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<font face="Arial"><a class="show" id="design_toggle" title="Show or hide design notes" href="../../index.html"><img src="../../Images/Icons/G.png" width="14" height="14" border="0" align="middle"/></a> Genetic Programming Engine FAQ</font></td>
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<font face="Arial">Verifying the Environment</font></h1>
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<p><font face="Arial">The EnvironmentVerifier verifies that the collection of EnvironmentReferences passed to its constructor
each have the appropriate characteristics and implement all required members for an
<b>IEnvironment</b> class used by the <b>GPEngine</b>. It initializes a new instance of the EnvironmentVerifier class with the specified
EnvironmentReferences and determines if there is an invalid element.<p></div>
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<font SIZE="2" face="Courier New">public</font><font SIZE="2"><font face="Courier New">
EnvironmentVerifier( EnvironmentReference[] environments ) {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">//do basic checks</p>
</font><font SIZE="2">
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">if( environments ==
null</font><font SIZE="2"><font face="Courier New"> ) {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">throw new</font><font face="Courier New" SIZE="2">
ArgumentNullException( "environments", "The array of environment</font></p>
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<font face="Courier New" SIZE="2">
</font><font SIZE="2"><font face="Courier New"> references passed
to EnvironmentVerifier.constructor was null." );</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
}</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">if</font><font SIZE="2"><font face="Courier New">(
environments.Length == 0 ) {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">throw new</font><font face="Courier New" SIZE="2">
ArgumentException( "The array of environment references passed to</font></p>
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<font face="Courier New" SIZE="2">
</font><font SIZE="2"><font face="Courier New"> EnvironmentVerifier.constructor
was empty.", "environments" );</font></p>
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}</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">//instantiate each
reference</p>
</font><font SIZE="2">
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
EnvironmentCollection envs = </font></font>
<font SIZE="2" face="Courier New">null</font><font SIZE="2"><font face="Courier New">;</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">try</font><font SIZE="2"><font face="Courier New">
{</font></p>
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envs = Tester.CreateEnvironments( environments );</font></p>
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}</font></p>
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</font></font><font SIZE="2" face="Courier New">catch</font><font SIZE="2"><font face="Courier New">(
ArgumentException e ) {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">throw new</font><font face="Courier New" SIZE="2">
ArgumentException( "The array of environment references passed to</font></p>
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<font face="Courier New" SIZE="2">
</font><font face="Courier New" SIZE="2"> EnvironmentVerifier.constructor
had at least one invalid element.",</font></p>
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<font face="Courier New" SIZE="2">
</font><font SIZE="2"><font face="Courier New"> "environments", e
);</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
}</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">//everything checks
out</p>
</font><font SIZE="2">
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
m_Environments = </font></font><font SIZE="2" face="Courier New">new</font><font SIZE="2"><font face="Courier New">
ReadOnlyEnvironmentReferenceCollection( environments );</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
m_InstantiatedEnvironments = </font></font>
<font SIZE="2" face="Courier New">new</font><font SIZE="2"><font face="Courier New">
ReadOnlyEnvironmentCollection( envs );</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">}</font></font></td>
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<p class="dtH4" align="left"><font face="Arial">The Environments method gets the verified collection of EnvironmentReferences.</font></p>
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<font SIZE="2" face="Courier New">public</font><font SIZE="2"><font face="Courier New">
ReadOnlyEnvironmentReferenceCollection Environments {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">get</font><font SIZE="2"><font face="Courier New">
{</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">return</font><font SIZE="2"><font face="Courier New">
m_Environments;</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
}</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">}</font></p>
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<font SIZE="2" face="Courier New">private</font><font SIZE="2"><font face="Courier New">
ReadOnlyEnvironmentReferenceCollection m_Environments;</font></font></td>
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<p class="dtH4" align="left">The InstantiatedEnvironments method gets the collection of instantiated IEnvironments referenced by Environments.
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<font SIZE="2" face="Courier New">public</font><font SIZE="2"><font face="Courier New">
ReadOnlyEnvironmentCollection InstantiatedEnvironments {</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">get</font><font SIZE="2"><font face="Courier New">
{</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
</font></font><font SIZE="2" face="Courier New">return</font><font SIZE="2"><font face="Courier New">
m_InstantiatedEnvironments;</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">
}</font></p>
<p style="margin-top: 0; margin-bottom: 0"><font face="Courier New">}</font></p>
<p style="margin-top: 0; margin-bottom: 0"></font>
<font SIZE="2" face="Courier New">private</font><font face="Courier New" SIZE="2">
ReadOnlyEnvironmentCollection m_InstantiatedEnvironments;</font></td>
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<p class="dtH4"> </p>
<h4 class="dtH4"><font face="Arial">See Also</font></h4>
<p>
<a href="../GPE.htm">GPEngine</a> | <a href="../ProblemSpace/Environment.htm">
IEnvironment</a></p>
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