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Suppliers (Guava Libraries 2010.01.04)
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com.google.common.base</FONT>
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Class Suppliers</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.Suppliers</B>
</PRE>
<HR>
<DL>
<DT><PRE>public final class <B>Suppliers</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 suppliers.
<p>All methods return serializable suppliers 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>Laurence Gonsalves, Harry Heymann</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><F,T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Suppliers.html#compose(com.google.common.base.Function, com.google.common.base.Supplier)">compose</A></B>(<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><? super F,T> function,
<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><F> first)</CODE>
<BR>
Returns a new supplier which is the composition of the provided function
and supplier.</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="">
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<TD NOWRAP><FONT SIZE="-1">
<CODE><T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Suppliers.html#memoize(com.google.common.base.Supplier)">memoize</A></B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate)</CODE>
<BR>
Returns a supplier which caches the instance retrieved during the first
call to <code>get()</code> and returns that value on subsequent calls to
<code>get()</code>.</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><T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Suppliers.html#memoizeWithExpiration(com.google.common.base.Supplier, long, java.util.concurrent.TimeUnit)">memoizeWithExpiration</A></B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate,
long duration,
<A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</A> unit)</CODE>
<BR>
Returns a supplier that caches the instance supplied by the delegate and
removes the cached value after the specified time has passed.</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="">
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<TD NOWRAP><FONT SIZE="-1">
<CODE><T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Suppliers.html#ofInstance(T)">ofInstance</A></B>(T instance)</CODE>
<BR>
Returns a supplier that always supplies <code>instance</code>.</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="">
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<TD NOWRAP><FONT SIZE="-1">
<CODE><T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Suppliers.html#synchronizedSupplier(com.google.common.base.Supplier)">synchronizedSupplier</A></B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate)</CODE>
<BR>
Returns a supplier whose <code>get()</code> method synchronizes on
<code>delegate</code> before calling it, making it thread-safe.</TD>
</TR>
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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="compose(com.google.common.base.Function, com.google.common.base.Supplier)"><!-- --></A><H3>
compose</H3>
<PRE>
public static <F,T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> <B>compose</B>(<A HREF="../../../../com/google/common/base/Function.html" title="interface in com.google.common.base">Function</A><? super F,T> function,
<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><F> first)</PRE>
<DL>
<DD>Returns a new supplier which is the composition of the provided function
and supplier. In other words, the new supplier's value will be computed by
retrieving the value from <code>first</code>, and then applying
<code>function</code> to that value. Note that the resulting supplier will not
call <code>first</code> or invoke <code>function</code> until it is called.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="memoize(com.google.common.base.Supplier)"><!-- --></A><H3>
memoize</H3>
<PRE>
public static <T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> <B>memoize</B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate)</PRE>
<DL>
<DD>Returns a supplier which caches the instance retrieved during the first
call to <code>get()</code> and returns that value on subsequent calls to
<code>get()</code>. See:
<a href="http://en.wikipedia.org/wiki/Memoization">memoization</a>
<p>The returned supplier is thread-safe. The supplier's serialized form
does not contain the cached value, which will be recalculated when <code>get()</code> is called on the reserialized instance.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="memoizeWithExpiration(com.google.common.base.Supplier, long, java.util.concurrent.TimeUnit)"><!-- --></A><H3>
memoizeWithExpiration</H3>
<PRE>
public static <T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> <B>memoizeWithExpiration</B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate,
long duration,
<A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</A> unit)</PRE>
<DL>
<DD>Returns a supplier that caches the instance supplied by the delegate and
removes the cached value after the specified time has passed. Subsequent
calls to <code>get()</code> return the cached value if the expiration time has
not passed. After the expiration time, a new value is retrieved, cached,
and returned. See:
<a href="http://en.wikipedia.org/wiki/Memoization">memoization</a>
<p>The returned supplier is thread-safe. The supplier's serialized form
does not contain the cached value, which will be recalculated when <code>get()</code> is called on the reserialized instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>duration</CODE> - the length of time after a value is created that it
should stop being returned by subsequent <code>get()</code> calls<DD><CODE>unit</CODE> - the unit that <code>duration</code> is expressed in
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if <code>duration</code> is not positive<DT><B>Since:</B></DT>
<DD>2010.01.04 <b>tentative</b></DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="ofInstance(java.lang.Object)"><!-- --></A><A NAME="ofInstance(T)"><!-- --></A><H3>
ofInstance</H3>
<PRE>
public static <T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> <B>ofInstance</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>
T instance)</PRE>
<DL>
<DD>Returns a supplier that always supplies <code>instance</code>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="synchronizedSupplier(com.google.common.base.Supplier)"><!-- --></A><H3>
synchronizedSupplier</H3>
<PRE>
public static <T> <A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> <B>synchronizedSupplier</B>(<A HREF="../../../../com/google/common/base/Supplier.html" title="interface in com.google.common.base">Supplier</A><T> delegate)</PRE>
<DL>
<DD>Returns a supplier whose <code>get()</code> method synchronizes on
<code>delegate</code> before calling it, making it thread-safe.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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