1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 package org.apache.logging.log4j.core.pattern;
18
19 import java.util.List;
20
21 import org.apache.logging.log4j.core.LogEvent;
22 import org.apache.logging.log4j.core.config.Configuration;
23 import org.apache.logging.log4j.core.config.plugins.Plugin;
24 import org.apache.logging.log4j.core.layout.PatternLayout;
25
26
27
28
29 @Plugin(name = "equals", category = PatternConverter.CATEGORY)
30 @ConverterKeys({ "equals" })
31 public final class EqualsReplacementConverter extends LogEventPatternConverter {
32
33
34
35
36
37
38
39
40 public static EqualsReplacementConverter newInstance(final Configuration config, final String[] options) {
41 if (options.length != 3) {
42 LOGGER.error("Incorrect number of options on equals. Expected 3 received " + options.length);
43 return null;
44 }
45 if (options[0] == null) {
46 LOGGER.error("No pattern supplied on equals");
47 return null;
48 }
49 if (options[1] == null) {
50 LOGGER.error("No test string supplied on equals");
51 return null;
52 }
53 if (options[2] == null) {
54 LOGGER.error("No substitution supplied on equals");
55 return null;
56 }
57 final String p = options[1];
58 final PatternParser parser = PatternLayout.createPatternParser(config);
59 final List<PatternFormatter> formatters = parser.parse(options[0]);
60 return new EqualsReplacementConverter(formatters, p, options[2], parser);
61 }
62
63 private final List<PatternFormatter> formatters;
64
65 private final String substitution;
66
67 private final String testString;
68
69 private final PatternParser parser;
70
71
72
73
74
75
76
77
78
79 private EqualsReplacementConverter(final List<PatternFormatter> formatters, final String testString,
80 final String substitution, final PatternParser parser) {
81 super("equals", "equals");
82 this.testString = testString;
83 this.substitution = substitution;
84 this.formatters = formatters;
85 this.parser = parser;
86 }
87
88
89
90
91 @Override
92 public void format(final LogEvent event, final StringBuilder toAppendTo) {
93 final StringBuilder buf = new StringBuilder();
94 for (final PatternFormatter formatter : formatters) {
95 formatter.format(event, buf);
96 }
97 final String string = buf.toString();
98 toAppendTo.append(testString.equals(string) ? parseSubstitution(event) : string);
99 }
100
101
102
103
104
105
106
107 String parseSubstitution(final LogEvent event) {
108 final StringBuilder substitutionBuffer = new StringBuilder();
109
110 if (substitution.contains("%")) {
111
112 final List<PatternFormatter> substitutionFormatters = parser.parse(substitution);
113 for (final PatternFormatter formatter : substitutionFormatters) {
114 formatter.format(event, substitutionBuffer);
115 }
116 } else {
117 substitutionBuffer.append(substitution);
118 }
119 return substitutionBuffer.toString();
120 }
121 }