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<h2 title="Interface ServiceSelector" class="title">Interface ServiceSelector</h2>
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<pre>public interface <span class="strong">ServiceSelector</span></pre>
<div class="block">A <code>ServiceSelector</code> selects <code>Object</code>s based on a
supplied policy. The contract is that all the <code>Object</code>s implement the
same role.</div>
<dl><dt><span class="strong">Version:</span></dt>
<dd>CVS $Revision: 1.16 $ $Date: 2004/02/11 14:34:25 $</dd>
<dt><span class="strong">Author:</span></dt>
<dd><a href="mailto:dev@avalon.apache.org">Avalon Development Team</a></dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/avalon/framework/service/Serviceable.html" title="interface in org.apache.avalon.framework.service"><code>Serviceable</code></a>,
<a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html" title="interface in org.apache.avalon.framework.service"><code>ServiceSelector</code></a></dd></dl>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html#isSelectable(java.lang.Object)">isSelectable</a></strong>(java.lang.Object policy)</code>
<div class="block">Check to see if a <code>Object</code> exists relative to the supplied policy.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html#release(java.lang.Object)">release</a></strong>(java.lang.Object object)</code>
<div class="block">Return the <code>Object</code> when you are finished with it.</div>
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<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html#select(java.lang.Object)">select</a></strong>(java.lang.Object policy)</code>
<div class="block">Select the <code>Object</code> associated with the given policy.</div>
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<h4>select</h4>
<pre>java.lang.Object select(java.lang.Object policy)
throws <a href="../../../../../org/apache/avalon/framework/service/ServiceException.html" title="class in org.apache.avalon.framework.service">ServiceException</a></pre>
<div class="block">Select the <code>Object</code> associated with the given policy.
For instance, If the <a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html" title="interface in org.apache.avalon.framework.service"><code>ServiceSelector</code></a> has a
<code>Generator</code> stored and referenced by a URL, the
following call could be used:
<pre>
try
{
Generator input;
input = (Generator)selector.select( new URL("foo://demo/url") );
}
catch (...)
{
...
}
</pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>policy</code> - A criteria against which a <code>Object</code> is selected.</dd>
<dt><span class="strong">Returns:</span></dt><dd>an <code>Object</code> value</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/avalon/framework/service/ServiceException.html" title="class in org.apache.avalon.framework.service">ServiceException</a></code> - If the requested <code>Object</code> cannot be supplied</dd></dl>
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<h4>isSelectable</h4>
<pre>boolean isSelectable(java.lang.Object policy)</pre>
<div class="block">Check to see if a <code>Object</code> exists relative to the supplied policy.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>policy</code> - a <code>Object</code> containing the selection criteria</dd>
<dt><span class="strong">Returns:</span></dt><dd>True if the component is available, False if it not.</dd></dl>
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<h4>release</h4>
<pre>void release(java.lang.Object object)</pre>
<div class="block">Return the <code>Object</code> when you are finished with it. This
allows the <a href="../../../../../org/apache/avalon/framework/service/ServiceSelector.html" title="interface in org.apache.avalon.framework.service"><code>ServiceSelector</code></a> to handle the End-Of-Life Lifecycle
events associated with the <code>Object</code>. Please note, that no
Exception should be thrown at this point. This is to allow easy use of the
ServiceSelector system without having to trap Exceptions on a release.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>object</code> - The <code>Object</code> we are releasing, may also be a
<code>null</code> reference</dd></dl>
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