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<ul class="subNavList">
<li>Summary: </li>
<li>Nested | </li>
<li><a href="#field_summary">Field</a> | </li>
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<div class="subTitle">org.apache.commons.discovery.tools</div>
<h2 title="Class DiscoverClass" class="title">Class DiscoverClass</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.commons.discovery.tools.DiscoverClass</li>
</ul>
</li>
</ul>
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<pre>public class <span class="strong">DiscoverClass</span>
extends java.lang.Object</pre>
<div class="block"><p>Discover class that implements a given service interface,
with discovery and configuration features similar to that employed
by standard Java APIs such as JAXP.
</p>
<p>In the context of this package, a service interface is defined by a
Service Provider Interface (SPI). The SPI is expressed as a Java interface,
abstract class, or (base) class that defines an expected programming
interface.
</p>
<p>DiscoverClass provides the <code>find</code> methods for locating a
class that implements a service interface (SPI). Each form of
<code>find</code> varies slightly, but they all perform the same basic
function.
The <code>DiscoverClass.find</code> methods proceed as follows:
</p>
<ul>
<p><li>
Get the name of an implementation class. The name is the first
non-null value obtained from the following resources:
<ul>
<li>
The value of the (scoped) system property whose name is the same as
the SPI's fully qualified class name (as given by SPI.class.getName()).
The <code>ScopedProperties</code> class provides a way to bind
properties by classloader, in a secure hierarchy similar in concept
to the way classloader find class and resource files.
See <code>ScopedProperties</code> for more details.
<p>If the ScopedProperties are not set by users, then behaviour
is equivalent to <code>System.getProperty()</code>.
</p>
</li>
<p><li>
The value of a <code>Properties properties</code> property, if provided
as a parameter, whose name is the same as the SPI's fully qualifed class
name (as given by SPI.class.getName()).
</li></p>
<p><li>
The value obtained using the JDK1.3+ 'Service Provider' specification
(http://java.sun.com/j2se/1.3/docs/guide/jar/jar.html) to locate a
service named <code>SPI.class.getName()</code>. This is implemented
internally, so there is not a dependency on JDK 1.3+.
</li></p>
</ul>
</li></p>
<p><li>
If the name of the implementation class is non-null, load that class.
The class loaded is the first class loaded by the following sequence
of class loaders:
<ul>
<li>Thread Context Class Loader</li>
<li>DiscoverSingleton's Caller's Class Loader</li>
<li>SPI's Class Loader</li>
<li>DiscoverSingleton's (this class or wrapper) Class Loader</li>
<li>System Class Loader</li>
</ul>
An exception is thrown if the class cannot be loaded.
</li></p>
<p><li>
If the name of the implementation class is null, AND the default
implementation class name (<code>defaultImpl</code>) is null,
then an exception is thrown.
</li></p>
<p><li>
If the name of the implementation class is null, AND the default
implementation class (<code>defaultImpl</code>) is non-null,
then load the default implementation class. The class loaded is the
first class loaded by the following sequence of class loaders:
<ul>
<li>SPI's Class Loader</li>
<li>DiscoverSingleton's (this class or wrapper) Class Loader</li>
<li>System Class Loader</li>
</ul>
<p>
This limits the scope in which the default class loader can be found
to the SPI, DiscoverSingleton, and System class loaders. The assumption here
is that the default implementation is closely associated with the SPI
or system, and is not defined in the user's application space.
</p>
<p>
An exception is thrown if the class cannot be loaded.
</p>
</li></p>
<p><li>
Verify that the loaded class implements the SPI: an exception is thrown
if the loaded class does not implement the SPI.
</li></p>
</ul>
</p>
<p><strong>IMPLEMENTATION NOTE</strong> - This implementation is modelled
after the SAXParserFactory and DocumentBuilderFactory implementations
(corresponding to the JAXP pluggability APIs) found in Apache Xerces.
