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<h2 title="Class ClassUtils" class="title">Class ClassUtils</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="strong">ClassUtils</span>
extends java.lang.Object</pre>
<div class="block">Various utilities to interact with <code>Class</code> types.</div>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#ClassUtils()">ClassUtils</a></strong>()</code> </td>
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<td class="colFirst"><code>static java.lang.reflect.Method</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#findPublicStaticMethod(java.lang.Class, java.lang.Class, java.lang.String, java.lang.Class[])">findPublicStaticMethod</a></strong>(java.lang.Class<?> clazz,
java.lang.Class<?> returnType,
java.lang.String methodName,
java.lang.Class<?>[] paramTypes)</code>
<div class="block">Looks for <code>public static returnType methodName(paramTypes)</code>.</div>
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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/ClassUtils.html#getPackageName(java.lang.Class)">getPackageName</a></strong>(java.lang.Class<?> clazz)</code>
<div class="block">Get package name.</div>
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<tr class="altColor">
<td class="colFirst"><code>static <T> T</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#newInstance(java.lang.Class, java.lang.Class[], java.lang.Object[])">newInstance</a></strong>(java.lang.Class<T> impl,
java.lang.Class<?>[] paramClasses,
java.lang.Object[] params)</code>
<div class="block">Creates a new instance of the input class using the following policy:
if <code>paramClasses</code> or <code>params</code> is null,
the default constructor will be used;
the public constructor with <code>paramClasses</code> arguments type,
with <code>params</code> as arguments value, will be used.
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#setLog(org.apache.commons.logging.Log)">setLog</a></strong>(org.apache.commons.logging.Log _log)</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>This method is not thread-safe</i></div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#verifyAncestory(java.lang.Class, java.lang.Class)">verifyAncestory</a></strong>(java.lang.Class<?> spi,
java.lang.Class<?> impl)</code>
<div class="block">Throws exception if <code>impl</code> does not
implement or extend the SPI.</div>
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<pre>public ClassUtils()</pre>
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<h4>setLog</h4>
<pre>@Deprecated
public static void setLog(org.apache.commons.logging.Log _log)</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>This method is not thread-safe</i></div>
<div class="block">Sets the <code>Log</code> for this class.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>_log</code> - This class <code>Log</code></dd></dl>
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<h4>getPackageName</h4>
<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>findPublicStaticMethod</h4>
<pre>public static java.lang.reflect.Method findPublicStaticMethod(java.lang.Class<?> clazz,
java.lang.Class<?> returnType,
java.lang.String methodName,
java.lang.Class<?>[] paramTypes)</pre>
<div class="block">Looks for <code>public static returnType methodName(paramTypes)</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>clazz</code> - The class where looking for the method</dd><dd><code>returnType</code> - The method return type</dd><dd><code>methodName</code> - The method name</dd><dd><code>paramTypes</code> - The method arguments types</dd>
<dt><span class="strong">Returns:</span></dt><dd>Method <code>public static returnType methodName(paramTypes)</code>,
if found to be <strong>directly</strong> implemented by clazz.</dd></dl>
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<pre>public static <T> T newInstance(java.lang.Class<T> impl,
java.lang.Class<?>[] paramClasses,
java.lang.Object[] params)
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">Creates a new instance of the input class using the following policy:
<ul>
<li>if <code>paramClasses</code> or <code>params</code> is null,
the default constructor will be used;</li>
<li>the public constructor with <code>paramClasses</code> arguments type,
with <code>params</code> as arguments value, will be used.</li>
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<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The class type has to be instantiated</dd><dt><span class="strong">Parameters:</span></dt><dd><code>impl</code> - The class has to be instantiated</dd><dd><code>paramClasses</code> - The constructor arguments types (can be <code>null</code>)</dd><dd><code>params</code> - The constructor arguments values (can be <code>null</code>)</dd>
<dt><span class="strong">Returns:</span></dt><dd>A new class 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>
<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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<h4>verifyAncestory</h4>
<pre>public static void verifyAncestory(java.lang.Class<?> spi,
java.lang.Class<?> impl)
throws <a href="../../../../../org/apache/commons/discovery/DiscoveryException.html" title="class in org.apache.commons.discovery">DiscoveryException</a></pre>
<div class="block">Throws exception if <code>impl</code> does not
implement or extend the SPI.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>spi</code> - The SPI type</dd><dd><code>impl</code> - The class has to be verified is a SPI implementation/extension</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 input implementation class is not an SPI implementation</dd></dl>
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