PHP LoggerOptionConverter::getSystemProperty方法代码示例

 public static function substVars($val, $props = null)
 {
     $sbuf = '';
     $i = 0;
     while (true) {
         $j = strpos($val, self::DELIM_START, $i);
         if ($j === false) {
             // no more variables
             if ($i == 0) {
                 // this is a simple string
                 return $val;
             } else {
                 // add the tail string which contails no variables and return the result.
                 $sbuf .= substr($val, $i);
                 return $sbuf;
             }
         } else {
             $sbuf .= substr($val, $i, $j - $i);
             $k = strpos($val, self::DELIM_STOP, $j);
             if ($k === false) {
                 // LoggerOptionConverter::substVars() has no closing brace. Opening brace
                 return '';
             } else {
                 $j += self::DELIM_START_LEN;
                 $key = substr($val, $j, $k - $j);
                 // first try in System properties
                 $replacement = LoggerOptionConverter::getSystemProperty($key, null);
                 // then try props parameter
                 if ($replacement == null and $props !== null) {
                     $replacement = @$props[$key];
                 }
                 if (!empty($replacement)) {
                     // Do variable substitution on the replacement string
                     // such that we can solve "Hello ${x2}" as "Hello p1"
                     // the where the properties are
                     // x1=p1
                     // x2=${x1}
                     $recursiveReplacement = LoggerOptionConverter::substVars($replacement, $props);
                     $sbuf .= $recursiveReplacement;
                 }
                 $i = $k + self::DELIM_STOP_LEN;
             }
         }
     }
 }

 /**
  * Perform variable substitution in string <var>$val</var> from the
  * values of keys found with the {@link getSystemProperty()} method.
  * 
  * <p>The variable substitution delimeters are <b>${</b> and <b>}</b>.
  * 
  * <p>For example, if the "MY_CONSTANT" contains "value", then
  * the call
  * <code>
  * $s = LoggerOptionConverter::substituteVars("Value of key is ${MY_CONSTANT}.");
  * </code>
  * will set the variable <i>$s</i> to "Value of key is value.".</p>
  * 
  * <p>If no value could be found for the specified key, then the
  * <var>$props</var> parameter is searched, if the value could not
  * be found there, then substitution defaults to the empty string.</p>
  * 
  * <p>For example, if {@link getSystemProperty()} cannot find any value for the key
  * "inexistentKey", then the call
  * <code>
  * $s = LoggerOptionConverter::substVars("Value of inexistentKey is [${inexistentKey}]");
  * </code>
  * will set <var>$s</var> to "Value of inexistentKey is []".</p>
  * 
  * <p>A warn is thrown if <var>$val</var> contains a start delimeter "${" 
  * which is not balanced by a stop delimeter "}" and an empty string is returned.</p>
  * 
  * @log4j-author Avy Sharell
  * 
  * @param string $val The string on which variable substitution is performed.
  * @param array $props
  * @return string
  *
  * @static
  */
 function substVars($val, $props = null)
 {
     LoggerLog::debug("LoggerOptionConverter::substVars():val=[{$val}]");
     $sbuf = '';
     $i = 0;
     while (true) {
         $j = strpos($val, LOG4PHP_OPTION_CONVERTER_DELIM_START, $i);
         if ($j === false) {
             LoggerLog::debug("LoggerOptionConverter::substVars() no more variables");
             // no more variables
             if ($i == 0) {
                 // this is a simple string
                 LoggerLog::debug("LoggerOptionConverter::substVars() simple string");
                 return $val;
             } else {
                 // add the tail string which contails no variables and return the result.
                 $sbuf .= substr($val, $i);
                 LoggerLog::debug("LoggerOptionConverter::substVars():sbuf=[{$sbuf}]. Returning sbuf");
                 return $sbuf;
             }
         } else {
             $sbuf .= substr($val, $i, $j - $i);
             LoggerLog::debug("LoggerOptionConverter::substVars():sbuf=[{$sbuf}]:i={$i}:j={$j}.");
             $k = strpos($val, LOG4PHP_OPTION_CONVERTER_DELIM_STOP, $j);
             if ($k === false) {
                 LoggerLog::warn("LoggerOptionConverter::substVars() " . "'{$val}' has no closing brace. Opening brace at position {$j}.");
                 return '';
             } else {
                 $j += LOG4PHP_OPTION_CONVERTER_DELIM_START_LEN;
                 $key = substr($val, $j, $k - $j);
                 // first try in System properties
                 $replacement = LoggerOptionConverter::getSystemProperty($key, null);
                 // then try props parameter
                 if ($replacement == null and $props !== null) {
                     $replacement = @$props[$key];
                 }
                 if (!empty($replacement)) {
                     // Do variable substitution on the replacement string
                     // such that we can solve "Hello ${x2}" as "Hello p1"
                     // the where the properties are
                     // x1=p1
                     // x2=${x1}
                     $recursiveReplacement = LoggerOptionConverter::substVars($replacement, $props);
                     $sbuf .= $recursiveReplacement;
                 }
                 $i = $k + LOG4PHP_OPTION_CONVERTER_DELIM_STOP_LEN;
             }
         }
     }
 }