</p></div>
<dl><dt><span class="strong">Version:</span></dt>
<dd>$Revision: 1090010 $ $Date: 2011-04-07 23:05:58 +0200 (jeu. 07 avril 2011) $</dd></dl>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#nullProperties">nullProperties</a></strong></code>
<div class="block">Readable placeholder for a null value.</div>
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<h3>Constructor Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#DiscoverClass()">DiscoverClass</a></strong>()</code>
<div class="block">Create a class instance with dynamic environment
(thread context class loader is determined on each call).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#DiscoverClass(org.apache.commons.discovery.resource.ClassLoaders)">DiscoverClass</a></strong>(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> classLoaders)</code>
<div class="block">Create a class instance with dynamic environment
(thread context class loader is determined on each call).</div>
</td>
</tr>
</table>
</li>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <T> java.lang.String[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#discoverClassNames(org.apache.commons.discovery.tools.SPInterface, java.util.Properties)">discoverClassNames</a></strong>(<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
java.util.Properties properties)</code>
<div class="block">Discover names of SPI implementation Classes from properties.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(java.lang.Class)">find</a></strong>(java.lang.Class<T> spiClass)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(java.lang.Class, java.util.Properties)">find</a></strong>(java.lang.Class<T> spiClass,
java.util.Properties properties)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(java.lang.Class, java.util.Properties, java.lang.String)">find</a></strong>(java.lang.Class<T> spiClass,
java.util.Properties properties,
java.lang.String defaultImpl)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(java.lang.Class, java.lang.String)">find</a></strong>(java.lang.Class<T> spiClass,
java.lang.String defaultImpl)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(java.lang.Class, java.lang.String, java.lang.String)">find</a></strong>(java.lang.Class<T> spiClass,
java.lang.String propertiesFileName,
java.lang.String defaultImpl)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <T,S extends T> <br>java.lang.Class<S></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#find(org.apache.commons.discovery.resource.ClassLoaders, org.apache.commons.discovery.tools.SPInterface, org.apache.commons.discovery.tools.PropertiesHolder, org.apache.commons.discovery.tools.DefaultClassHolder)">find</a></strong>(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders,
<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
<a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a> properties,
<a href="../../../../../org/apache/commons/discovery/tools/DefaultClassHolder.html" title="class in org.apache.commons.discovery.tools">DefaultClassHolder</a><T> defaultImpl)</code>
<div class="block">Find class implementing SPI.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#getClassLoaders(java.lang.Class)">getClassLoaders</a></strong>(java.lang.Class<?> spiClass)</code>
<div class="block">Return the class loaders holder for the given SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#getManagedProperty(java.lang.String)">getManagedProperty</a></strong>(java.lang.String propertyName)</code>
<div class="block">Load the class whose name is given by the value of a (Managed)
System Property.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(java.lang.Class)">newInstance</a></strong>(java.lang.Class<T> spiClass)</code>
<div class="block">Create new instance of class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(java.lang.Class, java.util.Properties)">newInstance</a></strong>(java.lang.Class<T> spiClass,
java.util.Properties properties)</code>
<div class="block">Create new instance of class implementing SPI.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(java.lang.Class, java.util.Properties, java.lang.String)">newInstance</a></strong>(java.lang.Class<T> spiClass,
java.util.Properties properties,
java.lang.String defaultImpl)</code>
<div class="block">Create new instance of class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(java.lang.Class, java.lang.String)">newInstance</a></strong>(java.lang.Class<T> spiClass,
java.lang.String defaultImpl)</code>
<div class="block">Create new instance of class implementing SPI.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(java.lang.Class, java.lang.String, java.lang.String)">newInstance</a></strong>(java.lang.Class<T> spiClass,
java.lang.String propertiesFileName,
java.lang.String defaultImpl)</code>
<div class="block">Create new instance of class implementing SPI.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/DiscoverClass.html#newInstance(org.apache.commons.discovery.resource.ClassLoaders, org.apache.commons.discovery.tools.SPInterface, org.apache.commons.discovery.tools.PropertiesHolder, org.apache.commons.discovery.tools.DefaultClassHolder)">newInstance</a></strong>(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders,
<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
<a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a> properties,
<a href="../../../../../org/apache/commons/discovery/tools/DefaultClassHolder.html" title="class in org.apache.commons.discovery.tools">DefaultClassHolder</a><T> defaultImpl)</code>
<div class="block">Create new instance of class implementing SPI.</div>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static final <a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a> nullProperties</pre>
<div class="block">Readable placeholder for a null value.</div>
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<pre>public DiscoverClass()</pre>
<div class="block">Create a class instance with dynamic environment
(thread context class loader is determined on each call).
Dynamically construct class loaders on each call.</div>
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<pre>public DiscoverClass(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> classLoaders)</pre>
<div class="block">Create a class instance with dynamic environment
(thread context class loader is determined on each call).
