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ReifiedType
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org.osgi.service.blueprint.container</FONT>
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Class ReifiedType</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.osgi.service.blueprint.container.ReifiedType</B>
</PRE>
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<DL>
<DT><PRE>public class <B>ReifiedType</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
Provides access to a concrete type and its optional generic type parameters.
<p>
Java 5 and later support generic types. These types consist of a raw class
with type parameters. This class models such a <code>Type</code> class but
ensures that the type is <em>reified</em>. Reification means that the Type
graph associated with a Java 5 <code>Type</code> instance is traversed until
the type becomes a concrete class. This class is available with the
<A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html#getRawClass()"><CODE>getRawClass()</CODE></A> method. The optional type parameters are recursively
represented as Reified Types.
<p>
In Java 1.4, a class has by definition no type parameters. This class
implementation provides the Reified Type for Java 1.4 by making the raw class
the Java 1.4 class and using a Reified Type based on the <code>Object</code>
class for any requested type parameter.
<p>
A Blueprint extender implementations can subclass this class and provide
access to the generic type parameter graph for conversion. Such a subclass
must <em>reify</em> the different Java 5 <code>Type</code> instances into the
reified form. That is, a form where the raw Class is available with its
optional type parameters as Reified Types.
<P>
<P>
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<TD><CODE><B><A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html#ReifiedType(java.lang.Class)">ReifiedType</A></B>(java.lang.Class<?> clazz)</CODE>
<BR>
Create a Reified Type for a raw Java class without any generic type
parameters.</TD>
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<CODE> <A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html" title="class in org.osgi.service.blueprint.container">ReifiedType</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html#getActualTypeArgument(int)">getActualTypeArgument</A></B>(int i)</CODE>
<BR>
Return a type parameter for this type.</TD>
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<CODE> java.lang.Class<?></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html#getRawClass()">getRawClass</A></B>()</CODE>
<BR>
Return the raw class represented by this type.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html#size()">size</A></B>()</CODE>
<BR>
Return the number of type parameters for this type.</TD>
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<A NAME="ReifiedType(java.lang.Class)"><!-- --></A><H3>
ReifiedType</H3>
<PRE>
public <B>ReifiedType</B>(java.lang.Class<?> clazz)</PRE>
<DL>
<DD>Create a Reified Type for a raw Java class without any generic type
parameters. Subclasses can provide the optional generic type parameter
information. Without subclassing, this instance has no type parameters.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>clazz</CODE> - The raw class of the Reified Type.</DL>
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<A NAME="getRawClass()"><!-- --></A><H3>
getRawClass</H3>
<PRE>
public java.lang.Class<?> <B>getRawClass</B>()</PRE>
<DL>
<DD>Return the raw class represented by this type.
The raw class represents the concrete class that is associated with a
type declaration. This class could have been deduced from the generics
type parameter graph of the declaration. For example, in the following
example:
<pre>
Map<String, ? extends Metadata>
</pre>
The raw class is the Map class.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The raw class represented by this type.</DL>
</DD>
</DL>
<HR>
<A NAME="getActualTypeArgument(int)"><!-- --></A><H3>
getActualTypeArgument</H3>
<PRE>
public <A HREF="../../../../../org/osgi/service/blueprint/container/ReifiedType.html" title="class in org.osgi.service.blueprint.container">ReifiedType</A> <B>getActualTypeArgument</B>(int i)</PRE>
<DL>
<DD>Return a type parameter for this type.
The type parameter refers to a parameter in a generic type declaration
given by the zero-based index <code>i</code>.
For example, in the following example:
<pre>
Map<String, ? extends Metadata>
</pre>
type parameter 0 is <code>String</code>, and type parameter 1 is
<code>Metadata</code>.
<p>
This implementation returns a Reified Type that has <code>Object</code>
as class. Any object is assignable to Object and therefore no conversion
is then necessary. This is compatible with versions of Java language
prior to Java 5.
This method should be overridden by a subclass that provides access to
the generic type parameter information for Java 5 and later.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - The zero-based index of the requested type parameter.
<DT><B>Returns:</B><DD>The <code>ReifiedType</code> for the generic type parameter at
the specified index.</DL>
</DD>
</DL>
<HR>
<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Return the number of type parameters for this type.
<p>
This implementation returns <code>0</code>. This method should be
overridden by a subclass that provides access to the generic type
parameter information for Java 5 and later.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>The number of type parameters for this type.</DL>
</DD>
</DL>
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