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## org.apache.log4j.pattern
Class PatternParser

    java.lang.Object
      org.apache.log4j.pattern.PatternParser

    public final class PatternParser

extends Object

Most of the work of the `EnhancedPatternLayout` class is delegated to the PatternParser class.

It is this class that parses conversion patterns and creates a chained list of `PatternConverters`.

Author:
  James P. Cakalic, Ceki Gülcü, Anders Kristensen, Paul Smith, Curt Arnold

Method Summary
`static Map` | `getFileNamePatternRules()` Get standard format specifiers for rolling file appender file specification.
`static Map` | `getPatternLayoutRules()` Get standard format specifiers for EnhancedPatternLayout.
`static void` | `parse(String pattern, List patternConverters, List formattingInfos, Map converterRegistry, Map rules)` Parse a format specifier.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getPatternLayoutRules

    public static Map getPatternLayoutRules()

  Get standard format specifiers for EnhancedPatternLayout.

  Returns:
    read-only map of format converter classes keyed by format specifier strings.

### getFileNamePatternRules

    public static Map getFileNamePatternRules()

  Get standard format specifiers for rolling file appender file specification.

  Returns:
    read-only map of format converter classes keyed by format specifier strings.

### parse

    public static void parse(String pattern,
                             List patternConverters,
                             List formattingInfos,
                             Map converterRegistry,
                             Map rules)

  Parse a format specifier.

  Parameters:
    `pattern` - pattern to parse.
    `patternConverters` - list to receive pattern converters.
    `formattingInfos` - list to receive field specifiers corresponding to pattern converters.
    `converterRegistry` - map of user-supported pattern converters keyed by format specifier, may be null.
    `rules` - map of stock pattern converters keyed by format specifier.

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