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<div class="subTitle">org.apache.log4j.helpers</div>
<h2 title="Class OptionConverter" class="title">Class OptionConverter</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.log4j.helpers.OptionConverter</li>
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<pre>public class <span class="typeNameLabel">OptionConverter</span>
extends java.lang.Object</pre>
<div class="block">A convenience class to convert property values to specific types.</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Ceki Gülcü, Simon Kitching;, Anders Kristensen</dd>
</dl>
</li>
</ul>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>static java.lang.String[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#concatanateArrays-java.lang.String:A-java.lang.String:A-">concatanateArrays</a></span>(java.lang.String[] l,
java.lang.String[] r)</code> </td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#convertSpecialChars-java.lang.String-">convertSpecialChars</a></span>(java.lang.String s)</code> </td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#findAndSubst-java.lang.String-java.util.Properties-">findAndSubst</a></span>(java.lang.String key,
java.util.Properties props)</code>
<div class="block">Find the value corresponding to <code>key</code> in
<code>props</code>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#getSystemProperty-java.lang.String-java.lang.String-">getSystemProperty</a></span>(java.lang.String key,
java.lang.String def)</code>
<div class="block">Very similar to <code>System.getProperty</code> except
that the <code>SecurityException</code> is hidden.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#instantiateByClassName-java.lang.String-java.lang.Class-java.lang.Object-">instantiateByClassName</a></span>(java.lang.String className,
java.lang.Class superClass,
java.lang.Object defaultValue)</code>
<div class="block">Instantiate an object given a class name.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#instantiateByKey-java.util.Properties-java.lang.String-java.lang.Class-java.lang.Object-">instantiateByKey</a></span>(java.util.Properties props,
java.lang.String key,
java.lang.Class superClass,
java.lang.Object defaultValue)</code> </td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#selectAndConfigure-java.io.InputStream-java.lang.String-org.apache.log4j.spi.LoggerRepository-">selectAndConfigure</a></span>(java.io.InputStream inputStream,
java.lang.String clazz,
<a href="../../../../org/apache/log4j/spi/LoggerRepository.html" title="interface in org.apache.log4j.spi">LoggerRepository</a> hierarchy)</code>
<div class="block">Configure log4j given an <code>InputStream</code>.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#selectAndConfigure-java.net.URL-java.lang.String-org.apache.log4j.spi.LoggerRepository-">selectAndConfigure</a></span>(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>
<div class="block">Configure log4j given a URL.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#substVars-java.lang.String-java.util.Properties-">substVars</a></span>(java.lang.String val,
java.util.Properties props)</code>
<div class="block">Perform variable substitution in string <code>val</code> from the
values of keys found in the system propeties.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#toBoolean-java.lang.String-boolean-">toBoolean</a></span>(java.lang.String value,
boolean dEfault)</code>
<div class="block">If <code>value</code> is "true", then <code>true</code> is
returned.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#toFileSize-java.lang.String-long-">toFileSize</a></span>(java.lang.String value,
long dEfault)</code> </td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#toInt-java.lang.String-int-">toInt</a></span>(java.lang.String value,
int dEfault)</code> </td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/helpers/OptionConverter.html#toLevel-java.lang.String-org.apache.log4j.Level-">toLevel</a></span>(java.lang.String value,
<a href="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</a> defaultValue)</code>
<div class="block">Converts a standard or custom priority level to a Level
object.</div>
</td>
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</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>concatanateArrays</h4>
<pre>public static java.lang.String[] concatanateArrays(java.lang.String[] l,
java.lang.String[] r)</pre>
</li>
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<a name="convertSpecialChars-java.lang.String-">
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<h4>convertSpecialChars</h4>
<pre>public static java.lang.String convertSpecialChars(java.lang.String s)</pre>
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<h4>getSystemProperty</h4>
<pre>public static java.lang.String getSystemProperty(java.lang.String key,
java.lang.String def)</pre>
<div class="block">Very similar to <code>System.getProperty</code> except
that the <code>SecurityException</code> is hidden.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - The key to search for.</dd>
<dd><code>def</code> - The default value to return.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the string value of the system property, or the default
value if there is no property with that key.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.1</dd>
</dl>
</li>
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<h4>instantiateByKey</h4>
<pre>public static java.lang.Object instantiateByKey(java.util.Properties props,
java.lang.String key,
java.lang.Class superClass,
java.lang.Object defaultValue)</pre>
</li>
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<h4>toBoolean</h4>
<pre>public static boolean toBoolean(java.lang.String value,
boolean dEfault)</pre>
<div class="block">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.</div>
</li>
</ul>
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<h4>toInt</h4>
<pre>public static int toInt(java.lang.String value,
int dEfault)</pre>
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<a name="toLevel-java.lang.String-org.apache.log4j.Level-">
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<h4>toLevel</h4>
<pre>public static <a href="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</a> toLevel(java.lang.String value,
<a href="../../../../org/apache/log4j/Level.html" title="class in org.apache.log4j">Level</a> defaultValue)</pre>
<div class="block">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.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.1</dd>
</dl>
</li>
</ul>
<a name="toFileSize-java.lang.String-long-">
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</a>
<ul class="blockList">
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<h4>toFileSize</h4>
<pre>public static long toFileSize(java.lang.String value,
long dEfault)</pre>
</li>
</ul>
<a name="findAndSubst-java.lang.String-java.util.Properties-">
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<li class="blockList">
<h4>findAndSubst</h4>
<pre>public static java.lang.String findAndSubst(java.lang.String key,
java.util.Properties props)</pre>
<div class="block">Find the value corresponding to <code>key</code> in
<code>props</code>. Then perform variable substitution on the
found value.</div>
</li>
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<a name="instantiateByClassName-java.lang.String-java.lang.Class-java.lang.Object-">
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<ul class="blockList">
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<h4>instantiateByClassName</h4>
<pre>public static java.lang.Object instantiateByClassName(java.lang.String className,
java.lang.Class superClass,
java.lang.Object defaultValue)</pre>
<div class="block">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.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>className</code> - The fully qualified class name of the object to instantiate.</dd>
<dd><code>superClass</code> - The class to which the new object should belong.</dd>
<dd><code>defaultValue</code> - The object to return in case of non-fulfillment</dd>
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<h4>substVars</h4>
<pre>public static java.lang.String substVars(java.lang.String val,
java.util.Properties props)
throws java.lang.IllegalArgumentException</pre>
<div class="block">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></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>val</code> - The string on which variable substitution is performed.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <code>val</code> is malformed.</dd>
</dl>
</li>
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<h4>selectAndConfigure</h4>
<pre>public static void selectAndConfigure(java.io.InputStream inputStream,
java.lang.String clazz,
<a href="../../../../org/apache/log4j/spi/LoggerRepository.html" title="interface in org.apache.log4j.spi">LoggerRepository</a> hierarchy)</pre>
<div class="block">Configure log4j given an <code>InputStream</code>.
<p>
The InputStream will be interpreted by a new instance of a log4j configurator.
</p>
<p>
All configurations steps are taken on the <code>hierarchy</code> passed as a parameter.
</p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>inputStream</code> - The configuration input stream.</dd>
<dd><code>clazz</code> - The class name, of the log4j configurator which will parse the <code>inputStream</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.</dd>
<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.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2.17</dd>
</dl>
</li>
</ul>
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<h4>selectAndConfigure</h4>
<pre>public static void selectAndConfigure(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>
<div class="block">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></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>url</code> - The location of the configuration file or resource.</dd>
<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>
<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.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.1.4</dd>
</dl>
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