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17 package org.apache.logging.log4j.util;
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19 import java.io.Serializable;
20 import java.util.ArrayList;
21 import java.util.List;
22 import java.util.Map;
23 import java.util.Objects;
24 import java.util.concurrent.ConcurrentHashMap;
25 import java.util.regex.Matcher;
26 import java.util.regex.Pattern;
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33 public interface PropertySource {
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41 int getPriority();
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48 void forEach(BiConsumer<String, String> action);
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57 CharSequence getNormalForm(Iterable<? extends CharSequence> tokens);
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64 class Comparator implements java.util.Comparator<PropertySource>, Serializable {
65 private static final long serialVersionUID = 1L;
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67 @Override
68 public int compare(final PropertySource o1, final PropertySource o2) {
69 return Integer.compare(Objects.requireNonNull(o1).getPriority(), Objects.requireNonNull(o2).getPriority());
70 }
71 }
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78 final class Util {
79 private static final String PREFIXES = "(?i:^log4j2?[-._/]?|^org\\.apache\\.logging\\.log4j\\.)?";
80 private static final Pattern PROPERTY_TOKENIZER = Pattern.compile(PREFIXES + "([A-Z]*[a-z0-9]+|[A-Z0-9]+)[-._/]?");
81 private static final Map<CharSequence, List<CharSequence>> CACHE = new ConcurrentHashMap<>();
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92 public static List<CharSequence> tokenize(final CharSequence value) {
93 if (CACHE.containsKey(value)) {
94 return CACHE.get(value);
95 }
96 final List<CharSequence> tokens = new ArrayList<>();
97 final Matcher matcher = PROPERTY_TOKENIZER.matcher(value);
98 while (matcher.find()) {
99 tokens.add(matcher.group(1).toLowerCase());
100 }
101 CACHE.put(value, tokens);
102 return tokens;
103 }
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111 public static CharSequence joinAsCamelCase(final Iterable<? extends CharSequence> tokens) {
112 final StringBuilder sb = new StringBuilder();
113 boolean first = true;
114 for (final CharSequence token : tokens) {
115 if (first) {
116 sb.append(token);
117 } else {
118 sb.append(Character.toUpperCase(token.charAt(0)));
119 if (token.length() > 1) {
120 sb.append(token.subSequence(1, token.length()));
121 }
122 }
123 first = false;
124 }
125 return sb.toString();
126 }
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128 private Util() {
129 }
130 }
131 }