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Make slf4j optional, fall back on j.u.logging
In order to avoid the hard dependency on slf4j, this patch abstracts the Logger interface and LoggerFactory factory to fall back on a java.util.logging-based implementation if slf4j is not present. Fixes xerial#1094
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| package org.sqlite.util; | ||
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| /** A simple internal Logger interface. */ | ||
| public interface Logger { | ||
| boolean isTraceEnabled(); | ||
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| void trace(String format, Object o1, Object o2); | ||
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| void info(String format, Object o1, Object o2); | ||
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| void warn(String msg); | ||
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| void error(String message, Throwable t); | ||
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| void error(String format, Object o1, Throwable t); | ||
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| void error(String format, Object o1, Object o2, Throwable t); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package org.sqlite.util; | ||
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| import java.text.MessageFormat; | ||
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| /** | ||
| * A factory for {@link Logger} instances that uses SLF4J if present, falling back on a | ||
| * java.util.logging implementation otherwise. | ||
| */ | ||
| public class LoggerFactory { | ||
| static final boolean USE_SLF4J; | ||
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| static { | ||
| boolean useSLF4J; | ||
| try { | ||
| Class.forName("org.slf4j.Logger"); | ||
| useSLF4J = true; | ||
| } catch (Exception e) { | ||
| useSLF4J = false; | ||
| } | ||
| USE_SLF4J = useSLF4J; | ||
| } | ||
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| /** | ||
| * Get a {@link Logger} instance for the given host class. | ||
| * | ||
| * @param hostClass the host class from which log messages will be issued | ||
| * @return a Logger | ||
| */ | ||
| public static Logger getLogger(Class<?> hostClass) { | ||
| if (USE_SLF4J) { | ||
| return new SLF4JLogger(hostClass); | ||
| } | ||
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| return new JDKLogger(hostClass); | ||
| } | ||
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| private static class JDKLogger implements Logger { | ||
| final java.util.logging.Logger logger; | ||
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| public JDKLogger(Class<?> hostClass) { | ||
| logger = java.util.logging.Logger.getLogger(hostClass.getCanonicalName()); | ||
| } | ||
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| @Override | ||
| public boolean isTraceEnabled() { | ||
| return logger.isLoggable(java.util.logging.Level.FINEST); | ||
| } | ||
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| @Override | ||
| public void trace(String format, Object o1, Object o2) { | ||
| if (logger.isLoggable(java.util.logging.Level.FINEST)) { | ||
| logger.log(java.util.logging.Level.FINEST, MessageFormat.format(format, o1, o2)); | ||
| } | ||
| } | ||
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| @Override | ||
| public void info(String format, Object o1, Object o2) { | ||
| if (logger.isLoggable(java.util.logging.Level.INFO)) { | ||
| logger.log(java.util.logging.Level.INFO, MessageFormat.format(format, o1, o2)); | ||
| } | ||
| } | ||
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| @Override | ||
| public void warn(String msg) { | ||
| logger.log(java.util.logging.Level.WARNING, msg); | ||
| } | ||
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| @Override | ||
| public void error(String message, Throwable t) { | ||
| logger.log(java.util.logging.Level.SEVERE, message, t); | ||
| } | ||
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| @Override | ||
| public void error(String format, Object o1, Throwable t) { | ||
| if (logger.isLoggable(java.util.logging.Level.SEVERE)) { | ||
| logger.log(java.util.logging.Level.SEVERE, MessageFormat.format(format, o1), t); | ||
| } | ||
| } | ||
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| @Override | ||
| public void error(String format, Object o1, Object o2, Throwable t) { | ||
| if (logger.isLoggable(java.util.logging.Level.SEVERE)) { | ||
| logger.log(java.util.logging.Level.SEVERE, MessageFormat.format(format, o1, o2), t); | ||
| } | ||
| } | ||
| } | ||
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| private static class SLF4JLogger implements Logger { | ||
| final org.slf4j.Logger logger; | ||
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| SLF4JLogger(Class<?> hostClass) { | ||
| logger = org.slf4j.LoggerFactory.getLogger(hostClass); | ||
| } | ||
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| @Override | ||
| public boolean isTraceEnabled() { | ||
| return logger.isTraceEnabled(); | ||
| } | ||
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| @Override | ||
| public void trace(String format, Object o1, Object o2) { | ||
| logger.trace(format, o1, o2); | ||
| } | ||
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| @Override | ||
| public void info(String format, Object o1, Object o2) { | ||
| logger.info(format, o1, o2); | ||
| } | ||
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| @Override | ||
| public void warn(String msg) { | ||
| logger.warn(msg); | ||
| } | ||
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| @Override | ||
| public void error(String message, Throwable t) { | ||
| logger.error(message, t); | ||
| } | ||
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| @Override | ||
| public void error(String format, Object o1, Throwable t) { | ||
| logger.error(format, o1, t); | ||
| } | ||
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| @Override | ||
| public void error(String format, Object o1, Object o2, Throwable t) { | ||
| logger.error(format, o1, o2, t); | ||
| } | ||
| } | ||
| } |
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