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121 changes: 121 additions & 0 deletions
121
slf4j-api/src/main/java/org/slf4j/helpers/Reporter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| package org.slf4j.helpers; | ||
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| import java.io.PrintStream; | ||
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| /** | ||
| * An internally used class for reporting messages generated by SLF4J itself during initialization | ||
| * | ||
| * @since 2.0.10 | ||
| */ | ||
| public class Reporter { | ||
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| /** | ||
| * this class is used internally by Reporter | ||
| */ | ||
| private enum Level { | ||
| INFO(1), WARN(2), ERROR(3); | ||
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| int levelInt; | ||
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| private Level(int levelInt) { | ||
| this.levelInt = levelInt; | ||
| } | ||
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| private int getLevelInt() { | ||
| return levelInt; | ||
| } | ||
| } | ||
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| private enum TargetChoice { | ||
| Stderr, Stdout; | ||
| } | ||
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| static final String SLF4J_INFO_PREFIX = "SLF4J(I): "; | ||
| static final String SLF4J_WARN_PREFIX = "SLF4J(W): "; | ||
| static final String SLF4J_ERROR_PREFIX = "SLF4J(E): "; | ||
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| /** | ||
| * Acceptable values are s "System.out", "stdout", "sysout", "System.err", "stderr" and "syserr". | ||
| */ | ||
| public static final String SLF4J_REPORT_TARGET_KEY = "slf4j.reportStream"; | ||
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| public static final String SLF4J_VERBOSITY_KEY = "slf4j.verbosity"; | ||
| static private final String[] SYSOUT_KEYS = {"System.out", "stdout", "sysout"}; | ||
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| static private final TargetChoice TARGET_CHOICE = initTargetChoice(); | ||
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| static private final Level VERBOSITY = initVerbosity(); | ||
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| static private TargetChoice initTargetChoice() { | ||
| String reportStreamStr = System.getProperty(SLF4J_REPORT_TARGET_KEY); | ||
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| if(reportStreamStr == null || reportStreamStr.isEmpty()) { | ||
| return TargetChoice.Stderr; | ||
| } | ||
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| for(String s : SYSOUT_KEYS) { | ||
| if(s.equalsIgnoreCase(reportStreamStr)) | ||
| return TargetChoice.Stdout; | ||
| } | ||
| return TargetChoice.Stderr; | ||
| } | ||
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| static private Level initVerbosity() { | ||
| String verbosityStr = System.getProperty(SLF4J_VERBOSITY_KEY); | ||
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| if(verbosityStr == null || verbosityStr.isEmpty()) { | ||
| return Level.INFO; | ||
| } | ||
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| if(verbosityStr.equalsIgnoreCase("ERROR")) { | ||
| return Level.ERROR; | ||
| } | ||
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| if(verbosityStr.equalsIgnoreCase("WARN")) { | ||
| return Level.WARN; | ||
| } | ||
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| return Level.INFO; | ||
| } | ||
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| static boolean isEnabledFor(Level level) { | ||
| return (level.levelInt >= VERBOSITY.levelInt); | ||
| } | ||
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| static private PrintStream getTarget() { | ||
| switch(TARGET_CHOICE) { | ||
| case Stdout: return System.out; | ||
| case Stderr: | ||
| default: return System.err; | ||
| } | ||
| } | ||
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| public static void info(String msg) { | ||
| if(isEnabledFor(Level.INFO)) { | ||
| getTarget().println(SLF4J_INFO_PREFIX + msg); | ||
| } | ||
| } | ||
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| static final public void warn(String msg) { | ||
| if(isEnabledFor(Level.WARN)) { | ||
| getTarget().println(SLF4J_WARN_PREFIX + msg); | ||
| } | ||
| } | ||
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| static final public void error(String msg, Throwable t) { | ||
| // error cannot be disabled | ||
| getTarget().println(SLF4J_ERROR_PREFIX + msg); | ||
| getTarget().println(SLF4J_ERROR_PREFIX + "Reported exception:"); | ||
| t.printStackTrace( getTarget()); | ||
| } | ||
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| static final public void error(String msg) { | ||
| // error cannot be disabled | ||
| getTarget().println(SLF4J_ERROR_PREFIX + msg); | ||
| } | ||
| } |
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