HR>
<A NAME="compose(com.google.common.base.Function, com.google.common.base.Function)"><!-- --></A><H3>
compose</H3>
<PRE>
public 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,
<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><A,? extends B> f)</PRE>
<DL>
<DD>Returns the composition of two functions. For <code>f: A->B</code> and
<code>g: B->C</code>, composition is defined as the function h such that
<code>h(a) == g(f(a))</code> for each <code>a</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>g</CODE> - the second function to apply<DD><CODE>f</CODE> - the first function to apply
<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">
function composition</a></DL>
</DD>
</DL>
<HR>
<A NAME="forPredicate(com.google.common.base.Predicate)"><!-- --></A><H3>
forPredicate</H3>
<PRE>
public 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>
<DL>
<DD>Creates a function that returns the same boolean output as the given
predicate for all inputs.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="constant(java.lang.Object)"><!-- --></A><A NAME="constant(E)"><!-- --></A><H3>
constant</H3>
<PRE>
public 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>
E value)</PRE>
<DL>
<DD>Creates a function that returns <code>value</code> for any input.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the constant value for the function to return
<DT><B>Returns:</B><DD>a function that always returns <code>value</code></DL>
</DD>
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