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ClassUtils (Commons Discovery (Version 0.5-SNAPSHOT))
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org.apache.commons.discovery.tools</FONT>
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Class ClassUtils</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.commons.discovery.tools.ClassUtils</B>
</PRE>
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<DL>
<DT><PRE>public class <B>ClassUtils</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
Various utilities to interact with <code>Class</code> types.
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<P>
<HR>
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<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#ClassUtils()">ClassUtils</A></B>()</CODE>
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<CODE>static java.lang.reflect.Method</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#findPublicStaticMethod(java.lang.Class, java.lang.Class, java.lang.String, java.lang.Class[])">findPublicStaticMethod</A></B>(java.lang.Class<?> clazz,
java.lang.Class<?> returnType,
java.lang.String methodName,
java.lang.Class<?>[] paramTypes)</CODE>
<BR>
Looks for <code>public static returnType methodName(paramTypes)</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#getPackageName(java.lang.Class)">getPackageName</A></B>(java.lang.Class<?> clazz)</CODE>
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Get package name.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<CODE>static
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<TD NOWRAP><FONT SIZE="-1">
<CODE><T> T</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#newInstance(java.lang.Class, java.lang.Class[], java.lang.Object[])">newInstance</A></B>(java.lang.Class<T> impl,
java.lang.Class<?>[] paramClasses,
java.lang.Object[] params)</CODE>
<BR>
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.
</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#setLog(org.apache.commons.logging.Log)">setLog</A></B>(org.apache.commons.logging.Log _log)</CODE>
<BR>
<B>Deprecated.</B> <I>This method is not thread-safe</I></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/commons/discovery/tools/ClassUtils.html#verifyAncestory(java.lang.Class, java.lang.Class)">verifyAncestory</A></B>(java.lang.Class<?> spi,
java.lang.Class<?> impl)</CODE>
<BR>
Throws exception if <code>impl</code> does not
implement or extend the SPI.</TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="ClassUtils()"><!-- --></A><H3>
ClassUtils</H3>
<PRE>
public <B>ClassUtils</B>()</PRE>
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<A NAME="setLog(org.apache.commons.logging.Log)"><!-- --></A><H3>
setLog</H3>
<PRE>
<FONT SIZE="-1">@Deprecated
</FONT>public static void <B>setLog</B>(org.apache.commons.logging.Log _log)</PRE>
<DL>
<DD><B>Deprecated.</B> <I>This method is not thread-safe</I>
<P>
<DD>Sets the <code>Log</code> for this class.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>_log</CODE> - This class <code>Log</code></DL>
</DD>
</DL>
<HR>
<A NAME="getPackageName(java.lang.Class)"><!-- --></A><H3>
getPackageName</H3>
<PRE>
public static java.lang.String <B>getPackageName</B>(java.lang.Class<?> clazz)</PRE>
<DL>
<DD>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.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>clazz</CODE> - The class from which the package has to be extracted
<DT><B>Returns:</B><DD>The string representation of the input class package</DL>
</DD>
</DL>
<HR>
<A NAME="findPublicStaticMethod(java.lang.Class, java.lang.Class, java.lang.String, java.lang.Class[])"><!-- --></A><H3>
findPublicStaticMethod</H3>
<PRE>
public static java.lang.reflect.Method <B>findPublicStaticMethod</B>(java.lang.Class<?> clazz,
java.lang.Class<?> returnType,
java.lang.String methodName,
java.lang.Class<?>[] paramTypes)</PRE>
<DL>
<DD>Looks for <code>public static returnType methodName(paramTypes)</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>clazz</CODE> - The class where looking for the method<DD><CODE>returnType</CODE> - The method return type<DD><CODE>methodName</CODE> - The method name<DD><CODE>paramTypes</CODE> - The method arguments types
<DT><B>Returns:</B><DD>Method <code>public static returnType methodName(paramTypes)</code>,
if found to be <strong>directly</strong> implemented by clazz.</DL>
</DD>
</DL>
<HR>
<A NAME="newInstance(java.lang.Class, java.lang.Class[], java.lang.Object[])"><!-- --></A><H3>
newInstance</H3>
<PRE>
public static <T> T <B>newInstance</B>(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>
<DL>
<DD>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>
</ul>
<P>
<DD><DL>
<DT><B>Type Parameters:</B><DD><CODE>T</CODE> - The class type has to be instantiated<DT><B>Parameters:</B><DD><CODE>impl</CODE> - The class has to be instantiated<DD><CODE>paramClasses</CODE> - The constructor arguments types (can be <code>null</code>)<DD><CODE>params</CODE> - The constructor arguments values (can be <code>null</code>)
<DT><B>Returns:</B><DD>A new class instance
<DT><B>Throws:</B>
<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><CODE>java.lang.InstantiationException</CODE> - see <CODE>Class.newInstance()</CODE>
<DD><CODE>java.lang.IllegalAccessException</CODE> - see <CODE>Class.newInstance()</CODE>
<DD><CODE>java.lang.NoSuchMethodException</CODE> - see <CODE>Class.newInstance()</CODE>
<DD><CODE>java.lang.reflect.InvocationTargetException</CODE> - see <CODE>Class.newInstance()</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="verifyAncestory(java.lang.Class, java.lang.Class)"><!-- --></A><H3>
verifyAncestory</H3>
<PRE>
public static void <B>verifyAncestory</B>(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>
<DL>
<DD>Throws exception if <code>impl</code> does not
implement or extend the SPI.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>spi</CODE> - The SPI type<DD><CODE>impl</CODE> - The class has to be verified is a SPI implementation/extension
<DT><B>Throws:</B>
<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</DL>
</DD>
</DL>
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