log4j-core/src/main/java/org/apache/logging/log4j/core/layout/LevelPatternSelector.java [139:175]:
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    private LevelPatternSelector(
            final PatternMatch[] properties,
            final String defaultPattern,
            final boolean alwaysWriteExceptions,
            final boolean disableAnsi,
            final boolean noConsoleNoAnsi,
            final Configuration config) {
        boolean needsLocation = false;
        final PatternParser parser = PatternLayout.createPatternParser(config);
        for (final PatternMatch property : properties) {
            try {
                final List<PatternFormatter> list =
                        parser.parse(property.getPattern(), alwaysWriteExceptions, disableAnsi, noConsoleNoAnsi);
                final PatternFormatter[] formatters = list.toArray(PatternFormatter.EMPTY_ARRAY);
                formatterMap.put(property.getKey(), formatters);
                for (int i = 0; !needsLocation && i < formatters.length; ++i) {
                    needsLocation = formatters[i].requiresLocation();
                }

                patternMap.put(property.getKey(), property.getPattern());
            } catch (final RuntimeException ex) {
                throw new IllegalArgumentException("Cannot parse pattern '" + property.getPattern() + "'", ex);
            }
        }
        try {
            final List<PatternFormatter> list =
                    parser.parse(defaultPattern, alwaysWriteExceptions, disableAnsi, noConsoleNoAnsi);
            defaultFormatters = list.toArray(PatternFormatter.EMPTY_ARRAY);
            this.defaultPattern = defaultPattern;
            for (int i = 0; !needsLocation && i < defaultFormatters.length; ++i) {
                needsLocation = defaultFormatters[i].requiresLocation();
            }
        } catch (final RuntimeException ex) {
            throw new IllegalArgumentException("Cannot parse pattern '" + defaultPattern + "'", ex);
        }
        requiresLocation = needsLocation;
    }
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log4j-core/src/main/java/org/apache/logging/log4j/core/layout/MarkerPatternSelector.java [139:175]:
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    private MarkerPatternSelector(
            final PatternMatch[] properties,
            final String defaultPattern,
            final boolean alwaysWriteExceptions,
            final boolean disableAnsi,
            final boolean noConsoleNoAnsi,
            final Configuration config) {
        boolean needsLocation = false;
        final PatternParser parser = PatternLayout.createPatternParser(config);
        for (final PatternMatch property : properties) {
            try {
                final List<PatternFormatter> list =
                        parser.parse(property.getPattern(), alwaysWriteExceptions, disableAnsi, noConsoleNoAnsi);
                final PatternFormatter[] formatters = list.toArray(PatternFormatter.EMPTY_ARRAY);
                formatterMap.put(property.getKey(), formatters);
                for (int i = 0; !needsLocation && i < formatters.length; ++i) {
                    needsLocation = formatters[i].requiresLocation();
                }

                patternMap.put(property.getKey(), property.getPattern());
            } catch (final RuntimeException ex) {
                throw new IllegalArgumentException("Cannot parse pattern '" + property.getPattern() + "'", ex);
            }
        }
        try {
            final List<PatternFormatter> list =
                    parser.parse(defaultPattern, alwaysWriteExceptions, disableAnsi, noConsoleNoAnsi);
            defaultFormatters = list.toArray(PatternFormatter.EMPTY_ARRAY);
            this.defaultPattern = defaultPattern;
            for (int i = 0; !needsLocation && i < defaultFormatters.length; ++i) {
                needsLocation = defaultFormatters[i].requiresLocation();
            }
        } catch (final RuntimeException ex) {
            throw new IllegalArgumentException("Cannot parse pattern '" + defaultPattern + "'", ex);
        }
        requiresLocation = needsLocation;
    }
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