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<h2 title="Class ResourceUtils" class="title">Class ResourceUtils</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="strong">ResourceUtils</span>
extends java.lang.Object</pre>
<div class="block">Mechanisms to locate and load a class.
The load methods locate a class only.
The find methods locate a class and verify that the
class implements an given interface or extends a given class.</div>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ResourceUtils.html#ResourceUtils()">ResourceUtils</a></strong>()</code> </td>
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<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ResourceUtils.html#getPackageName(java.lang.Class)">getPackageName</a></strong>(java.lang.Class<?> clazz)</code>
<div class="block">Get package name.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/commons/discovery/Resource.html" title="class in org.apache.commons.discovery">Resource</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ResourceUtils.html#getResource(java.lang.Class, java.lang.String, org.apache.commons.discovery.resource.ClassLoaders)">getResource</a></strong>(java.lang.Class<?> spi,
java.lang.String resourceName,
<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders)</code>
<div class="block">Load the resource <code>resourceName</code>.</div>
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<td class="colFirst"><code>static java.util.Properties</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ResourceUtils.html#loadProperties(java.lang.Class, java.lang.String, org.apache.commons.discovery.resource.ClassLoaders)">loadProperties</a></strong>(java.lang.Class<?> spi,
java.lang.String propertiesFileName,
<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> classLoaders)</code>
<div class="block">Load named property file, optionally qualified by spi's package name
as per Class.getResource.</div>
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<pre>public ResourceUtils()</pre>
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<pre>public static java.lang.String getPackageName(java.lang.Class<?> clazz)</pre>
<div class="block">Get package name.
Not all class loaders 'keep' package information,
in which case Class.getPackage() returns null.
This means that calling Class.getPackage().getName()
is unreliable at best.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>clazz</code> - The class from which the package has to be extracted</dd>
<dt><span class="strong">Returns:</span></dt><dd>The string representation of the input class package</dd></dl>
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<h4>getResource</h4>
<pre>public static <a href="../../../../../org/apache/commons/discovery/Resource.html" title="class in org.apache.commons.discovery">Resource</a> getResource(java.lang.Class<?> spi,
java.lang.String resourceName,
<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> loaders)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Load the resource <code>resourceName</code>.
Try each classloader in succession,
until first succeeds, or all fail.
If all fail and <code>resouceName</code> is not absolute
(doesn't start with '/' character), then retry with
<code>packageName/resourceName</code> after changing all
'.' to '/'.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>spi</code> - The SPI type</dd><dd><code>resourceName</code> - The name of the resource to load.</dd><dd><code>loaders</code> - the class loaders holder</dd>
<dt><span class="strong">Returns:</span></dt><dd>The discovered <a href="../../../../../org/apache/commons/discovery/Resource.html" title="class in org.apache.commons.discovery"><code>Resource</code></a> instance</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> - if the class implementing
the SPI cannot be found, cannot be loaded and
instantiated, or if the resulting class does not implement
(or extend) the SPI</dd></dl>
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<h4>loadProperties</h4>
<pre>public static java.util.Properties loadProperties(java.lang.Class<?> spi,
java.lang.String propertiesFileName,
<a href="../../../../../org/apache/commons/discovery/resource/ClassLoaders.html" title="class in org.apache.commons.discovery.resource">ClassLoaders</a> classLoaders)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Load named property file, optionally qualified by spi's package name
as per Class.getResource.
A property file is loaded using 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) Class Loader</li>
<li>System Class Loader</li>
</ul></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>spi</code> - The SPI type</dd><dd><code>propertiesFileName</code> - The property file name.</dd><dd><code>classLoaders</code> - The class loaders holder</dd>
<dt><span class="strong">Returns:</span></dt><dd>The loaded named property file, in <code>Properties</code> format</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></dl>
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