Cache static list of class loaders for each call.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>classLoaders</code> - The class loaders holder</dd></dl>
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<pre>public <a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> getClassLoaders(java.lang.Class<?> spiClass)</pre>
<div class="block">Return the class loaders holder for the given SPI.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - The SPI type</dd>
<dt><span class="strong">Returns:</span></dt><dd>The class loaders holder for the given SPI</dd></dl>
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<h4>find</h4>
<pre>public <T,S extends T> java.lang.Class<S> find(java.lang.Class<T> spiClass)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
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<pre>public <T,S extends T> java.lang.Class<S> find(java.lang.Class<T> spiClass,
java.util.Properties properties)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
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<pre>public <T,S extends T> java.lang.Class<S> find(java.lang.Class<T> spiClass,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>defaultImpl</code> - Default implementation name.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
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<pre>public <T,S extends T> java.lang.Class<S> find(java.lang.Class<T> spiClass,
java.util.Properties properties,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation,.</dd><dd><code>defaultImpl</code> - Default implementation class.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
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<pre>public <T,S extends T> java.lang.Class<S> find(java.lang.Class<T> spiClass,
java.lang.String propertiesFileName,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>propertiesFileName</code> - Used to determine name of SPI implementation,.</dd><dd><code>defaultImpl</code> - Default implementation class.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
</li>
</ul>
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<pre>public static <T,S extends T> java.lang.Class<S> find(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders,
<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
<a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a> properties,
<a href="../../../../../org/apache/commons/discovery/tools/DefaultClassHolder.html" title="class in org.apache.commons.discovery.tools">DefaultClassHolder</a><T> defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Find class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dd><code>S</code> - Any class extending T</dd><dt><span class="strong">Parameters:</span></dt><dd><code>loaders</code> - The class loaders holder</dd><dd><code>spi</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation,.</dd><dd><code>defaultImpl</code> - Default implementation class.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded, or if
the resulting class does not implement (or extend) the SPI.</dd></dl>
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<pre>public <T> T newInstance(java.lang.Class<T> spiClass)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
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<pre>public <T> T newInstance(java.lang.Class<T> spiClass,
java.util.Properties properties)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation,
and passed to implementation.init() method if
implementation implements Service interface.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
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<pre>public <T> T newInstance(java.lang.Class<T> spiClass,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>defaultImpl</code> - Default implementation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
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<pre>public <T> T newInstance(java.lang.Class<T> spiClass,
java.util.Properties properties,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation,
and passed to implementation.init() method if
implementation implements Service interface.</dd><dd><code>defaultImpl</code> - Default implementation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
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<pre>public <T> T newInstance(java.lang.Class<T> spiClass,
java.lang.String propertiesFileName,
java.lang.String defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spiClass</code> - Service Provider Interface Class.</dd><dd><code>propertiesFileName</code> - Used to determine name of SPI implementation,
and passed to implementation.init() method if
implementation implements Service interface.</dd><dd><code>defaultImpl</code> - Default implementation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
</li>
</ul>
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<pre>public static <T> T newInstance(<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders,
<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
<a href="../../../../../org/apache/commons/discovery/tools/PropertiesHolder.html" title="class in org.apache.commons.discovery.tools">PropertiesHolder</a> properties,
<a href="../../../../../org/apache/commons/discovery/tools/DefaultClassHolder.html" title="class in org.apache.commons.discovery.tools">DefaultClassHolder</a><T> defaultImpl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a>,
java.lang.InstantiationException,
java.lang.IllegalAccessException,
java.lang.NoSuchMethodException,
java.lang.reflect.InvocationTargetException</pre>
<div class="block">Create new instance of class implementing SPI.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>loaders</code> - The class loaders holder</dd><dd><code>spi</code> - Service Provider Interface Class.</dd><dd><code>properties</code> - Used to determine name of SPI implementation,
and passed to implementation.init() method if
implementation implements Service interface.</dd><dd><code>defaultImpl</code> - Default implementation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Instance of a class implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found, if the class cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI.</dd>
<dd><code>java.lang.InstantiationException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.IllegalAccessException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.NoSuchMethodException</code> - see <code>Class.newInstance()</code></dd>
<dd><code>java.lang.reflect.InvocationTargetException</code> - see <code>Class.newInstance()</code></dd></dl>
</li>
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<pre>public static <T> java.lang.String[] discoverClassNames(<a href="../../../../../org/apache/commons/discovery/tools/SPInterface.html" title="class in org.apache.commons.discovery.tools">SPInterface</a><T> spi,
java.util.Properties properties)</pre>
<div class="block"><p>Discover names of SPI implementation Classes from properties.
The names are the non-null values, in order, obtained from the following
resources:
<ul>
<li>ManagedProperty.getProperty(SPI.class.getName());</li>
<li>properties.getProperty(SPI.class.getName());</li>
</ul></div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The SPI type</dd><dt><span class="strong">Parameters:</span></dt><dd><code>spi</code> - The SPI representation</dd><dd><code>properties</code> - Properties that may define the implementation
class name(s).</dd>
<dt><span class="strong">Returns:</span></dt><dd>String[] Name of classes implementing the SPI.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></code> - Thrown if the name of a class implementing
the SPI cannot be found.</dd></dl>
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<pre>public static java.lang.String getManagedProperty(java.lang.String propertyName)</pre>
<div class="block">Load the class whose name is given by the value of a (Managed)
System Property.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>propertyName</code> - the name of the system property whose value is
the name of the class to load.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The managed property value</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/discovery/tools/ManagedProperties.html" title="class in org.apache.commons.discovery.tools"><code>ManagedProperties</code></a></dd></dl>
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