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OptionConverter (Apache Log4j 1.2.15 API)
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org.apache.log4j.helpers</FONT>
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Class OptionConverter</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.log4j.helpers.OptionConverter</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>OptionConverter</B><DT>extends java.lang.Object</DL>
</PRE>
<P>
A convenience class to convert property values to specific types.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Ceki Gülcü, Simon Kitching;, Anders Kristensen</DD>
</DL>
<HR>
<P>
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<CODE>static java.lang.String[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#concatanateArrays(java.lang.String[], java.lang.String[])">concatanateArrays</A></B>(java.lang.String[] l,
java.lang.String[] r)</CODE>
<BR>
</TD>
</TR>
<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/log4j/helpers/OptionConverter.html#convertSpecialChars(java.lang.String)">convertSpecialChars</A></B>(java.lang.String s)</CODE>
<BR>
</TD>
</TR>
<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/log4j/helpers/OptionConverter.html#findAndSubst(java.lang.String, java.util.Properties)">findAndSubst</A></B>(java.lang.String key,
java.util.Properties props)</CODE>
<BR>
Find the value corresponding to <code>key</code> in
<code>props</code>.</TD>
</TR>
<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/log4j/helpers/OptionConverter.html#getSystemProperty(java.lang.String, java.lang.String)">getSystemProperty</A></B>(java.lang.String key,
java.lang.String def)</CODE>
<BR>
Very similar to <code>System.getProperty</code> except
that the <CODE>SecurityException</CODE> is hidden.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#instantiateByClassName(java.lang.String, java.lang.Class, java.lang.Object)">instantiateByClassName</A></B>(java.lang.String className,
java.lang.Class superClass,
java.lang.Object defaultValue)</CODE>
<BR>
Instantiate an object given a class name.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#instantiateByKey(java.util.Properties, java.lang.String, java.lang.Class, java.lang.Object)">instantiateByKey</A></B>(java.util.Properties props,
java.lang.String key,
java.lang.Class superClass,
java.lang.Object defaultValue)</CODE>
<BR>
</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/log4j/helpers/OptionConverter.html#selectAndConfigure(java.net.URL, java.lang.String, org.apache.log4j.spi.LoggerRepository)">selectAndConfigure</A></B>(java.net.URL url,
java.lang.String clazz,
<A HREF="../../../../org/apache/log4j/spi/LoggerRepository.html" title="interface in org.apache.log4j.spi">LoggerRepository</A> hierarchy)</CODE>
<BR>
Configure log4j given a URL.</TD>
</TR>
<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/log4j/helpers/OptionConverter.html#substVars(java.lang.String, java.util.Properties)">substVars</A></B>(java.lang.String val,
java.util.Properties props)</CODE>
<BR>
Perform variable substitution in string <code>val</code> from the
values of keys found in the system propeties.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#toBoolean(java.lang.String, boolean)">toBoolean</A></B>(java.lang.String value,
boolean dEfault)</CODE>
<BR>
If <code>value</code> is "true", then <code>true</code> is
returned.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#toFileSize(java.lang.String, long)">toFileSize</A></B>(java.lang.String value,
long dEfault)</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#toInt(java.lang.String, int)">toInt</A></B>(java.lang.String value,
int dEfault)</CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/log4j/helpers/OptionConverter.html#toLevel(java.lang.String, org.apache.log4j.Level)">toLevel</A></B>(java.lang.String value,
<A HREF="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</A> defaultValue)</CODE>
<BR>
Converts a standard or custom priority level to a Level
object.</TD>
</TR>
</TABLE>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
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<P>
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<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="concatanateArrays(java.lang.String[], java.lang.String[])"><!-- --></A><H3>
concatanateArrays</H3>
<PRE>
public static java.lang.String[] <B>concatanateArrays</B>(java.lang.String[] l,
java.lang.String[] r)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="convertSpecialChars(java.lang.String)"><!-- --></A><H3>
convertSpecialChars</H3>
<PRE>
public static java.lang.String <B>convertSpecialChars</B>(java.lang.String s)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getSystemProperty(java.lang.String, java.lang.String)"><!-- --></A><H3>
getSystemProperty</H3>
<PRE>
public static java.lang.String <B>getSystemProperty</B>(java.lang.String key,
java.lang.String def)</PRE>
<DL>
<DD>Very similar to <code>System.getProperty</code> except
that the <CODE>SecurityException</CODE> is hidden.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - The key to search for.<DD><CODE>def</CODE> - The default value to return.
<DT><B>Returns:</B><DD>the string value of the system property, or the default
value if there is no property with that key.<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="instantiateByKey(java.util.Properties, java.lang.String, java.lang.Class, java.lang.Object)"><!-- --></A><H3>
instantiateByKey</H3>
<PRE>
public static java.lang.Object <B>instantiateByKey</B>(java.util.Properties props,
java.lang.String key,
java.lang.Class superClass,
java.lang.Object defaultValue)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="toBoolean(java.lang.String, boolean)"><!-- --></A><H3>
toBoolean</H3>
<PRE>
public static boolean <B>toBoolean</B>(java.lang.String value,
boolean dEfault)</PRE>
<DL>
<DD>If <code>value</code> is "true", then <code>true</code> is
returned. If <code>value</code> is "false", then
<code>true</code> is returned. Otherwise, <code>default</code> is
returned.
