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FactoryProvider (Guice 2.0 API)
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com.google.inject.assistedinject</FONT>
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Class FactoryProvider&lt;F&gt;</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.inject.assistedinject.FactoryProvider&lt;F&gt;</B>
</PRE>
<DL>
<DT><DT><B>Type Parameters:</B><DD><CODE>F</CODE> - The factory interface</DL>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A>&lt;F&gt;, <A HREF="../../../../com/google/inject/spi/HasDependencies.html" title="interface in com.google.inject.spi">HasDependencies</A></DD>
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<DT><PRE>public class <B>FactoryProvider&lt;F&gt;</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><DT>implements <A HREF="../../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A>&lt;F&gt;, <A HREF="../../../../com/google/inject/spi/HasDependencies.html" title="interface in com.google.inject.spi">HasDependencies</A></DL>
</PRE>
<P>
Provides a factory that combines caller-provided parameters with injector-provided values when
constructing objects.
<h3>Defining a factory</h3>
Create an interface whose methods return the constructed type, or its supertypes. The method's
parameters are the arguments required to build the constructed type.
<pre>public interface PaymentFactory {
Payment create(Date startDate, Money amount);
}</pre>
You can name your factory methods whatever you like, such as <i>create</i>, <i>createPayment</i>
or <i>newPayment</i>.
<h3>Creating a type that accepts factory parameters</h3>
<code>constructedType</code> is a concrete class with an @<A HREF="../../../../com/google/inject/Inject.html" title="annotation in com.google.inject"><CODE>Inject</CODE></A>-annotated
constructor. In addition to injector-provided parameters, the constructor should have
parameters that match each of the factory method's parameters. Each factory-provided parameter
requires an @<A HREF="../../../../com/google/inject/assistedinject/Assisted.html" title="annotation in com.google.inject.assistedinject"><CODE>Assisted</CODE></A> annotation. This serves to document that the parameter
is not bound by your application's modules.
<pre>public class RealPayment implements Payment {
@Inject
public RealPayment(
CreditService creditService,
AuthService authService,
<strong>@Assisted Date startDate</strong>,
<strong>@Assisted Money amount</strong>) {
...
}
}</pre>
<h3>Configuring factories</h3>
In your <A HREF="../../../../com/google/inject/Module.html" title="interface in com.google.inject"><CODE>module</CODE></A>, bind the factory interface to the returned
factory:
<pre>bind(PaymentFactory.class).toProvider(
FactoryProvider.newFactory(PaymentFactory.class, RealPayment.class));</pre>
As a side-effect of this binding, Guice will inject the factory to initialize it for use. The
factory cannot be used until the injector has been initialized.
<h3>Using the factory</h3>
Inject your factory into your application classes. When you use the factory, your arguments
will be combined with values from the injector to produce a concrete instance.
<pre>public class PaymentAction {
@Inject private PaymentFactory paymentFactory;
public void doPayment(Money amount) {
Payment payment = paymentFactory.create(new Date(), amount);
payment.apply();
}
}</pre>
<h3>Making parameter types distinct</h3>
The types of the factory method's parameters must be distinct. To use multiple parameters of
the same type, use a named @<A HREF="../../../../com/google/inject/assistedinject/Assisted.html" title="annotation in com.google.inject.assistedinject"><CODE>Assisted</CODE></A> annotation to disambiguate the
parameters. The names must be applied to the factory method's parameters:
<pre>public interface PaymentFactory {
Payment create(
<strong>@Assisted("startDate")</strong> Date startDate,
<strong>@Assisted("dueDate")</strong> Date dueDate,
Money amount);
} </pre>
...and to the concrete type's constructor parameters:
<pre>public class RealPayment implements Payment {
@Inject
public RealPayment(
CreditService creditService,
AuthService authService,
<strong>@Assisted("startDate")</strong> Date startDate,
<strong>@Assisted("dueDate")</strong> Date dueDate,
<strong>@Assisted</strong> Money amount) {
...
}
}</pre>
<h3>Values are created by Guice</h3>
Returned factories use child injectors to create values. The values are eligible for method
interception. In addition, @Inject members will be injected before they are
returned.
<h3>Backwards compatibility using @AssistedInject</h3>
Instead of the @Inject annotation, you may annotate the constructed classes with
@<A HREF="../../../../com/google/inject/assistedinject/AssistedInject.html" title="annotation in com.google.inject.assistedinject"><CODE>AssistedInject</CODE></A>. This triggers a limited backwards-compatability mode.
<p>Instead of matching factory method arguments to constructor parameters using their names, the
<strong>parameters are matched by their order</strong>. The first factory method argument is
used for the first @Assisted constructor parameter, etc.. Annotation names have no
effect.
<p>Returned values are <strong>not created by Guice</strong>. These types are not eligible for
method interception. They do receive post-construction member injection.
<P>
<P>
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<CODE>&nbsp;<A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html" title="type parameter in FactoryProvider">F</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html#get()">get</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provides an instance of <code>T</code>.</TD>
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<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../com/google/inject/spi/Dependency.html" title="class in com.google.inject.spi">Dependency</A>&lt;?&gt;&gt;</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html#getDependencies()">getDependencies</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the known dependencies for this type.</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>&lt;F&gt; <A HREF="../../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A>&lt;F&gt;</CODE></FONT></TD>
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</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html#newFactory(java.lang.Class, java.lang.Class)">newFactory</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;F&gt;&nbsp;factoryType,
<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;?&gt;&nbsp;implementationType)</CODE>
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<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="newFactory(java.lang.Class, java.lang.Class)"><!-- --></A><H3>
newFactory</H3>
<PRE>
public static &lt;F&gt; <A HREF="../../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A>&lt;F&gt; <B>newFactory</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;F&gt;&nbsp;factoryType,
<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;?&gt;&nbsp;implementationType)</PRE>
<DL>
<DD><DL>
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</DD>
<DD><DL>
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<HR>
<A NAME="getDependencies()"><!-- --></A><H3>
getDependencies</H3>
<PRE>
public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</A>&lt;<A HREF="../../../../com/google/inject/spi/Dependency.html" title="class in com.google.inject.spi">Dependency</A>&lt;?&gt;&gt; <B>getDependencies</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../com/google/inject/spi/HasDependencies.html#getDependencies()">HasDependencies</A></CODE></B></DD>
<DD>Returns the known dependencies for this type. If this has dependencies whose values are not
known statically, a dependency for the <A HREF="../../../../com/google/inject/Injector.html" title="interface in com.google.inject"><CODE>Injector</CODE></A> will be
included in the returned set.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/google/inject/spi/HasDependencies.html#getDependencies()">getDependencies</A></CODE> in interface <CODE><A HREF="../../../../com/google/inject/spi/HasDependencies.html" title="interface in com.google.inject.spi">HasDependencies</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a possibly empty set</DL>
</DD>
</DL>
<HR>
<A NAME="get()"><!-- --></A><H3>
get</H3>
<PRE>
public <A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html" title="type parameter in FactoryProvider">F</A> <B>get</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../com/google/inject/Provider.html#get()">Provider</A></CODE></B></DD>
<DD>Provides an instance of <code>T</code>. Must never return <code>null</code>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../com/google/inject/Provider.html#get()">get</A></CODE> in interface <CODE><A HREF="../../../../com/google/inject/Provider.html" title="interface in com.google.inject">Provider</A>&lt;<A HREF="../../../../com/google/inject/assistedinject/FactoryProvider.html" title="type parameter in FactoryProvider">F</A>&gt;</CODE></DL>
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