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Scope (Guice 1.0 API)
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com.google.inject</FONT>
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Interface Scope</H2>
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<DT><PRE>public interface <B>Scope</B></DL>
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<P>
A scope is a level of visibility that instances provided by Guice may have.
By default, an instance created by the <A HREF="../../../com/google/inject/Injector.html" title="interface in com.google.inject"><CODE>Injector</CODE></A> has <i>no scope</i>,
meaning it has no state from the framework's perspective -- the
<code>Injector</code> creates it, injects it once into the class that required it,
and then immediately forgets it. Associating a scope with a particular
binding allows the created instance to be "remembered" and possibly used
again for other injections.
<p>An example of a scope is <A HREF="../../../com/google/inject/Scopes.html#SINGLETON"><CODE>Scopes.SINGLETON</CODE></A>.
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<TD><CODE><B><A HREF="../../../com/google/inject/Scope.html#scope(com.google.inject.Key, com.google.inject.Provider)">scope</A></B>(<A HREF="../../../com/google/inject/Key.html" title="class in com.google.inject">Key</A><T> key,
<A HREF="../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A><T> unscoped)</CODE>
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Scopes a provider.</TD>
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<CODE> <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/inject/Scope.html#toString()">toString</A></B>()</CODE>
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A short but useful description of this scope.</TD>
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<A NAME="scope(com.google.inject.Key, com.google.inject.Provider)"><!-- --></A><H3>
scope</H3>
<PRE>
<T> <A HREF="../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A><T> <B>scope</B>(<A HREF="../../../com/google/inject/Key.html" title="class in com.google.inject">Key</A><T> key,
<A HREF="../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A><T> unscoped)</PRE>
<DL>
<DD>Scopes a provider. The returned provider returns objects from this scope.
If an object does not exist in this scope, the provider can use the given
unscoped provider to retrieve one.
<p>Scope implementations are strongly encouraged to override
<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"><CODE>Object.toString()</CODE></A> in the returned provider and include the backing
provider's <code>toString()</code> output.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - binding key<DD><CODE>unscoped</CODE> - locates an instance when one doesn't already exist in this
scope.
<DT><B>Returns:</B><DD>a new provider which only delegates to the given unscoped provider
when an instance of the requested object doesn't already exist in this
scope</DL>
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<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
<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>toString</B>()</PRE>
<DL>
<DD>A short but useful description of this scope. For comparison, the standard
scopes that ship with guice use the descriptions
<code>"Scopes.SINGLETON"</code>, <code>"ServletScopes.SESSION"</code> and
<code>"ServletScopes.REQUEST"</code>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><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></CODE> in class <CODE><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></CODE></DL>
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