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17 package org.apache.logging.log4j.core.pattern;
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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;
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29 @Plugin(name = "style", category = "Converter")
30 @ConverterKeys({ "style" })
31 public final class StyleConverter extends LogEventPatternConverter implements AnsiConverter {
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43 public static StyleConverter newInstance(final Configuration config, final String[] options) {
44 if (options.length < 1) {
45 LOGGER.error("Incorrect number of options on style. Expected at least 1, received " + options.length);
46 return null;
47 }
48 if (options[0] == null) {
49 LOGGER.error("No pattern supplied on style");
50 return null;
51 }
52 if (options[1] == null) {
53 LOGGER.error("No style attributes provided");
54 return null;
55 }
56 final PatternParser parser = PatternLayout.createPatternParser(config);
57 final List<PatternFormatter> formatters = parser.parse(options[0]);
58 final String style = AnsiEscape.createSequence(options[1].split("\\s*,\\s*"));
59 final boolean noConsoleNoAnsi = options.length > 2
60 && (PatternParser.NO_CONSOLE_NO_ANSI + "=true").equals(options[2]);
61 final boolean hideAnsi = noConsoleNoAnsi && System.console() == null;
62 return new StyleConverter(formatters, style, hideAnsi);
63 }
64
65 private final List<PatternFormatter> patternFormatters;
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67 private final boolean noAnsi;
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69 private final String style;
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71 private final String defaultStyle;
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83 private StyleConverter(final List<PatternFormatter> patternFormatters, final String style, boolean noAnsi) {
84 super("style", "style");
85 this.patternFormatters = patternFormatters;
86 this.style = style;
87 this.defaultStyle = AnsiEscape.getDefaultStyle();
88 this.noAnsi = noAnsi;
89 }
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94 @Override
95 public void format(final LogEvent event, final StringBuilder toAppendTo) {
96 final StringBuilder buf = new StringBuilder();
97 for (final PatternFormatter formatter : patternFormatters) {
98 formatter.format(event, buf);
99 }
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101 if (buf.length() > 0) {
102 if (noAnsi) {
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104 toAppendTo.append(buf.toString());
105 } else {
106 toAppendTo.append(style).append(buf.toString()).append(defaultStyle);
107 }
108 }
109 }
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111 @Override
112 public boolean handlesThrowable() {
113 for (final PatternFormatter formatter : patternFormatters) {
114 if (formatter.handlesThrowable()) {
115 return true;
116 }
117 }
118 return false;
119 }
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126 @Override
127 public String toString() {
128 StringBuilder sb = new StringBuilder();
129 sb.append(super.toString());
130 sb.append("[style=");
131 sb.append(style);
132 sb.append(", defaultStyle=");
133 sb.append(defaultStyle);
134 sb.append(", patternFormatters=");
135 sb.append(patternFormatters);
136 sb.append(", noAnsi=");
137 sb.append(noAnsi);
138 sb.append("]");
139 return sb.toString();
140 }
141
142 }