<p>Case of value is unimportant.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="toInt(java.lang.String, int)"><!-- --></A><H3>
toInt</H3>
<PRE>
public static int <B>toInt</B>(java.lang.String value,
int dEfault)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="toLevel(java.lang.String, org.apache.log4j.Level)"><!-- --></A><H3>
toLevel</H3>
<PRE>
public static <A HREF="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</A> <B>toLevel</B>(java.lang.String value,
<A HREF="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</A> defaultValue)</PRE>
<DL>
<DD>Converts a standard or custom priority level to a Level
object. <p> If <code>value</code> is of form
"level#classname", then the specified class' toLevel method
is called to process the specified level string; if no '#'
character is present, then the default <A HREF="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j"><CODE>Level</CODE></A>
class is used to process the level value.
<p>As a special case, if the <code>value</code> parameter is
equal to the string "NULL", then the value <code>null</code> will
be returned.
<p> If any error occurs while converting the value to a level,
the <code>defaultValue</code> parameter, which may be
<code>null</code>, is returned.
<p> Case of <code>value</code> is insignificant for the level level, but is
significant for the class name part, if present.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="toFileSize(java.lang.String, long)"><!-- --></A><H3>
toFileSize</H3>
<PRE>
public static long <B>toFileSize</B>(java.lang.String value,
long dEfault)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="findAndSubst(java.lang.String, java.util.Properties)"><!-- --></A><H3>
findAndSubst</H3>
<PRE>
public static java.lang.String <B>findAndSubst</B>(java.lang.String key,
java.util.Properties props)</PRE>
<DL>
<DD>Find the value corresponding to <code>key</code> in
<code>props</code>. Then perform variable substitution on the
found value.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="instantiateByClassName(java.lang.String, java.lang.Class, java.lang.Object)"><!-- --></A><H3>
instantiateByClassName</H3>
<PRE>
public static java.lang.Object <B>instantiateByClassName</B>(java.lang.String className,
java.lang.Class superClass,
java.lang.Object defaultValue)</PRE>
<DL>
<DD>Instantiate an object given a class name. Check that the
<code>className</code> is a subclass of
<code>superClass</code>. If that test fails or the object could
not be instantiated, then <code>defaultValue</code> is returned.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>className</CODE> - The fully qualified class name of the object to instantiate.<DD><CODE>superClass</CODE> - The class to which the new object should belong.<DD><CODE>defaultValue</CODE> - The object to return in case of non-fulfillment</DL>
</DD>
</DL>
<HR>
<A NAME="substVars(java.lang.String, java.util.Properties)"><!-- --></A><H3>
substVars</H3>
<PRE>
public static java.lang.String <B>substVars</B>(java.lang.String val,
java.util.Properties props)
throws java.lang.IllegalArgumentException</PRE>
<DL>
<DD>Perform variable substitution in string <code>val</code> from the
values of keys found in the system propeties.
<p>The variable substitution delimeters are <b>${</b> and <b>}</b>.
<p>For example, if the System properties contains "key=value", then
the call
<pre>
String s = OptionConverter.substituteVars("Value of key is ${key}.");
</pre>
will set the variable <code>s</code> to "Value of key is value.".
<p>If no value could be found for the specified key, then the
<code>props</code> parameter is searched, if the value could not
be found there, then substitution defaults to the empty string.
<p>For example, if system propeties contains no value for the key
"inexistentKey", then the call
<pre>
String s = OptionConverter.subsVars("Value of inexistentKey is [${inexistentKey}]");
</pre>
will set <code>s</code> to "Value of inexistentKey is []"
<p>An <CODE>IllegalArgumentException</CODE> is thrown if
<code>val</code> contains a start delimeter "${" which is not
balanced by a stop delimeter "}". </p>
<p><b>Author</b> Avy Sharell</a></p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>val</CODE> - The string on which variable substitution is performed.
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if <code>val</code> is malformed.</DL>
</DD>
</DL>
<HR>
<A NAME="selectAndConfigure(java.net.URL, java.lang.String, org.apache.log4j.spi.LoggerRepository)"><!-- --></A><H3>
selectAndConfigure</H3>
<PRE>
public static void <B>selectAndConfigure</B>(java.net.URL url,
java.lang.String clazz,
<A HREF="../../../../org/apache/log4j/spi/LoggerRepository.html" title="interface in org.apache.log4j.spi">LoggerRepository</A> hierarchy)</PRE>
<DL>
<DD>Configure log4j given a URL.
<p>The url must point to a file or resource which will be interpreted by
a new instance of a log4j configurator.
<p>All configurations steps are taken on the
<code>hierarchy</code> passed as a parameter.
<p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>url</CODE> - The location of the configuration file or resource.<DD><CODE>clazz</CODE> - The classname, of the log4j configurator which will parse
the file or resource at <code>url</code>. This must be a subclass of
<A HREF="../../../../org/apache/log4j/spi/Configurator.html" title="interface in org.apache.log4j.spi"><CODE>Configurator</CODE></A>, or null. If this value is null then a default
configurator of <A HREF="../../../../org/apache/log4j/PropertyConfigurator.html" title="class in org.apache.log4j"><CODE>PropertyConfigurator</CODE></A> is used, unless the
filename pointed to by <code>url</code> ends in '.xml', in which case
<A HREF="../../../../org/apache/log4j/xml/DOMConfigurator.html" title="class in org.apache.log4j.xml"><CODE>DOMConfigurator</CODE></A> is used.<DD><CODE>hierarchy</CODE> - The <A HREF="../../../../org/apache/log4j/Hierarchy.html" title="class in org.apache.log4j"><CODE>Hierarchy</CODE></A> to act on.<DT><B>Since:</B></DT>
<DD>1.1.4</DD>
</DL>
</DD>
</DL>
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