thatīs an awesome solution Ales!<div>I didnīt thought that I could obtain the parametizedType that way!</div><div>Testing this will be my first task tomorrow morning.<br><br>thank you all for your ideas.<br><br><div class="gmail_quote">
On Tue, Dec 6, 2011 at 8:55 PM, Jason Porter <span dir="ltr">&lt;<a href="mailto:lightguard.jp@gmail.com">lightguard.jp@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Nice solution Ales, wish I&#39;d thought of it :)<div class="HOEnZb"><div class="h5"><br><br><div class="gmail_quote">On Tue, Dec 6, 2011 at 15:45, Ales Justin <span dir="ltr">&lt;<a href="mailto:ales.justin@gmail.com" target="_blank">ales.justin@gmail.com</a>&gt;</span> wrote:<br>


<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>You could do something like this:</div><div><br></div><div><div>    @SuppressWarnings({&quot;unchecked&quot;})</div>


<div>    @Produces</div><div>    public GenericQuery injectClass(InjectionPoint ip) {</div><div>        Annotated annotated = ip.getAnnotated();</div><div>        Class clazz = Object.class;</div><div>        Type type = annotated.getBaseType();</div>


<div>        if (type instanceof ParameterizedType) {</div><div>            ParameterizedType pt = (ParameterizedType) type;</div><div>            clazz = (Class) pt.getActualTypeArguments()[0];</div><div>        }</div>

<div>
        return new GenericQuery(clazz);</div><div>    }</div><div><br></div><div>--</div><div><br></div><div><div>    @Inject</div><div>    GenericQuery&lt;String&gt; gqs;</div><div>    @Inject</div><div>    GenericQuery&lt;Number&gt; gqn;</div>


</div><div><br></div><div>--</div><div><br></div><div><div><div>        System.out.println(&quot;GQS: &quot; + gqs.getClazz());</div><div>        System.out.println(&quot;GQN: &quot; + gqn.getClazz());</div></div></div><span><font color="#888888"><div>


<br></div><div>--</div><div><br></div><div><div>GQS: class java.lang.String</div><div>GQN: class java.lang.Number</div></div><div><br></div><div>--</div><div><br></div><div><a href="https://github.com/alesj/cdi-arq-workshop/commit/64860f15197be40a7714dfd8a7da931c1db11411" target="_blank">https://github.com/alesj/cdi-arq-workshop/commit/64860f15197be40a7714dfd8a7da931c1db11411</a></div>


<div><br></div><div>HTH</div><div><br></div><div>-Ales</div></font></span></div><div><br><blockquote type="cite"><div><div>Hey guys, how you doing?<div><br></div><div><div>I&#39;m trying to achieve something that might be impossible, but before concluding that, I&#39;d like to ask you, CDI gurus!</div>


<div><br></div><div>I have the following class:</div>
<div><br></div><div>public class Foo&lt;T&gt; {</div><div><br></div><div>    public TypedQuery&lt;T&gt; getQuery(){</div><div><br></div><div>    }</div><div><br></div><div>}</div><div><br></div><div>As you can Imagine, inside my getQuery method, I&#39;d have to use &quot;T.class&quot; to make it TypedQuery. which is impossible due java generics type erasure.</div>



<div><br></div><div>so I&#39;d have to build a private field to hold the t.class for me.</div><div><br></div><div><div>public class Foo&lt;T&gt; {</div><div><br></div><div>    private Class&lt;T&gt; klass;</div><div><br>


</div>
<div>    public TypedQuery&lt;T&gt; getQuery(){</div><div><br></div><div>    }</div><div>    </div><div>    public void setKlass(Class&lt;T&gt; klass){</div><div>        this.klass = klass;</div><div>    }</div><div>}</div>



</div><div><br></div><div>The problem is that forcing this &#39;setKlass&#39; feels very ugly to the api, and it&#39;s not very error prone, since one could easily forget to set this configuration.</div><div><br></div><div>



So I had an Idea: force the setKlass inside the constructor:</div><div><br></div><div><div>public class Foo&lt;T&gt; {</div><div><br></div><div>    private Class&lt;T&gt; klass;</div><div>    </div><div>    public Foo(Class&lt;T&gt; klass){</div>



<div>        this.klass = klass;</div><div>    }</div><div><br></div><div>    public TypedQuery&lt;T&gt; getQuery(){</div><div><br></div><div>    }</div><div><br></div><div>}</div></div><div><br></div><div>Unfortunatelly, this breaks cdi, since it cannot inject it anymore. At least AFAIK.</div>



<div><br></div><div>So, is there a way out of this? maybe using a secret solder feature?</div></div></div></div><div>
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<br></blockquote></div><br><br clear="all"><div><br></div></div></div><div class="HOEnZb"><div class="h5">-- <br>Jason Porter<br><a href="http://lightguard-jp.blogspot.com" target="_blank">http://lightguard-jp.blogspot.com</a><br>
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<br>Software Engineer<br>Open Source Advocate<br>Author of Seam Catch - Next Generation Java Exception Handling<br><br>PGP key id: 926CCFF5<br>PGP key available at: <a href="http://keyserver.net" target="_blank">keyserver.net</a>, <a href="http://pgp.mit.edu" target="_blank">pgp.mit.edu</a><br>



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